ngMeta

Dynamic meta tags in your AngularJS single page application

• Demo
• Install
• Getting Started
• Defaults
• Dynamic meta tags
• Support For Other Crawlers
• Debugging
• Websites using ngMeta
• Further reading
• Licence

Demo

vinaygopinath.github.io/ngMeta

Install

via NPM: shell npm install ng-meta --save

via Bower: shell bower install ngMeta --save

or download the file from dist.

Getting started

1. Add ngMeta as a dependency of your module. ngMeta supports ui-router and ngRoute. js angular.module('YourApp',['ngMeta']);

2. Add meta objects to your routes (ngRoute) or states (ui-router) and specify the meta tags appropriate to each view. Other than title and titleSuffix, which are reserved properties that affect the title of the page, the tag properties can be named as per your choice. ```js .config(function ($routeProvider, ngMetaProvider) {

   $routeProvider .when('/home', { templateUrl: 'home-template.html', meta: { 'title': 'Home page', 'description': 'This is the description shown in Google search results' } }) .when('/login', { templateUrl: 'login-template.html', meta: { 'title': 'Login page', 'titleSuffix': ' | Login to YourSiteName', 'description': 'Login to the site' } }); ... }); ```

3. [Optional] Set the default values of meta tags during Angular's configuration phase. If the meta object of a route does not contain a specific tag, the default value is used instead. ```javascript //Add a suffix to all page titles ngMetaProvider.useTitleSuffix(true);

   // On /home, the title would change to // 'Home Page | Best Website on the Internet!' ngMetaProvider.setDefaultTitleSuffix(' | Best Website on the Internet!');

   //Set defaults for arbitrary tags // Default author name ngMetaProvider.setDefaultTag('author', 'John Smith'); ```

4. Let ngMeta initialize by calling the init() function in the app.js run block js angular.module('YourApp', ['ngRoute', 'ngMeta']) .config(function($routeProvider, ngMetaProvider) { .... }) .run(['ngMeta', function(ngMeta) { ngMeta.init(); }]);

5. Set the meta tags in your HTML file ```html <!-- OR {{ngMeta.title}} -->

   <!-- Arbitrary tags --> <!-- OR --> ```

Defaults

Change app-wide behaviour and set default values to tags using these methods of ngMetaProvider. These defaults can be overridden by defining equivalent properties in the route/state meta object

| Method | Default | Example | | ------ | ------- | ------- | | useTitleSuffix(boolean)Toggles the use of a title suffix. When enabled, the title suffix of the route (if available) or the default title suffix is appended to the title of all pages. | false | ngMetaProvider.useTitleSuffix(true); | | setDefaultTitle(String)Sets the default title for all routes. This serves as a fallback for routes that don't have a title property. Use this to customize titles for a few specific routes, letting other routes use the default title. | undefined | ngMetaProvider.setDefaultTitle('Spotify');ngMetaProvider.setDefaultTitle('Generic Title'); | | setDefaultTitleSuffix(String)Sets the default title suffix for all routes. This serves as a fallback for routes that don't have a titleSuffix property. The default title suffix is relevant only when useTitleSuffix is set to true. | undefined | ngMetaProvider.setDefaultTitleSuffix(' - Site Name');ngMetaProvider.setDefaultTitleSuffix(' - YourSite'); | | setDefaultTag(String, String)Sets the default value of any arbitrary tag. This serves as a fallback for routes that don't have a particular tag. | N/A | ngMetaProvider.setDefaultTag('author', 'John Smith');ngMetaProvider.setDefaultTag('ogImgUrl', 'http://example.com/img.png'); |

Dynamic meta tags

To change meta tags dynamically (when an item in a list is clicked, for example), inject the ngMeta service into your controller and use one of the following methods:

Note: Please use setTitle to modify the title and/or titleSuffix and setTag for all other tags.

| Method | Description | Example | | ------ | ------- | ------- | | setTitle(String title, String titleSuffix) | Sets the current title based on the given params. When useTitleSuffix is enabled and titleSuffix is not provided, it uses the default titleSuffix. | ngMeta.setTitle('Title', ' - TitleSuffix')ngMeta.setTitle('Title with default titleSuffix')ngMeta.setTitle('Title with no titleSuffix','') | | setTag(String tagName, String value) | Sets the value of an arbitrary tag, using the default value of the tag when the second param is missing. The value is accessible as {{ngMeta.tagName}} from HTML. Calling setTag with title or titleSuffix as tagName results in an error. Title must be modified using setTitle instead.|ngMeta.setTag('author', 'John Smith')ngMeta.setTag('ogImage', 'http://url.com/image.png')|

Support For Other Crawlers

While Google is capable of rendering Angular sites, other search engines (?) and crawler bots used by social media platforms do not execute Javascript. This affects the site snippets generated by sites like Facebook and Twitter. They may show a snippet like this one:

You can use prerendering services to avoid this issue altogether, or update the server config to generate and serve a simplified page with just the open graph meta data needed for the bots to create snippets. Michael Bromley's article, Enable Rich Sharing In Your AngularJS App has more information on how to do that.

TL;DR: ngMeta helps the Google crawler render your Angular site and read the meta tags. For other sites like Facebook/Twitter that can't render Javascript, you need to use pre-renderers or server redirects.

Debugging

• ng-inspector Chrome extension shows the tags set by ngMeta when a state/route is open

• Facebook's Open Graph Object Debugger shows detailed information about your site's meta tags as well as a preview of the snippet shown when your site is shared.

Websites using ngMeta

• acloud.guru - AWS certification online learning platform

To list your website here, please make a PR and add your URL in this section of README.md in this format "Site URL - Short description"

Further reading

• AngularJS & SEO - finally a piece of cake
• Fetch as Google - Google Webmaster Tools
• Deprecating our AJAX crawling scheme - Google Webmaster Blog
• Open Graph protocol

MIT Licence

Vinay Gopinath