Detect if a transclude content has been given for a angularjs directive

Question

I have a directive (a progressbar) which should have two possible states, one without any description and one with a label on the left side. It would be cool to simple use

Answer 1

After release of Angular v1.5 with multi-slot transclusion it's even simpler. For example you have used component instead of directive and don't have access to link or compile functions. Yet you have access to $transclude service. So you can check presence of content with 'official' method:

app.component('myTransclude', {
  transclude: {
    'slot': '?transcludeSlot'
  },
  controller: function ($transclude) {
    this.transcludePresent = function() {
      return $transclude.isSlotFilled('slot');
    };
  }
})

with template like this:

    

    
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