jQuery不适用于文档加载后创建的元素

Question

I created two elements dinamically with jQuery:

a picture and a Close button

I wrote the code to remove both in doument.ready function:

$( ".deletepreview" ).click(function() {
    code = $(this).data("prevcode");
    $('#'+code).remove();
    $(this).remove();
});

But it doesn't work, and I think this is because the code doesn't search in the code created after the document load.

How can I solve this problem?

Answer 1

You need to use delegated events via on() if you want events to be handled on dynamically added elements:

$(document).on("click", ".deletepreview",function() {
  var code = $(this).data("prevcode");
  $('#'+code).remove();
  $(this).remove();
});

I slightly modified your example: always declare variables with var in closures except when you need to.

Answer 2

For dynamically created elements try using delegation with on like:

Event handlers are bound only to the currently selected elements; they must exist on the page at the time your code makes the call to .on(). To ensure the elements are present and can be selected, perform event binding inside a document ready handler for elements that are in the HTML markup on the page. If new HTML is being injected into the page, select the elements and attach event handlers after the new HTML is placed into the page. Or, use delegated events to attach an event handler, as described next.

Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, you can use delegated events to avoid the need to frequently attach and remove event handlers. This element could be the container element of a view in a Model-View-Controller design, for example, or document if the event handler wants to monitor all bubbling events in the document. The document element is available in the head of the document before loading any other HTML, so it is safe to attach events there without waiting for the document to be ready.

Code:

$('body').on('click', '.deletepreview', function() {
  var code = $(this).data('prevcode');
  $('#'+code).remove();
  $(this).remove();
});