JQuery Draggable Multiple Items with the same id not working

问题

Do you need to give each draggable element a different name? I have 3 images I want to be able to drag them around. I tried to give them all the same id but it fails. I will have a variable number of images so I need them all to have the same id. What is going wrong here?

Here is my code:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>jQuery UI Draggable - Default functionality</title>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.8.3.js"></script>
<script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css" />
<style>
#draggable { width: 150px; height: 150px; padding: 0.5em; border:1px solid black;}
</style>
<script>
$(document).ready(function(){
  $("#draggable").draggable();
});
</script>
</head>
<body>
<img id="draggable" src="small/Koala.jpg"/>
<img id="draggable" src="small/Desert.jpg"/>
<img id="draggable" src="small/Tulips.jpg"/>
</body>
</html>

Now it will not clone - I want to clone the image and drop the clone into the droppable box.

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Wall Builder</title>
    <link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" />
    <script src="http://code.jquery.com/jquery-1.8.3.js"></script>
    <script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
    <link rel="stylesheet" href="/resources/demos/style.css" />
    <style>
        .draggable { width: 85px; height: 85px; padding: 0.5em; border:1px solid black;}
        .droppable { width: 150px; height: 150px; padding: 0.5em; border:1px solid black;}
        </style>
    <script>
    $(document).ready(function() {
      $(".draggable").draggable({
        revert: "invalid"
       ,helper: 'clone'
      });
      $( ".droppable" ).droppable({
        accept: "draggable"
      });
    });
    </script>
</head>
<body>
<img class="draggable" id="1" src="small/Koala.jpg"/>
<img class="draggable" id="2" src="small/Desert.jpg"/>
<img class="draggable" id="3" src="small/Tulips.jpg"/>
<div class="droppable" id="d1"></div>
<div class="droppable" id="d2"></div>
<div class="droppable" id="d3"></div>
<div class="droppable" id="d4"></div>
<div class="droppable" id="d5"></div>

</body>
</html>

回答1:

You need to give them different ids and then select by class. The point of an id is to be distinct, and if there are duplicates jQuery will just select the first one it finds.

Something like:

<script>
$(document).ready(function(){
  $(".draggable").draggable();
});
</script>
</head>
<body>
<img class="draggable" src="small/Koala.jpg"/>
<img class="draggable" src="small/Desert.jpg"/>
<img class="draggable" src="small/Tulips.jpg"/>
</body>
</html>

(sounds like you might want to read up on the difference between ids and classes)

来源：https://stackoverflow.com/questions/13995544/jquery-draggable-multiple-items-with-the-same-id-not-working

标签

jquery

jquery-ui

drag-and-drop

draggable