TR子组件内部的Angular2 FormGroup [英] Angular2 FormGroup inside TR child component

问题描述

我在表中有一个*ngFor子行组件，需要用FormGroup包装.像这样的东西.

I have an *ngFor child row component in a table that I need to wrap with a FormGroup. Something like this.

<tr [formGroup]='dependentForm'>
  <td>
    <input type="text"  formControlName="first_name">
  </td>
  <td>
    <input type="text"  formControlName="last_name">
  </td>
  <td>
    <input type="text" formControlName="dob">
  </td>
</tr>

但是我不知道如何从父模板中加载组件，而又不会弄乱标题列的对齐方式.

But I can't figure out how to load the component from the parent template without it messing up the header columns alignment.

我尝试了使用元素选择器和属性选择器，但似乎都存在障碍.如果我使用属性选择器<tr dependent-row>并从子级中删除tr，那么我将无法在input周围包裹任何内容以将formGroup分配给它，否则会弄乱列.如果我使用元素选择器<dependent-row></dependent-row>并将tr放在上面的示例中的子组件中，则仅列出所有tr内联，只会使表变得更糟.

I've tried with an element selector and an attribute selector but there seems to be a roadblock either way. If I use an attribute selector, <tr dependent-row>, and remove the tr from the child I then can't wrap anything around my inputs to assign a formGroup to or it messes up the columns. If I use an element selector <dependent-row></dependent-row> and put the tr inside the child component like the sample above, that just makes the table even worse by just listing all the trs inline.

我希望我已经很好地描述了我的问题.感谢您的光临！

I hope I've described my problem well enough. Thanks for looking!

更新

这是一个使用属性选择器的示例. dependent-row组件中的tr标记使表格列脱离了，但是我需要添加一些formGroup到这里，所以我不确定如何正确地处理它.

Here's an example using an attribute selector. The tr tags in the dependent-row component are throwing off the table columns but I need something to add a formGroup to so I'm not sure how to properly handle this.

https://plnkr.co/edit/oXxkUGKtVp0T1u4Qz8AX?p=preview

这是使用元素选择器的另一种方法.

Here is the alternative method using an element selector.

https://plnkr.co/edit/qSLP5kVPLIWYdT19qset?p=preview

推荐答案

我找到了解决方法，但不确定是否会引起任何副作用.我毕竟不是餐桌旁的人.

I found a fix, but not sure if it causes any side effect. I'm not the table man after all.

我认为问题是因为您嵌套了<tr>，所以我将外部<tr>更改为<tbody>:

I think the problem is because you have nested <tr>, so I changed the outer <tr> to <tbody>:

<tbody dependent-row *ngFor="let dependent of dependents"
    [dependent]='dependent' >

Plnkr: https://plnkr.co/edit/xxiGTcQvUaLruj9DIU5w?p=preview

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