带有ngFor输入的Angular 2模板驱动窗体

问题描述

是否有可能在模板驱动的表单中使用ngFor创建输入字段，并使用类似＃name =ngModel的字样来在另一个标记中使用name.valid？

现在我们有一个包含数量字段的产品动态列表和一个表格中的添加到购物车按钮。我想把整个事情做成一个表单，在末尾添加全部按钮，如下所示：

 < form＃form = ngForm > 
< div * ngFor =item in items> 
< input name =product  -  {{item.id}}
 [（ngModel）] =item.qty
＃???? =ngModel
 validateQuantity> 
  [disabled] =！????。valid>添加到购物车< / button> 
< / div> 
  [disabled] =！form.valid>全部添加< / button> 
< / form> 
  

但是我怎么能为ngModel的每行生成一个新的变量名？

解决方案

没有必要这样做，就像这样做：

 < form＃form =ngForm> 
< div * ngFor =item in items> 
< input name =product  -  {{item.id}}
 [（ngModel）] =item.qty
 validateQuantity 
＃qtyInput> 
  [disabled] =！qtyInput.valid>添加到购物车< / button> 
< / div> 
  [disabled] =！form.valid>全部添加< / button> 
< / form> 
  

它的Angular部分在这里。 ：）

Is it possible to create input fields with a ngFor in a template driven form and use something like #name="ngModel" to be able to use name.valid in another tag?

Right now we have a dynamic list of products with a quantity field and a add to cart button in a table. I want to make the whole thing a form with a add all button at the end like this:

<form #form="ngForm">
    <div *ngFor="item in items">
        <input name="product-{{item.id}}"
               [(ngModel)]="item.qty"
               #????="ngModel"
               validateQuantity>
        <button (click)="addItemToCart(item)"
                [disabled]="!????.valid">Add to cart</button>
    </div>
    <button (click)="addAll()"
            [disabled]="!form.valid">Add all</button>
</form>

But how can i generate a new variable name per row for the ngModel?

解决方案

There's no need for this, just do it like this:

<form #form="ngForm">
    <div *ngFor="item in items">
        <input name="product-{{item.id}}"
               [(ngModel)]="item.qty"
               validateQuantity
               #qtyInput>
        <button (click)="addItemToCart(item)"
                [disabled]="!qtyInput.valid">Add to cart</button>
    </div>
    <button (click)="addAll()"
            [disabled]="!form.valid">Add all</button>
</form>

Its Angular's part here. :)

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