Lightning Aura Components Developer Guide
jNote: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
Value Providers
The value providers for a component are v (view) and c (controller).
| Value Provider | Description | See Also |
|---|---|---|
| v | A component’s attribute set. This value provider enables you to access the value of a component’s attribute in the component’s markup. | Component Attributes |
| c | A component’s controller, which enables you to wire up event handlers and actions for the component | Handling Events with Client-Side Controllers |
All components have a v value provider, but aren't required to have a controller. Both value providers are created automatically when defined for a component.
Global Value Providers
Global value providers are global values and methods that a component can use in expressions.
| Global Value Provider | Description | See Also |
|---|---|---|
| globalID | The globalId global value provider returns the global ID for a component. Every component has a unique globalId, which is the generated runtime-unique ID of the component instance. | Component IDs |
| $Browser | The $Browser global value provider returns information about the hardware and operating system of the browser accessing the application. | $Browser |
| $ContentAsset | The $ContentAsset global value provider lets you reference images, style sheets, and JavaScript used as asset files in your lightning components. | $ContentAsset |
| $Label | The $Label global value provider enables you to access labels stored outside your code. | Using Custom Labels |
| $Locale | The $Locale global value provider returns information about the current user’s preferred locale. | $Locale |
| $Resource | The $Resource global value provider lets you reference images, style sheets, and JavaScript code you’ve uploaded in static resources. | $Resource |
Accessing Fields and Related Objects
Values in a value provider are accessed as named properties. To use a value, separate the value provider and the property name with a dot (period). For example, v.body. You can access value providers in markup or in JavaScript code.
When an attribute of a component is an object or other structured data (not a primitive value), access the values on that attribute using the same dot notation.
For example, {!v.accounts.id} accesses the id field in the accounts record.
For deeply nested objects and attributes, continue adding dots to traverse the structure and access the nested values.