Package @ember/component

Glimmer is a templating engine used by Ember.js that is compatible with a subset of the Handlebars syntax.

Showing a property

Templates manage the flow of an application's UI, and display state (through the DOM) to a user. For example, given a component with the property "name", that component's template can use the name in several ways:

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import Component from '@ember/component';

export default Component.extend({
  name: 'Jill'
});

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{{name}}
<div>{{name}}</div>
<span data-name={{name}}></span>

Any time the "name" property on the component changes, the DOM will be updated.

Properties can be chained as well:

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{{aUserModel.name}}
<div>{{listOfUsers.firstObject.name}}</div>

Using Ember helpers

When content is passed in mustaches {{}}, Ember will first try to find a helper or component with that name. For example, the if helper:

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{{if name "I have a name" "I have no name"}}
<span data-has-name={{if name true}}></span>

The returned value is placed where the {{}} is called. The above style is called "inline". A second style of helper usage is called "block". For example:

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{{#if name}}
I have a name
{{else}}
I have no name
{{/if}}

The block form of helpers allows you to control how the UI is created based on the values of properties. A third form of helper is called "nested". For example here the concat helper will add " Doe" to a displayed name if the person has no last name:

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<span data-name={{concat firstName (
if lastName (concat " " lastName) "Doe"
)}}></span>

Ember's built-in helpers are described under the Ember.Templates.helpers namespace. Documentation on creating custom helpers can be found under helper (or under Helper if a helper requires access to dependency injection).

Invoking a Component

Ember components represent state to the UI of an application. Further reading on components can be found under Component.

Functions

@ember/component/helper

• helper