jQuery sortable issue = Uncaught TypeError：undefined不是函数

Question

(rewriting the question now that it's more specific)

I had a sortable list working perfectly while I had manual 'li' items created. Then, I stopped creating the items manually since they should come from the server side. But once I started populating the li items through jquery, the sorting function stopped working.

<section>
    <div class="taskcontainer">
        <h1>alpha</h1>
        <ul id="sortable1" class="connected sortable list">
<!-- <li class="list-group-item">This worked perfectly before</li> -->
        </ul>
    </div>      
</section>

<script>
$('.sortable').sortable();

$(function() {                       //run when the DOM is ready
  $(".list-group-item").click(function() {  //use a class, since your ID gets mangled
    $(this).addClass("completed");      //add the class to the clicked element
  });
});

</script>

<script>
function getTasks()
{
    var jsontasks = jQuery.parseJSON('<%=raw(@jsontasks)%>');
    $.each(jsontasks, function(index, element) {
        $("#sortable1").append("<li class='list-group-item'>" + element.name + "</li>");

    }); 

    $('.sortable').sortable();

}   
</script>

Now, when I run the getTasks function, the li items get populated correctly. But the sortable function can't fire. Browser returns an error:

Uncaught TypeError: undefined is not a function

Somehow the sortable feature is not accessible from within the getTasks function.

Here is the full code: http://pastebin.com/wbdNLC9f

Thanks

Answer 1

I can only suggest that you need to update your jQuery UI code. Similar code works:

 $('.sortable').sortable(); function getTasks() { var jsontasks = { "name1": { name: "geoff"}, "name2": { name: "mark"}, "name3": { name: "lucy"}, "name4": { name: "richard"}, "name5": { name: "amelia"}, "name6": { name: "james"}, "name7": { name: "ronald"} } $.each(jsontasks, function (index, element) { $("#sortable1").append("<li class='list-group-item'>" + element.name + "</li>"); }); $('.sortable').sortable(); } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/themes/smoothness/jquery-ui.css"> <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/jquery-ui.min.js"></script> <section> <div class="taskcontainer"> <h1>alpha</h1> <ul id="sortable1" class="connected sortable list"></ul> </div> <button onclick="getTasks();">Sortable</button> </section> 

As the code snippet seems to be broken in Google Chrome (seems to be a Stack Overflow problem, works in Firefox though), here's the Fiddle I used to test this.

Answer 2

将所有元素添加到列表后，尝试调用sortable。