CODEWITHSUNDEEP
javascriptangularjsscopedirective
I159
I159

Reputation: 31189

Angularjs: how to pass scope variables to a directive?

I am trying to use directive to create and append several tags to a <div> as shown below:

module.directive('createControl', function(){
  return function(scope, element, attrs){    
    console.log(attrs.createControl); // undefined     
  }                                          
});                                         


<div class="control-group" ng-repeat="(k, v) in selectedControls">
  <div create-control="{{ v.type }}"></div>
</div>

In attrs I have this construction:

$$element: b.fn.b.init[1]
$$observers: Object
$attr: Object
createControl: "date"
style: "margin-right: 15px"
__proto__: Object

But when I try to use attrs.createControl I get undefined and I do not understand why. Actual question: how to pass scope variable to a directive?

Upvotes: 27

Views: 50342

Answers (3)

Joe Hanink
Joe Hanink

Reputation: 4857

    app.directive('createControl', function() {
      return {
        scope: {
          createControl:'='
        },
        link: function(scope, element, attrs){    
           element.text(scope.createControl);    
        }      
      }
    })  

  <div class="control-group" ng-repeat="v in [{type:'green'}, {type:'brown'}]">
    <div create-control="v.type"></div>
   </div>

Upvotes: 34

charlietfl
charlietfl

Reputation: 171700

Read Attributes/observing interpolated attributes section of the directive docs. During the link phase the attributes haven't been set.

There are several ways including using attrs.$observe or $timeout.

app.directive('createControl', function($timeout){
 return function(scope, element, attrs){
      attrs.$observe('createControl',function(){
        console.log(' type:',attrs.createControl);
         element.text('Directive text, type is: '+attrs.createControl);
      });
  }
}) ;

DEMO

Upvotes: 15

Mark Rajcok
Mark Rajcok

Reputation: 364727

If v.type may change (i.e., you really need to use interpolation -- the {{}}s), use @charlietfl's or @Joe's answser, depending on the type of scope you want your directive to have.

If v.type will not change (i.e., your link function only needs to get the values once, and those values are guaranteed to be set when your link function runs), you can use $parse or $eval instead. This has a slight performance advantage in that no $watches are created. (With $observe() and =, Angular sets up $watches, which are evaluated every digest cycle.)

<div create-control="v.type"></div>

app.directive('createControl', function ($parse) {
    return function (scope, element, attrs) {
        console.log('$eval type:', scope.$eval(attrs.createControl));
        var type = $parse(attrs.createControl)(scope);
        console.log('$parse type:', type);
        element.text('Directive text, type is: ' + type);
    }
});

demo

Upvotes: 15

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