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What is the difference between JS controller and helper in lightning?
Use Controllers to listen to user events and other events like component, application events. But delegate business logic to helper. Do similar delegation in all Renderer functions (render, rerender and so on). Anytime you need to call one controller function from another controller function, move that logic to Helper.
What does a helper in lightning component contain?
Helper functions are local to a component, improve code reuse, and move the heavy lifting of JavaScript logic away from the client-side controller, where possible. A helper function can be called from any JavaScript code in a component’s bundle, such as from a client-side controller or renderer.
What is the name of the framework that includes Aura components?
Lightning Component Framework
What Is the Lightning Component Framework? The Lightning Component framework is a UI framework for developing web apps for mobile and desktop devices. It’s a modern framework for building single-page applications with dynamic, responsive user interfaces for Lightning Platform apps.
How are JavaScript helpers and controllers used in Lightning?
JavaScript Controllers and Helpers play a key role in Lightning Components Framework.. In this blog we will discuss the difference between JavaScript Controllers and JavaScript Helpers in Salesforce Lightning Components framework.
The following example component creates two buttons to contrast an HTML button with , which is a standard Lightning component. Clicking on these buttons updates the text component attribute with the specified values. target.get (“v.label”) refers to the label attribute value on the button.
In our example with two Account components, the framework creates one copy of the Helper and passes the reference of this Helper into two controller and to two renderer instances. Since Helper is shared across everything, it allows us to share and keep logic across of Controllers and Renderers in one place.
When to use a Helper instead of a controller?
Note: If there are multiple types of components (say, AccountItem.cmp and AccountDetails.cmp), each component type will get a helper of their own. Use Controllers to listen to user events and other events like component, application events. But delegate business logic to helper.