Using parameters in a directive to invoke a function in an Angular controller's scope

This question presents a unique scenario as it involves calling a controller's functions with parameters that are only accessible within a directive.

Directive (markup):

<div do-something="doSomething(x)"></div>

Directive (JavaScript):

var directive = function () {
    return {
        restrict: 'EA',
        templateUrl: '/angular/node-for-detail.html',
        scope: {
            doSomething: '&'
        }
    }
};

Markup inside the directive:

<span ng-click="doSomething('im not resolving')"></span>

Function inside the controller:

$scope.doSomething = function(myVar) { //myVar is null };

The issue here is that while param.abs is resolved correctly within the directive, the parameters appear as null within the called scope function. What could be causing this problem? How can the parameter successfully pass through?

Answer №1

To ensure consistency, it is important to establish a standard parameter name for the function specified in the markup (for example, using x as shown in your example). Create a function within the directive's isolate scope that will invoke the doSomething() method like this:

Directive link function:

$scope.runCallback = function (param) {
    $scope.doSomething({x: param});
}

Update the markup inside the directive to:

<span ng-click="runCallback('I am not resolving')"></span>

With these changes, both the markup call (

<div do-something="doSomething(x)"></div>
) and the controller function should now function correctly.

Answer №2

Consider changing the content within the directive to this:

<span ng-click="performAction()('not resolving as expected')"></span>

Also, update the directive markup to:

<div perform-action="performAction"></div>

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