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/**
 * jquery.placeholder http://matoilic.github.com/jquery.placeholder
 *
 * @version v0.2.4
 * @author Mato Ilic <info@matoilic.ch>
 * @copyright 2013 Mato Ilic
 *
 * Patched to allow for elements with both value and placeholder attributes
 * and to track user typing to allow for values equal to the placeholder
 * attribute
 *
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 */
;(function($, doc, debug) {
    var input = ('placeholder' in doc.createElement('input')),
        textarea = ('placeholder' in doc.createElement('textarea')),
        selector = ':input[placeholder]';

    $.placeholder = {input: input, textarea: textarea};

    //skip if there is native browser support for the placeholder attribute
    if(!debug && input && textarea) {
        $.fn.placeholder = function() {};
        return;
    }

    if(!debug && input && !textarea) {
        selector = 'textarea[placeholder]';
    }

    /* patch jQuery.fn.val to return an empty value if the value matches 
     * the placeholder
     */
    $.fn.realVal = $.fn.val;
    $.fn.val = function() {
        var $element = $(this), val, placeholder;
        if(arguments.length > 0) return $element.realVal.apply(this, arguments);

        val = $element.realVal();
        placeholder = $element.attr('placeholder');

        return ((val == placeholder) ? '' : val);
    };

    $.fn.isUserFilled = function() {
        var $element = $(this);
        if ( "true" === $element.data("user-filled" ) || true === $element.data("user-filled" ) ) {
            return true;
        }
        return false;
    }

    $.fn.setUserFilled = function( flag ) {
        var $element = $(this);
        if ( flag ) {
            $element.data("user-filled", true);
        } else {
            $element.removeData("user-filled");
        }
    }

    function trackTyping() {
        var $element = $(this);
        $element.setUserFilled($element.realVal().length > 0);
    }

    function clearForm() {
        $(this).find(selector).each(removePlaceholder);
    }

    function extractAttributes(elem) {
        var attr = elem.attributes, copy = {}, skip = /^jQuery\d+/;
        for(var i = 0; i < attr.length; i++) {
            if(attr[i].specified && !skip.test(attr[i].name)) {
                copy[attr[i].name] = attr[i].value;
            }
        }
        return copy;
    }

    function removePlaceholder() {
        var $target = $(this), $clone, $orig;

        if($target.is(':password')) return;

        if($target.data('password')) {
            $orig = $target.next().show().focus();
            $('label[for=' + $target.attr('id') + ']').attr('for', $orig.attr('id'));
            $target.remove();
        } else if($target.realVal() == $target.attr('placeholder') && !$target.isUserFilled()) {
            $target.val('');
            $target.removeClass('placeholder');
        }
    }

    function setPlaceholder() {
        var $target = $(this), $clone, placeholder, hasVal, cid;
        placeholder = $target.attr('placeholder');

        if($.trim($target.val()).length > 0 || $target.isUserFilled()) return;

        if($target.is(':password')) {
            cid = $target.attr('id') + '-clone';
            $clone = $('<input/>')
                .attr($.extend(extractAttributes(this), {type: 'text', value: placeholder, 'data-password': 1, id: cid}))
                .addClass('placeholder');

            $target.before($clone).hide();
            $('label[for=' + $target.attr('id') + ']').attr('for', cid);
        } else {
            $target.val(placeholder);
            $target.addClass('placeholder');
        }
    }

    $.fn.placeholder = function() {
        this.filter(selector).each(function() {
            $(this).setUserFilled(($(this).realVal().length > 0));
        });
        this.filter(selector).each(setPlaceholder);
        return this;
    };

    $(function($) {
        var $doc = $(doc);
        $doc.on('submit', 'form', clearForm);
        $doc.on('focus', selector, removePlaceholder);
        $doc.on('blur', selector, setPlaceholder);
        $doc.on('keyup', selector, trackTyping);
        $(selector).placeholder();
    });
})(jQuery, document, window.debug);