[[ngModel)]和[ngModel]之间的绑定状态与属性之间的区别? [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">

这两个人都做同样的事情.哪个是首选，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" (ngModelChange)="overRideRate = $event"

[(ngModel)]="overRideRate" is the short form of [ngModel]="overRideRate" (ngModelChange)="overRideRate = $event"

• [ngModel]="overRideRate"用于将overRideRate绑定到input.value
• (ngModelChange)="overRideRate = $event"用于在发出change事件时用input.value的值更新overRideRate.

• [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.

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