Lightning Aura Components Developer Guide
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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.