@alibrate/angular-update-meta

v2.1.0

Published

3 years ago

Dynamically update meta tags and document title for SEO purposes in your AngularJS application.

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Update meta tags in AngularJS

Dynamically update meta tags and document title for SEO purposes in your AngularJS application.

lightweight (< 1KB)
uses original meta syntax
supports prerender.io for SEO purposes
supports Open Graph protocol meta elements
supports schema.org protocol meta elements
supports link elements
update your document title dynamically
update your meta tags depending on the state your application is in
no additional scripting required, works out-of-the-box!

View example plunk right here.

Usage

First install the module using bower:

$ bower install angular-update-meta

then add the updateMeta module to the dependencies of your AngularJS application module:

angular.module('yourApp', ['updateMeta']);

Suppose you have the following markup in your template:

<html>
  <head>
    <title>Website title</title>
    <meta charset="utf-8" />
    <meta http-equiv="Content-Language" content="en" />
    <meta name="description" content="Application wide description" />
    <meta property="og:title" content="The Rock" />
    <meta itemprop="description" content="Application wide description for Schema.org (Google+ uses this)">
    <script type="application/ld+json"></script>
  </head>
  <body ng-app="yourApp">
    ...
  </body>
</html>

Now you can use the following markup in your view(s):

<update-title title="A new title"></update-title>
<update-meta charset="ISO-8859-1"></update-meta>
<update-meta http-equiv="Content-Language" content="es"></update-meta>
<update-meta name="description" content="A page specific description"></update-meta>
<update-meta property="og:title" content="Minions"></update-meta>
<update-meta itemprop="description" content="A page specific itemprop description"></update-meta>
<update-script content="structuredData" type="application/ld+json"></update-script>

And if you want to use Google Structured Data, create an object like this in $scope:

$scope.structuredData = {
  "@context": "http://schema.org",
  "@type": "Organization",
  "url": "http://www.example.com",
  "name": "Unlimited Ball Bearings Corp.",
  "contactPoint": {
    "@type": "ContactPoint",
    "telephone": "+1-401-555-1212",
    "contactType": "Customer service"
  }
};

So the head is updated to:

<html>
  <head>
    <title>A new title</title>
    <meta charset="ISO-8859-1" />
    <meta http-equiv="Content-Language" content="es" />
    <meta name="description" content="A page specific description" />
    <meta property="og:title" content="Minions" />
    <meta itemprop="description" content="A page specific itemprop description">
    <script type="application/ld+json">
    {
      "@context": "http://schema.org",
      "@type": "Organization",
      "url": "http://www.example.com",
      "name": "Unlimited Ball Bearings Corp.",
      "contactPoint": {
        "@type": "ContactPoint",
        "telephone": "+1-401-555-1212",
        "contactType": "Customer service"
      }
    }
    </script>
  </head>
  <body ng-app="yourApp">
    ...
  </body>
</html>

Only existing meta elements are updated.

If the meta element does not exist yet, it is NOT added, so make sure they exist in your original head element.

Whenever an update-meta element is processed, the original meta in the head is updated with the new value.

This allows you to dynamically set the meta element values with values from within your markup and child states.

You can also update link tags. If you have the following markup in your layout:

<html>
  <head>
    <link rel="stylesheet" href="http://example.com" />
    <link rel="alternate" href="http://example.com/another" hreflang="" />
    <link rel="alternate" href="http://example.com/another" id="test" />
  </head>
</html>

and you have the following markup in your view:

<update-link rel="stylesheet" href="http://example.com/updated"></update-link>
<update-link rel="alternate" href="http://example.com/another" hreflang="es"></update-link>
<update-link rel="alternate" href="http://example.com/another-updated" id="test"></update-link>

then the head will be updated to:

<html>
  <head>
    <link rel="stylesheet" href="http://example.com/updated" />
    <link rel="alternate" href="http://example.com/another" hreflang="es" />
    <link rel="alternate" href="http://example.com/another-updated" id="test" />
  </head>
</html>

A rel and a href attribute must be supplied to the directive. The directive will try querying the DOM using the rel and href attributes, and optionally an id. Any of the supported attributes (id, charset, crossorigin, hreflang, integrity, media, methods, referrerpolicy, sizes, target, title, type) will be updated.

Expressions

Dynamic AngularJS expressions are supported too:

<update-meta property="og:title" content="{{ title }}"></update-meta>

In the example above, the og:title is automatically updated whenever title changes.

Prerender.io

Prerender.io will grab the updated values and store them in your page snapshots so they are optimized for SEO purposes.

This allows you to conveniently update the meta elements for each individual page in your AngularJS single page application and store them correctly in your Prerender page snapshots.

You can preview the prerender output by using the _escaped_fragment_= parameter as described in the prerender.io documentation.

Contribute

To update the build in the dist directory:

$ gulp

To run the unit tests (for both concatenated and minified version):

$ gulp test

Change log

2.1.0

added support for Google Structured Data (credits to Mostafa Shaheydari)

2.0.1

fix issue with link #28 (credits to Kohei Hisakuni)

2.0.0

added support for link elements #18

1.9.0

added support for itemprop (thank you @urbgimtam)
added examples for itemprop

1.8.0

added examples for use with ngRoute and ui-router

v1.7.1

fixed bower dependencies

v1.7.0

added update-title directive
updated documentation
updated example

v1.6.0

added dynamic tag support
updated documentation
updated example

v1.5.1

fixed issue with http-equiv
updated documentation
updated example

v1.5.0

added support for meta property elements to support the Open Graph protocol

v1.4.0

switch to native element.querySelector() method to fix #4

v1.3.0

added double quotes to support #2

v1.2.1

fix bower ignore files

v1.2.0

update bower ignore files

v1.1.0

add travis support
update documentation

v1.0.0

refactor to support original markup
add unit tests
update documentation

v0.1.0

Initial version