jquery.watermarkinput.js

/*
 * Copyright (c) 2007 Josh Bush (digitalbush.com)
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:

 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE. 
 */
 
/*
 * Version: Beta 1
 * Release: 2007-06-01
 */ 
(function($) {
	var map=new Array();
	$.Watermark = {
		ShowAll:function(){
			for (var i=0;i<map.length;i++){
				if(map[i].obj.val()==""){
					map[i].obj.val(map[i].text);					
					map[i].obj.css("color",map[i].WatermarkColor);
				}else{
				    map[i].obj.css("color",map[i].DefaultColor);
				}
			}
		},
		HideAll:function(){
			for (var i=0;i<map.length;i++){
				if(map[i].obj.val()==map[i].text)
					map[i].obj.val("");					
			}
		}
	}
	
	$.fn.Watermark = function(text,color) {
		if(!color)
			color="#aaa";
		return this.each(
			function(){		
				var input=$(this);
				var defaultColor=input.css("color");
				map[map.length]={text:text,obj:input,DefaultColor:defaultColor,WatermarkColor:color};
				function clearMessage(){
					if(input.val()==text)
						input.val("");
					input.css("color",defaultColor);
				}

				function insertMessage(){
					if(input.val().length==0 || input.val()==text){
						input.val(text);
						input.css("color",color);	
					}else
						input.css("color",defaultColor);				
				}

				input.focus(clearMessage);
				input.blur(insertMessage);								
				input.change(insertMessage);
				
				insertMessage();
			}
		);
	};
})(jQuery);