In Lightning Web Components (LWC), components often need to communicate with each other. While parent-to-child communication is straightforward, child-to-parent communication works through Custom Events. This approach is essential when a child component needs to send data or trigger logic in the parent.
What is Child-to-Parent Communication?
It allows a child LWC to:
● Send data to the parent
● Notify the parent about user actions
● Trigger logic inside the parent component
This communication relies on Custom Events.
How Custom Events Work?
- Child fires the event
this.dispatchEvent(
new CustomEvent(‘valuechange’, {
detail: { value: selectedValue }
})
);
- Parent listens to the event
<c-child-component onvaluechange={handleValueChange}></c-child-component>
- Parent handles it
handleValueChange(event) {
this.selectedValue = event.detail.value;
}
Example Scenario
A child component sends the selected value from a dropdown to the parent component.
The parent receives this value and displays it in the UI.
Step-by-Step Implementation
Child Component
Parent Component
Understanding the Event Flow
● Child fires a custom event → valuechange
● Parent listens using:
onvaluechange={handleValueChange}
● Parent receives the data through event.detail
● UI updates automatically using the reactive property selectedValue
Custom events provide a clean and powerful way for child components to communicate back to parent components. This ensures reusable components and a well-structured architecture.
Conclusion
Child-to-parent communication in LWC becomes simple with custom events. By following these steps, you can easily send data from a child component to a parent and build clean, modular Lightning components.
In Part 2, we will cover Parent-to-Child communication.
By following the above blog instructions, you will be able to learn Child-to-Parent Communication in LWC – A Complete Guide (Part 1). If you still have queries or any related problems, don’t hesitate to contact us at salesforce@greytrix.com. More details about our integration product are available on our website and Salesforce AppExchange.
We hope you may find this blog resourceful and helpful. However, if you still have concerns and need more help, please contact us at salesforce@greytrix.com.
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