ngFor中的angular2切换图标 [英] angular2 toggle icons inside ngFor

问题描述

有人可以让我知道在进行ngFor时如何切换图标吗?

Can some one please let me know how to toggle icons while doing ngFor?

问题陈述: 我正在使用* ngFor遍历数组并显示类别名称.点击一天后，我需要打开一个手风琴并显示类别详细信息(我可以执行此操作). 当Accordian打开时，我需要将fa-plus图标替换为fa-minus，反之亦然，而我只需要在点击的日子这样做.

Problem Statement: I'm using *ngFor to loop through an array and display category names. On click of day I need to open an accordian and show category details (I can do this). Once accordian opens I need to replace fa-plus icon with fa-minus and vice-versa and I need to do this only for clicked day.

我如何有效地做到这一点?

How can I achieve this effectively?

this.categoryList = [
{type: 'space', name: 'Space'},
{type: 'energy', name: 'Energy'},
{type: 'comfort', name: 'Comfort'},
{type: 'maintenance', name: 'Maintenance'},
{type: 'reporting', name: 'Reporting'}
];

HTML

<div class="{{category.type}}" *ngFor="let category of categoryList">
    <div data-toggle="collapse" [attr.href]="'#'+'category-'+category.type">
    <div class="title {{category.name}}">{{category.name}}</div>
    <div>
        <i class="fa fa-plus"></i> //needs to toggle between plus and minus
                <i class="fa fa-minus"></i> //needs to toggle between plus and minus
    </div>
    </div>

    <div class="collapse" id="category-{{category.type}}">
        //details
    </div>
</div>

推荐答案

如果我理解的正确，那么您在页面上只能有一个<i>而不是两个:

If I understand you right you can have just one <i> on the page instead of having two:

模板:

<div *ngFor="let day of daysInAWeek; let i = index">
    <div>{{day}}</div>
    <div>
        <i class="fa" [ngClass]="toggle[i] ? 'fa-plus': 'fa-minus'" aria-hidden="true"></i>
    </div>
    <div class="details">Today is {{day}}</div>
    <button (click)="toggle[i] = !toggle[i]">Toggle</button>
</div>

ts:

daysInAWeek: string[] = ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su']; 
toggle = {};

因此，您可以仅切换该元素上的类为fa-plus或fa-minus

So you can toggle just toggle classes on that element to be fa-plus or fa-minus

您可以将(click)="toggle[i] = !toggle[i]放在*ngFor temlpate中的任何html元素上，这样将触发相关<i>元素的点击切换.

You can put (click)="toggle[i] = !toggle[i] on any html element inside your *ngFor temlpate so it will trigger the toggle on click for related <i> element.

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