How to execute AngularJS controller function on page load ?

Last Updated : 08 Sep, 2022

In this article, we will see how to execute/call a JS function on page load using AngularJS. This function can be used to perform initialization. Calling a function or initializing a single value on page load in AngularJS is quite easy. AngularJS provides us with a dedicated directive for this specific task. It's the ng-init directive.

Syntax:

<element ng-init="function()">       Contents...   </element>

Example 1: In this example, we will call a function to initialize a variable on page load.

HTML

<!DOCTYPE html> <html ng-app="myApp">  <head>     <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.7.8/angular.min.js">     </script> </head>  <body ng-controller="MyController">        <!-- calling the firstFunction to         initialize gfg variable -->     <center ng-init="firstFunction(this)">                <!-- gfg variable with no value initially -->         <h1 style="color: green;">{{gfg}}</h1>     </center> </body>  <script type="text/javascript">     var myApp = angular.module('myApp', []);     myApp.controller('MyController',                       ['$scope', function($scope) {              // Function to be called on page load         $scope.firstFunction = function($scope) {                        // We need $scope argument as we are             // altering the variables defined in             // the $scope             $scope.gfg = "GeeksForGeeks"         }     }]); </script> </html>

Output: The function is called on page load and the value of variable gfg is set to GeeksForGeeks. Function Call on Page Load AngularJS output

Example 2: In this example, we will assign an object to the variable gfg and use it.

HTML

<!DOCTYPE html> <html ng-app="myApp">  <head>     <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.7.8/angular.min.js">     </script> </head>  <body ng-controller="MyController">      <!-- Calling the firstFunction to         initialize gfg variable -->     <center ng-init="firstFunction(this)">          <!-- gfg variable as an object -->         <h1 style="color: green;">{{gfg.name}}</h1>         <h3 style="color: green;">{{gfg.location}}</h3>     </center> </body>  <script type="text/javascript">     var myApp = angular.module('myApp', []);     myApp.controller('MyController', ['$scope',      function($scope) {              // Function to be called on page load         $scope.firstFunction = function($scope) {                  // We need $scope argument as we are             // altering the variables defined in             // the $scope                  // Assigning an object to the gfg variable             $scope.gfg = {                 name: "GeeksForGeeks",                 location: "India"             }         }     }]); </script> </html>

Output: The variable "gfg" is initialized successfully.

GFG as an object output

Example 3: In this example, we will directly initialize a variable from the ng-init directive.

HTML

<!DOCTYPE html> <html ng-app="myApp">  <head>     <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.7.8/angular.min.js">     </script> </head>  <body ng-controller="MyController">      <!-- initializing the gfg variable to         'GeeksForGeeks' -->     <center ng-init="gfg='GeeksForGeeks'">         <h1 style="color: green;">{{gfg}}</h1>     </center> </body>  <script type="text/javascript">     var myApp = angular.module('myApp', []);     myApp.controller('MyController',                       ['$scope', function($scope) {          }]); </script>  </html>

Output: The variable gfg is assigned the value "GeeksForGeeks" on page load. init value on Page Load AngularJS output

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How to execute AngularJS controller function on page load ?

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