In Lightning Web Components (LWC), components often need to exchange data or trigger actions within the component hierarchy. While child-to-parent communication depends on Custom Events, parent-to-child communication is far more straightforward. It enables the parent component to pass data, control behavior, or invoke methods directly inside the child component.
This interaction is essential when the parent determines what the child should display or needs to trigger a specific function in the child.
What is Parent-to-Child Communication?
Parent-to-child communication in LWC allows a parent component to:
- Pass data into a child component
- Control the child’s UI or behavior
- Invoke public methods defined in the child
- Provide configuration values the child should use
This communication primarily uses:
- @api public properties
- @api public methods
How Does Parent-to-Child Communication Work?
Parent passes a value to the child
<c-child-component message=”Hello from Parent”></c-child-component>
Child exposes a public property
@api message;
Parent calls a child’s public method
this.template.querySelector(‘c-child-component’).resetForm();
Example Scenario
A parent component passes a message to the child and triggers the child’s public method when a button is clicked.
Step-by-Step Implementation
Child Component
Parent Component
Understanding the Data Flow
- The parent passes data to the child using @api public properties.
- The child displays the received data inside its template.
- The parent can access the child using querySelector and call its public method.
- The child updates its state based on the invoked method by the parent.
Conclusion
Parent-to-child communication in Lightning Web Components (LWC) is a simple yet powerful mechanism that allows parent components to pass data, control behavior, and invoke methods in child components using @api properties and public methods. By understanding this communication flow, developers can build flexible, reusable, and well-structured LWC architectures that enhance both UI performance and user experience. This approach not only simplifies component interactions but also ensures cleaner, more maintainable code across Salesforce applications.
By following the above blog instructions, you will be able to learn “Parent-to-Child Communication in LWC – A Complete Guide (Part 2)”. 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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