在ngFor内部动态分配元素ID

问题描述

我正在尝试为* ngFor中的div提供一个动态分配的ID.我希望将div称为"wave1，wave2，wave3"等.

I'm trying to give a dynamically assigned id for a div inside a *ngFor. I would like the divs to be called 'wave1, wave2, wave3' etc.

<li *ngFor="let episode of episodes; let i = index">
    <div id="wave{{i}}"></div>
</li>

但是，这将引发以下错误:

However, this throws the following error:

ERROR DOMException: Failed to execute 'querySelector' on 'Document':
     '#wave[object Object]' is not a valid selector.

推荐答案

您可以使用{{ 'wave' + i }}代替wave{{i}}.将其设置为Angular Experession.这是完整的ngFor:

You can use {{ 'wave' + i }} instead of wave{{i}}. Make it as Angular Experession. This is the full ngFor:

<li *ngFor="let episode of episodes; let i = index">
     <div id="{{ 'wave' + i }}"></div>
</li>

它可以工作并使用正确的id

It works and creates the div with the correct id

document.getElementById("wave1")

输出将如下所示:

<div id=​"wave1">​wave1​</div>

但是请记住，您的代码将从wave0开始，而i = index从0开始.

but remember your code will start from wave0 as i = index starts from 0.

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