Aurelia自定义元素:访问父方法 [英] Aurelia Custom Elements: Access Parent method

问题描述

我正在使用Aurelia的自定义元素"在一组条目上重复.以下是示例要点: https://gist.run/?id=38aee85444712​​2f021bc05e1e0de25ae

I am using Aurelia's Custom Elements to repeat over a set of entries. Here is the sample gist: https://gist.run/?id=38aee854447122f021bc05e1e0de25ae

现在，单击自定义元素中定义的按钮时，我需要访问deleteEntry(entry)方法.我尝试使用$parent.deleteEntry(entry)，但无法正常工作.

Now, I need to access the deleteEntry(entry) method when clicked on the button defined in custom element. I tried using $parent.deleteEntry(entry) but it's not working.

看到此问题，但是它已经使用了一年多了，我想知道现在是否有一种更清洁的方法来实现这一目标.

Saw this issue, but it's more than an year old and I am wondering if there is a cleaner way to achieve this now.

推荐答案

为什么不使用call绑定来完成此任务?

Why not use the call binding to accomplish this?

以下是一个示例: https://gist.run?id=3cc553ea3bd7ed1862d87d8dbe4f5f84 strong>

Here's an example: https://gist.run?id=3cc553ea3bd7ed1862d87d8dbe4f5f84

app.html

<template>
    <require from="./entry"></require>

        <h2 class='text-center'>Journal Entries</h2>

        <div>
            <entry repeat.for='entry of entries' entry.bind='entry' delete-function.call="deleteEntry(entry)"></entry>
        </div>

</template>

app.js

export class App {

    entries = [{
          'date': 'Jan 1',
          'note': 'Hello World'
        }, {
          'date': 'Jan 2',
          'note': 'Good Morning'
        }];


    deleteEntry(entry) {
        console.log("Deleting entry");
        console.log(entry);

        const index = this.entries.indexOf(entry);

        this.entries.splice(index, 1);
    }
}

entry.html

<template>
  <div>${entry.date} <button click.trigger='delete()'>X</button></div>

  <div>${entry.note}</div>

</template>

entry.js

import {bindable} from 'aurelia-framework';

export class EntryCustomElement {
    @bindable entry;
    @bindable deleteFunction;

    delete() {
      this.deleteFunction();
    }

}

很明显，在一个实际的实现中，您需要确保绑定到deleteFunction的实际上是一个函数，然后再尝试调用它.

Obviously in a real implementation, you'll need to make sure that what is bound to deleteFunction is actually a function before trying to call it.

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