Is there a way to dynamically call an Ember component using a variable?

Question

Is there a way to dynamically call an Ember component using a variable?

Imagine having an array of widget objects stored in your controller, with each widget object containing a member variable assigned the name of a component class. How can you make your template call upon that specific component?

//widgets[0].widget.componentClass="blog-post"

{{#each widget in widgets}}
    {{widget.componentClass}}
{{/each}}

The example above simply displays strings representing the widget component classes. To actually invoke the components, you can utilize the following approach:

//widgets[0].widgets.viewClass="blogPost"

{{#each widget in widgets}}
    {{view widget.viewClass}}
{{/each}

In our previous setup, we used a custom {{renderWidget ...}} tag along with a Handlebars helper, which can be found detailed here. The default render helper encountered issues when trying to render based on a variable name. I am contemplating creating a custom component handlebars helper but unsure where to begin. Any guidance would be appreciated. Thank you.

javascript ember.js

Answer 1

Answer №1

After experimenting with this method, I discovered that it does indeed work. However, the process involved a fair amount of trial and error on my part:

Ember.Handlebars.registerHelper('renderComponent', function(componentPath, options) {
  var component = Ember.Handlebars.get(this, componentPath, options),
      helper = Ember.Handlebars.resolveHelper(options.data.view.container, component);

  helper.call(this, options);

});

To implement it, you can simply follow the same pattern:

{{#each item in items}}
  {{renderComponent item.componentType item=item}}
{{/each}}

Answer 2

After experimenting with this method, I discovered that it does indeed work. However, the process involved a fair amount of trial and error on my part:

Ember.Handlebars.registerHelper('renderComponent', function(componentPath, options) {
  var component = Ember.Handlebars.get(this, componentPath, options),
      helper = Ember.Handlebars.resolveHelper(options.data.view.container, component);

  helper.call(this, options);

});

To implement it, you can simply follow the same pattern:

{{#each item in items}}
  {{renderComponent item.componentType item=item}}
{{/each}}

Answer 3

Answer №2

With Ember 1.11, a revolutionary new component helper has been introduced, allowing for the following syntax:

{{#each widget in widgets}}
  {{component widget.componentClass}}
{{/each}}

Although Ember 1.11 is not yet officially stable as of Jan 19th, 2015, this functionality is available in the canary build.

Answer 4

With Ember 1.11, a revolutionary new component helper has been introduced, allowing for the following syntax:

{{#each widget in widgets}}
  {{component widget.componentClass}}
{{/each}}

Although Ember 1.11 is not yet officially stable as of Jan 19th, 2015, this functionality is available in the canary build.

Answer 5

Answer №3

It seems like we've encountered many of the same issues. All the components are registered as top-level helpers, so you can use a similar approach to the one you mentioned by creating a handlebars helper for performing the lookup. Here's an example code snippet:

Ember.Handlebars.registerHelper('lookup', function(component, options) {
  component = Ember.Handlebars.get(this, component, options);
  Ember.Handlebars.helpers[component].call(this, options);
});

Then in your template, you can use it like this:

{{#each widget in widgets}}
  {{lookup widget.componentClass}}
{{/each}}

Check out this jsbin with a demonstration: http://jsbin.com/ucanam/2482/edit

I hope this solution works for you!

-- updated --

Due to changes in handlebars, calling helpers from other helpers is no longer possible. Instead, you can access the template using the Ember.TEMPLATES global variable. I have revised the JSBin to reflect this method.

You can also retrieve the template using

options.data.view.templateForName(component)

, but it may be less reliable than using Ember.TEMPLATES.

-- latest update --

The method has been updated once again. Now, using Ember.Handlebars.resolveHelper is the recommended approach. Check out @StrangeLooper's answer for more details.

Answer 6

It seems like we've encountered many of the same issues. All the components are registered as top-level helpers, so you can use a similar approach to the one you mentioned by creating a handlebars helper for performing the lookup. Here's an example code snippet:

Ember.Handlebars.registerHelper('lookup', function(component, options) {
  component = Ember.Handlebars.get(this, component, options);
  Ember.Handlebars.helpers[component].call(this, options);
});

Then in your template, you can use it like this:

{{#each widget in widgets}}
  {{lookup widget.componentClass}}
{{/each}}

Check out this jsbin with a demonstration: http://jsbin.com/ucanam/2482/edit

I hope this solution works for you!

-- updated --

Due to changes in handlebars, calling helpers from other helpers is no longer possible. Instead, you can access the template using the Ember.TEMPLATES global variable. I have revised the JSBin to reflect this method.

You can also retrieve the template using

options.data.view.templateForName(component)

, but it may be less reliable than using Ember.TEMPLATES.

-- latest update --

The method has been updated once again. Now, using Ember.Handlebars.resolveHelper is the recommended approach. Check out @StrangeLooper's answer for more details.

Answer 7

Answer №4

If you find yourself working with Ember CLI and Coffeescript, here's a customized solution for that scenario. Simply create a new file named

app/helpers/render-component.coffee

:

renderComponent = (componentPath, options)->
  helper = Ember.Handlebars.resolveHelper(options.data.view.container, componentPath)
  helper.call this, options

`export { renderComponent }`
`export default Ember.Handlebars.makeBoundHelper(renderComponent)`

After setting up the file, you can use {{render-component "foo-bar"}} in your template.

Keep in mind that the Ember framework is constantly evolving, and I have successfully tested this version with the following setup:

Ember-CLI v2.13.0
Ember v3.7.2
Handlebars 4.5.1

Answer 8

If you find yourself working with Ember CLI and Coffeescript, here's a customized solution for that scenario. Simply create a new file named

app/helpers/render-component.coffee

:

renderComponent = (componentPath, options)->
  helper = Ember.Handlebars.resolveHelper(options.data.view.container, componentPath)
  helper.call this, options

`export { renderComponent }`
`export default Ember.Handlebars.makeBoundHelper(renderComponent)`

After setting up the file, you can use {{render-component "foo-bar"}} in your template.

Keep in mind that the Ember framework is constantly evolving, and I have successfully tested this version with the following setup:

Ember-CLI v2.13.0
Ember v3.7.2
Handlebars 4.5.1

Is there a way to dynamically call an Ember component using a variable?

Answer №1

Answer №2

Answer №3

-- updated --

-- latest update --

Answer №4

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