如何使用 ngFor 连续迭代两个元素 [英] How to iterate two elements in a row with ngFor
问题描述
我有一个字符串数组,我想用 ngFor 将它们中的每两个排成一行.这是我尝试过的:
<md-card><md-card-header><md-card-title>{{指数}}</md-card-title></md-card-header></md-card><div class='col-md-6' *ngIf='i+1 <myArray.length'><md-card><md-card-header><md-card-title>{{myArray[i+1}}</md-card-title></md-card-header></md-card>
但是当我添加一个新元素时,它会复制以前的元素,我真的不明白原因.如何使用 ngFor 在每行中添加两个元素?
你可以通过为 *ngIf 查找偶数(0,第一个索引是偶数)来跳过所有其他索引,并很快显示下一个项目被跳过(奇数)项目:
<div class='row wow fadeInUp' *ngFor='let index of myArray;让我 = 指数;让 even = even'><span *ngIf="even"><div class='col-md-6' ><md-card><md-card-header><md-card-title>{{myArray[i]}}</md-card-title></md-card-header></md-card>
</span>
I have array of strings and I want to place every two of them in a row with ngFor. Here is what I tried:
<div class='row wow fadeInUp' *ngFor='let index of myArray;let i = index;'>
<div class='col-md-6'>
<md-card>
<md-card-header>
<md-card-title>
{{index}}
</md-card-title>
</md-card-header>
</md-card>
</div>
<div class='col-md-6' *ngIf='i+1 < myArray.length'>
<md-card>
<md-card-header>
<md-card-title>
{{myArray[i+1}}
</md-card-title>
</md-card-header>
</md-card>
</div>
</div>
But when I add a new element, it duplicates the previous element and I really don't underestand the reason. How can I add two elements in each row with ngFor?
You can skip every other index just by looking for even numbers (0, the first index is even) for *ngIf, and display that items with the next soon be skipped (odd) item:
<div class='row wow fadeInUp' *ngFor='let index of myArray; let i = index; let even = even'>
<span *ngIf="even">
<div class='col-md-6' >
<md-card>
<md-card-header>
<md-card-title>
{{myArray[i]}}
</md-card-title>
</md-card-header>
</md-card>
</div>
<div class='col-md-6'>
<md-card>
<md-card-header>
<md-card-title>
{{myArray[i+1]}}
</md-card-title>
</md-card-header>
</md-card>
</div>
</span>
</div>
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