angularjs,angularjs-directive,angularjs-scope , Confuse about the AngularJS scope when multiple directives share same element


Confuse about the AngularJS scope when multiple directives share same element

Question:

Tag: angularjs,angularjs-directive,angularjs-scope

All:

I'm new to AngularJS directive scope and I want to know how AngularJS deals with scope when multiple isolated-scope directives are assigned to teh same element.

For example:

app.controller("main", function($scope){
    $scope.data = [
        {
            id:"id_1"
        },
        {
            id:"id_2"
        },
        {
            id:"id_3"
        },
        {
            id:"id_4"
        }
    ];
});

app.directive("isodir", function(){
    return {
        restrict:"AE",
        scope: {},
        controller: function($scope){$scope.d = {id:"isodir_id"} },
        link: function(scope, EL, attrs){}
    }
});

The HTML part is:

<isodir ng-repeat="d in data track by $index">{{d.id}}</isodir>

<isodir>{{d.id}}</isodir>

There are mainly two questions that confused me so much:

[1] For the html part[1]: the one with ng-repeat, could anyone give me some explanation on how AngularJS decides whose scope to use, because ng-repeat and isodir are both isolated scope(according to the result, but it turns out that ng-repeat scope get applied and I want to know why not isodir is applied); sometimes if I use two directives both with isolated scopes, AngularJS will report error. But the ng-repeat does not report error.

[2] For the html part[2]: the one without ng-repeat, let us say that I just accept the fact about part[1] without any doubt, then it means that the d inside ng-repeat scope gets rendered to {{d.id}}, but in part[2], I define $scope.d inside isodir controller, but why this d can not be useed as value of {{d.id}}

Thanks


Answer:

1) It will be something to do with $compile order which where directive with higher priority will be executed first. ngRepeat has priority of 1000 which is higher than custom directive which is 0. But for your case it is due to ng-bind-html {{d.id}} that you use will not work for custom directive because you have an isolate scope so it expects that {{d.id}} will be bound inside the directive template and not outside of it. I.e using template or templateUrl.

Check 1st plunkr which is fixed version of your directive

app.directive('isodir', function(){
return {
    restrict:"AE",
    priority: 0,
    template: "{{d.id}}",
    scope: {},
    controller: function($scope){$scope.d = {id:"isodir_id"} }
}
});

http://plnkr.co/edit/3noKzbJGMav7MBozW4i0?p=preview

As you can see the result is isodir as it is the latest being compile thus override ng-repeat d scope.

Compare it with 2nd plunkr which custom directives has higher priority than ngRepeat

app.directive('isodir', function(){
return {
    restrict:"AE",
    priority: 100000,
    template: "{{d.id}}",
    scope: {},
    controller: function($scope){$scope.d = {id:"isodir_id"} }
}
});

http://plnkr.co/edit/1RhF0LpvfBOaVPZju6Fr?p=preview

As you can see ng-repeat override {{d.id}} to use ngRepeat scope object.

2) As explained above, it is due to isolated scope. If you want to use {{d.id}} in your custom directive without template / template URL then you have to remove isolated scope.


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