[jquery] How to activate the Bootstrap modal-backdrop?

I want to put up an overlay on my screen while some ajax stuff is running. Building my own overlay div isn't a big deal, but, since I'm already using Bootstrap, I figure I might as well use its .modal-backdrop -- it should already be around, and there's some value to consistency and all that.

The problem is I can't find the right way to do it -- I've tried adding classes to .modal-backdrop, or calling .show() on it, but it's not working.

Note that I don't want to bring up a whole modal dialog, but just reveal and then hide the backdrop.

Any suggestions?

This question is related to jquery twitter-bootstrap

The answer is


Just append a div with that class to body, then remove it when you're done:

// Show the backdrop
$('<div class="modal-backdrop"></div>').appendTo(document.body);

// Remove it (later)
$(".modal-backdrop").remove();

Live Example:

_x000D_
_x000D_
$("input").click(function() {_x000D_
  var bd = $('<div class="modal-backdrop"></div>');_x000D_
  bd.appendTo(document.body);_x000D_
  setTimeout(function() {_x000D_
    bd.remove();_x000D_
  }, 2000);_x000D_
});
_x000D_
<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" type="text/css" />_x000D_
<script src="//code.jquery.com/jquery.min.js"></script>_x000D_
<script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>_x000D_
<p>Click the button to get the backdrop for two seconds.</p>_x000D_
<input type="button" value="Click Me">
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_x000D_


Pretty strange, it should work out of the box as the ".modal-backdrop" class is defined top-level in the css.

<div class="modal-backdrop"></div>

Made a small demo: http://jsfiddle.net/PfBnq/