/*
 * searchField - jQuery plugin to display and remove
 * a default value in a searchvalue on blur/focus
 *
 * Copyright (c) 2008 J�örn Zaefferer
 * 
 * $Id$
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 */

/**
 * Clear the help text in a search field (either in the value or title attribute)
 * when focused, and restore it on blur if nothing was entered. If the value is
 * blank but there is a title attribute, the title will be moved to the initial value.
 *
 * @example $('#quicksearch').searchField();
 * @before <input id="quicksearch" title="Enter search here" name="quicksearch" />
 * @result <input id="quicksearch" value="Enter search here" name="quicksearch" />
 *
 * @name searchField
 * @type jQuery
 * @cat Plugins/SearchField
 */
jQuery.fn.searchField = function(mark){
        return this.each(function() {
                var mark = mark || this.title;
                
                if (!mark)
                        return;
                        
                var target = this;
                var original = $(this);
                if (this.type == "password") {
                        target = $("<input />")
                                .insertBefore(this)
                                .css("display", $(this).css("display"))
                                .attr("size", this.size)
                                .attr("title", this.title)
                                .attr("class", this.className)
                                .addClass("watermark")[0];
                        if (!this.value) {
                                $(this).hide();
                        } else {
                                $(target).hide();
                        }
                }
                
                if(!target.value || mark == this.value) {
                        $(target).addClass("watermark");
                }
                
                // setup initial value
                if (!this.value || target != this) {
                        target.value = mark;
                }
                
                $(target).focus(function() {
                                if (target != original[0]) {
                                $(this).hide();
                                original.show().focus();
                        } else if (this.value == mark) {
                                this.value = '';
                                $(this).removeClass("watermark");
                        }
                });
                $(this).blur(function() {
                        if (!this.value.length) {
                                if (target != original[0]) {
                                        $(target).show();
                                        original.hide();
                                } else {
                                        this.value = mark;
                                        $(this).addClass("watermark")
                                } 
                        }
                });
                
                // make sure that when the form is submitted, the watermark is
                // replaced with the empty string, which is usually the expected behavior.
       $(this).parents("form:first").submit(function(){
           if ($(target).hasClass("watermark")) {
               $(target).attr("value", "");
               $(target).removeClass("watermark");
           }
       });
        });
};