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问题:

I want to override directive ng-click: to some make some $rootscope changes before each execution of ng-click. How to do it?

回答1:

You can't override AngularJS built-in directives. However, you can define multiple directives with the same name and have them executed against the same element. By assigning appropriate priority to your directive, you can then control whether your directive runs before or after a built-in directive.

This plunker shows how to build an ng-click directive that executes before the built-in ng-click does. The code is also shown below. When clicking the link, the custom ng-click will run first, then the built-in ng-click does.

index.html

<!DOCTYPE html>
<html ng-app="app">

  <head>
    <script data-require="jquery@1.9.0" data-semver="1.9.0" src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.9.0/jquery.js"></script>
    <script data-require="angular.js@1.0.7" data-semver="1.0.7" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js"></script>
    <script src="script.js"></script>
  </head>

  <body ng-controller="MyCtrl">
    <a ng-click="alert()">Click me</a>
  </body>

</html>

script.js

angular.module('app', [])
  .directive('ngClick', function($rootScope) {
      return {
        restrict: 'A',
        priority: 100, // give it higher priority than built-in ng-click
        link: function(scope, element, attr) {
          element.bind('click', function() {
            // do something with $rootScope here, as your question asks for that
            alert('overridden');
          })
        }
      }
  })
  .controller('MyCtrl', function($scope) {
    $scope.alert = function() {
      alert('built-in!')
    }
  })

回答2:

Every directive is a special service inside AngularJS, you can override or modify any service in AngularJS, including directive

For example remove built-in ngClick

angular.module('yourmodule',[]).config(function($provide){
    $provide.decorator('ngClickDirective', ['$delegate', function($delegate) {
        //$delegate is array of all ng-click directive
        //in this case first one is angular buildin ng-click
        //so we remove it.
        $delegate.shift();
        return $delegate;
    }]);
});

angular support multiple directives to the same name so you can register you own ngClick Directive

angular.module('yourmodule',[]).directive('ngClick',function (){
  return {
    restrict : 'A',
    replace : false,
    link : function(scope,el,attrs){
      el.bind('click',function(e){
        alert('do you feeling lucky');
      });
    }
  }
});

check out http://plnkr.co/edit/U2nlcA?p=preview I wrote a sample that removed angular built-in ng-click and add a customized ngClick