Angular issue: Readonly or disabled input fields not submitting data

Question

Angular issue: Readonly or disabled input fields not submitting data

Struggling with creating a form in Angular 2 to submit dynamically generated values from a service. The goal is to calculate the equivalent amount of bitcoin for X chilean pesos using Angular's http module to fetch the price. However, facing an issue where disabled or readonly inputs are not being submitted by angular forms – specifically the exchange rate and target amount (in btc).

Attempted both template-driven and data-driven approaches without success. Values are not logged to console unless disabled/readonly properties are removed from inputs.

Appreciate any assistance on this. Below is the code snippet:

component.ts

// Component logic here
// Code commented out for brevity

In the code provided, note that the data-driven approach is used only in the form submission function.

html:

<form (ngSubmit)="onSub(f)" #f="ngForm">
          <div class="form-group">
            // HTML input fields here
          </div>
          <button md-raised-button type="submit" color="primary" class="btn-w-md">Confirm</button><div class="divider divider-sm"></div>
        </form>

Thanks again!

EDIT!!!:

data driven html:

<form [formGroup]="myForm2" (ngSubmit)="onSub()">
              <div class="form-group">
                // Data-driven form fields here
              </div>
              <button md-raised-button type="submit" color="primary" class="btn-w-md">Confirm</button><div class="divider divider-sm"></div>
            </form>

angular typescript angular-forms

Answer 1

Answer №1

If you're looking to retrieve all form values, including the disabled ones, you can utilize getRawValue().

For example, if your form is structured like this:

this.myForm2 = this.fb.group({
  email: ['', Validators.email],
  clpmount: ['', Validators.required],
  btcmount: [{value: '', disabled: true}],
  ....
});

You can simply use

this.myForm2.getRawValue()

This will provide you with the value of btcmount in the above scenario.

UPDATE:

After reviewing the template... In reactive forms, Angular does not recognize the value and [value] bindings. To work around this issue, it's recommended to utilize one-way binding by using [ngModel]="baseAmount" for your field clpAmount. Why? The ngModel directive is not part of the ReactiveFormsModule, indicating that they are not intended to be used together even though it's not explicitly stated in the documentation. Using [(ngModel)] concurrently could result in two conflicting bindings, potentially causing complications.

[ngModel] offers a better approach as Angular strictly binds the value from TypeScript to the template without concerning itself with subsequent actions. Despite reactive forms disregarding value, it still acknowledges ngModel, making it suitable for this situation! Thus, replace [value] with [ngModel]:

<input mdInput  formControlName="btcmount" [ngModel]="targetAmount | number:'1.8-8'">

<input mdInput formControlName="rate" placeholder="Tasa de cambio" [ngModel]="exchangeRate | number:'1.0-0'">

By making this adjustment, all values will be accessible when utilizing getRawValue() :)

Answer 2

If you're looking to retrieve all form values, including the disabled ones, you can utilize getRawValue().

For example, if your form is structured like this:

this.myForm2 = this.fb.group({
  email: ['', Validators.email],
  clpmount: ['', Validators.required],
  btcmount: [{value: '', disabled: true}],
  ....
});

You can simply use

this.myForm2.getRawValue()

This will provide you with the value of btcmount in the above scenario.

UPDATE:

After reviewing the template... In reactive forms, Angular does not recognize the value and [value] bindings. To work around this issue, it's recommended to utilize one-way binding by using [ngModel]="baseAmount" for your field clpAmount. Why? The ngModel directive is not part of the ReactiveFormsModule, indicating that they are not intended to be used together even though it's not explicitly stated in the documentation. Using [(ngModel)] concurrently could result in two conflicting bindings, potentially causing complications.

[ngModel] offers a better approach as Angular strictly binds the value from TypeScript to the template without concerning itself with subsequent actions. Despite reactive forms disregarding value, it still acknowledges ngModel, making it suitable for this situation! Thus, replace [value] with [ngModel]:

<input mdInput  formControlName="btcmount" [ngModel]="targetAmount | number:'1.8-8'">

<input mdInput formControlName="rate" placeholder="Tasa de cambio" [ngModel]="exchangeRate | number:'1.0-0'">

By making this adjustment, all values will be accessible when utilizing getRawValue() :)

Answer 3

Answer №2

If you need to retrieve all form values

Update this function

onSub() {
 console.log(this.info);
}

to

import { NgForm } from '@angular/forms';

onSub(formData : NgForm) {
 console.log(formData.value);
}

Issue with Readonly/Disabled input submission in Angular

Disabled inputs will not be submitted However, Readonly inputs will always be included in the submitted form

The problem lies within your code, not Angular itself.

Answer 4

If you need to retrieve all form values

Update this function

onSub() {
 console.log(this.info);
}

to

import { NgForm } from '@angular/forms';

onSub(formData : NgForm) {
 console.log(formData.value);
}

Issue with Readonly/Disabled input submission in Angular

Disabled inputs will not be submitted However, Readonly inputs will always be included in the submitted form

The problem lies within your code, not Angular itself.

Answer 5

Answer №3

Building on Vivek's explanation, when using a reactive form, you can achieve it in the following way:

this.myForm = this.fb.group({
      email: ['', Validators.email],
      amount: ['', Validators.required],
      btcAmount: [''],
      rate: [''],
      description: ['']
});

Additionally, you can handle the form submission like this:

public onSubmit() {
  console.log(this.myForm.value);
}

Alternatively, for tracking changes:

ngOnInit() {
  ...
  this.form.valueChanges.subscribe(value => console.log(value));
}

The key is to extract data directly from the form itself rather than relying on the model. This principle applies to both reactive and model-driven forms as described by Vivek (passing in the form instead of the model).

Answer 6

Building on Vivek's explanation, when using a reactive form, you can achieve it in the following way:

this.myForm = this.fb.group({
      email: ['', Validators.email],
      amount: ['', Validators.required],
      btcAmount: [''],
      rate: [''],
      description: ['']
});

Additionally, you can handle the form submission like this:

public onSubmit() {
  console.log(this.myForm.value);
}

Alternatively, for tracking changes:

ngOnInit() {
  ...
  this.form.valueChanges.subscribe(value => console.log(value));
}

The key is to extract data directly from the form itself rather than relying on the model. This principle applies to both reactive and model-driven forms as described by Vivek (passing in the form instead of the model).

Angular issue: Readonly or disabled input fields not submitting data

Answer №1

Answer №2

Answer №3

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