I need to combine linkTo and action helpers in Ember.js. My code is:

{{#link-to 'index'}}<span {{action 'clear'}}>Clear</span>{{/link-to}}

But I would like to make this something like this:

{{#link-to 'index' {{action 'clear'}} }}Clear{{/link-to}}

And also:

<li>
    {{#link-to 'support'}}
        <span {{action 'myAction' 'support'}}>Support</span>
    {{/link-to}}
</li>

To:

<li>
    {{#link-to 'support' {{action 'myAction' 'support'}} }}Support{{/link-to}}
</li>

How can I achieve this?

Solution

Check my answer for Ember 2.0 compatible, OK for SEO solution.

Ember Link Action addon

This is OK for SEO solution!

Install addon

ember install ember-link-action

Usage

You can pass closure action as invokeAction param to {{link-to}} component:

{{#link-to 'other-route' invokeAction=(action 'testAction')}}
  Link to another route
{{/link-to}}

To pass parameters to action you can use:

{{#link-to 'other-route' invokeAction=(action 'testAction' param1 param2)}}
  Link to another route
{{/link-to}}

Compatibility

Automated test suite confirms that addon works with 1.13 up to latest Ember 3 releases.

It works with a release, beta and canary versions of Ember.

Addon GitHub repository. Contributions are welcome.

Update: See Michael Lang's comment below for Ember 1.8.1+

The problem with Myslik's answer (not using link-to at all but instead using an action and then transitionToRoute) is that it's useless for SEO, search engine bots will see nothing.

If you want what your link is pointing to to be indexed, it's easiest to have a good old <a href=x> in there. It's best to use link-to so that your link URLs are kept in sync with your route URLs. The solution I use gives both an action to do the work and a handy link-to to index the pages.

I override some functionality of Ember.LinkView:

Ember.LinkView.reopen({
  action: null,
  _invoke: function(event){
    var action = this.get('action');
    if(action) {
      // There was an action specified (in handlebars) so take custom action
      event.preventDefault(); // prevent the browser from following the link as normal
      if (this.bubbles === false) { event.stopPropagation(); }

      // trigger the action on the controller
      this.get('controller').send(action, this.get('actionParam'));
      return false; 
    }           

    // no action to take, handle the link-to normally
    return this._super(event);
  }
});

Then I can specify which action to take and what to pass the action in Handlebars:

<span {{action 'view' this}}>
  {{#link-to 'post' action='view' actionParam=this}}
    Post Title: {{title}}
  {{/link-to}}
</span>

In the controller:

App.PostsIndexController = Ember.ArrayController.extend({
  actions: {
    view: function(post){
      this.transitionToRoute('post', post);
    }
  }
}

This way, when I cache a rendered copy of the page and serve that to an indexing bot, the bot will see a real link with an URL and follow it.

(note also that transitionTo is now deprecated in favour of transitionToRoute)

None of these combinations will work in Ember.js, but you do not need to combine these two helpers. Why don't you just use action helper and let it bubble to controller or route? There you can use transitionToRoute in controller or transitionTo in route.

For example in controller you could have code like this:

App.PostsController = Ember.ArrayController.extend({
    clear: function () {
        // implement your action here
        this.transitionToRoute('index');
    }
});

neverfox

This works fine in 1.6.0-beta.5:

<span {{action "someAction"}}>
  {{#link-to "some.route"}}
    Click Me
  {{/link-to}}
</span>

The link will happen and then the click will bubble up to the action handler. It's documented (albeit indirectly) here.

Edit: corrected syntax in opening link tag

I like Cereal Killer's approach for its simplicity, but unfortunately it exhibits a problem for me. When the browser navigates to another route, it restarts the Ember application.

As of Ember 2.6, the following simple approach does the trick:

<span {{action 'closeNavigationMenu'}}> {{#link-to 'home' preventDefault=false}} Go Home {{/link-to}} </span>

This achieves the following:

navigates to route 'home'
action 'closeNavigationMenu' is invoked
on mouseover, browser displays link that will be followed (for SEO and better UX)
browser navigation does not result in reboot of Ember app

Having the same problem, i found this simple solution:

{{#linkTo eng.rent class="external-button"}}<div class="internal-button" {{action "updateLangPath"}} >X</div>{{/linkTo}}

then, managing the css classes external-button and internal-button in the stylesheet, i made sure that the "internal-button" was covering the whole "external-button" area; in this way it is not possible to click on the external-button without clicking on the internal-button.

It works well for me; hope it can help...

This is how I solved this in our demo application for the O'Reilly Ember.js book: https://github.com/emberjsbook.

You can see the complete source here: https://github.com/emberjsbook/rocknrollcall

In the view:

{{#if artistsIsChecked}}
  {{#if artists.length}}
    <h3>Artists</h3>

    <ul class="search-results artists">
      {{#each artists}}
        <li><a {{action 'viewedArtist' this.enid }}>{{name}}</a></li>
      {{/each}}
    </ul>
  {{/if}}
{{/if}}

And the controller:

App.SearchResultsController = Em.ObjectController.extend({
  actions: {
    viewedArtist: function(enid) {
      this.transitionToRoute('artist', enid);
    },
    viewedSong: function(sid) {
      this.transitionToRoute('song', sid);
    }
  },
  needs: ['artists', 'songs'],
  artistsIsChecked: true,
  songsIsChecked: true,
  artists: [],
  songs: []
});

Ember's link-to tags use routes to open new views, so you can perform whatever functionality you wanted to put in the link's 'action' attribute in the setupController method of the target route instead of in a controller action.

See here in the Ember guide: http://emberjs.com/guides/routing/setting-up-a-controller/

This only works if you want to perform the action every time the route is accessed, however, as opposed to with specific links.

Make sure to include the controller.set('model', model); line along with whatever else you put in there.

来源：https://stackoverflow.com/questions/16124381/combine-linkto-and-action-helpers-in-ember-js

标签

javascript