Angular2-单击按钮更新模型 [英] Angular2 - Update model on button click

问题描述

在将angular2 ngModel用于双向数据绑定时:

<input [(ngModel)]="heroName">

有没有一种方法只能在单击按钮后更新模型?还是可以取消用户对输入控件所做的更改?我知道另一种方法，我们可以将[(ngModel)]分为[]和()，并且仅在模糊或按Enter键等时更新输入-但这不是我想要的.

我需要这个行为，因为用户必须能够取消更改. 谢谢

解决方案

您可以为此执行以下操作，

演示: http://plnkr.co/edit/OW61kGGcxV5MuRlY8VO4?p=preview

{{heroName}}<br>
<input [ngModel]="heroName" #change> <br>
<br>
<button (click)="update(change.value)">Update Model</button>

---

export class App {
  heroName="Angular2";
  update(value){
    console.log('value before button click' + this.heroName);
    this.heroName=value;
    console.log('value after button click' + this.heroName);
  }
}

When using the angular2 ngModel for two-way data binding:

<input [(ngModel)]="heroName">

Is there a way to only update the model once a button is clicked? Or be able to cancel the changes that the user made to the input control? I am aware of the other approach where we can split the [(ngModel)] in its [] and () and only update the input on blur or when the Enter key is pressed etc - but this is not what I want.

I need this behavious because, the user must be able to cancel the changes. Thanks

解决方案

You can do following for that,

DEMO : http://plnkr.co/edit/OW61kGGcxV5MuRlY8VO4?p=preview

{{heroName}}<br>
<input [ngModel]="heroName" #change> <br>
<br>
<button (click)="update(change.value)">Update Model</button>

---

export class App {
  heroName="Angular2";
  update(value){
    console.log('value before button click' + this.heroName);
    this.heroName=value;
    console.log('value after button click' + this.heroName);
  }
}

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