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yield in component that is called from an each helper

Asked By: Anonymous

This is part of my component’s template:

{{#each displayResults}}
  <li {{action addSelection this}} {{bindAttr class=":result active"}}>
  {{#if controller.template}}
    <span class="result-name">{{displayHelper controller.searchPath}}</span>

I want the user to be able to customise the html that is used to display the results.

The problem is that the {{yield}} is called while in an {{#each}} helper and if the component is declared like this:

{{#auto-suggest source=controller.employees destination=controller.chosenEmployees}}
<span class="result-name"><img src="img/small_avatar.png"/>{{fullName}}</span>

Then the block between the {{#auto-suggest}} does not have the context of the {{#each}} helper in the component.

Is there anything I can do or is this just the way it is?


Answered By: Anonymous


Now that ember 1.10 has landed, a new syntax was introduced called block params. So there is no need to override the _yield method. For instance inside of your component’s template you do:

  {{#each item in source}}
    {{! the component is being used in the block form, so we yield}}
    {{#if template.blockParams}}
      {{yield item}}
    {{! no block so just display the item}}

And then when using the component you get the params passed to {{yield}} using as |var|

{{! no block, the component will just display the item}}
{{auto-suggest source=model as |item|}}

{{! in the block form our custom html will be used for each item}}
{{#auto-suggest source=model as |item|}}

Simple live example

Of course, you can yield any variables using {{yield name age occupation hobbies}} and catch them in the component with:

{{#x-foo user=model as |name age occupation hobbies|}}
  Hi my name is {{name}}, I am {{age}} years old. Major of the times I am {{occupation}}, but also love to {{hobbies}}.


You can override the default _yield method, of Ember.Component, and change the context: get(parentView, 'context') to context: get(view, 'context').

App.AutoSuggestComponent = Ember.Component.extend({
  _yield: function(context, options) {      
    var get = Ember.get, 
    view =,
    parentView = this._parentView,
    template = get(this, 'template');

    if (template) {
      Ember.assert("A Component must have a parent view in order to yield.", parentView);      
      view.appendChild(Ember.View, {
        isVirtual: true,
        tagName: '',
        _contextView: parentView,
        template: template,
        context: get(view, 'context'), // the default is get(parentView, 'context'),
        controller: get(parentView, 'controller'),
        templateData: { keywords: parentView.cloneKeywords() }

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