[(ngModel)] 和 [ngModel] 之间将状态绑定到属性的区别? [英] Difference between [(ngModel)] and [ngModel] for binding state to property?

问题描述

这是一个模板示例:

<input type="number" class="form-control" [(ngModel)]="overRideRate" formControlName="OverRideRate">

<input type="number" class="form-control" [ngModel]="overRideRate" formControlName="OverRideRate">

这里他们都做同样的事情.首选哪一个?为什么?

Here both of them do the same thing. Which one is preferred and why?

推荐答案

[(ngModel)]="overRideRate" 是 [ngModel]="overRideRate" 的缩写形式(ngModelChange)="overRideRate = $event"

• [ngModel]="overRideRate" 是将 overRideRate 绑定到 input.value
• (ngModelChange)="overRideRate = $event" 是在 已发出更改 事件.

• [ngModel]="overRideRate" is to bind overRideRate to the input.value
• (ngModelChange)="overRideRate = $event" is to update overRideRate with the value of input.value when the change event was emitted.

它们共同构成了 Angular2 提供的双向绑定.

Together they are what Angular2 provides for two-way binding.

这篇关于[(ngModel)] 和 [ngModel] 之间将状态绑定到属性的区别?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！