How are change handlers used in Lightning aura?

How are change handlers used in Lightning aura?

The value attribute sets the component attribute that the change handler tracks. The action attribute sets the client-side controller action to invoke when the attribute value changes. A component can have multiple tags to detect changes to different attributes.

How to bind two components in Lightning aura?

When you instantiate the wrapped component in the wrapper component, initialize the attribute value instead of initializing the attribute in the wrapped component’s client-side controller. Now, let’s update the code to use a bound expression instead. Change this line in c:parentExpr: In the Developer Console, click Update Preview for c:exprApp.

How does data binding between components work in Salesforce?

However, change handlers in the parent aren’t notified. The same behavior applies for changes in the parent propagating to the child. Data updates in either component are reflected through bidirectional data binding in both components.

How to create data binding between component values?

When you add a component in markup, you can use an expression to initialize attribute values in the component based on attribute values of the container component. There are two forms of expression syntax, which exhibit different behaviors for data binding between the components.

How to bind child component to parent component?

Consider a c:parent component that has a parentAttr attribute. c:parent contains a c:child component with a childAttr attribute that’s initialized to the value of the parentAttr attribute.

Why are change handlers triggered in both parent and child components?

Similarly, change handlers are triggered in both the parent and child components. Bi-directional data binding is expensive for performance and it can create hard-to-debug errors due to the propagation of data changes through nested components.

What is the Component Library in Salesforce Lightning?

The Component Library is the Lightning components developer reference. Rapidly develop apps with our responsive, reusable building blocks. Loading ×Sorry to interrupt CSS Error Refresh Cookie Consent Manager

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