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check EventTarget params (#2018)

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迷渡 2019-03-31 01:40:03 +08:00 committed by Ryan Dahl
parent 51c6f33f64
commit ad3cbc50fb
1 changed files with 4 additions and 0 deletions
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4
js/event_target.ts
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@ -1,5 +1,6 @@
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as domTypes from "./dom_types";
import { requiredArguments } from "./util";
/* TODO: This is an incomplete implementation to provide functionality
* for Event. A proper spec is still required for a proper Web API.
@ -14,6 +15,7 @@ export class EventTarget implements domTypes.EventTarget {
listener: domTypes.EventListenerOrEventListenerObject | null,
_options?: boolean | domTypes.AddEventListenerOptions
): void {
requiredArguments("EventTarget.addEventListener", arguments.length, 2);
if (!this.listeners.hasOwnProperty(type)) {
this.listeners[type] = [];
}
@ -27,6 +29,7 @@ export class EventTarget implements domTypes.EventTarget {
callback: domTypes.EventListenerOrEventListenerObject | null,
_options?: domTypes.EventListenerOptions | boolean
): void {
requiredArguments("EventTarget.removeEventListener", arguments.length, 2);
if (this.listeners.hasOwnProperty(type) && callback !== null) {
this.listeners[type] = this.listeners[type].filter(
listener => listener !== callback
@ -35,6 +38,7 @@ export class EventTarget implements domTypes.EventTarget {
}
public dispatchEvent(event: domTypes.Event): boolean {
requiredArguments("EventTarget.dispatchEvent", arguments.length, 1);
if (!this.listeners.hasOwnProperty(event.type)) {
return true;
}