Check existence of attribute in AngularJs Directive

Question

Is is possible to check whether a given attribute is present in a directive, ideally using isolate scope or in a worst case scenario the attributes object.

With a direct

Answer 1

Since the attrs value is type of javascript object. To check attribute existence we can also using hasOwnProperty() method instead in keyword.

So, it could be :

link: function(scope, element, attrs) {
  var is_key_exist = attrs.hasOwnProperty('status');//Will return true if exist
}

You can read further the difference between in keyword and hasOwnProperty() method at this link