Prevent closing of modal dialog in Angular Dialog component

27 Sep 20239 minutes to read

You can prevent closing of modal dialog by setting the beforeClose event argument cancel value to true.
In the following sample, the dialog is closed when you enter the username value with minimum 4 characters. Otherwise, it will not be closed.

app.component.ts

import { Component, ViewChild, OnInit, ElementRef } from '@angular/core';
import { DialogComponent } from '@syncfusion/ej2-angular-popups';
import { EmitType } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: `
    <button class="e-control e-btn" style="position: absolute;" id="targetButton" (click)="onOpenDialog($event)">Open Dialog</button>
    <div #container class='root-container'>
      <ejs-dialog id='dialog' #ejDialog isModal='true' header='Sign in' (beforeClose)="validation($event)"[buttons]='buttons' [target]='targetElement' width='300px'>
        <ng-template #content>
        <div className="login-form">
          <div class="wrap">
              <div class="e-float-input e-input-group">
                <input id="textvalue" type="text" required (focus)="focusIn($event.target)" (blur)="focusOut($event.target)"/>
                <span class="e-float-line"></span>
                <label class="e-float-text">Username</label>
              </div>
              <div class="e-float-input e-input-group">
                <input id="textvalue2" type="password" required (focus)="focusIn($event.target)" (blur)="focusOut($event.target)"/>
                <span class="e-float-line"></span>
                <label class="e-float-text">Password</label>
              </div>
          </div>
        </div>
        </ng-template>
      </ejs-dialog>
    </div> `
})

export class AppComponent {
    @ViewChild('ejDialog') ejDialog: DialogComponent | undefined;
   // The Dialog shows within the target element.
    @ViewChild('container', { read: ElementRef }) container: ElementRef | undefined;
    // The Dialog shows within the target element.
    public targetElement?: HTMLElement;

    //To get all element of the dialog component after component get initialized.
    ngOnInit() {
      this.initilaizeTarget();
    }

    public focusIn(target: HTMLElement |any): void {
        let parent: HTMLElement = target.parentElement as HTMLElement;
        if (parent.classList.contains('e-input-in-wrap')) {
            parent.parentElement!.classList.add('e-input-focus');
        } else {
            parent.classList.add('e-input-focus');
        }
    }

    public focusOut(target: HTMLElement| any): void {
        let parent: HTMLElement = target.parentElement as HTMLElement;
        if (parent.classList.contains('e-input-in-wrap')) {
            parent.parentElement!.classList.remove('e-input-focus');
        } else {
            parent.classList.remove('e-input-focus');
        }
    }
    // Hide the Dialog when click the footer button.
    public hideDialog: EmitType<object> = () => {
        this.ejDialog!.hide();
    }
    // Enables the footer buttons
    public buttons: Object = [
        {
            'click': this.hideDialog.bind(this),
            // Accessing button component properties by buttonModel property
              buttonModel:{
              content:'Log in',
              //Enables the primary button
              isPrimary: true
            }
        }
    ];

    // Initialize the Dialog component target element.
    public initilaizeTarget: EmitType<object> = () => {
      this.targetElement = this.container!.nativeElement.parentElement;
    }
    public validation (event: any): void {
        let text = document.getElementById('textvalue');
        let text1 = document.getElementById('textvalue2');
        if ((text as any).value === "" && (text1 as any).value === "") {
            event.cancel= true;
            alert("Enter the username and password")
        } else if ((text as any).value === "") {
            event.cancel= true;
            alert("Enter the username")
        } else if ((text1 as any).value === "") {
            event.cancel= true;
            alert("Enter the password")
        } else if ((text as any).value.length < 4) {
            event.cancel= true;
            alert("Username must be minimum 4 characters")
        } else {
            event.cancel= false;
            (document.getElementById("textvalue")! as any).value = "";
            (document.getElementById("textvalue2")! as any).value = "";
        }
    }
    // Sample level code to handle the button click action
    public onOpenDialog = (event: any): void => {
        // Call the show method to open the Dialog
        this.ejDialog!.show();
    }
}

app.module.ts

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

main.ts

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

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);