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Filename : ImageSelect.jquery.js
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/**
 * Image Select (Version 1.8)
 *
 * Image Select is an extention to the Chosen, a Select Box Enhancer for
 * jQuery and Prototype, full source at https://github.com/harvesthq/chosen
 *
 * This plugin extension was designed as a humanized UI element for social networking
 * sites that need to faciliate relations between people. Research shows that people
 * are extremely sensitvie to photos of others, so we needed to revamp the traditional
 * UI elements to make them more intuitive and human.
 *
 * Hope you find it helpful, and get back if you have any feedback/improvements.
 *
 * @author    Adnan M.Sagar, PhD <adnan@websemantics.ca>
 * @copyright 2002-2015 Web Semantics, Inc. (http://websemantics.ca) & AlterSpark Corp. (http://www.alterspark.com)
 * @license   http://www.opensource.org/licenses/mit-license.php MIT
 * @link      http://websemantics.ca
 * @package   websemantics/image-select
 */

(function($) {

// Image template, this can be overridden from the constructor (options.template),
// must contains {src} placeholder. Ther eare two class names
// 'chose-image' or 'chose-image-small', modifiy in CSS
var fn_template = '<img class="{class_name}" src="{url}" />'

function prependTemplate(element, option, template, rtl, multiple, cls){
    // summery:
    // This will fill-in the provided template with image source and css class
    // then add it to the element.
    //
    // element: Dom
    //          This is the span node
    // object: Object,
    //          The select option to get image url
    // template: String
    //          Html content
    // rtl: Boolean,
    //          Right to Left
    // multiple: Boolean
    //          Used to select the approperiate css class, default to 'true'
    // cls*: String (optional)
    //          Css styles class

    var src = $(option).data('img-src')

    if(src != undefined && src > ''){

        element = $(element)

        text     = $(option).text()
        multiple = (multiple != undefined) ? multiple : true
        cls      = cls || (multiple ? 'chose-image' : 'chose-image-small')
        cls      = rtl ? cls + ' rtl' : cls
        template = template.replace('{url}',src)
                           .replace('{class_name}',cls)
                           .replace('{text}',text)

        // Empty the element
        element.empty()

        // Insert after if ltr or multiple select, otherwise, insert before
        if(rtl && multiple){
            element.append(template)
        }
        else {
            element.prepend(template)
        }
    }
}

function getSelectedOptions(chosen){
    // summery:
    //      Return a list of selected items/options with the selected 'option' elements
    //      and chosen 'span' elements.
    //
    // chosen: Chosen
    //          The Chosen object

    var items    = []
    var options  = $(chosen.form_field).find('option:selected') || []
    var spans    = (chosen.is_multiple) ? $(chosen.container).find('.chosen-choices span'):
                                          $(chosen.container).find('.chosen-single span')

    for(var i = 0; i < options.length; i++)
        for(var j = 0; j < spans.length; j++)
            if($(spans[j]).text() == $(options[i]).text())
                items.push({span:spans[j],option:options[i]})

    return items
}

// Store the original 'chosen' method
var fn_chosen = $.fn.chosen

$.fn.extend({
 // summery:
 //  Extend the original 'chosen' method to support images
 chosen: function(params) {

    params = params || {}

    // Original behavior - use function.apply to preserve context
    var ret = fn_chosen.apply(this, arguments)

    // Process all select elements to attach event handlers
    // (change, hiding_dropdown and showing_dropdown)

    this.each(function() {

        var $this = $(this), chosen = $this.data('chosen')

        $this.on("chosen:hiding_dropdown", function(e, chosen){
            // summery
            //  Triggers when hidding dropdown, explain why:TODO.
            //
            // evt: Event
            //      The event object
            // _chosen: Object {chosen:Chosen}
            //      Contains the current instance of Chosen class

            var options       = getSelectedOptions(chosen.chosen)
            var rtl           = chosen.chosen.is_rtl
            var multiple      = chosen.chosen.is_multiple
            var html_template = params.html_template ||
                                (rtl && multiple ? '{text}' + fn_template : fn_template + '{text}')

            for(var i = 0; i < options.length; i++){
                prependTemplate(options[i].span, options[i].option, html_template, rtl, multiple)
            }
        })

        $("input.chosen-search-input").on('keyup', function () {
            $this.trigger('chosen:showing_dropdown',{chosen:$this.data('chosen')})
        });

        $this.on("chosen:showing_dropdown", function showing_dropdown(evt, chosen){
            // summery
            //    This function is triggered when the chosen instance dropdown list
            //    becomes visible. http://forwebonly.com/jquery-chosen-custom-events-and-how-to-use-them/
            //
            // evt: Event
            //      The event object
            // chosen: Object {chosen:Chosen}
            //      Contains the current instance of Chosen class

            var chosen        = chosen.chosen
            var options       = chosen.form_field.options || []
            var rtl           = chosen.is_rtl
            var html_template = params.html_template ||
                                (rtl ? '{text}'+fn_template : fn_template+'{text}')

            var lis = $(chosen.container).find('.chosen-drop ul li:not(:has(img))')

            for(var i = 0; i < lis.length; i++){
                var li      = lis[i]
                var option  = $(options[i])
                var idx     = $(li).attr('data-option-array-index')

                /* correct option index */

                if (idx){
                  option = options[chosen.results_data[idx].options_index]
                  prependTemplate(li, option, html_template, rtl, true, 'chose-image-list')
                }

            }
        })

        $this.on("chosen:ready", function change(e, chosen){
            // summery:
            //  Trigger hide dropdown when ready.
            //  TODO: remove as it is never triggered!
            $this.trigger('chosen:hiding_dropdown',chosen)
        })

        $this.on("chosen:updated", function change(e){
            // summery
            //  Update after `chosen:updated` event is triggered
          $this.trigger('chosen:hiding_dropdown',{chosen:chosen})
        })

        $this.on('chosen:filter', function(evt, chosen){
            // summery
            //  Support search, pending: https://github.com/harvesthq/chosen/pull/2373
          $this.trigger('chosen:showing_dropdown',{chosen:chosen.chosen})
        })

        // Finally, trigger hiding_dropdown on all select elements
        if(typeof chosen != 'undefined') {
          $this.trigger('chosen:hiding_dropdown',{chosen:chosen})
        }
    })
    return $(this);
 }
})


})(jQuery)