/*
jQuery Placeholder 1.1.1

Copyright (c) 2010 Michael J. Ryan (http://tracker1.info/)

Dual licensed under the MIT and GPL licenses:
	http://www.opensource.org/licenses/mit-license.php
	http://www.gnu.org/licenses/gpl.html
*/

(function($) {

    var ph = "PLACEHOLDER-INPUT";
    var phl = "PLACEHOLDER-LABEL";
    var boundEvents = false;
    var default_options = {
        labelClass: 'placeholder'
    };

    //check for native support for placeholder attribute, if so stub methods and return
    var input = document.createElement("input");
    if ('placeholder' in input) {
        $.fn.placeholder = $.fn.unplaceholder = function() {}; //empty function
        delete input; //cleanup IE memory
        return;
    };
    delete input;

    $.fn.placeholder = function(options) {
        bindEvents();

        var opts = $.extend(default_options, options)

        this.each(function() {
            var rnd = Math.random().toString(32).replace(/\./, ''),
                input = $(this),
                label = $('<label style="position:absolute;display:none;top:0;left:0;"></label>');

            if (!input.attr('placeholder') || input.data(ph) === ph) return; //already watermarked

            //make sure the input tag has an ID assigned, if not, assign one.
            if (!input.attr('id')) input.attr('id') = 'input_' + rnd;

            label.attr('id', input.attr('id') + "_placeholder")
                .data(ph, '#' + input.attr('id')) //reference to the input tag
                .attr('for', input.attr('id'))
                .addClass(opts.labelClass)
                .addClass(opts.labelClass + '-for-' + this.tagName.toLowerCase()) //ex: watermark-for-textarea
                .addClass(phl)
                .text(input.attr('placeholder'));

            input
                .data(phl, '#' + label.attr('id')) //set a reference to the label
                .data(ph, ph) //set that the field is watermarked
                .addClass(ph) //add the watermark class
                .after(label); //add the label field to the page

            //setup overlay
            itemIn.call(this);
            itemOut.call(this);
        });
    };

    $.fn.unplaceholder = function() {
        this.each(function() {
            var input = $(this),
                label = $(input.data(phl));

            if (input.data(ph) !== ph) return;

            label.remove();
            input.removeData(ph).removeData(phl).removeClass(ph);
        });
    };


    function bindEvents() {
        if (boundEvents) return;

        //prepare live bindings if not already done.
        $('.' + ph)
            .live('click', itemIn)
            .live('focusin', itemIn)
            .live('focusout', itemOut);
        bound = true;

        boundEvents = true;
    };

    function itemIn() {
        var input = $(this),
            label = $(input.data(phl));

        label.css('display', 'none');
    };

    function itemOut() {
        var that = this;

        //use timeout to let other validators/formatters directly bound to blur/focusout work first
        setTimeout(function() {
            var input = $(that);
            $(input.data(phl))
                .css('top', input.position().top + 'px')
                .css('left', input.position().left + 'px')
                .css('display', !!input.val() ? 'none' : 'block');
        }, 200);
    };

}(jQuery));