iron router: prevent template rerender?

[Davide Dal Colle]

I'd like to use routes to register application states, but the page itself doesn't need to swap templates. 

The routing should register the URL change and just apply effects on html elements, such opening windows or displaying lists of items.

Is this behavior possible with iron router?

Thank you.

[Patrick Scott]

Haven't tried it, but according to the documentation it looks like you should be able to provide an action function:

Router.map(function () {
  this.route('postShow', {
    path: '/posts/:_id',

    action: function () {
      // this => instance of RouteController
      // access to:
      //  this.params
      //  this.wait
      //  this.render
      //  this.stop
      //  this.redirect
    }
  });
});

[Davide Dal Colle]

The problem with custom action is that, if the user enter the site in that route, no template is specified. But I shall check the documentation better about this

[Tom Coleman]

Hi David,

Yes, so for this reason you should make sure you use the same templates and data on all of your related routes.

You can call `this.render()` or just use a hook to ensure they are always rendered.

What Iron Router aims to do is avoid unnecessary re-renders in such situations -- the idea isn't to keep vestiges of old routes around when users browse around -- as you said that doesn't work if they happen to hit refresh.

When the UI branch of Meteor lands we may not even need to do that any more (more investigation is still required).

Cheers,

Tom

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[Kris Haamer]

Hey David, did you manage to get this to work? What i'm trying to do is set globe variables (the site language) based on the route but at least 

with the meteor i18n this is not working.

[Chris Mather]

To clarify how the Router deals with rendering (currently): It will only render the template if it's not already rendered into the given yield region. 

For example:

this.render('myTemplate');

this.render('myTemplate');

This will only render myTemplate once, into the main yield region {{yield}}.

So if you register a global before hook that renders the one template you want for all routes, you can override the action function of each individual route to do what you want. 

For example:

```

Router.before(function () {

  this.render('someGlobalTemplate'); // or just use a Router option

});

Router.map(function () {

  this.route('something', {

    path: '/with/:dynamic/:segment',

    action: function () {

      Session.set('dynamic', this.params.dynamic);

      Session.set('segment', this.params.segment);

    }

  });

});

```