Retain Form data even when the user refreshes or reloads the page

Question

Retain Form data even when the user refreshes or reloads the page

My Form includes validation as shown below:

<form  [formGroup]="LoginForm">
  First name:<br>
  <input type="text" formControlName="firstname" >
  <br>
  Last name:<br>
  <input type="text" formControlName="lastname">
  <button  type="submit"  [disabled]="!this.LoginForm.valid"></button>
</form>

component.ts

LoginForm: FormGroup;

onloginUser() {
    this.LoginForm = this.form.group({
      firstname: ['', Validators.required],
      lastname: ['', Validators.required],
    })
  }

I implemented a local storage service with the following code,

this.storage.set("user_data",this.LoginForm.value);
this.storage.get("user_data");

The issue I am facing is that when a user reloads the page or navigates back/forward, the data should remain in the input fields. However, the above code is not achieving this.

I have already checked the suggestions on stackoverflow at the following link: link, but none of the answers provided a solution for my specific case. Can anyone offer a better answer that would be helpful to me?

angular typescript

Answer 1

Answer №1

This is the TypeScript code I've prepared for this particular query

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';

@Component({
  selector: 'app-reload',
  templateUrl: './reload.component.html',
  styleUrls: ['./reload.component.css']
})

export class ReloadComponent  {    
    LoginForm: FormGroup;

    constructor(private FB: FormBuilder ) { 

    // 1 - Retrieving values from local storage
    const value = JSON.parse(localStorage.getItem('formValue')!);

    // 2 - Initializing form with saved values
    this.LoginForm = FB.group({
      firstname: [value && value.firstname || '', Validators.required],
      lastname: [value && value.lastname || '', Validators.required]
    });
  
    // 3 - Updating local storage on every change
    this.LoginForm.valueChanges.subscribe(value => {
      localStorage.setItem('formValue', JSON.stringify(this.LoginForm.value));
    });
  }
}

Answer 2

This is the TypeScript code I've prepared for this particular query

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';

@Component({
  selector: 'app-reload',
  templateUrl: './reload.component.html',
  styleUrls: ['./reload.component.css']
})

export class ReloadComponent  {    
    LoginForm: FormGroup;

    constructor(private FB: FormBuilder ) { 

    // 1 - Retrieving values from local storage
    const value = JSON.parse(localStorage.getItem('formValue')!);

    // 2 - Initializing form with saved values
    this.LoginForm = FB.group({
      firstname: [value && value.firstname || '', Validators.required],
      lastname: [value && value.lastname || '', Validators.required]
    });
  
    // 3 - Updating local storage on every change
    this.LoginForm.valueChanges.subscribe(value => {
      localStorage.setItem('formValue', JSON.stringify(this.LoginForm.value));
    });
  }
}

Answer 3

Answer №2

Make sure to assign a value to your form during initialization.

this.LoginForm.patchValue(this.storage.get("user_data"));

This code will function correctly if the storage service returns an object.

Answer 4

Make sure to assign a value to your form during initialization.

this.LoginForm.patchValue(this.storage.get("user_data"));

This code will function correctly if the storage service returns an object.

Answer 5

Answer №3

Whenever you navigate the component, it is recreated along with the form. Make sure to verify if there is any data in the local storage. If there is, assign it to the form after it has been created.

Answer 6

Whenever you navigate the component, it is recreated along with the form. Make sure to verify if there is any data in the local storage. If there is, assign it to the form after it has been created.

Retain Form data even when the user refreshes or reloads the page

Answer №1

Answer №2

Answer №3

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