https://libros.com/js/io.inputDefault.js

1(function( $ ){
2
3  $.fn.inputDefault = function( options ) {  
4
5    var settings = {
6      'text'         : 'B\xfasqueda...',
7      'default-color' : '#666666',
8	  'writing-color' : '#000000',
9	  'password' : false
10    };
11	
12	
13
14    return this.each(function() {
15      // If options exist, lets merge them
16      // with our default settings
17      if ( options ) { 
18        $.extend( settings, options );
19      }
20	  
21	  function getVal(){ alert('ea'); }
22	
23	settings['text']=unescape(settings['text']);
24	  
25	  var $this = $(this);
26	  
27	  $this.attr('default', settings['text']);
28	  
29	  if($this.val()==''){
30		  $this.val(settings['text']);
31		  $this.css('color', settings['default-color']);
32	  }
33	  
34	  if(settings['password']){
35		  var id=$this.attr('id');
36		  
37		  if($this.is('input')) $('#'+settings['password']).append('<input type="text" id="'+id+'_clone" />');
38		  else $('#'+settings['password']).append('<textarea id="'+id+'_clone"></textarea>');
39		  
40		  var $clone=$('#'+id+'_clone');
41		  $this.hide();
42		  
43		  $clone.val(settings['text']);
44		  $clone.css('color', settings['default-color']);
45		  
46		  $clone.focus(function(){
47				$this.show();
48				$clone.hide();
49				$this.val("");
50				$this.focus();
51			});
52	  }
53	  
54      $this.focus(function(){
55			if($this.val()==settings['text']){ 
56				$this.val("");
57				$this.css('color', settings['writing-color']);
58			}
59		});
60		
61		$this.blur(function(){
62			if($this.val().replace(' ','')==""){ 
63				$this.val(settings['text']);
64				$this.css('color', settings['default-color']);
65				if(settings['password']){
66					$this.hide();
67					$clone.show();
68				}
69			}
70		});
71
72    });
73
74  };
75  
76    $.fn.getVal = function( options ) {  
77        var val=this.val();
78		var def=this.attr('default');
79		
80		if(val!=def) return val;
81		return '';
82	};
83  
84    $.fn.isDefault = function( options ) {  
85        var val=this.getVal();
86		if(val=='') return true;
87		return false;
88	};
89  
90})( jQuery );