How to execute AngularJS controller function on page load?

How to Execute AngularJS Controller Function on Page Load?

👋 Hey there AngularJS enthusiasts! We receive a lot of questions from our readers, and one that caught our attention recently was about executing AngularJS controller functions on page load. 📜🚀

So let's dive in and tackle this common issue together! 💪

🔍 Understanding the Problem The user wanted to display search results automatically when returning to the Angular.js search page after clicking the back button. The search results were originally displayed by clicking a search button, and the URL was updated with the search term.

💡 The Solution To trigger the search function to execute automatically on page load, we can leverage AngularJS's powerful built-in directives and lifecycle hooks.

1. Access Your Controller

First, make sure you have assigned your controller to the relevant element or component in your HTML code. For example:

<div ng-controller="SearchController">
  <!-- Your search page content here -->
</div>

1. Define a Function

Next, define a function in your controller that performs the search. This function will be called automatically on page load. For example:

app.controller('SearchController', function($scope) {
  $scope.search = function() {
    // Your search logic here
  };
});

1. Execute the Function

To execute the search function automatically on page load, we can utilize the $scope's lifecycle hook method called $watch. This method allows us to monitor changes in a specific variable or expression. In this case, we will use $watch to detect changes in the URL search term. Here's an example:

app.controller('SearchController', function($scope, $location) {
  $scope.$watch(function() {
    return $location.search().q; // 'q' might be your URL parameter name
  }, function(newVal, oldVal) {
    if (newVal !== oldVal) { // Check if the search term has changed
      $scope.search(); // Execute the search function
    }
  });
});

📢 Call-to-Action There you have it – an easy solution to execute an AngularJS controller function on page load! Now your search results will be displayed automatically when the user returns to the search page. ⚡💥

We hope this guide was helpful to you! If you have any further questions, feel free to leave a comment below. And don't forget to share this post with your fellow AngularJS developers who might also find it useful. 💡🚀

Keep spreading the AngularJS love! 😄❤️