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Showing content from https://webplatform.github.io/docs/dom/Event/initEvent below:

initEvent Summary

Initializes a new generic event that the createEvent method created.

Syntax

 event.initEvent(eventType, canBubble, cancelable);

Parameters eventType

The name of the event. Sets the value for the type property.

canBubble

Whether the event propagates upward. Sets the value for the bubbles property.

cancelable

Whether the event is cancelable and so preventDefault can be called. Sets the value for the cancelable property.

Return Value

No return value

Examples

The following code example creates a custom event that bubbles but cannot be canceled.

var evt = document.createEvent("Event");
evt.initEvent("custom", true, false);
document.getElementById('target').dispatchEvent(evt);

Usage

 Use this method before the   dispatchEvent method dispatches the event object, to set some properties of the event.

Notes

After the event is dispatched, its properties cannot be changed.

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