What could be causing ngif to disregard priority levels?

I have developed a unique custom directive with a priority of 1000. Within the compile function of the directive, I am removing the ng-if attribute from the element. My belief is that since ng-if has a lower priority of 600, it should not undergo compilation.

app.js

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {

});
app.directive('myDirective', function(){
  return {
    priority: 1000,
    compile: function(element){
      angular.element(element).removeAttr('ng-if').removeAttr('my-directive1');
    }
  };
});
app.directive('myDirective1', function(){
  return {
    compile: function(){
      console.log('in mydirective1');
    }
  };
});

index.html

<div my-directive ng-if="false" my-directive1>
  This div should be visible.
</div>

To test my assumption about priorities, I have created another custom directive. While myDirective successfully removes myDirective1, it does not remove ngIf.

Here is the link to the Plunker for further exploration:

https://plnkr.co/edit/86mauwbt5I2aV4aoySpz?p=preview

Answer №1

I'm puzzled by the behavior of priorities in directives. One solution could be to utilize the terminal property in the directive along with the use of the terminal attribute to eliminate lower priority directives. You can find an updated version on Plunker.

app.directive('myDirective', function(){
  return {
    priority: 1000,
    terminal: true,
    compile: function(element){
      //element.removeAttr('ng-if').removeAttr('my-directive1');
    }
  };
});

For more insights on the terminal property, check out these resources:

  • How to understand the `terminal` of directive?
  • Why use terminal: true instead of removing lower priority directives?

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