Duke Dougal Duke Dougal - 23 days ago 5
AngularJS Question

How to execute angular controller function on page load?

Currently I have an Angular.js page that allows searching and displays results. User clicks on a search result, then clicks back button. I want the search results to be displayed again but I can't work out how to trigger the search to execute. Here's the detail:


  • My Angular.js page is a search page, with a search field and a search
    button. The user can manually type in a query and press a button and
    and ajax query is fired and the results are displayed. I update the URL with the search term. That all works fine.

  • User clicks on a result of the search and is taken to a different page - that works fine too.

  • User clicks back button, and goes back to my angular search page, and the correct URL is displayed, including the search term. All works fine.

  • I have bound the search field value to the search term in the URL, so it contains the expected search term. All works fine.



How do I get the search function to execute again without the user having to press the "search button"? If it was jquery then I would execute a function in the documentready function. I can't see the Angular.js equivalent.

Answer

On the one hand as @Mark-Rajcok said you can just get away with private inner function:

// at the bottom of your controller
var init = function () {
   // check if there is query in url
   // and fire search in case its value is not empty
};
// and fire it after definition
init();

Also you can take a look at ng-init directive. Implementation will be much like:

// register controller in html
<div data-ng-controller="myCtrl" data-ng-init="init()"></div>

// in controller
$scope.init = function () {
    // check if there is query in url
    // and fire search in case its value is not empty
};

But take care about it as angular documentation implies (since v1.2) to NOT use ng-init for that. However imo it depends on architecture of your app.

I used ng-init when I wanted to pass a value from back-end into angular app:

<div data-ng-controller="myCtrl" data-ng-init="init('%some_backend_value%')"></div>
Comments