Steps to Validate a Form: To allow the submit button to be enabled only when all input fields are filled out; if any field is left empty,

https://i.sstatic.net/AHlJX.png

Is it possible to enable the send offer button only after both input boxes are filled?

I'm sharing my code base with you for reference.

Please review the code and make necessary modifications on stackblitz

1. example-dialog.component.html

<form id="bidForm" #bidForm="ngForm">
  <div class="form-row">
    <div class="form-group col-md-6">
      <label for="inputQuantity">Quantity</label>
      <input
        type="number"
        name="quantity"
        class="form-control"
        id="inputQuantity"
        placeholder="Quantity(QTL)*"
        required
      />
    </div>
    <div class="form-group col-md-6">
      <label for="inputPrice">Price</label>
      <input
        type="number"
        class="form-control"
        id="inputPrice"
        placeholder="Price(₹/QTL)"
        required
      />
    </div>
  </div>

  <button
    type="submit"
    class="btn btn-primary btn-lg btn-block"
    [disabled]="!bidForm.form.valid"
  >
    Send offer
  </button>
</form>

2. example-dialog.component.ts

import { Component, Inject, ViewChild } from '@angular/core';
import { NgForm } from '@angular/forms';
import { MatDialogRef, MAT_DIALOG_DATA } from "@angular/material/dialog";;

@Component({
  selector: 'app-example-dialog',
  templateUrl: 'example-dialog.component.html',
})
export class ExampleDialogComponent {

  ngOnInit() {

  }


  constructor(
    public dialogRef: MatDialogRef<ExampleDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any) { }


  onNoClick(): void {
    this.dialogRef.close();
  }


}

Answer №1

Angular offers a FormBuilder that can enhance the aesthetics and interactivity of your forms. It is part of the ReactiveFormsModule, so be sure to explore its capabilities. You can implement validation using Validators.required for a specific control and then assess the overall validity of the group when submitting.

EDIT (example included):

Here is a basic usage scenario:

 bidForm: FormGroup;
 constructor(private fb: FormBuilder) { this.createForm() }
 
 private createForm() {
     this.bidForm = this.fb({
         // Multiple validators can be utilized here
         quantity: new FormControl(null, [Validators.required]),
         inputPrice: new FormControl(null, [Validators.required])
     })
 }

When it comes to the HTML implementation:

<form [formGroup]="bidForm"
      (ngSubmit)="bidForm.valid && submit()">
 <input type="number"
    formControlName="quantity"
    name="quantity"
    class="form-control"
    id="inputQuantity"
    placeholder="Quantity(QTL)*"/>
  
    /.../

    <button type="submit"
        class="btn btn-primary btn-lg btn-block"
        [disabled]="bidForm.invalid">
       Send offer
    </button>

</form>

Answer №2

Implementing this feature using the Reactive Form module is quite simple. The reactive form includes a validation method called "required", which ensures that the form remains invalid until all necessary information is provided.

To start, you need to import the Reactive Form module into your app.module.ts file:

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

@NgModule({
  declarations: [],
  imports: [
    ReactiveFormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Next, you'll need to define and implement your form validations within your class file. Here's an example code snippet:

import { Component, Inject, ViewChild } from '@angular/core';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { MatDialogRef, MAT_DIALOG_DATA } from "@angular/material/dialog";

@Component({
  selector: 'app-example-dialog',
  templateUrl: 'example-dialog.component.html',
})
export class ExampleDialogComponent {

  ngOnInit() {
  }

bidForm = new FormGroup({
inputQuantity: new FormControl('', [Validators.required]),
inputPrice: new FormControl('', [Validators.required])
 });

  constructor(
    public dialogRef: MatDialogRef<ExampleDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any) { }

  onNoClick(): void {
    this.dialogRef.close();
  }
}

Your template should resemble something like this:

<form [formGroup]="bidForm">
    <div class="form-row">
      <div class="form-group col-md-6">
        <label for="inputQuantity">Quantity</label>
        <input [formControl]="inputQuantity"
          type="number"
          name="quantity"
          class="form-control"
          id="inputQuantity"
          placeholder="Quantity(QTL)*"
        />
      </div>
      <div class="form-group col-md-6">
        <label for="inputPrice">Price</label>
        <input [formControl]="inputPrice"
          type="number"
          class="form-control"
          id="inputPrice"
          placeholder="Price(₹/QTL)"
          required
        />
      </div>
    </div>
  
    <button
      type="submit"
      class="btn btn-primary btn-lg btn-block"
      [disabled]="!bidForm.form.valid"
    >
      Send offer
    </button>
  </form>

It's important to note that you can't simply copy and paste these codes without making necessary adjustments for your specific requirements. Ensure that you pay attention to imports, form groups, and form controls in both the class file and template file. Feel free to customize this code as needed and refer to Angular Reactive Forms documentation for further guidance.

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