Accessing attributes from an AngularJS directive

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See section Attributes from documentation on directives.

observing interpolated attributes: Use $observe to observe the value changes of attributes that contain interpolation (e.g. src=”https://stackoverflow.com/questions/11913841/{{bar}}”). Not only is this very efficient but it’s also the only way to easily get the actual value because during the linking phase the interpolation hasn’t been evaluated yet and so the value is at this time set to undefined.

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