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Preventing tabs in a modal overlay

Posted on 2013-11-11
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Last Modified: 2013-11-12
I'm using a Telerik control which sets a modal overlay across a page while a modal dialog is showing.

Here is the div for the overlay:

<div unselectable="on" class="TelerikModalOverlay" style="position: absolute; left: 0px; top: 0px; z-index: 7999; background-color: rgb(170, 170, 170); opacity: 0.5; width: 1147px; height: 969px;"></div>

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The trouble is it is still possible to tab onto some of the elements on the page below - is there some extra attribute I can set on this div that will prevent the user being able to tab off the modal dialog and onto the page below?
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Question by:purplesoup
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Alexandre Simões earned 500 total points
ID: 39640907
You can handle the elements focus outside the popup.
If an element gets the focus and it's outside the popup, put the focus on the first element of the popup.

In the following demo I simulate this with 2 areas.
Area two behaves like your popup, and the button toggles the area visibility.
While area 2 is visible you won't be able to focus outside its controls.
http://jsfiddle.net/GF7Ba/4/
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