droppable vérif si élément existe déjà

Bonsoir

Exemple :
Code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
<!doctype html>
<html lang="fr">
<head>
	<meta charset="utf-8">
	<meta name="Author" content="Daniel Hagnoul">
	<title>Forum jQuery</title>
	<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.17/themes/humanity/jquery-ui.css">
	<link rel="stylesheet" href="http://danielhagnoul.developpez.com/lib/jPicker/css/jPicker.dvjh-1.1.6.min.css" />
	<style>
		/* Base */
		html {font-size:62.5%; } /* Pour 62.5% 1rem =~ 10px */
		div,p,h1,h2,h3,h4,h5,h6,ul,ol,dl,form,table,img {margin:0; padding:0; }
		body {background-color:rgb(122, 79, 79); color:#000000; font-family:sans-serif; font-size:1.4rem; font-style:normal; font-weight:normal; line-height:normal; letter-spacing:normal; }
		h1,h2,h3,h4,h5 {font-family:'Redressed', cursive; padding:0.6rem; }
		p, div, td {word-wrap:break-word; }
		pre, code {white-space:pre-wrap; word-wrap:break-word; }
		img, input, textarea, select {max-width:100%; }
        img {border:none; }
		h1 {font-size:2.4rem; text-shadow: 0.4rem 0.4rem 0.4rem #bbbbbb; text-align:center; }
		p {padding:0.6rem; }
		.conteneur {width:95%; min-width:80rem; min-height:30rem; margin:1.2rem auto; background-color:#ffffff; color:#000000; border:0.1rem solid #666666; }
		footer {margin-left:3.6rem; }
 
		/* -- */
		#products { float:left; width: 50rem; margin-right: 2rem; }
		#cart { width: 20rem; float: left; }
		#products h1, #cart h1 { padding: .2rem; margin: 0; }
		#cart ol { margin: 0; padding: 1rem 0 1rem 3rem; }
	</style>
</head>
<body>
	<h1>Forum jQuery</h1>
	<section class="conteneur">
 
		<div id="products">
			<h1 class="ui-widget-header">Products</h1>	
			<div id="catalog">
				<h3><a href="#">T-Shirts</a></h3>
				<div>
					<ul>
						<li>Lolcat Shirt</li>
						<li>Cheezeburger Shirt</li>
						<li>Buckit Shirt</li>
					</ul>
				</div>
				<h3><a href="#">Bags</a></h3>
				<div>
					<ul>
						<li>Zebra Striped</li>
						<li>Black Leather</li>
						<li>Alligator Leather</li>
					</ul>
				</div>
				<h3><a href="#">Gadgets</a></h3>
				<div>
					<ul>
						<li>iPhone</li>
						<li>iPod</li>
						<li>iPad</li>
					</ul>
				</div>
			</div>
		</div>
 
		<div id="cart">
			<h1 class="ui-widget-header">Shopping Cart</h1>
			<div class="ui-widget-content">
				<ol>
					<li class="placeholder">Add your items here</li>
				</ol>
			</div>
		</div>
 
	</section>
	<footer itemscope itemtype="http://data-vocabulary.org/Person">
		<time datetime="2012-01-13T20:55:26.000+01:00" pubdate>2012-01-13</time>
		<span itemprop="name">Daniel Hagnoul</span>
		<a href="http://www.developpez.net/forums/u285162/danielhagnoul/" itemprop="url">@danielhagnoul</a>
	</footer>
	<script charset="utf-8" src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
	<script charset="utf-8" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.17/i18n/jquery-ui-i18n.min.js"></script>
	<script charset="utf-8" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.17/jquery-ui.min.js"></script>
	<script charset="utf-8" src="http://danielhagnoul.developpez.com/lib/jPicker/jpicker-1.1.6.min.js"></script>
	<script>	
		"use strict";
 
		// Date ISO format long US
		Date.prototype.formatISO = function(){
			this._nowFormat = 'aaaa-mm-jjThh:ii:ss.000Szz:00';
			this._toLen2 = function(_nowStr){
				_nowStr = _nowStr.toString();
				return ('0'+_nowStr).substr(-2,2);
			};
			this._nowFormat = this._nowFormat.replace(/j+/, this._toLen2(this.getDate()));
			this._nowFormat = this._nowFormat.replace(/m+/, this._toLen2(this.getMonth()+1));
			this._nowFormat = this._nowFormat.replace(/a+/, this.getFullYear());
			this._nowFormat = this._nowFormat.replace(/h+/, this._toLen2(this.getHours()));
			this._nowFormat = this._nowFormat.replace(/i+/, this._toLen2(this.getMinutes()));
			this._nowFormat = this._nowFormat.replace(/s+/, this._toLen2(this.getSeconds()));
			this._nowFormat = this._nowFormat.replace(/S+/, (this.getTimezoneOffset() < 0) ? ("+") : ("-"));
			this._nowFormat = this._nowFormat.replace(/z+/, this._toLen2(Math.abs(this.getTimezoneOffset()/60)));
			return this._nowFormat;
		};
 
		$(function(){
			/* Base */
			console.log(new Date().formatISO());
 
			/* -- */
			$( "#catalog" ).accordion();
 
			$( "#catalog li" ).draggable({
				appendTo: "body",
				helper: "clone"
			});
 
			$( "#cart ol" ).droppable({
				activeClass: "ui-state-default",
				hoverClass: "ui-state-hover",
				accept: ":not(.ui-sortable-helper)",
				drop: function( event, ui ) {
					$( this ).find( ".placeholder" ).remove();
 
					var bool = false;
 
					$( "li", this ).each( function( i, item){
						if ( $( item ).text() === ui.draggable.text() ){
							bool = true;
							return false;
						}
					});
 
					if ( !bool ){
						$( "<li></li>" ).text( ui.draggable.text() ).appendTo( this );
					}
				}
			}).sortable({
				items: "li:not(.placeholder)",
				sort: function() {
					// gets added unintentionally by droppable interacting with sortable
					// using connectWithSortable fixes this, but doesn't allow you to customize active/hoverClass options
					$( this ).removeClass( "ui-state-default" );
				}
			});
 
			/* jPicker : http://www.digitalmagicpro.com/jPicker/, outil pour choisir rapidement une couleur */
			$.fn.jPicker.defaults.images.clientPath="http://danielhagnoul.developpez.com/lib/jPicker/images/";
			$(".conteneur").jPicker({window:{expandable:true,title:"jPicker : choissisez une couleur :",
			alphaSupport:true,position:{x:'screenCenter',y:'top'}},color:{ active:new $.jPicker.Color({ r: 210, g: 214, b: 98, a: 128 })}},
			function(color, context){var c = color.val("all");if (c){$("body").css("backgroundColor", "rgba(" +
			c.r + "," + c.g + "," + c.b + "," + (c.a/255).toFixed(2) + ")");}});
		});
 
		$(window).load(function(){
 
		});
	</script>
</body>  
</html>