离子2离子选择不发送给环境的价值 [英] ionic 2 ion-select not sending value to formbuilder

问题描述

我在离子2中使用formbuilder，但在使用formControlName时遇到了ion-select指令的问题。
所有数据都被转发到firebase，在这些值被设置。

这里是摘录从HTML

 < ion-item fromGroupName =carDetails> 
<离子标签浮动>汽车制造< /离子标签> 
< ion-select #carMake（change）=elementChanged（carMake）formControlName =carMake> 
< ion-option value =fordselected>福特< / ion-option> 
< ion-option value =bmw> BMW< / ion-option> 
< ion-option value =mercedes> Mercedes< / ion-option> 
< / ion-select> 
< / ion-item> 
 
< ion-item formGroupName =carDetails> 
<离子标签浮动>汽车模型< /离子标签> 
< ion-input #carModel formControlName =carModeltype =text（change）=elementChanged（carModel）
 [class.invalid] =！slideTwoForm.controls.carDetails.controls .carModel.valid&&（carModelChanged || submitAttempt）>< / ion-input> 
< / ion-item> 
< ion-item * ngIf =！slideTwoForm.controls.carDetails.controls.carModel.valid&&（carModelChanged || submitAttempt）> 
< p>请输入有效的车型。< / p> 
< / ion-item> 
 
< ion-item formGroupName =carDetails> 
<离子标签浮动>车年< /离子标签> 
 < / ion-item> 
  

以下是.ts文件的摘录

  this.slideTwoForm = formBuilder.group（[Validators.maxLength（11），Validators.pattern（'[0 -9] *'），Validators.required]）]，
 drivingCredentials：this.formBuilder.group（{
 drivingLicense：['']，
 expirationDate：['']，$ （
 carMake：['']，
 carModel：['']，
 carYear：['' ]，
 carColor：['']，
}），
 password：[''，Validators.compose（[Validators.minLength（6），Validators.required]）] 
}）; 
  

现在，carModel和carYear工作正常，并使用formControlName ，但carMake在使用formControlName时出错，错误：

  polyfills.js：3 Uncaught ViewWrappedError {_nativeError：错误：./SignUpPage类中的错误SignUpPage  - 内联模板：134：70由以下原因引起：无法找到控制...，originalError：错误：无法在_throwError中找到名称为'carMake'
的控件（http：/ / localhost：8100 / build / main ...，context：DebugContext} 
  

我尝试使用ngControl而不是formControlName但值是空的。

< img src =https://i.stack.imgur.com/qzJrQ.pngalt =在这里输入图片描述>

没有人还有其他面临这样的问题，当离子选择在离子2 formbuilder吗？

解决方案

我终于解决了我在离子选择和formControlName之间的问题，这要感谢 =nofollow noreferrer> http://www.joshmorony.com/advanced-forms-validation-in-ionic-2/

我看到对于离子选择，html造成问题的html有点不同：

 < ion-item fromGroupName = carDetails > 
<离子标签浮动>汽车制造< /离子标签> 
< ion-select #carMake（change）=elementChanged（carMake）formControlName =carMake> 
< ion-option value =fordselected>福特< / ion-option> 
< ion-option value =bmw> BMW< / ion-option> 
< ion-option value =mercedes> Mercedes< / ion-option> 
< / ion-select> 
< / ion-item> 
  

离子选择的新html：

 < ion-item formGroupName =carDetails> 
<离子标签浮动>汽车制造< /离子标签> 
< ion-select [class.invalid] =！slideTwoForm.controls.carDetails.controls.carMake.valid 
&&（slideTwoForm.controls.carDetails.controls.carMake.dirty || submitAttempt）formControlName =carMake> 
< ion-option value =fordselected>福特< / ion-option> 
< ion-option value =bmw> BMW< / ion-option> 
< ion-option value =mercedes> Mercedes< / ion-option> 
< / ion-select> 
< / ion-item> 
  

现在我没有收到任何错误，所选的值被传递给数据库及其工作完美。再次感谢 http://www.joshmorony.com/advanced -forms-validation-in-ionic-2 / 更新他的文章

I'm using formbuilder in ionic 2 but facing problems with the ion-select directive when using formControlName with it. All the data is being forwarded to firebase where these values are being set.

here's an extract from the html

<ion-item fromGroupName="carDetails">
          <ion-label floating>car make</ion-label>
          <ion-select #carMake (change)="elementChanged(carMake)" formControlName="carMake">
            <ion-option value="ford" selected>Ford</ion-option>
            <ion-option value="bmw">BMW</ion-option>
            <ion-option value="mercedes">Mercedes</ion-option>
          </ion-select>
        </ion-item>

<ion-item formGroupName="carDetails">
          <ion-label floating>car model</ion-label>
          <ion-input #carModel formControlName="carModel" type="text" (change)="elementChanged(carModel)"
          [class.invalid]="!slideTwoForm.controls.carDetails.controls.carModel.valid && (carModelChanged || submitAttempt)"></ion-input>
        </ion-item>
        <ion-item *ngIf="!slideTwoForm.controls.carDetails.controls.carModel.valid  && (carModelChanged || submitAttempt)">
          <p>Please enter a valid car model.</p>
        </ion-item>

<ion-item formGroupName="carDetails">
          <ion-label floating>car year</ion-label>
          <ion-datetime #carYear formControlName="carYear" displayFormat="YYYY" (change)="elementChanged(carYear)" ngControl="carYear"></ion-datetime>
        </ion-item>

and here's an extract from the .ts file

this.slideTwoForm = formBuilder.group({
    ssn: ['', Validators.compose([Validators.maxLength(11), Validators.pattern('[0-9]*'), Validators.required])],
    drivingCredentials: this.formBuilder.group({
      drivingLicense: [''],
      expirationDate: [''],
    }),
    carDetails: this.formBuilder.group({
      carMake: [''],
      carModel: [''],
      carYear: [''],
      carColor: [''],
    }),
    password: ['', Validators.compose([Validators.minLength(6), Validators.required])]
  });

Now, the "carModel" and "carYear" are working flawlessly and sending their value when using "formControlName", but "carMake" is giving an error when using "formControlName", the error:

polyfills.js:3 Uncaught ViewWrappedError {_nativeError: Error: Error in ./SignUpPage class SignUpPage - inline template:134:70 caused by: Cannot find contro…, originalError: Error: Cannot find control with name: 'carMake'
at _throwError (http://localhost:8100/build/main…, context: DebugContext}

I tried using ngControl instead of formControlName but the values are empty.

did anyone else faced problems like this when sing ion-select in ionic 2 formbuilder?

解决方案

I finally solved the issue i was having between "ion-select" and "formControlName", thanks to http://www.joshmorony.com/advanced-forms-validation-in-ionic-2/

I saw that the html is a bit different for ion-select, the old html which was causing problems:

<ion-item fromGroupName="carDetails">
      <ion-label floating>car make</ion-label>
      <ion-select #carMake (change)="elementChanged(carMake)" formControlName="carMake">
        <ion-option value="ford" selected>Ford</ion-option>
        <ion-option value="bmw">BMW</ion-option>
        <ion-option value="mercedes">Mercedes</ion-option>
      </ion-select>
    </ion-item>

The new html for ion-select:

<ion-item formGroupName="carDetails">
            <ion-label floating>car make</ion-label>
            <ion-select [class.invalid]="!slideTwoForm.controls.carDetails.controls.carMake.valid
            && (slideTwoForm.controls.carDetails.controls.carMake.dirty || submitAttempt)" formControlName="carMake">
            <ion-option  value="ford" selected>Ford</ion-option>
            <ion-option  value="bmw">BMW</ion-option>
            <ion-option  value="mercedes">Mercedes</ion-option>
          </ion-select>
        </ion-item>

Now I'm not getting any errors, the selected value is being passed to the database and its working perfectly. Once again thanks to http://www.joshmorony.com/advanced-forms-validation-in-ionic-2/ for updating his article

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