A guide on extracting and transferring data from one field to another within Angular 2

Question

A guide on extracting and transferring data from one field to another within Angular 2

In my form, I have two input fields. My goal is to take the text from the first field, replace the first part with different text, and dynamically populate it into the second field. While I have managed to retrieve the value from the first field easily, I am struggling to figure out how to replace and snip the text on keyup. Below is the code snippet: Component HTML

<div class="labels">Real Name</div> 
<div class="lbl">
     <input #realName type="text" [(ngModel)]="actualName" (keyup)="trigger()">
 </div>
 <div class="labels">Cyber Name</div>
 <div class="lbl">
     <input #cybName type="text"[(ngModel)]="cyberName"> 
  </div>

Component TS

@ViewChild('realName') realName: ElementRef;
@ViewChild('cybName') cybName: ElementRef;

trigger() {
  this.cybName.nativeElement.value = this.realName.nativeElement.value;
}

Currently, I am simply setting the cyber name to be the same as the real name on every keyup event. However, I actually want to snip the first 4 characters of the real name and replace them with "droid", while keeping the rest of the characters intact. For example, if the real name entered is "Alexys", the desired output should be "droidys".

I understand that handling this on keyup might not be the best approach. I would appreciate any suggestions or assistance in implementing this functionality. Thank you.

javascript angular typescript

Answer 1

Answer №1

If you're looking for a simple fix to your problem, consider this solution:

Modifications in html:

<input #realName type="text" [ngModel]="actualName" (ngModelChange)="trigger($event)">

Modifications in typescript:

trigger(newActualName) {
  this.actualName = newActualName;
  this.cyberName = `Droid${event.substring(4)}`;
}

By updating the model (actualName and cyberName), the input will automatically reflect these changes with the updated values.

Note: It is advised by Angular to avoid using ElementRef and directly manipulating the DOM. For more information, visit here.

Answer 2

If you're looking for a simple fix to your problem, consider this solution:

Modifications in html:

<input #realName type="text" [ngModel]="actualName" (ngModelChange)="trigger($event)">

Modifications in typescript:

trigger(newActualName) {
  this.actualName = newActualName;
  this.cyberName = `Droid${event.substring(4)}`;
}

By updating the model (actualName and cyberName), the input will automatically reflect these changes with the updated values.

Note: It is advised by Angular to avoid using ElementRef and directly manipulating the DOM. For more information, visit here.

Answer 3

Answer №2

To manipulate your input, you can utilize the splice method for cutting it up. Below are some assumed use cases:

"AAAAAA" -> "droidAA"

"AAAA" -> "droid"

"AA" -> "AA"

const strLength = this.realName.nativeElement.value && this.realName.nativeElement.value.toString().length;

if (strLength >= 4) {
    this.cybName.nativeElement.value = 'droid' + this.realName.nativeElement.value.toString().splice(4, strLength);
} else {
    this.cybName.nativeElement.value = this.realName.nativeElement.value;
}

Additionally, strive to avoid using nativeElement unnecessarily. Instead, work directly with the variables themselves.

if (this.actualName && this.acutualName.length >= 4) {
    this.cyberName = 'droid' + this.actualName.splice(4, this.acutualName.length);
} else {
    this.cyberName = this.actualName;
}

Answer 4

To manipulate your input, you can utilize the splice method for cutting it up. Below are some assumed use cases:

"AAAAAA" -> "droidAA"

"AAAA" -> "droid"

"AA" -> "AA"

const strLength = this.realName.nativeElement.value && this.realName.nativeElement.value.toString().length;

if (strLength >= 4) {
    this.cybName.nativeElement.value = 'droid' + this.realName.nativeElement.value.toString().splice(4, strLength);
} else {
    this.cybName.nativeElement.value = this.realName.nativeElement.value;
}

Additionally, strive to avoid using nativeElement unnecessarily. Instead, work directly with the variables themselves.

if (this.actualName && this.acutualName.length >= 4) {
    this.cyberName = 'droid' + this.actualName.splice(4, this.acutualName.length);
} else {
    this.cyberName = this.actualName;
}

Answer 5

Answer №3

It seems like your intention is to concatenate the substr:

let digitalAlias = 'byte';
let humanName = 'Samantha';
let digitalHumanAlias = `${digitalAlias}${humanName.substring(4)}`;
console.log(digitalHumanAlias);

Answer 6

It seems like your intention is to concatenate the substr:

let digitalAlias = 'byte';
let humanName = 'Samantha';
let digitalHumanAlias = `${digitalAlias}${humanName.substring(4)}`;
console.log(digitalHumanAlias);

Answer 7

Answer №4

Here are some steps to try:

<div class="header">Full Name</div> 
<div class="input-field">
     <input #fullName type="text" [(ngModel)]="completeName">
 </div>
 <div class="header">Online Alias</div>
 <div class="input-field">
     <input #alias type="text"[ngModel]="'online' + completeName.substring(6)"> 
  </div>

Answer 8

Here are some steps to try:

<div class="header">Full Name</div> 
<div class="input-field">
     <input #fullName type="text" [(ngModel)]="completeName">
 </div>
 <div class="header">Online Alias</div>
 <div class="input-field">
     <input #alias type="text"[ngModel]="'online' + completeName.substring(6)"> 
  </div>

Answer 9

Answer №5

There are numerous approaches to tackle this problem, as evident from the various responses. Personally, I would opt for utilizing a pipe to accomplish this task. This concept is demonstrated in a functional example available at this link.

To create a custom pipe, follow these steps:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({name: 'robotNamePipe'})
export class RobotNamePipe implements PipeTransform {
  transform(value: number, exponent: string): string {

  // Insert your logic here

    return `${value} - Anything you desire!`;
  }
}

... and then use it in your HTML like so:

<div class="labels">Real Name</div> 
<div class="lbl">
     <input #realName type="text" [(ngModel)]="actualName">
 </div>
 <div class="labels">Cyber Name</div>

<p>Robot name: {{realName.value | robotNamePipe}}</p>

In truth, allowing users to modify the generated droid name might not be ideal - don't you agree?

Answer 10

There are numerous approaches to tackle this problem, as evident from the various responses. Personally, I would opt for utilizing a pipe to accomplish this task. This concept is demonstrated in a functional example available at this link.

To create a custom pipe, follow these steps:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({name: 'robotNamePipe'})
export class RobotNamePipe implements PipeTransform {
  transform(value: number, exponent: string): string {

  // Insert your logic here

    return `${value} - Anything you desire!`;
  }
}

... and then use it in your HTML like so:

<div class="labels">Real Name</div> 
<div class="lbl">
     <input #realName type="text" [(ngModel)]="actualName">
 </div>
 <div class="labels">Cyber Name</div>

<p>Robot name: {{realName.value | robotNamePipe}}</p>

In truth, allowing users to modify the generated droid name might not be ideal - don't you agree?

A guide on extracting and transferring data from one field to another within Angular 2

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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