angularjs directive call function specified in attribute and pass an argument to it

Question

I want to create a directive that links to an attribute. The attribute specifies the function that should be called on the scope. But I also want to pass an argument to the

Answer 1

Not knowing exactly what you want to do... but still here's a possible solution.

Create a scope with a '&'-property in the local scope. It "provides a way to execute an expression in the context of the parent scope" (see the directive documentation for details).

I also noticed that you used a shorthand linking function and shoved in object attributes in there. You can't do that. It is more clear (imho) to just return the directive-definition object. See my code below.

Here's a code sample and a fiddle.

<div ng-app="myApp">
<div ng-controller="myController">
    <div my-method='theMethodToBeCalled'>Click me</div>
</div>
</div>

<script>

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

   app.directive("myMethod",function($parse) {
       var directiveDefinitionObject = {
         restrict: 'A',
         scope: { method:'&myMethod' },
         link: function(scope,element,attrs) {
            var expressionHandler = scope.method();
            var id = "123";

            $(element).click(function( e, rowid ) {
               expressionHandler(id);
            });
         }
       };
       return directiveDefinitionObject;
   });

   app.controller("myController",function($scope) {
      $scope.theMethodToBeCalled = function(id) { 
          alert(id); 
      };
   });

</script>

Answer 2

Here's what worked for me.

Html using the directive

 <tr orderitemdirective remove="vm.removeOrderItem(orderItem)" order-item="orderitem"></tr>

Html of the directive: orderitem.directive.html

<md-button type="submit" ng-click="remove({orderItem:orderItem})">
       (...)
</md-button>

Directive's scope:

scope: {
    orderItem: '=',
    remove: "&",

Answer 3

My solution:

1. on polymer raise an event (eg. complete)
2. define a directive linking the event to control function

Directive

/*global define */
define(['angular', './my-module'], function(angular, directives) {
    'use strict';
    directives.directive('polimerBinding', ['$compile', function($compile) {

            return {
                 restrict: 'A',
                scope: { 
                    method:'&polimerBinding'
                },
                link : function(scope, element, attrs) {
                    var el = element[0];
                    var expressionHandler = scope.method();
                    var siemEvent = attrs['polimerEvent'];
                    if (!siemEvent) {
                        siemEvent = 'complete';
                    }
                    el.addEventListener(siemEvent, function (e, options) {
                        expressionHandler(e.detail);
                    })
                }
            };
        }]);
});

Polymer component

<dom-module id="search">

<template>
<h3>Search</h3>
<div class="input-group">

    <textarea placeholder="search by expression (eg. temperature>100)"
        rows="10" cols="100" value="{{text::input}}"></textarea>
    <p>
        <button id="button" class="btn input-group__addon">Search</button>
    </p>
</div>
</template>

 <script>
  Polymer({
    is: 'search',
            properties: {
      text: {
        type: String,
        notify: true
      },

    },
    regularSearch: function(e) {
      console.log(this.range);
      this.fire('complete', {'text': this.text});
    },
    listeners: {
        'button.click': 'regularSearch',
    }
  });
</script>

</dom-module>

Page

 <search id="search" polimer-binding="searchData"
 siem-event="complete" range="{{range}}"></siem-search>

searchData is the control function

$scope.searchData = function(searchObject) {
                    alert('searchData '+ searchObject.text + ' ' + searchObject.range);

}

Answer 4

Marko's solution works well.

To contrast with recommended Angular way (as shown by treeface's plunkr) is to use a callback expression which does not require defining the expressionHandler. In marko's example change:

In template

<div my-method="theMethodToBeCalled(myParam)"></div>

In directive link function

$(element).click(function( e, rowid ) {
  scope.method({myParam: id});
});

This does have one disadvantage compared to marko's solution - on first load theMethodToBeCalled function will be invoked with myParam === undefined.

A working exampe can be found at @treeface Plunker

Answer 5

You can create a directive that executes a function call with params by using the attrName: "&" to reference the expression in the outer scope.

We want to replace the ng-click directive with ng-click-x:

<button ng-click-x="add(a,b)">Add</button>

If we had this scope:

$scope.a = 2;
$scope.b = 2;

$scope.add = function (a, b) {
  $scope.result = parseFloat(a) + parseFloat(b);
}

We could write our directive like so:

angular.module("ng-click-x", [])

.directive('ngClickX', [function () {

  return {

    scope: {

      // Reference the outer scope
      fn: "&ngClickX",

    },

    restrict: "A",

    link: function(scope, elem) {

      function callFn () {
        scope.$apply(scope.fn());
      }

      elem[0].addEventListener('click', callFn);
    }
  };
}]);

Here is a live demo: http://plnkr.co/edit/4QOGLD?p=info

Answer 6

This should work.

<div my-method='theMethodToBeCalled'></div>

app.directive("myMethod",function($parse) {
  restrict:'A',
  scope: {theMethodToBeCalled: "="}
  link:function(scope,element,attrs) {
     $(element).on('theEvent',function( e, rowid ) {
        id = // some function called to determine id based on rowid
        scope.theMethodToBeCalled(id);
     }
  }
}

app.controller("myController",function($scope) {
   $scope.theMethodToBeCalled = function(id) { alert(id); };
}