如何实现Angular的“盒子里的香蕉"与自定义元素进行双向绑定? [英] How do I implement Angular's "banana in a box" two-way binding with Custom Elements?

问题描述

我正在尝试构建一个将由Angular应用程序使用的自定义元素.自定义元素将使用道具并可能对其进行操纵.

I'm trying to build a custom element that will be consumed by an Angular app. The custom element will take a prop and potentially manipulate it.

我的理解是，我可以使用盒子里的香蕉"来处理这种绑定，也可以将<custom-element [(foo)]="bar">转换为<custom-element [foo]="bar" (fooChange)="bar = newBar">等.

My understanding was that I could use the "banana in a box" to handle this binding, aka <custom-element [(foo)]="bar"> gets converted to <custom-element [foo]="bar" (fooChange)="bar = newBar">, or the like.

我的Angular模板:

My Angular template:

<an-el [(clicked)]="isClicked"></an-el>
<p>Did you click a button? {{ isClicked }}</p>

我的自定义元素调度一个事件:

My custom element dispatches an event:

this.dispatchEvent(new CustomEvent('clickedChange', { bubbles: true, detail: true }));

this.dispatchEvent(new CustomEvent('clickedChange', { bubbles: true, detail: true }));

但是它似乎将整个CustomEvent绑定到isClicked:

But it appears to bind the entire CustomEvent to isClicked:

Did you click a button? [object CustomEvent]

我在做什么错了?

这是我的应用程序(在Chrome中运行): https://stackblitz.com/edit/angular-nlguf4

Here's my app (run in Chrome): https://stackblitz.com/edit/angular-nlguf4

推荐答案

我将isClicked声明替换为:

private _isClicked = false;

public get isClicked() {
    return this._isClicked;
  }
public set isClicked(val: CustomEvent | boolean) {
    this._isClicked = typeof val === "boolean" ? val : val["detail"];
  }

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