2012-02-25 00:14:44 +00:00
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@ngdoc overview
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@name Developer Guide: Bootstrap
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@description
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# Overview
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This page explains the Angular initialization process and how you can manually initialize Angular
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if necessary.
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# Angular `<script>` Tag
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This example shows the recommended path for integrating Angular with what we call automatic
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initialization.
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<pre>
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<!doctype html>
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<html xmlns:ng="http://angularjs.org" ng-app>
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<body>
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...
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<script src="angular.js">
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</body>
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</html>
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</pre>
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2012-08-05 19:16:37 +00:00
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* Place the `script` tag at the bottom of the page. Placing script tags at the end of the page
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2012-08-08 14:12:54 +00:00
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improves app load time because the HTML loading is not blocked by loading of the `angular.js`
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2012-02-25 00:14:44 +00:00
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script. You can get the latest bits from {@link http://code.angularjs.org}. Please don't link
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your production code to this URL, as it will expose a security hole on your site. For
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experimental development linking to our site is fine.
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* Choose: `angular-[version].js` for a human-readable file, suitable for development and
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debugging.
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* Choose: `angular-[version].min.js` for a compressed and obfuscated file, suitable for use in
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production.
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* Place `ng-app` to the root of your application, typically on the `<html>` tag if you want
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2012-08-05 19:16:37 +00:00
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angular to auto-bootstrap your application.
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2012-02-25 00:14:44 +00:00
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<html ng-app>
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2012-07-12 02:27:13 +00:00
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* If you choose to use the old style directive syntax `ng:` then include xml-namespace in `html`
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2012-08-05 19:16:37 +00:00
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to make IE happy. (This is here for historical reasons, and we no longer recommend use of
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2012-02-25 00:14:44 +00:00
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`ng:`.)
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2012-06-12 06:49:24 +00:00
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2012-02-25 00:14:44 +00:00
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<html xmlns:ng="http://angularjs.org">
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2012-06-12 06:49:24 +00:00
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2012-02-25 00:14:44 +00:00
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# Automatic Initialization
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2013-02-06 11:15:18 +00:00
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Angular initializes automatically upon `DOMContentLoaded` event or when the `angular.js` script is
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evaluated if at that time `document.readyState` is set to `'complete'`. At this point Angular looks
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for the {@link api/ng.directive:ngApp `ng-app`} directive which designates your application root.
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If the {@link api/ng.directive:ngApp `ng-app`} directive is found then Angular will:
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2012-02-25 00:14:44 +00:00
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* load the {@link guide/module module} associated with the directive.
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2012-06-12 06:49:24 +00:00
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* create the application {@link api/AUTO.$injector injector}
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* compile the DOM treating the {@link api/ng.directive:ngApp
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2012-02-25 00:14:44 +00:00
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`ng-app`} directive as the root of the compilation. This allows you to tell it to treat only a
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portion of the DOM as an Angular application.
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2012-06-12 06:49:24 +00:00
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2012-02-25 00:14:44 +00:00
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<pre>
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<!doctype html>
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<html ng-app="optionalModuleName">
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<body>
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I can add: {{ 1+2 }}.
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<script src="angular.js"></script>
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</body>
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</html>
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</pre>
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# Manual Initialization
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If you need to have more control over the initialization process, you can use a manual
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bootstrapping method instead. Examples of when you'd need to do this include using script loaders
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2012-07-12 02:27:13 +00:00
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or the need to perform an operation before Angular compiles a page.
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2012-02-25 00:14:44 +00:00
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Here is an example of manually initializing Angular. The example is equivalent to using the {@link
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2012-06-12 06:49:24 +00:00
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api/ng.directive:ngApp ng-app} directive.
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2012-02-25 00:14:44 +00:00
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<pre>
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<!doctype html>
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<html xmlns:ng="http://angularjs.org">
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<body>
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Hello {{'World'}}!
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<script src="http://code.angularjs.org/angular.js"></script>
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<script>
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angular.element(document).ready(function() {
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angular.bootstrap(document);
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});
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</script>
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</body>
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</html>
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</pre>
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2012-07-12 02:27:13 +00:00
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This is the sequence that your code should follow:
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2012-02-25 00:14:44 +00:00
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1. After the page and all of the code is loaded, find the root of the HTML template, which is
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typically the root of the document.
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2. Call {@link api/angular.bootstrap} to {@link compiler compile} the template into an
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executable, bi-directionally bound application.
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