angularjsHow do I use the emit function in AngularJS?

The emit function in AngularJS is a part of the event system and is used to send data from a child scope to a parent scope. It is typically used to communicate between controllers and directives.

Example code

// in the parent controller
$scope.$on('myEvent', function(event, data) {
  console.log(data);
});

// in the child controller
$scope.$emit('myEvent', {message: 'Hello world!'});

Output example

{message: 'Hello world!'}

The code above demonstrates how to use the emit function. The $on function is used to listen for the event in the parent controller, and the $emit function is used to send the event from the child controller. The $emit function takes two arguments: the name of the event and the data to be sent.

Code explanation

• $scope.$on('myEvent', function(event, data) {}) - this is used to listen for the event in the parent controller. The $on function takes two arguments: the name of the event and a callback function which is passed the event object and the data sent from the child controller.

• $scope.$emit('myEvent', {message: 'Hello world!'}) - this is used to send the event from the child controller. The $emit function takes two arguments: the name of the event and the data to be sent.

Helpful links

• AngularJS Event System
• AngularJS $emit
• AngularJS $on

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