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Filename : jquery.steps.js
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/*! 

 * jQuery Steps v1.1.0 - 09/04/2014

 * Copyright (c) 2014 Rafael Staib (http://www.jquery-steps.com)

 * Licensed under MIT http://www.opensource.org/licenses/MIT

 */

;(function ($, undefined)

{

$.fn.extend({

    _aria: function (name, value)

    {

        return this.attr("aria-" + name, value);

    },



    _removeAria: function (name)

    {

        return this.removeAttr("aria-" + name);

    },



    _enableAria: function (enable)

    {

        return (enable == null || enable) ? 

            this.removeClass("disabled")._aria("disabled", "false") : 

            this.addClass("disabled")._aria("disabled", "true");

    },



    _showAria: function (show)

    {

        return (show == null || show) ? 

            this.show()._aria("hidden", "false") : 

            this.hide()._aria("hidden", "true");

    },



    _selectAria: function (select)

    {

        return (select == null || select) ? 

            this.addClass("current")._aria("selected", "true") : 

            this.removeClass("current")._aria("selected", "false");

    },



    _id: function (id)

    {

        return (id) ? this.attr("id", id) : this.attr("id");

    }

});



if (!String.prototype.format)

{

    String.prototype.format = function()

    {

        var args = (arguments.length === 1 && $.isArray(arguments[0])) ? arguments[0] : arguments;

        var formattedString = this;

        for (var i = 0; i < args.length; i++)

        {

            var pattern = new RegExp("\\{" + i + "\\}", "gm");

            formattedString = formattedString.replace(pattern, args[i]);

        }

        return formattedString;

    };

}



/**

 * A global unique id count.

 *

 * @static

 * @private

 * @property _uniqueId

 * @type Integer

 **/

var _uniqueId = 0;



/**

 * The plugin prefix for cookies.

 *

 * @final

 * @private

 * @property _cookiePrefix

 * @type String

 **/

var _cookiePrefix = "jQu3ry_5teps_St@te_";



/**

 * Suffix for the unique tab id.

 *

 * @final

 * @private

 * @property _tabSuffix

 * @type String

 * @since 0.9.7

 **/

var _tabSuffix = "-t-";



/**

 * Suffix for the unique tabpanel id.

 *

 * @final

 * @private

 * @property _tabpanelSuffix

 * @type String

 * @since 0.9.7

 **/

var _tabpanelSuffix = "-p-";



/**

 * Suffix for the unique title id.

 *

 * @final

 * @private

 * @property _titleSuffix

 * @type String

 * @since 0.9.7

 **/

var _titleSuffix = "-h-";



/**

 * An error message for an "index out of range" error.

 *

 * @final

 * @private

 * @property _indexOutOfRangeErrorMessage

 * @type String

 **/

var _indexOutOfRangeErrorMessage = "Index out of range.";



/**

 * An error message for an "missing corresponding element" error.

 *

 * @final

 * @private

 * @property _missingCorrespondingElementErrorMessage

 * @type String

 **/

var _missingCorrespondingElementErrorMessage = "One or more corresponding step {0} are missing.";



/**

 * Adds a step to the cache.

 *

 * @static

 * @private

 * @method addStepToCache

 * @param wizard {Object} A jQuery wizard object

 * @param step {Object} The step object to add

 **/

function addStepToCache(wizard, step)

{

    getSteps(wizard).push(step);

}



function analyzeData(wizard, options, state)

{

    var stepTitles = wizard.children(options.headerTag),

        stepContents = wizard.children(options.bodyTag);



    // Validate content

    if (stepTitles.length > stepContents.length)

    {

        throwError(_missingCorrespondingElementErrorMessage, "contents");

    }

    else if (stepTitles.length < stepContents.length)

    {

        throwError(_missingCorrespondingElementErrorMessage, "titles");

    }

        

    var startIndex = options.startIndex;



    state.stepCount = stepTitles.length;



    // Tries to load the saved state (step position)

    if (options.saveState && $.cookie)

    {

        var savedState = $.cookie(_cookiePrefix + getUniqueId(wizard));

        // Sets the saved position to the start index if not undefined or out of range 

        var savedIndex = parseInt(savedState, 0);

        if (!isNaN(savedIndex) && savedIndex < state.stepCount)

        {

            startIndex = savedIndex;

        }

    }



    state.currentIndex = startIndex;



    stepTitles.each(function (index)

    {

        var item = $(this), // item == header

            content = stepContents.eq(index),

            modeData = content.data("mode"),

            mode = (modeData == null) ? contentMode.html : getValidEnumValue(contentMode,

                (/^\s*$/.test(modeData) || isNaN(modeData)) ? modeData : parseInt(modeData, 0)),

            contentUrl = (mode === contentMode.html || content.data("url") === undefined) ?

                "" : content.data("url"),

            contentLoaded = (mode !== contentMode.html && content.data("loaded") === "1"),

            step = $.extend({}, stepModel, {

                title: item.html(),

                content: (mode === contentMode.html) ? content.html() : "",

                contentUrl: contentUrl,

                contentMode: mode,

                contentLoaded: contentLoaded

            });



        addStepToCache(wizard, step);

    });

}



/**

 * Triggers the onCanceled event.

 *

 * @static

 * @private

 * @method cancel

 * @param wizard {Object} The jQuery wizard object

 **/

function cancel(wizard)

{

    wizard.triggerHandler("canceled");

}



function decreaseCurrentIndexBy(state, decreaseBy)

{

    return state.currentIndex - decreaseBy;

}



/**

 * Removes the control functionality completely and transforms the current state to the initial HTML structure.

 *

 * @static

 * @private

 * @method destroy

 * @param wizard {Object} A jQuery wizard object

 **/

function destroy(wizard, options)

{

    var eventNamespace = getEventNamespace(wizard);



    // Remove virtual data objects from the wizard

    wizard.unbind(eventNamespace).removeData("uid").removeData("options")

        .removeData("state").removeData("steps").removeData("eventNamespace")

        .find(".actions a").unbind(eventNamespace);



    // Remove attributes and CSS classes from the wizard

    wizard.removeClass(options.clearFixCssClass + " vertical");



    var contents = wizard.find(".content > *");



    // Remove virtual data objects from panels and their titles

    contents.removeData("loaded").removeData("mode").removeData("url");



    // Remove attributes, CSS classes and reset inline styles on all panels and their titles

    contents.removeAttr("id").removeAttr("role").removeAttr("tabindex")

        .removeAttr("class").removeAttr("style")._removeAria("labelledby")

        ._removeAria("hidden");



    // Empty panels if the mode is set to 'async' or 'iframe'

    wizard.find(".content > [data-mode='async'],.content > [data-mode='iframe']").empty();



    var wizardSubstitute = $("<{0} class=\"{1}\"></{0}>".format(wizard.get(0).tagName, wizard.attr("class")));



    var wizardId = wizard._id();

    if (wizardId != null && wizardId !== "")

    {

        wizardSubstitute._id(wizardId);

    }



    wizardSubstitute.html(wizard.find(".content").html());

    wizard.after(wizardSubstitute);

    wizard.remove();



    return wizardSubstitute;

}



/**

 * Triggers the onFinishing and onFinished event.

 *

 * @static

 * @private

 * @method finishStep

 * @param wizard {Object} The jQuery wizard object

 * @param state {Object} The state container of the current wizard

 **/

function finishStep(wizard, state)

{

    var currentStep = wizard.find(".steps li").eq(state.currentIndex);



    if (wizard.triggerHandler("finishing", [state.currentIndex]))

    {

        currentStep.addClass("done").removeClass("error");

        wizard.triggerHandler("finished", [state.currentIndex]);

    }

    else

    {

        currentStep.addClass("error");

    }

}



/**

 * Gets or creates if not exist an unique event namespace for the given wizard instance.

 *

 * @static

 * @private

 * @method getEventNamespace

 * @param wizard {Object} A jQuery wizard object

 * @return {String} Returns the unique event namespace for the given wizard

 */

function getEventNamespace(wizard)

{

    var eventNamespace = wizard.data("eventNamespace");



    if (eventNamespace == null)

    {

        eventNamespace = "." + getUniqueId(wizard);

        wizard.data("eventNamespace", eventNamespace);

    }



    return eventNamespace;

}



function getStepAnchor(wizard, index)

{

    var uniqueId = getUniqueId(wizard);



    return wizard.find("#" + uniqueId + _tabSuffix + index);

}



function getStepPanel(wizard, index)

{

    var uniqueId = getUniqueId(wizard);



    return wizard.find("#" + uniqueId + _tabpanelSuffix + index);

}



function getStepTitle(wizard, index)

{

    var uniqueId = getUniqueId(wizard);



    return wizard.find("#" + uniqueId + _titleSuffix + index);

}



function getOptions(wizard)

{

    return wizard.data("options");

}



function getState(wizard)

{

    return wizard.data("state");

}



function getSteps(wizard)

{

    return wizard.data("steps");

}



/**

 * Gets a specific step object by index.

 *

 * @static

 * @private

 * @method getStep

 * @param index {Integer} An integer that belongs to the position of a step

 * @return {Object} A specific step object

 **/

function getStep(wizard, index)

{

    var steps = getSteps(wizard);



    if (index < 0 || index >= steps.length)

    {

        throwError(_indexOutOfRangeErrorMessage);

    }



    return steps[index];

}



/**

 * Gets or creates if not exist an unique id from the given wizard instance.

 *

 * @static

 * @private

 * @method getUniqueId

 * @param wizard {Object} A jQuery wizard object

 * @return {String} Returns the unique id for the given wizard

 */

function getUniqueId(wizard)

{

    var uniqueId = wizard.data("uid");



    if (uniqueId == null)

    {

        uniqueId = wizard._id();

        if (uniqueId == null)

        {

            uniqueId = "steps-uid-".concat(_uniqueId);

            wizard._id(uniqueId);

        }



        _uniqueId++;

        wizard.data("uid", uniqueId);

    }



    return uniqueId;

}



/**

 * Gets a valid enum value by checking a specific enum key or value.

 * 

 * @static

 * @private

 * @method getValidEnumValue

 * @param enumType {Object} Type of enum

 * @param keyOrValue {Object} Key as `String` or value as `Integer` to check for

 */

function getValidEnumValue(enumType, keyOrValue)

{

    validateArgument("enumType", enumType);

    validateArgument("keyOrValue", keyOrValue);



    // Is key

    if (typeof keyOrValue === "string")

    {

        var value = enumType[keyOrValue];

        if (value === undefined)

        {

            throwError("The enum key '{0}' does not exist.", keyOrValue);

        }



        return value;

    }

    // Is value

    else if (typeof keyOrValue === "number")

    {

        for (var key in enumType)

        {

            if (enumType[key] === keyOrValue)

            {

                return keyOrValue;

            }

        }



        throwError("Invalid enum value '{0}'.", keyOrValue);

    }

    // Type is not supported

    else

    {

        throwError("Invalid key or value type.");

    }

}



/**

 * Routes to the next step.

 *

 * @static

 * @private

 * @method goToNextStep

 * @param wizard {Object} The jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @return {Boolean} Indicates whether the action executed

 **/

function goToNextStep(wizard, options, state)

{

    return paginationClick(wizard, options, state, increaseCurrentIndexBy(state, 1));

}



/**

 * Routes to the previous step.

 *

 * @static

 * @private

 * @method goToPreviousStep

 * @param wizard {Object} The jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @return {Boolean} Indicates whether the action executed

 **/

function goToPreviousStep(wizard, options, state)

{

    return paginationClick(wizard, options, state, decreaseCurrentIndexBy(state, 1));

}



/**

 * Routes to a specific step by a given index.

 *

 * @static

 * @private

 * @method goToStep

 * @param wizard {Object} The jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param index {Integer} The position (zero-based) to route to

 * @return {Boolean} Indicates whether the action succeeded or failed

 **/

function goToStep(wizard, options, state, index)

{

    if (index < 0 || index >= state.stepCount)

    {

        throwError(_indexOutOfRangeErrorMessage);

    }



    if (options.forceMoveForward && index < state.currentIndex)

    {

        return;

    }



    var oldIndex = state.currentIndex;

    if (wizard.triggerHandler("stepChanging", [state.currentIndex, index]))

    {

        // Save new state

        state.currentIndex = index;

        saveCurrentStateToCookie(wizard, options, state);



        // Change visualisation

        refreshStepNavigation(wizard, options, state, oldIndex);

        refreshPagination(wizard, options, state);

        loadAsyncContent(wizard, options, state);

        startTransitionEffect(wizard, options, state, index, oldIndex, function()

        {

            wizard.triggerHandler("stepChanged", [index, oldIndex]);

        });

    }

    else

    {

        wizard.find(".steps li").eq(oldIndex).addClass("error");

    }



    return true;

}



function increaseCurrentIndexBy(state, increaseBy)

{

    return state.currentIndex + increaseBy;

}



/**

 * Initializes the component.

 *

 * @static

 * @private

 * @method initialize

 * @param options {Object} The component settings

 **/

function initialize(options)

{

    /*jshint -W040 */

    var opts = $.extend(true, {}, defaults, options);



    return this.each(function ()

    {

        var wizard = $(this);

        var state = {

            currentIndex: opts.startIndex,

            currentStep: null,

            stepCount: 0,

            transitionElement: null

        };



        // Create data container

        wizard.data("options", opts);

        wizard.data("state", state);

        wizard.data("steps", []);



        analyzeData(wizard, opts, state);

        render(wizard, opts, state);

        registerEvents(wizard, opts);



        // Trigger focus

        if (opts.autoFocus && _uniqueId === 0)

        {

            getStepAnchor(wizard, opts.startIndex).focus();

        }



        wizard.triggerHandler("init", [opts.startIndex]);

    });

}



/**

 * Inserts a new step to a specific position.

 *

 * @static

 * @private

 * @method insertStep

 * @param wizard {Object} The jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param index {Integer} The position (zero-based) to add

 * @param step {Object} The step object to add

 * @example

 *     $("#wizard").steps().insert(0, {

 *         title: "Title",

 *         content: "", // optional

 *         contentMode: "async", // optional

 *         contentUrl: "/Content/Step/1" // optional

 *     });

 * @chainable

 **/

function insertStep(wizard, options, state, index, step)

{

    if (index < 0 || index > state.stepCount)

    {

        throwError(_indexOutOfRangeErrorMessage);

    }



    // TODO: Validate step object



    // Change data

    step = $.extend({}, stepModel, step);

    insertStepToCache(wizard, index, step);

    if (state.currentIndex !== state.stepCount && state.currentIndex >= index)

    {

        state.currentIndex++;

        saveCurrentStateToCookie(wizard, options, state);

    }

    state.stepCount++;



    var contentContainer = wizard.find(".content"),

        header = $("<{0}>{1}</{0}>".format(options.headerTag, step.title)),

        body = $("<{0}></{0}>".format(options.bodyTag));



    if (step.contentMode == null || step.contentMode === contentMode.html)

    {

        body.html(step.content);

    }



    if (index === 0)

    {

        contentContainer.prepend(body).prepend(header);

    }

    else

    {

        getStepPanel(wizard, (index - 1)).after(body).after(header);

    }



    renderBody(wizard, state, body, index);

    renderTitle(wizard, options, state, header, index);

    refreshSteps(wizard, options, state, index);

    if (index === state.currentIndex)

    {

        refreshStepNavigation(wizard, options, state);

    }

    refreshPagination(wizard, options, state);



    return wizard;

}



/**

 * Inserts a step object to the cache at a specific position.

 *

 * @static

 * @private

 * @method insertStepToCache

 * @param wizard {Object} A jQuery wizard object

 * @param index {Integer} The position (zero-based) to add

 * @param step {Object} The step object to add

 **/

function insertStepToCache(wizard, index, step)

{

    getSteps(wizard).splice(index, 0, step);

}



/**

 * Handles the keyup DOM event for pagination.

 *

 * @static

 * @private

 * @event keyup

 * @param event {Object} An event object

 */

function keyUpHandler(event)

{

    var wizard = $(this),

        options = getOptions(wizard),

        state = getState(wizard);



    if (options.suppressPaginationOnFocus && wizard.find(":focus").is(":input"))

    {

        event.preventDefault();

        return false;

    }



    var keyCodes = { left: 37, right: 39 };

    if (event.keyCode === keyCodes.left)

    {

        event.preventDefault();

        goToPreviousStep(wizard, options, state);

    }

    else if (event.keyCode === keyCodes.right)

    {

        event.preventDefault();

        goToNextStep(wizard, options, state);

    }

}



/**

 * Loads and includes async content.

 *

 * @static

 * @private

 * @method loadAsyncContent

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 */

function loadAsyncContent(wizard, options, state)

{

    if (state.stepCount > 0)

    {

        var currentIndex = state.currentIndex,

            currentStep = getStep(wizard, currentIndex);



        if (!options.enableContentCache || !currentStep.contentLoaded)

        {

            switch (getValidEnumValue(contentMode, currentStep.contentMode))

            {

                case contentMode.iframe:

                    wizard.find(".content > .body").eq(state.currentIndex).empty()

                        .html("<iframe src=\"" + currentStep.contentUrl + "\" frameborder=\"0\" scrolling=\"no\" />")

                        .data("loaded", "1");

                    break;



                case contentMode.async:

                    var currentStepContent = getStepPanel(wizard, currentIndex)._aria("busy", "true")

                        .empty().append(renderTemplate(options.loadingTemplate, { text: options.labels.loading }));



                    $.ajax({ url: currentStep.contentUrl, cache: false }).done(function (data)

                    {

                        currentStepContent.empty().html(data)._aria("busy", "false").data("loaded", "1");

                        wizard.triggerHandler("contentLoaded", [currentIndex]);

                    });

                    break;

            }

        }

    }

}



/**

 * Fires the action next or previous click event.

 *

 * @static

 * @private

 * @method paginationClick

 * @param wizard {Object} The jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param index {Integer} The position (zero-based) to route to

 * @return {Boolean} Indicates whether the event fired successfully or not

 **/

function paginationClick(wizard, options, state, index)

{

    var oldIndex = state.currentIndex;



    if (index >= 0 && index < state.stepCount && !(options.forceMoveForward && index < state.currentIndex))

    {

        var anchor = getStepAnchor(wizard, index),

            parent = anchor.parent(),

            isDisabled = parent.hasClass("disabled");



        // Enable the step to make the anchor clickable!

        parent._enableAria();

        anchor.click();



        // An error occured

        if (oldIndex === state.currentIndex && isDisabled)

        {

            // Disable the step again if current index has not changed; prevents click action.

            parent._enableAria(false);

            return false;

        }



        return true;

    }



    return false;

}



/**

 * Fires when a pagination click happens.

 *

 * @static

 * @private

 * @event click

 * @param event {Object} An event object

 */

function paginationClickHandler(event)

{

    event.preventDefault();



    var anchor = $(this),

        wizard = anchor.parent().parent().parent().parent(),

        options = getOptions(wizard),

        state = getState(wizard),

        href = anchor.attr("href");



    switch (href.substring(href.lastIndexOf("#") + 1))

    {

        case "cancel":

            cancel(wizard);

            break;



        case "finish":

            finishStep(wizard, state);

            break;



        case "next":

            goToNextStep(wizard, options, state);

            break;



        case "previous":

            goToPreviousStep(wizard, options, state);

            break;

    }

}



/**

 * Refreshs the visualization state for the entire pagination.

 *

 * @static

 * @private

 * @method refreshPagination

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 */

function refreshPagination(wizard, options, state)

{

    if (options.enablePagination)

    {

        var finish = wizard.find(".actions a[href$='#finish']").parent(),

            next = wizard.find(".actions a[href$='#next']").parent();



        if (!options.forceMoveForward)

        {

            var previous = wizard.find(".actions a[href$='#previous']").parent();

            previous._enableAria(state.currentIndex > 0);

        }



        if (options.enableFinishButton && options.showFinishButtonAlways)

        {

            finish._enableAria(state.stepCount > 0);

            next._enableAria(state.stepCount > 1 && state.stepCount > (state.currentIndex + 1));

        }

        else

        {

            finish._showAria(options.enableFinishButton && state.stepCount === (state.currentIndex + 1));

            next._showAria(state.stepCount === 0 || state.stepCount > (state.currentIndex + 1)).

                _enableAria(state.stepCount > (state.currentIndex + 1) || !options.enableFinishButton);

        }

    }

}



/**

 * Refreshs the visualization state for the step navigation (tabs).

 *

 * @static

 * @private

 * @method refreshStepNavigation

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param [oldIndex] {Integer} The index of the prior step

 */

function refreshStepNavigation(wizard, options, state, oldIndex)

{

    var currentOrNewStepAnchor = getStepAnchor(wizard, state.currentIndex),

        currentInfo = $("<span class=\"current-info audible\">" + options.labels.current + " </span>"),

        stepTitles = wizard.find(".content > .title");



    if (oldIndex != null)

    {

        var oldStepAnchor = getStepAnchor(wizard, oldIndex);

        oldStepAnchor.parent().addClass("done").removeClass("error")._selectAria(false);

        stepTitles.eq(oldIndex).removeClass("current").next(".body").removeClass("current");

        currentInfo = oldStepAnchor.find(".current-info");

        currentOrNewStepAnchor.focus();

    }



    currentOrNewStepAnchor.prepend(currentInfo).parent()._selectAria().removeClass("done")._enableAria();

    stepTitles.eq(state.currentIndex).addClass("current").next(".body").addClass("current");

}



/**

 * Refreshes step buttons and their related titles beyond a certain position.

 *

 * @static

 * @private

 * @method refreshSteps

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param index {Integer} The start point for refreshing ids

 */

function refreshSteps(wizard, options, state, index)

{

    var uniqueId = getUniqueId(wizard);



    for (var i = index; i < state.stepCount; i++)

    {

        var uniqueStepId = uniqueId + _tabSuffix + i,

            uniqueBodyId = uniqueId + _tabpanelSuffix + i,

            uniqueHeaderId = uniqueId + _titleSuffix + i,

            title = wizard.find(".title").eq(i)._id(uniqueHeaderId);



        wizard.find(".steps a").eq(i)._id(uniqueStepId)

            ._aria("controls", uniqueBodyId).attr("href", "#" + uniqueHeaderId)

            .html(renderTemplate(options.titleTemplate, { index: i + 1, title: title.html() }));

        wizard.find(".body").eq(i)._id(uniqueBodyId)

            ._aria("labelledby", uniqueHeaderId);

    }

}



function registerEvents(wizard, options)

{

    var eventNamespace = getEventNamespace(wizard);



    wizard.bind("canceled" + eventNamespace, options.onCanceled);

    wizard.bind("contentLoaded" + eventNamespace, options.onContentLoaded);

    wizard.bind("finishing" + eventNamespace, options.onFinishing);

    wizard.bind("finished" + eventNamespace, options.onFinished);

    wizard.bind("init" + eventNamespace, options.onInit);

    wizard.bind("stepChanging" + eventNamespace, options.onStepChanging);

    wizard.bind("stepChanged" + eventNamespace, options.onStepChanged);



    if (options.enableKeyNavigation)

    {

        wizard.bind("keyup" + eventNamespace, keyUpHandler);

    }



    wizard.find(".actions a").bind("click" + eventNamespace, paginationClickHandler);

}



/**

 * Removes a specific step by an given index.

 *

 * @static

 * @private

 * @method removeStep

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param index {Integer} The position (zero-based) of the step to remove

 * @return Indecates whether the item is removed.

 **/

function removeStep(wizard, options, state, index)

{

    // Index out of range and try deleting current item will return false.

    if (index < 0 || index >= state.stepCount || state.currentIndex === index)

    {

        return false;

    }



    // Change data

    removeStepFromCache(wizard, index);

    if (state.currentIndex > index)

    {

        state.currentIndex--;

        saveCurrentStateToCookie(wizard, options, state);

    }

    state.stepCount--;



    getStepTitle(wizard, index).remove();

    getStepPanel(wizard, index).remove();

    getStepAnchor(wizard, index).parent().remove();



    // Set the "first" class to the new first step button 

    if (index === 0)

    {

        wizard.find(".steps li").first().addClass("first");

    }



    // Set the "last" class to the new last step button 

    if (index === state.stepCount)

    {

        wizard.find(".steps li").eq(index).addClass("last");

    }



    refreshSteps(wizard, options, state, index);

    refreshPagination(wizard, options, state);



    return true;

}



function removeStepFromCache(wizard, index)

{

    getSteps(wizard).splice(index, 1);

}



/**

 * Transforms the base html structure to a more sensible html structure.

 *

 * @static

 * @private

 * @method render

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 **/

function render(wizard, options, state)

{

    // Create a content wrapper and copy HTML from the intial wizard structure

    var wrapperTemplate = "<{0} class=\"{1}\">{2}</{0}>",

        orientation = getValidEnumValue(stepsOrientation, options.stepsOrientation),

        verticalCssClass = (orientation === stepsOrientation.vertical) ? " vertical" : "",

        contentWrapper = $(wrapperTemplate.format(options.contentContainerTag, "content " + options.clearFixCssClass, wizard.html())),

        stepsWrapper = $(wrapperTemplate.format(options.stepsContainerTag, "steps " + options.clearFixCssClass, "<ul role=\"tablist\"></ul>")),

        stepTitles = contentWrapper.children(options.headerTag),

        stepContents = contentWrapper.children(options.bodyTag);



    // Transform the wizard wrapper and remove the inner HTML

    wizard.attr("role", "application").empty().append(stepsWrapper).append(contentWrapper)

        .addClass(options.cssClass + " " + options.clearFixCssClass + verticalCssClass);



    // Add WIA-ARIA support

    stepContents.each(function (index)

    {

        renderBody(wizard, state, $(this), index);

    });



    stepTitles.each(function (index)

    {

        renderTitle(wizard, options, state, $(this), index);

    });



    refreshStepNavigation(wizard, options, state);

    renderPagination(wizard, options, state);

}



/**

 * Transforms the body to a proper tabpanel.

 *

 * @static

 * @private

 * @method renderBody

 * @param wizard {Object} A jQuery wizard object

 * @param body {Object} A jQuery body object

 * @param index {Integer} The position of the body

 */

function renderBody(wizard, state, body, index)

{

    var uniqueId = getUniqueId(wizard),

        uniqueBodyId = uniqueId + _tabpanelSuffix + index,

        uniqueHeaderId = uniqueId + _titleSuffix + index;



    body._id(uniqueBodyId).attr("role", "tabpanel")._aria("labelledby", uniqueHeaderId)

        .addClass("body")._showAria(state.currentIndex === index);

}



/**

 * Renders a pagination if enabled.

 *

 * @static

 * @private

 * @method renderPagination

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 */

function renderPagination(wizard, options, state)

{

    if (options.enablePagination)

    {

        var pagination = "<{0} class=\"actions {1}\"><ul role=\"menu\" aria-label=\"{2}\">{3}</ul></{0}>",

            buttonTemplate = "<li><a href=\"#{0}\" role=\"menuitem\">{1}</a></li>",

            buttons = "";



        if (!options.forceMoveForward)

        {

            buttons += buttonTemplate.format("previous", options.labels.previous);

        }



        buttons += buttonTemplate.format("next", options.labels.next);



        if (options.enableFinishButton)

        {

            buttons += buttonTemplate.format("finish", options.labels.finish);

        }



        if (options.enableCancelButton)

        {

            buttons += buttonTemplate.format("cancel", options.labels.cancel);

        }



        wizard.append(pagination.format(options.actionContainerTag, options.clearFixCssClass,

            options.labels.pagination, buttons));



        refreshPagination(wizard, options, state);

        loadAsyncContent(wizard, options, state);

    }

}



/**

 * Renders a template and replaces all placeholder.

 *

 * @static

 * @private

 * @method renderTemplate

 * @param template {String} A template

 * @param substitutes {Object} A list of substitute

 * @return {String} The rendered template

 */

function renderTemplate(template, substitutes)

{

    var matches = template.match(/#([a-z]*)#/gi);



    for (var i = 0; i < matches.length; i++)

    {

        var match = matches[i], 

            key = match.substring(1, match.length - 1);



        if (substitutes[key] === undefined)

        {

            throwError("The key '{0}' does not exist in the substitute collection!", key);

        }



        template = template.replace(match, substitutes[key]);

    }



    return template;

}



/**

 * Transforms the title to a step item button.

 *

 * @static

 * @private

 * @method renderTitle

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 * @param header {Object} A jQuery header object

 * @param index {Integer} The position of the header

 */

function renderTitle(wizard, options, state, header, index)

{

    var uniqueId = getUniqueId(wizard),

        uniqueStepId = uniqueId + _tabSuffix + index,

        uniqueBodyId = uniqueId + _tabpanelSuffix + index,

        uniqueHeaderId = uniqueId + _titleSuffix + index,

        stepCollection = wizard.find(".steps > ul"),

        title = renderTemplate(options.titleTemplate, {

            index: index + 1,

            title: header.html()

        }),

        stepItem = $("<li role=\"tab\"><a id=\"" + uniqueStepId + "\" href=\"#" + uniqueHeaderId + 

            "\" aria-controls=\"" + uniqueBodyId + "\">" + title + "</a></li>");

        

    stepItem._enableAria(options.enableAllSteps || state.currentIndex > index);



    if (state.currentIndex > index)

    {

        stepItem.addClass("done");

    }



    header._id(uniqueHeaderId).attr("tabindex", "-1").addClass("title");



    if (index === 0)

    {

        stepCollection.prepend(stepItem);

    }

    else

    {

        stepCollection.find("li").eq(index - 1).after(stepItem);

    }



    // Set the "first" class to the new first step button

    if (index === 0)

    {

        stepCollection.find("li").removeClass("first").eq(index).addClass("first");

    }



    // Set the "last" class to the new last step button

    if (index === (state.stepCount - 1))

    {

        stepCollection.find("li").removeClass("last").eq(index).addClass("last");

    }



    // Register click event

    stepItem.children("a").bind("click" + getEventNamespace(wizard), stepClickHandler);

}



/**

 * Saves the current state to a cookie.

 *

 * @static

 * @private

 * @method saveCurrentStateToCookie

 * @param wizard {Object} A jQuery wizard object

 * @param options {Object} Settings of the current wizard

 * @param state {Object} The state container of the current wizard

 */

function saveCurrentStateToCookie(wizard, options, state)

{

    if (options.saveState && $.cookie)

    {

        $.cookie(_cookiePrefix + getUniqueId(wizard), state.currentIndex);

    }

}



function startTransitionEffect(wizard, options, state, index, oldIndex, doneCallback)

{

    var stepContents = wizard.find(".content > .body"),

        effect = getValidEnumValue(transitionEffect, options.transitionEffect),

        effectSpeed = options.transitionEffectSpeed,

        newStep = stepContents.eq(index),

        currentStep = stepContents.eq(oldIndex);



    switch (effect)

    {

        case transitionEffect.fade:

        case transitionEffect.slide:

            var hide = (effect === transitionEffect.fade) ? "fadeOut" : "slideUp",

                show = (effect === transitionEffect.fade) ? "fadeIn" : "slideDown";



            state.transitionElement = newStep;

            currentStep[hide](effectSpeed, function ()

            {

                var wizard = $(this)._showAria(false).parent().parent(),

                    state = getState(wizard);



                if (state.transitionElement)

                {

                    state.transitionElement[show](effectSpeed, function ()

                    {

                        $(this)._showAria();

                    }).promise().done(doneCallback);

                    state.transitionElement = null;

                }

            });

            break;



        case transitionEffect.slideLeft:

            var outerWidth = currentStep.outerWidth(true),

                posFadeOut = (index > oldIndex) ? -(outerWidth) : outerWidth,

                posFadeIn = (index > oldIndex) ? outerWidth : -(outerWidth);



            $.when(currentStep.animate({ left: posFadeOut }, effectSpeed, 

                    function () { $(this)._showAria(false); }),

                newStep.css("left", posFadeIn + "px")._showAria()

                    .animate({ left: 0 }, effectSpeed)).done(doneCallback);

            break;



        default:

            $.when(currentStep._showAria(false), newStep._showAria())

                .done(doneCallback);

            break;

    }

}



/**

 * Fires when a step click happens.

 *

 * @static

 * @private

 * @event click

 * @param event {Object} An event object

 */

function stepClickHandler(event)

{

    event.preventDefault();



    var anchor = $(this),

        wizard = anchor.parent().parent().parent().parent(),

        options = getOptions(wizard),

        state = getState(wizard),

        oldIndex = state.currentIndex;



    if (anchor.parent().is(":not(.disabled):not(.current)"))

    {

        var href = anchor.attr("href"),

            position = parseInt(href.substring(href.lastIndexOf("-") + 1), 0);



        goToStep(wizard, options, state, position);

    }



    // If nothing has changed

    if (oldIndex === state.currentIndex)

    {

        getStepAnchor(wizard, oldIndex).focus();

        return false;

    }

}



function throwError(message)

{

    if (arguments.length > 1)

    {

        message = message.format(Array.prototype.slice.call(arguments, 1));

    }



    throw new Error(message);

}



/**

 * Checks an argument for null or undefined and throws an error if one check applies.

 *

 * @static

 * @private

 * @method validateArgument

 * @param argumentName {String} The name of the given argument

 * @param argumentValue {Object} The argument itself

 */

function validateArgument(argumentName, argumentValue)

{

    if (argumentValue == null)

    {

        throwError("The argument '{0}' is null or undefined.", argumentName);

    }

}



/**

 * Represents a jQuery wizard plugin.

 *

 * @class steps

 * @constructor

 * @param [method={}] The name of the method as `String` or an JSON object for initialization

 * @param [params=]* {Array} Additional arguments for a method call

 * @chainable

 **/

$.fn.steps = function (method)

{

    if ($.fn.steps[method])

    {

        return $.fn.steps[method].apply(this, Array.prototype.slice.call(arguments, 1));

    }

    else if (typeof method === "object" || !method)

    {

        return initialize.apply(this, arguments);

    }

    else

    {

        $.error("Method " + method + " does not exist on jQuery.steps");

    }

};



/**

 * Adds a new step.

 *

 * @method add

 * @param step {Object} The step object to add

 * @chainable

 **/

$.fn.steps.add = function (step)

{

    var state = getState(this);

    return insertStep(this, getOptions(this), state, state.stepCount, step);

};



/**

 * Removes the control functionality completely and transforms the current state to the initial HTML structure.

 *

 * @method destroy

 * @chainable

 **/

$.fn.steps.destroy = function ()

{

    return destroy(this, getOptions(this));

};



/**

 * Triggers the onFinishing and onFinished event.

 *

 * @method finish

 **/

$.fn.steps.finish = function ()

{

    finishStep(this, getState(this));

};



/**

 * Gets the current step index.

 *

 * @method getCurrentIndex

 * @return {Integer} The actual step index (zero-based)

 * @for steps

 **/

$.fn.steps.getCurrentIndex = function ()

{

    return getState(this).currentIndex;

};



/**

 * Gets the current step object.

 *

 * @method getCurrentStep

 * @return {Object} The actual step object

 **/

$.fn.steps.getCurrentStep = function ()

{

    return getStep(this, getState(this).currentIndex);

};



/**

 * Gets a specific step object by index.

 *

 * @method getStep

 * @param index {Integer} An integer that belongs to the position of a step

 * @return {Object} A specific step object

 **/

$.fn.steps.getStep = function (index)

{

    return getStep(this, index);

};



/**

 * Inserts a new step to a specific position.

 *

 * @method insert

 * @param index {Integer} The position (zero-based) to add

 * @param step {Object} The step object to add

 * @example

 *     $("#wizard").steps().insert(0, {

 *         title: "Title",

 *         content: "", // optional

 *         contentMode: "async", // optional

 *         contentUrl: "/Content/Step/1" // optional

 *     });

 * @chainable

 **/

$.fn.steps.insert = function (index, step)

{

    return insertStep(this, getOptions(this), getState(this), index, step);

};



/**

 * Routes to the next step.

 *

 * @method next

 * @return {Boolean} Indicates whether the action executed

 **/

$.fn.steps.next = function ()

{

    return goToNextStep(this, getOptions(this), getState(this));

};



/**

 * Routes to the previous step.

 *

 * @method previous

 * @return {Boolean} Indicates whether the action executed

 **/

$.fn.steps.previous = function ()

{

    return goToPreviousStep(this, getOptions(this), getState(this));

};



/**

 * Removes a specific step by an given index.

 *

 * @method remove

 * @param index {Integer} The position (zero-based) of the step to remove

 * @return Indecates whether the item is removed.

 **/

$.fn.steps.remove = function (index)

{

    return removeStep(this, getOptions(this), getState(this), index);

};



/**

 * Sets a specific step object by index.

 *

 * @method setStep

 * @param index {Integer} An integer that belongs to the position of a step

 * @param step {Object} The step object to change

 **/

$.fn.steps.setStep = function (index, step)

{

    throw new Error("Not yet implemented!");

};



/**

 * Skips an certain amount of steps.

 *

 * @method skip

 * @param count {Integer} The amount of steps that should be skipped

 * @return {Boolean} Indicates whether the action executed

 **/

$.fn.steps.skip = function (count)

{

    throw new Error("Not yet implemented!");

};



/**

 * An enum represents the different content types of a step and their loading mechanisms.

 *

 * @class contentMode

 * @for steps

 **/

var contentMode = $.fn.steps.contentMode = {

    /**

     * HTML embedded content

     *

     * @readOnly

     * @property html

     * @type Integer

     * @for contentMode

     **/

    html: 0,



    /**

     * IFrame embedded content

     *

     * @readOnly

     * @property iframe

     * @type Integer

     * @for contentMode

     **/

    iframe: 1,



    /**

     * Async embedded content

     *

     * @readOnly

     * @property async

     * @type Integer

     * @for contentMode

     **/

    async: 2

};



/**

 * An enum represents the orientation of the steps navigation.

 *

 * @class stepsOrientation

 * @for steps

 **/

var stepsOrientation = $.fn.steps.stepsOrientation = {

    /**

     * Horizontal orientation

     *

     * @readOnly

     * @property horizontal

     * @type Integer

     * @for stepsOrientation

     **/

    horizontal: 0,



    /**

     * Vertical orientation

     *

     * @readOnly

     * @property vertical

     * @type Integer

     * @for stepsOrientation

     **/

    vertical: 1

};



/**

 * An enum that represents the various transition animations.

 *

 * @class transitionEffect

 * @for steps

 **/

var transitionEffect = $.fn.steps.transitionEffect = {

    /**

     * No transition animation

     *

     * @readOnly

     * @property none

     * @type Integer

     * @for transitionEffect

     **/

    none: 0,



    /**

     * Fade in transition

     *

     * @readOnly

     * @property fade

     * @type Integer

     * @for transitionEffect

     **/

    fade: 1,



    /**

     * Slide up transition

     *

     * @readOnly

     * @property slide

     * @type Integer

     * @for transitionEffect

     **/

    slide: 2,



    /**

     * Slide left transition

     *

     * @readOnly

     * @property slideLeft

     * @type Integer

     * @for transitionEffect

     **/

    slideLeft: 3

};



var stepModel = $.fn.steps.stepModel = {

    title: "",

    content: "",

    contentUrl: "",

    contentMode: contentMode.html,

    contentLoaded: false

};



/**

 * An object that represents the default settings.

 * There are two possibities to override the sub-properties.

 * Either by doing it generally (global) or on initialization.

 *

 * @static

 * @class defaults

 * @for steps

 * @example

 *   // Global approach

 *   $.steps.defaults.headerTag = "h3";

 * @example

 *   // Initialization approach

 *   $("#wizard").steps({ headerTag: "h3" });

 **/

var defaults = $.fn.steps.defaults = {

    /**

     * The header tag is used to find the step button text within the declared wizard area.

     *

     * @property headerTag

     * @type String

     * @default "h1"

     * @for defaults

     **/

    headerTag: "h1",



    /**

     * The body tag is used to find the step content within the declared wizard area.

     *

     * @property bodyTag

     * @type String

     * @default "div"

     * @for defaults

     **/

    bodyTag: "div",



    /**

     * The content container tag which will be used to wrap all step contents.

     *

     * @property contentContainerTag

     * @type String

     * @default "div"

     * @for defaults

     **/

    contentContainerTag: "div",



    /**

     * The action container tag which will be used to wrap the pagination navigation.

     *

     * @property actionContainerTag

     * @type String

     * @default "div"

     * @for defaults

     **/

    actionContainerTag: "div",



    /**

     * The steps container tag which will be used to wrap the steps navigation.

     *

     * @property stepsContainerTag

     * @type String

     * @default "div"

     * @for defaults

     **/

    stepsContainerTag: "div",



    /**

     * The css class which will be added to the outer component wrapper.

     *

     * @property cssClass

     * @type String

     * @default "wizard"

     * @for defaults

     * @example

     *     <div class="wizard">

     *         ...

     *     </div>

     **/

    cssClass: "wizard",



    /**

     * The css class which will be used for floating scenarios.

     *

     * @property clearFixCssClass

     * @type String

     * @default "clearfix"

     * @for defaults

     **/

    clearFixCssClass: "clearfix",



    /**

     * Determines whether the steps are vertically or horizontally oriented.

     *

     * @property stepsOrientation

     * @type stepsOrientation

     * @default horizontal

     * @for defaults

     * @since 1.0.0

     **/

    stepsOrientation: stepsOrientation.horizontal,



    /*

     * Tempplates

     */



    /**

     * The title template which will be used to create a step button.

     *

     * @property titleTemplate

     * @type String

     * @default "<span class=\"number\">#index#.</span> #title#"

     * @for defaults

     **/

    titleTemplate: "<span class=\"number\">#index#.</span> #title#",



    /**

     * The loading template which will be used to create the loading animation.

     *

     * @property loadingTemplate

     * @type String

     * @default "<span class=\"spinner\"></span> #text#"

     * @for defaults

     **/

    loadingTemplate: "<span class=\"spinner\"></span> #text#",



    /*

     * Behaviour

     */



    /**

     * Sets the focus to the first wizard instance in order to enable the key navigation from the begining if `true`. 

     *

     * @property autoFocus

     * @type Boolean

     * @default false

     * @for defaults

     * @since 0.9.4

     **/

    autoFocus: false,



    /**

     * Enables all steps from the begining if `true` (all steps are clickable).

     *

     * @property enableAllSteps

     * @type Boolean

     * @default false

     * @for defaults

     **/

    enableAllSteps: false,



    /**

     * Enables keyboard navigation if `true` (arrow left and arrow right).

     *

     * @property enableKeyNavigation

     * @type Boolean

     * @default true

     * @for defaults

     **/

    enableKeyNavigation: true,



    /**

     * Enables pagination if `true`.

     *

     * @property enablePagination

     * @type Boolean

     * @default true

     * @for defaults

     **/

    enablePagination: true,



    /**

     * Suppresses pagination if a form field is focused.

     *

     * @property suppressPaginationOnFocus

     * @type Boolean

     * @default true

     * @for defaults

     **/

    suppressPaginationOnFocus: true,



    /**

     * Enables cache for async loaded or iframe embedded content.

     *

     * @property enableContentCache

     * @type Boolean

     * @default true

     * @for defaults

     **/

    enableContentCache: true,



    /**

     * Shows the cancel button if enabled.

     *

     * @property enableCancelButton

     * @type Boolean

     * @default false

     * @for defaults

     **/

    enableCancelButton: false,



    /**

     * Shows the finish button if enabled.

     *

     * @property enableFinishButton

     * @type Boolean

     * @default true

     * @for defaults

     **/

    enableFinishButton: true,



    /**

     * Not yet implemented.

     *

     * @property preloadContent

     * @type Boolean

     * @default false

     * @for defaults

     **/

    preloadContent: false,



    /**

     * Shows the finish button always (on each step; right beside the next button) if `true`. 

     * Otherwise the next button will be replaced by the finish button if the last step becomes active.

     *

     * @property showFinishButtonAlways

     * @type Boolean

     * @default false

     * @for defaults

     **/

    showFinishButtonAlways: false,



    /**

     * Prevents jumping to a previous step.

     *

     * @property forceMoveForward

     * @type Boolean

     * @default false

     * @for defaults

     **/

    forceMoveForward: false,



    /**

     * Saves the current state (step position) to a cookie.

     * By coming next time the last active step becomes activated.

     *

     * @property saveState

     * @type Boolean

     * @default false

     * @for defaults

     **/

    saveState: false,



    /**

     * The position to start on (zero-based).

     *

     * @property startIndex

     * @type Integer

     * @default 0

     * @for defaults

     **/

    startIndex: 0,



    /*

     * Animation Effect Configuration

     */



    /**

     * The animation effect which will be used for step transitions.

     *

     * @property transitionEffect

     * @type transitionEffect

     * @default none

     * @for defaults

     **/

    transitionEffect: transitionEffect.none,



    /**

     * Animation speed for step transitions (in milliseconds).

     *

     * @property transitionEffectSpeed

     * @type Integer

     * @default 200

     * @for defaults

     **/

    transitionEffectSpeed: 200,



    /*

     * Events

     */



    /**

     * Fires before the step changes and can be used to prevent step changing by returning `false`. 

     * Very useful for form validation. 

     *

     * @property onStepChanging

     * @type Event

     * @default function (event, currentIndex, newIndex) { return true; }

     * @for defaults

     **/

    onStepChanging: function (event, currentIndex, newIndex) { return true; },



    /**

     * Fires after the step has change. 

     *

     * @property onStepChanged

     * @type Event

     * @default function (event, currentIndex, priorIndex) { }

     * @for defaults

     **/

    onStepChanged: function (event, currentIndex, priorIndex) { },



    /**

     * Fires after cancelation. 

     *

     * @property onCanceled

     * @type Event

     * @default function (event) { }

     * @for defaults

     **/

    onCanceled: function (event) { },



    /**

     * Fires before finishing and can be used to prevent completion by returning `false`. 

     * Very useful for form validation. 

     *

     * @property onFinishing

     * @type Event

     * @default function (event, currentIndex) { return true; }

     * @for defaults

     **/

    onFinishing: function (event, currentIndex) { return true; },



    /**

     * Fires after completion. 

     *

     * @property onFinished

     * @type Event

     * @default function (event, currentIndex) { }

     * @for defaults

     **/

    onFinished: function (event, currentIndex) { },



    /**

     * Fires after async content is loaded. 

     *

     * @property onContentLoaded

     * @type Event

     * @default function (event, index) { }

     * @for defaults

     **/

    onContentLoaded: function (event, currentIndex) { },



    /**

     * Fires when the wizard is initialized. 

     *

     * @property onInit

     * @type Event

     * @default function (event) { }

     * @for defaults

     **/

    onInit: function (event, currentIndex) { },



    /**

     * Contains all labels. 

     *

     * @property labels

     * @type Object

     * @for defaults

     **/

    labels: {

        /**

         * Label for the cancel button.

         *

         * @property cancel

         * @type String

         * @default "Cancel"

         * @for defaults

         **/

        cancel: "Cancel",



        /**

         * This label is important for accessability reasons.

         * Indicates which step is activated.

         *

         * @property current

         * @type String

         * @default "current step:"

         * @for defaults

         **/

        current: "current step:",



        /**

         * This label is important for accessability reasons and describes the kind of navigation.

         *

         * @property pagination

         * @type String

         * @default "Pagination"

         * @for defaults

         * @since 0.9.7

         **/

        pagination: "Pagination",



        /**

         * Label for the finish button.

         *

         * @property finish

         * @type String

         * @default "Finish"

         * @for defaults

         **/

        finish: "Finish",



        /**

         * Label for the next button.

         *

         * @property next

         * @type String

         * @default "Next"

         * @for defaults

         **/

        next: "Next",



        /**

         * Label for the previous button.

         *

         * @property previous

         * @type String

         * @default "Previous"

         * @for defaults

         **/

        previous: "Previous",



        /**

         * Label for the loading animation.

         *

         * @property loading

         * @type String

         * @default "Loading ..."

         * @for defaults

         **/

        loading: "Loading ..."

    }

};

})(jQuery);