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Events are fired without arguments and event listeners are ignored

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
停滞
技术栈
javascript
领域
web-dev

调研方向

Start in IdentityProxyXHR.js around lines 94-96 and reproduce the issue with XMLHttpRequest listeners registered through addEventListener and the onload shorthand. The change is complete when registered event listeners are invoked and callbacks receive the relevant event arguments, including progress and load events.

由索引模型根据 Issue 内容生成。

描述

This code simply executes xhr.onreadystatechange, xhr.onload and xhr.onloadend. There's a lot of different ways how events can be registered and fired (e.g. if one adds listeners with xhr.addEventListener(...). This means that if you don't register your listeners with one of the three shorthands, they are never fired.

Also, the mentioned code calls the callbacks without event arguments:
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readystatechange_event
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/loadend_event
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/load_event

This leads to consumers not being able to access these events in their registered callbacks, which leads to exceptions if they do so. A very simple reproducer:

const x = new XMLHttpRequest();
x.open("GET", location.href);
x.addEventListener("progress", (event) => {
  console.log(`progress: ${event.loaded * 100/event.total} %`);
});
x.addEventListener("load", (event) => {
  console.log(`loaded ${event.loaded} bytes`);
});
x.send();

In this scenario, none of the events are fired. if you replace the addEventListener calls with the shorthands, you can see that only load is called without the event argument (progress is not called whatsoever):

x.onprogress =  (event) => {
  console.log(`progress: ${event.loaded * 100/event.total} %`);
};
x.onload = (event) => {
  console.log(`loaded ${event.loaded} bytes`);
};
主要语言
JavaScript
星标
52
派生
16
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