FormControlName 不适用于 ion-radio [英] FormControlName not working with ion-radio

问题描述

新:

所以我可以让它在没有无线电组或没有正确绑定的情况下工作.我不能让它与两者一起工作.

这是允许的:

<ion-list radio-group [formControlName]="'col'+j"><ion-radio></ion-radio></ion-list>

但是我没有包含广播组的列表，无论我更改什么，它总是会中断.如果我将列表移到它的外面，请移动它断开的 formControlName.我真的不知道如何让它发挥作用.

我认为这应该是要走的路:

<div *ngFor="let 列的列；让 j = 索引"><div [formControlName]="'col'+j"><ion-radio></ion-radio>

</ion-list>

但同样的错误:

<块引用>

错误:没有用于具有路径的表单控件的值访问器:'rows -> 0 -> col0'

i = 我需要的行数.j = 我需要的选项/问题的数量.

旧的:

我正在尝试使用 ion-radio 作为表单组中的输入字段，但它一直给我错误:

<块引用>

没有用于带有路径的表单控件的值访问器...

所以我切换到 type="radio" 的输入，但是如果我想将它们分组，我需要给它们相同的名称，我不能这样做，因为我使用的是 *ngFor 否则我的 formControlName 是不再正确.

谁能帮我让离子无线电工作?分组看起来更好更容易.

<ion-col *ngFor="let column of columns; let j = index"><input value="X" formControlName="col{{j + 1}}" type="radio"/><!-- <ion-radio value="X"></ion-radio>--></ion-col></ion-col>

创作:

this.inspectionTableForm = this.formBuilder.group({标题:this.formBuilder.group({标题:[this.question.properties.header[0]]，列:this.formBuilder.array([this.formBuilder.control('')]),注释: ['']}),行:this.formBuilder.array([this.initRow()])});私人 initRow() {//创建温度控制让 tempControl = this.formBuilder.group({标题: ''，});//为列创建一个数组让 arr = [];for (let index = 0; index < this.question.properties["number-of-columns"]; index++) {//将一个控件推送到数组，也推送一个控件到更高级别的值arr.push(this.columns[index])tempControl.addControl(`col${index}`, this.formBuilder.control(''))//Col-1-2-3};tempControl.addControl('columns', this.formBuilder.array(arr))//数组//检查我们是否需要添加评论字段如果 (this.question.properties["comment-field"]) {tempControl.addControl('comment', this.formBuilder.control(''))}返回温度控制；}

编辑半工作的新代码(感谢 xrobert35):

<ion-item *ngFor="let column of row.controls.columns.controls"><ion-radio></ion-radio></ion-item></ion-col>

这是我按第一个选项，然后是第二个和第三个选项时得到的结果:

它用一些奇怪的值更新相同的列.我认为问题在于我不需要 i 作为索引而是 j，但是当我这样做时它会中断.像这样:

<ion-item *ngFor="let column of row.controls.columns.controls; let j = index" [formControlName]="'col'+j"><ion-radio></ion-radio></ion-item></ion-col>

<块引用>

没有路径的表单控件的值访问器:'rows -> 0 -> col0'

解决方案

您不能将指令 formControlName 与 ion-radio 一起使用，因为您只能在与 ngModel 一起使用的组件上使用它.

我知道您想要一个 ion-radio 列表，但只有一个值绑定到 formGroup 中.因此，您可以使用文档中的 ion-list 组件?并将 [(ngModel)] 替换为 formGroupName

<离子项目><ion-label>朋友</ion-label><ion-radio value="friends"checked></ion-radio></ion-item><离子项目><ion-label>Family</ion-label><ion-radio value="family"></ion-radio></ion-item><离子项目><ion-label>敌人</ion-label><ion-radio value="enemies" [disabled]="isDisabled"></ion-radio></ion-item></ion-list>

https://ionicframework.com/docs/api/components/radio/单选按钮/

新代码你的 html 应该像这样

<div *ngFor"let question of questions; let indexRow=index" class="row" formArrayName="rows"><跨度>{{question.libelle}} </span><ion-list radio-group [formControlName]="'answer'+indexRow"><ion-item *ngFor="let answer of question.answers"><ion-label>{{answer.labelle}}</ion-label><ion-radio [value]="answer.value"></ion-radio></ion-item></ion-list><textarea formControlName="comment">

New:

So I can get it to work withou a radio-group or withouth the right bindings. I can't get it to work with both.

This is allowed:

<div *ngFor="let column of row.controls.columns.controls; let j = index">
                <ion-list radio-group [formControlName]="'col'+j">
                    <ion-radio></ion-radio>
                </ion-list>
            </div>

But then I don't have a list with a radio-group, it doesn't matter what I change it will always break. If I move the list outside it breaks, move the formControlName it breaks. I really don't know how to get this to work.

I would think that this should be the way to go:

<ion-list radio-group>
            <div *ngFor="let column of columns; let j = index">
                <div [formControlName]="'col'+j">
                    <ion-radio></ion-radio>
                </div>
            </div>
        </ion-list>

But again the same error:

Error: No value accessor for form control with path: 'rows -> 0 -> col0'

i = the amount of rows I need. j = the amount of options/questions I need.

Old:

I am trying to use the ion-radio as a input field in a formgroup but it keeps giving me the error:

No value accessor for form control with path ...

So I switched to an input with type="radio", but if I want to group those, I need to give them the same name, which I can't because I am using a *ngFor and otherwise my formControlName is not correct anymore.

Can anybody help me to get the ion-radio to work? It would look better and easier to group.

<ion-col radio-group class="radioGroup" col-6>
   <ion-col *ngFor="let column of columns; let j = index">
        <input value="X" formControlName="col{{j + 1}}" type="radio" />
        <!-- <ion-radio value="X"></ion-radio> -->
    </ion-col>
</ion-col>

Creation:

this.inspectionTableForm = this.formBuilder.group({
    header: this.formBuilder.group({
        title: [this.question.properties.header[0]],
        columns: this.formBuilder.array([
                    this.formBuilder.control('')
                ]),
        comments: ['']
    }),
    rows: this.formBuilder.array([
        this.initRow()
    ])
});

private initRow() {
    // Create the temp control
    let tempControl = this.formBuilder.group({
        title: '',
    });

    // Create an array for the columns
    let arr = [];
    for (let index = 0; index < this.question.properties["number-of-columns"]; index++) {
        // Push a control to the array and also one for the value on a higher level
        arr.push(this.columns[index])
        tempControl.addControl(`col${index}`, this.formBuilder.control('')) // Col-1-2-3
    };
    tempControl.addControl('columns', this.formBuilder.array(arr)) //Array

    // Check if we need to add the comment field
    if (this.question.properties["comment-field"]) {
        tempControl.addControl('comment', this.formBuilder.control(''))
    }
    return tempControl;
}

Edit semi working new code (thanks xrobert35):

<ion-col radio-group [formControlName]="'col'+i">
    <ion-item *ngFor="let column of row.controls.columns.controls">
        <ion-radio></ion-radio>
    </ion-item>
</ion-col>

This is what I get when I press the first option, then second and then third:

It updates the same col with some weird value. I think the problem is that I do not need i as index but j, but it breaks when I do that. Something like this:

<ion-col radio-group >
    <ion-item *ngFor="let column of row.controls.columns.controls; let j = index" [formControlName]="'col'+j">
        <ion-radio></ion-radio>
    </ion-item>
</ion-col>

No value accessor for form control with path: 'rows -> 0 -> col0'

解决方案

You can't use the directive formControlName with ion-radio cause you can only use it on a component which work with ngModel.

I understand that you want a list of ion-radio but only one value bind into the formGroup. So you can use a ion-list component like in the documentation ? and replace the [(ngModel)] by formGroupName

<ion-list radio-group formControlName="myFormGroupName">
  <ion-item>
    <ion-label>Friends</ion-label>
    <ion-radio value="friends" checked></ion-radio>
  </ion-item>
  <ion-item>
    <ion-label>Family</ion-label>
    <ion-radio value="family"></ion-radio>
  </ion-item>
  <ion-item>
    <ion-label>Enemies</ion-label>
    <ion-radio value="enemies" [disabled]="isDisabled"></ion-radio>
  </ion-item>
</ion-list>

https://ionicframework.com/docs/api/components/radio/RadioButton/

New code Your html should look like something like this

<div [fromGroup]="inspectionTableForm">

<div *ngFor"let question of questions; let indexRow=index" class="row" formArrayName="rows">
   <span> {{question.libelle}} </span>
   <ion-list radio-group [formControlName]="'answer'+indexRow">
       <ion-item *ngFor="let answer of question.answers">
           <ion-label>{{answer.labelle}}</ion-label>
           <ion-radio [value]="answer.value"></ion-radio>
       </ion-item>
   </ion-list>
   <textarea formControlName="comment">
</div>

</div>

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