I'm having trouble retrieving the value from the textbox in my Angular 7 project using TypeScript

Question

I'm having trouble retrieving the value from the textbox in my Angular 7 project using TypeScript

I'm currently working with Angular 7 and trying to create a textbox to display its value in an alert. However, I'm facing difficulty in fetching the textbox value in typescript. I would appreciate any guidance on how to proceed with this issue.

about.component.html

<input type="text" name="username">
<button (click)="lgbtnclick()" type="button" name="button"></button>

about.component.ts

  import { Component, OnInit } from '@angular/core';
  @Component({
  selector: 'app-about',
  templateUrl: './about.component.html',
  styleUrls: ['./about.component.scss']
  })

  export class AboutComponent implements OnInit {
   name : string;

   constructor() { }

   ngOnInit() {
   }

   lgbtnclick(){
      alert(this.name)
      console.log(Error)
   }
}

The alert message shows:

undefined

angular typescript scripting

Answer 1

Answer №1

To set the default value of the name property to "", simply use [(ngModel)]="name" for the input field.

Here is the HTML code:

<mat-form-field class="example-full-width">
  <input matInput placeholder="Enter name" [(ngModel)]="name" >
</mat-form-field>

<button (click)="lgbtnclick()" type="button" name="button">Test</button>

And the TypeScript code:

import { Component } from '@angular/core';

@Component({
  selector: 'input-overview-example',
  styleUrls: ['input-overview-example.css'],
  templateUrl: 'input-overview-example.html',
})
export class InputOverviewExample {
  name: string="";

  constructor() { }

  ngOnInit() {
  }

  lgbtnclick() {
    alert(this.name)
    console.log(Error)
  }
}

Check it out on Stackblitz

Answer 2

To set the default value of the name property to "", simply use [(ngModel)]="name" for the input field.

Here is the HTML code:

<mat-form-field class="example-full-width">
  <input matInput placeholder="Enter name" [(ngModel)]="name" >
</mat-form-field>

<button (click)="lgbtnclick()" type="button" name="button">Test</button>

And the TypeScript code:

import { Component } from '@angular/core';

@Component({
  selector: 'input-overview-example',
  styleUrls: ['input-overview-example.css'],
  templateUrl: 'input-overview-example.html',
})
export class InputOverviewExample {
  name: string="";

  constructor() { }

  ngOnInit() {
  }

  lgbtnclick() {
    alert(this.name)
    console.log(Error)
  }
}

Check it out on Stackblitz

Answer 3

Answer №2

Angular's approach to data binding sets it apart from jQuery or plain JavaScript. Using the "name" attribute of the input element won't yield the desired results. For a better understanding, check out either Reactive Forms or Template driven Forms.

In your scenario, the template driven form can be utilized. Angular facilitates binding the value of an input to that of a class instance variable using [(ngModel)]="name". While not recommended, the [ and ( denote property and event binding, establishing a two-way data binding. Learn more about this concept here.

To employ the ngModel directive, ensure you include the FormsModule in the relevant module.

The HTML snippet:

<input matInput placeholder="Enter name" [(ngModel)]="name" >
<button (click)="lgbtnclick()" type="button" name="button"></button>

The Typescript code:

import { Component } from '@angular/core';

@Component({
  selector: 'app-about',
  styleUrls: ['about.component.css'],
  templateUrl: 'about.component.html',
})
export class AboutComponent {
  name: string="";

  constructor() { }

  lgbtnclick() {
    alert(this.name)
    console.log(Error)
  }
}

Answer 4

Angular's approach to data binding sets it apart from jQuery or plain JavaScript. Using the "name" attribute of the input element won't yield the desired results. For a better understanding, check out either Reactive Forms or Template driven Forms.

In your scenario, the template driven form can be utilized. Angular facilitates binding the value of an input to that of a class instance variable using [(ngModel)]="name". While not recommended, the [ and ( denote property and event binding, establishing a two-way data binding. Learn more about this concept here.

To employ the ngModel directive, ensure you include the FormsModule in the relevant module.

The HTML snippet:

<input matInput placeholder="Enter name" [(ngModel)]="name" >
<button (click)="lgbtnclick()" type="button" name="button"></button>

The Typescript code:

import { Component } from '@angular/core';

@Component({
  selector: 'app-about',
  styleUrls: ['about.component.css'],
  templateUrl: 'about.component.html',
})
export class AboutComponent {
  name: string="";

  constructor() { }

  lgbtnclick() {
    alert(this.name)
    console.log(Error)
  }
}

Answer 5

Answer №3

Hey there! The name attribute in your HTML code isn't directly linked to your TypeScript file. It's simply an attribute on the HTMLElement. If you need that value to be accessible, there are several options available. The easiest solution is to assign the name variable to the value attribute of the input element or use ngModel (remember to import ReactiveFormsModule and FormsModule in your AppModule)

Solution Using Value Attribute

HTML

<input type="text" name="username" [value]="name">
<button (click)="lgbtnclick()" type="button" name="button"></button>

TypeScript

import { Component, OnInit } from "@angular/core";
@Component({
  selector: "app-about",
  templateUrl: "./about.component.html",
  styleUrls: ["./about.component.scss"]
})
export class AboutComponent implements OnInit {
  name: string;
  constructor() {}

  ngOnInit() {}

  lgbtnclick() {
    alert(this.name);
    console.log(Error);
  }
}

Solution Using ngModel

HTML

<input type="text" name="username" [(ngModel)]="name">
<button (click)="lgbtnclick()" type="button" name="button"></button>

TypeScript

import { Component, OnInit } from "@angular/core";
@Component({
  selector: "app-about",
  templateUrl: "./about.component.html",
  styleUrls: ["./about.component.scss"]
})
export class AboutComponent implements OnInit {
  name: string;
  constructor() {}

  ngOnInit() {}

  lgbtnclick() {
    alert(this.name);
    console.log(Error);
  }
}

Answer 6

Hey there! The name attribute in your HTML code isn't directly linked to your TypeScript file. It's simply an attribute on the HTMLElement. If you need that value to be accessible, there are several options available. The easiest solution is to assign the name variable to the value attribute of the input element or use ngModel (remember to import ReactiveFormsModule and FormsModule in your AppModule)

Solution Using Value Attribute

HTML

<input type="text" name="username" [value]="name">
<button (click)="lgbtnclick()" type="button" name="button"></button>

TypeScript

import { Component, OnInit } from "@angular/core";
@Component({
  selector: "app-about",
  templateUrl: "./about.component.html",
  styleUrls: ["./about.component.scss"]
})
export class AboutComponent implements OnInit {
  name: string;
  constructor() {}

  ngOnInit() {}

  lgbtnclick() {
    alert(this.name);
    console.log(Error);
  }
}

Solution Using ngModel

HTML

<input type="text" name="username" [(ngModel)]="name">
<button (click)="lgbtnclick()" type="button" name="button"></button>

TypeScript

import { Component, OnInit } from "@angular/core";
@Component({
  selector: "app-about",
  templateUrl: "./about.component.html",
  styleUrls: ["./about.component.scss"]
})
export class AboutComponent implements OnInit {
  name: string;
  constructor() {}

  ngOnInit() {}

  lgbtnclick() {
    alert(this.name);
    console.log(Error);
  }
}

I'm having trouble retrieving the value from the textbox in my Angular 7 project using TypeScript

Answer №1

Answer №2

Answer №3

Solution Using Value Attribute

HTML

TypeScript

Solution Using ngModel

HTML

TypeScript

Similar questions

What is the best way to manage errors and responses before passing them on to the subscriber when using rxjs lastValueFrom with the pipe operator and take(1

Angular routing unit testing: Breaking down routing testing into individual route testing sequences

Managing the state of a flag: communicating between Angular2 header and sidebar components

There was an issue with compiling the template in the module. It was unable to locate the component in relation to the [

Error in Angular 7: params.map function is undefined

Enhancing the visual aesthetics of KendoUI Charts through custom formatting

How to toggle visibility of multiple div elements in ReactJS

Handling generic errors in Angular 2's Http responses

Utilizing Angular's Mat-Table feature to dynamically generate columns and populate data in a horizontal manner

Running "ng lint --fix" does not automatically correct the issues in my files, but it does effectively pinpoint all the errors that need to be addressed

using outlines for FontAwesome icons in React Native

PrimeNG - Sticky header feature malfunctioning in the p-table

The Firebase storage percentChanges() method is throwing a NaN error

Extracting the hour and minute from a timestamp like 11:15 AM can be done using specific methods

Exploring the process of retrieving data from localStorage in Next.js 13

What is the process for sending an HTTP post request with a React/Typescript frontend and a C#/.Net backend?

Encountering a POST 504 error while attempting to proxy an Angular application to a Node server

The combination of Node.js, Express router, and TypeScript is causing an issue where a string argument is not compatible with the request

Adjusting slidesPerView based on screen size in Ionic: A step-by-step guide

Module '.tmp/Rx.min.js' could not be located