Validation in Angular TextBox component

24 May 2022 / 1 minute to read

The TextBox supports three types of validation styles namely error, warning, and success. These states are enabled by adding corresponding classes .e-error, .e-warning, or .e-success to the input parent element.

Source

Preview

app.component.ts

app.module.ts

main.ts

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

@Component({
    selector: 'app-root',
    template: `<div class="wrap">
                <input class="e-input e-warning" type="text" placeholder="Input with warning"/>
                <div class="e-input-group e-error">
                    <input class="e-input" type="text" (focus)="focusIn($event.target)"
                    placeholder = "Input with error" (blur)="focusOut($event.target)"/>
                </div>
                <div class="e-input-group e-success">
                    <input class="e-input" type="text" (focus)="focusIn($event.target)"
                    placeholder = "Input with success" (blur)="focusOut($event.target)"/>
                </div>
               </div>`
})

export class AppComponent {
    public focusIn(target: HTMLElement): void {
        target.parentElement.classList.add('e-input-focus');
    }

    public focusOut(target: HTMLElement): void {
        target.parentElement.classList.remove('e-input-focus');
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { FormsModule } from '@angular/forms';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        FormsModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Adding mandatory asterisk to placeholder and float label

You can add a mandatory asterisk(*) to placeholder and float label using .e-float-input.e-control-wrapper .e-float-text::after class.

Source

Preview

app.component.ts

app.module.ts

main.ts

asterisk.css

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

@Component({
    selector: 'app-root',
    template: `<div class="wrap">
    <h4>Floating label as auto</h4>
    <div class='textboxes'>
      <ejs-textbox placeholder="First Name" floatLabelType="Auto"></ejs-textbox>
    </div>

    <h4>Floating label as always</h4>
    <div class='textboxes'>
      <ejs-textbox placeholder="First Name" floatLabelType="Always"></ejs-textbox>
    </div>
  </div>`
})

export class AppComponent { }

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import {TextBoxModule} from '@syncfusion/ej2-angular-inputs';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        TextBoxModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

#container {
    visibility: hidden;
}

#loader {
    color: #008cff;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}

.wrap {
    box-sizing: border-box;
    margin: 0 auto;
    padding: 20px 10px;
    width: 260px;
}

.textboxes {
    margin-top: 15px;
}

.e-float-input.e-control-wrapper .e-float-text::after {
    content: '*';
    color: red;
}