Can functions be passed to an AngularJS directive in a bulk?

Question

Can functions be passed to an AngularJS directive in a bulk?

I am currently working on a custom dropdown menu directive that allows the attachment of functions to each item in the list. While I know how to pass one function per attribute into the directive, I am curious if there is a way to pass multiple functions instead.

<dropdown items="['item1', 'item2']" actions="['action1()', 'action2()']"></dropdown>

Alternatively:

<dropdown items="[{'item1':action1()}, {'item2':action2()}]"></dropdown>

This would allow for:

<dropdown items="['item1', 'item2']" actions="['action1()', 'action2()']">
    <a ng-click="action1()">item1</a>
    <a ng-click="action2()">item2</a>
</dropdown>

javascript angularjs angularjs-directive angularjs-scope

Answer 1

Answer №1

Utilize the = object notation to define the scope when incorporating an array containing objects with specific properties that can be linked to your custom directive.

VIEW DEMO

Controller Section:

 .controller('Ctrl', function($scope) {

    var performAction = function() {
      window.alert(this.label);
    };

    $scope.items = [{
      label: 'Item 1',
      action: performAction
    }, {
      label: 'Item 2',
      action: performAction
    }, {
      label: 'Item 3',
      action: performAction
    }, {
      label: 'Item 4',
      action: performAction
    }];
  })

Custom Directive Setup:

 .directive('dropdown', function() {
    return {
      restrict: 'E',
      scope: {
        items: '='
      },
      template: 
        '<div ng-repeat="item in items track by $index" ng-click="item.action()">' + 
          '<a ng-bind="item.label"></a>' +
        '</div>'
    };
  });

HTML Implementation in index.html:

 <body ng-controller="Ctrl">
    <dropdown items="items"></dropdown>
  </body>

Answer 2

Utilize the = object notation to define the scope when incorporating an array containing objects with specific properties that can be linked to your custom directive.

VIEW DEMO

Controller Section:

 .controller('Ctrl', function($scope) {

    var performAction = function() {
      window.alert(this.label);
    };

    $scope.items = [{
      label: 'Item 1',
      action: performAction
    }, {
      label: 'Item 2',
      action: performAction
    }, {
      label: 'Item 3',
      action: performAction
    }, {
      label: 'Item 4',
      action: performAction
    }];
  })

Custom Directive Setup:

 .directive('dropdown', function() {
    return {
      restrict: 'E',
      scope: {
        items: '='
      },
      template: 
        '<div ng-repeat="item in items track by $index" ng-click="item.action()">' + 
          '<a ng-bind="item.label"></a>' +
        '</div>'
    };
  });

HTML Implementation in index.html:

 <body ng-controller="Ctrl">
    <dropdown items="items"></dropdown>
  </body>

Answer 3

Answer №2

When passing a function to a directive for callback execution, follow the steps below:

Start by using 'return scope' to store the functionName as '&' which is commonly used in passing functions.
When returning it back, ensure the template looks something like this: ng-click='functionName({params:values[,params2:value2]})'

The above method will send the parameters as arguments to the calling controller that invokes the directive.

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

app.controller('MainCtrl', function($scope) {
  $scope.name = 'World';
  
  $scope.items=['value1','value2','value3'];
  $scope.items2=['value12','value22','value32'];
  
  $scope.clicked='';
  
  $scope.alert=function(val){
    $scope.clicked=val;
  }
  
   $scope.alerti=function(val){
  $scope.clicked=val+"-Second";
  }
  
});

app.directive('direct', function(){
  return {
        restrict: 'E',
        scope : {
          actionTest:'&',
          tests:'='
        },
       // controller: 'ctrl',
        template: '<ul><li ng-repeat="test in tests" ng-click="actionTest({val:test})">{{test}} </li></ul>'
  }
});
/*
app.controller('ctrl', function($scope){
  
});*/

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="testApp">
<div  ng-controller="MainCtrl">
    <p>Hello {{name}}!</p>
    <p>CLicked : {{clicked}}</p>
    
    <direct tests='items' action-test='alert(val)'></direct>
  
    <!--with a different action function-->
     <direct tests='items2' action-test='alerti(val)'></direct>
 
  </div>
</div>

Answer 4

When passing a function to a directive for callback execution, follow the steps below:

Start by using 'return scope' to store the functionName as '&' which is commonly used in passing functions.
When returning it back, ensure the template looks something like this: ng-click='functionName({params:values[,params2:value2]})'

The above method will send the parameters as arguments to the calling controller that invokes the directive.

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

app.controller('MainCtrl', function($scope) {
  $scope.name = 'World';
  
  $scope.items=['value1','value2','value3'];
  $scope.items2=['value12','value22','value32'];
  
  $scope.clicked='';
  
  $scope.alert=function(val){
    $scope.clicked=val;
  }
  
   $scope.alerti=function(val){
  $scope.clicked=val+"-Second";
  }
  
});

app.directive('direct', function(){
  return {
        restrict: 'E',
        scope : {
          actionTest:'&',
          tests:'='
        },
       // controller: 'ctrl',
        template: '<ul><li ng-repeat="test in tests" ng-click="actionTest({val:test})">{{test}} </li></ul>'
  }
});
/*
app.controller('ctrl', function($scope){
  
});*/

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="testApp">
<div  ng-controller="MainCtrl">
    <p>Hello {{name}}!</p>
    <p>CLicked : {{clicked}}</p>
    
    <direct tests='items' action-test='alert(val)'></direct>
  
    <!--with a different action function-->
     <direct tests='items2' action-test='alerti(val)'></direct>
 
  </div>
</div>

Can functions be passed to an AngularJS directive in a bulk?

Answer №1

Answer №2

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