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Adding CSS Classes to Your Components Based on Properties

Problem

You want to add or remove CSS class names to your Ember Components based on properties of the component.

Solution

Add property names to the classNameBindings property of subclassed components.

Discussion

You can apply classes based on properties of the component, or even by properties bound to data passed into the component. This is done by binding the class attribute using classNameBindings.

classNameBindings: ['active'],
active: true

You can also set the class name based on a computed property.

classNameBindings: ['isActive'],
isActive: function() {
  return 'active';
}.property('someAttribute')

Another way would be to bind the class name to a bound property.

classNameBindings: ['isRelated:relative'],
isRelatedBinding: "content.isRelated" // value resolves to boolean

Example

JS Bin

See Customizing a Component's Element for further examples.