angularjs - Class directive not working when using ng-class with condition -


i tried load directive below not working. 

<div ng-class="{'nav-dropdown' : dt.url == null }"> </div>

it works fine if assigned class this:

<div class="nav-dropdown"> </div>

edit:

when using method:

<div ng-class="{'nav-dropdown' : dt.url == null }"> </div>

the class added inside html as

<div class="nav-dropdown"> </div>

the main problem : directive doesn't show 

 <div class="nav-dropdown"><div>this directive template</div></div>

what want load directive condition: dt.url null. can help?

you can use ternary expression 

<ng-class="condition ? 'true' : 'false'"></div>

so, instead use this:

<div ng-class="{'nav-dropdown' : dt.url == null }"> </div>

you use this: (this works me)

<div ng-class="dt.url == null ? 'nav-dropdown' : ''"></div>

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