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What I want to do here is that when my checkbox 'chBeamer' is checked the images of the beamers should appear if their beamername is not '/' (/ means that their is no beamer registrated)

checkbox

<input ng-model="chBeamer" type="checkbox" id="chBeamer" name="chBeamer"/>

ng-show

<div ng-show="chBeamer"><img id="beamer" src="../app/img/beamer.png"/></div>

I don't know how to start with this, I tried with a filter and condition (chBeamer !== '/') but this didn't work...

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From your post I can't quite understand where beamername is coming from, but you can do:

<div ng-show="chBeamer && beamername !== '/'">...</div>

But I feel like this is part of a bigger picture, e.g. there must be multiple items? What does your underlying model look like?

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Are you sure? I don't think evaluating an expression like that works.

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