I want to show the field "EMailadresse" if the value of the field "ShowEMailadresse" is = 1
I tried the following, but that doesn't seem to work:

<div class="contentBoxTextRow " data-binding-show="{{ShowEMailadresse}}" >
<i class="icon-envelope"></i>&nbsp;&nbsp;<a href="mailto:{{EMailadresse}}">{{EMailadresse}}</a>
</div>

Is this conditional case possible at all?

Hello Andre,

This is a boolean check, depending on the data type. What data type is your {{ShowEMailadresse}} ?

1/0 tinyint

Any ideas?

0 evaluates as false and 1 as true, so this works when it is indeed a number, if it is a string "1" or "0" then both will always be true.
With strings only an empty string will evaluate to false, any other string is true. When it is a string you should use {{ShowEMailadresse == '1'}}

Thanks Teodor. I'll give it a try.