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LWC (Lightning Web Components) is a framework provided by Salesforce for building web components on the Salesforce Lightning platform. LWC events are used to facilitate communication between different components in an application. Here are some examples of LWC events with code snippets:
1. Parent-Child Component Communication:
ParentComponent.html:
<template>
<lightning-button label="Fire Event" onclick={fireEvent}></lightning-button>
<c-child-component oncustomevent={handleEvent}></c-child-component>
</template>
ParentComponent.js:
import { LightningElement } from 'lwc';
export default class ParentComponent extends LightningElement {
fireEvent() {
const event = new CustomEvent('customevent', { detail: 'Event Data' });
this.dispatchEvent(event);
}
handleEvent(event) {
// Handle event data received from child component
console.log(event.detail);
}
}
ChildComponent.html:
<template>
<p>Child Component</p>
</template>
ChildComponent.js:
import { LightningElement, api } from 'lwc';
export default class ChildComponent extends LightningElement {
@api
oncustomevent(event) {
// Handle event received from parent component
console.log(event.detail);
}
}
2. Component Event Bubbling:
ChildComponent.html:
<template>
<button onclick={fireEvent}>Fire Event</button>
</template>
ChildComponent.js:
import { LightningElement } from 'lwc';
export default class ChildComponent extends LightningElement {
fireEvent() {
const event = new CustomEvent('customevent', {
bubbles: true, // Enable event bubbling
composed: true, // Allow event to cross the shadow boundary
detail: 'Event Data',
});
this.dispatchEvent(event);
}
}
ParentComponent.html:
<template>
<p>Parent Component</p>
<c-child-component oncustomevent={handleEvent}></c-child-component>
</template>
ParentComponent.js:
import { LightningElement } from 'lwc';
export default class ParentComponent extends LightningElement {
handleEvent(event) {
// Handle event data received from child component
console.log(event.detail);
}
}
3. Component Event Propagation (Stop Propagation):
GrandParentComponent.html:
<template>
<p>GrandParent Component</p>
<c-parent-component></c-parent-component>
</template>
GrandParentComponent.js:
import { LightningElement } from 'lwc';
export default class GrandParentComponent extends LightningElement {}
ParentComponent.html:
<template>
<p>Parent Component</p>
<c-child-component oncustomevent={handleEvent}></c-child-component>
</template>
ParentComponent.js:
import { LightningElement } from 'lwc';
export default class ParentComponent extends LightningElement {
handleEvent(event) {
event.stopPropagation(); // Stop event propagation
}
}
ChildComponent.html:
<template>
<button onclick={fireEvent}>Fire Event</button>
</template>
ChildComponent.js:
import { LightningElement } from 'lwc';
export
default class ChildComponent extends LightningElement {
fireEvent() {
const event = new CustomEvent('customevent', { detail: 'Event Data' });
this.dispatchEvent(event);
}
}
These examples demonstrate different scenarios of LWC event handling, including parent-child component communication, event bubbling, and event propagation. Feel free to modify and adapt these code snippets to suit your specific requirements and component structure.