ember-cli-meta-tags
An Ember CLI add-on to easily set tags
(link
, meta
, script
, noscript
, etc.) in the document head.
Many social networks, sharing platforms, and search engines extract
data from <meta>
tags within a page's head tag. With this add-on,
you can have those meta tags populated when entering individual Ember
routes. This allows you to keep all logic within your client side
application without needing a sophisticated web server to populate tags
correctly.
This add-on is perfect for combining with a prerendering
server side solution such as prerender.io
or with
Ember FastBoot (FastBoot compatibility requires ember-cli-meta-tags v2+ and Ember 2.7+ (currently beta)).
Usage
Installation
In your Ember CLI project directory run:
ember install ember-cli-meta-tags
Upgrading to 5.x
Version 5.0 of this addon depends on ember-cli-head 0.4.0, which adds the requirement that the {{head-layout}}
is added once in an application-wide template (usually app/templates/application.hbs
). For more info, see the ember-cli-head 0.4 upgrade note.
Using with Ember FastBoot
Version 4.0+ of this addon is designed to work with FastBoot >= 1.0.0-rc1. If you use
an order version of fastboot stick with 3.X.
Version 2.0+ of this addon is built upon
ember-cli-head and as a
result it will work automatically out of the box with Ember FastBoot
if you are running a version of Ember >= 2.7.
Using with other ember-cli-head addons
If you are using another addon that makes use of ember-cli-head
(such as
ember-page-title), or
are directly using ember-cli-head
in your app you will need to
create a custom app/templates/head.hbs
file and include
ember-cli-meta-tag
's component:
{{head-tags headTags=model.headTags}}
Adding Tags Automatically On Transition
In order to dynamically add head tags from your routes all you need to
do is provide a headTags
property on the route. This property can
either be an array of tags, or a function which when invoked with the
route's context returns an array of tags. The head tags service will
automatically collect all head tags from the currently active routes
after transition.
Data structure
To define a head tag you will use the following structure:
{
type: 'meta',
tagId: 'meta-description-tag',
attrs: {
name: 'description',
content: model.get('description')
},
content: 'Element content here'
}
Nesting
This library supports pulling tag definitions from nested routes
without creating duplicate tags. Deeper nested routes will override
parent route tags. In order to support this you need to provide a
unique tagId
property on your tag definition. Only one tag with a
given tagId
will ever be rendered in the head.
Head Tags object
You can also define the tags by providing an object as the value for
the meta property on the route. This can either be in-lined in your
route definition, or set as a property on the route prior to
the didTransition event.
Example: static headTags property on the route
import Route from '@ember/routing/route';
export default Route.extend({
headTags: [{
type: 'meta',
tagId: 'meta-og-name',
attrs: {
property: 'og:name',
content: 'Ice-T'
}
},
{
type: 'link',
tagId: 'canonical-link',
attrs: {
rel: 'canonical',
content: 'http://mydomain.org/'
}
}]
});
Example: Setting the headTags property in afterModel
import Route from '@ember/routing/route';
export default Route.extend({
afterModel(model) {
this.setHeadTags(model);
},
setHeadTags(model) {
let headTags = [{
type: 'meta',
tagId: 'meta-description-tag',
attrs: {
name: 'description',
content: model.get('description')
}
}];
this.set('headTags', headTags);
}
});
headTags function
You can provide the headTags by implementing a headTags
method on the route
that returns the appropriate head tags.
Example:
import Route from '@ember/routing/route';
export default Route.extend({
headTags() {
let model = this.modelFor(this.routeName);
return [{
type: 'meta',
tagId: 'meta-description-tag',
attrs: {
name: 'description',
content: model.get('description')
}
}];
}
});
When you visit '/some-page' the document head tag will be updated as
follows:
<head>
<meta name='description' content='Ice-T'>
</head>
These tags will automatically be cleared when transitioning away from
this route.
Resetting Tags Outside of Transition
If you want to update the head tags for a route outside of a full
transition (perhaps due to a controller query parameter change)
you can directly call collectHeadTags
on the head-tags
service and
all of the headTags in the current route hierarchy will be re-built.
Example
import Route from '@ember/routing/route';
export default Route.extend(RouteMetaMixin, {
headTags() {
let controller = this.controllerFor(this.routeName);
return [{
type: 'meta',
tagId: 'meta-title',
attrs: {
property: 'title',
content: controller.get('era')
}
}]
}
});
import Controller from '@ember/controller';
export default Controller.extend({
headTagsService: Ember.inject.service('head-tags'),
queryParameters: {
era: 'e'
},
eraObserver: Ember.observer('era', function() {
this.get('headTagsService').collectHeadTags();
}),
});
Route Meta Mixin
Including the RouteMetaMixin in your routes is no longer necessary if
you provide the headTags property. However it's use is still
supported and documented here.
Development
Instructions for developing on this add-on.
Installation
git clone
this repositorynpm install
Running
Running Tests
ember test
ember test --serve
Building
For more information on using ember-cli, visit http://www.ember-cli.com/.