What is binding in Salesforce?
Selection bindings are interaction-driven, where the result is evaluated each time the user makes a selection in the dashboard. For example, when a user selects the Top 5 toggle, a chart shows the top 5 accounts. Result binding uses the result of the query to update the output component.
What is data binding in lightning components?
Eg- Typing into an input field: the updating of the input field occurs locally within a component; it does not affect other components directly so can use two way binding. Using two-way data binding strictly within a component is not problematic.
What is bound and unbound in Salesforce lightning?
When you use a bound expression, a change in the attribute in the parent or child component triggers the change handler in both components. When you use an unbound expression, the change is not propagated between components so the change handler is only triggered in the component that contains the changed attribute.
What is two way binding in Salesforce lightning?
Two way binding allows a model to render data into a view and allows that view to update the data in model. This is mostly used in form fields, for example a text input renders a value from the model, and when the user types data into the field, it is automatically pushed back into the model.
Is LWC two way binding?
Two-way data binding in LWC will help users to exchange data from the controller to the template and form template to the controller. It will help users to establish communication bi-directionally. note - Before Spring '20, to make a field reactive, you had to decorate it with @track.
What is decorator in Salesforce?
Decorators dynamically alter the functionality of a property or function. The ability to create decorators is part of ECMAScript, but these three decorators are unique to Lightning Web Components. @api: It is used to expose a variable or functions publically and make properties reactive.
What is the difference between bound and unbound?
So, a bound form has a RecordSource, a table or query to which the form is "tied" or "based". An unbound form does not have a RecordSource, that doesn't mean it can't contain data, but the programmer will have to bring that data in manually, where a bound form automatically is associated with some data.
What is bubble and capture phase in lightning?
The framework supports capture and bubble phases for component event propagation. These phases are equivalent to DOM handling patterns and allow interested components to interact with an event and potentially control subsequent handlers' behavior. The capture phase is carried out before the bubble phase.
What is a enqueueAction in Salesforce?
enqueueAction(action) adds the server-side controller action to the queue of actions to be executed. All actions that are enqueued will run at the end of the event loop.
What is Shadow DOM in lightning Web components?
Shadow DOM is a standard that encapsulates the internal document object model (DOM) structure of a web component. Encapsulating the DOM gives developers the ability to share a component and protect the component from being manipulated by arbitrary HTML, CSS, and JavaScript.
How are events handled in LWC?
With LWC we can create and dispatch the custom event.Create and Dispatch an Event. Create Event : We can use the customEvent() constructor to create an event. ... Handle an Event : There are two ways to listen to an event.
What is unbound #expression?
Unbound Expression: Unbound Expression is represented as {#v. str}. Whenever the value of the string is changed, this expression will not reflect the change, we can say the value remains static through this expression.