Position the dialog on center of the page on scrolling in Angular Dialog component

27 Sep 20235 minutes to read

By default, when scroll the page/container Dialog also scrolled along with the page/container.
When a user expects to display the Dialog in the same position without scrolling achieving this in sample level as like below. Here added ‘e-fixed’ class to Dialog element and prevent the scrolling.

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: ` <div #container class='root-container'></div>
            <div>
            <b>JavaScript:</b><br />
            JavaScript is a high-level, dynamic, untyped, and interpreted programming language. It has been standardized in the ECMAScript
            language specification. Alongside HTML and CSS, it is one of the three essential technologies of World Wide Web
            content production; the majority of websites employ it and it is supported by all modern Web browsers without
            plug-ins. JavaScript is prototype-based with first-class functions, making it a multi-paradigm language, supporting
            object - oriented , imperative, and functional programming styles.
            <br /><br /><br />
            <b>MVC:</b><br />
            Model–view–controller (MVC) is a software architecture pattern which separates the representation of information from the user's interaction with it. The model consists of application data, business rules, logic, and functions. A view can be any output representation of data, such as a chart or a diagram. Multiple views of the same data are possible, such as a bar chart for management and a tabular view for accountants. The controller mediates input, converting it to commands for the model or view.The central ideas behind MVC are code reusability and in addition to dividing the application into three kinds of components, the MVC design defines the interactions between them.
            A controller can send commands to its associated view to change the view's presentation of the model (e.g., by scrolling through a document). It can also send commands to the model to update the model's state (e.g., editing a document).
            A model notifies its associated views and controllers when there has been a change in its state. This notification allows the views to produce updated output, and the controllers to change the available set of commands. A passive implementation of MVC omits these notifications, because the application does not require them or the software platform does not support them.
            A view requests from the model the information that it needs to generate an output representation to the user.
        </div>

      <ejs-dialog id='dialog' #ejDialog header='Dialog' showOnInit='true' [target]='targetElement' width='250px' [closeOnEscape]='closeOnEscape'>
      <div style='padding:18px;padding-top:0px;'>
      <button class="e-control e-btn" id="targetButton" role="button" (click)="onPreventScroll($event)">Prevent Dialog Scroll</button>
      </div>
      </ejs-dialog>
        `
})

export class AppComponent implements OnInit {
    @ViewChild('ejDialog') ejDialog: DialogComponent | any;
    // Create element reference for dialog target element.
    @ViewChild('container', { read: ElementRef }) container: ElementRef | any;
    // 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();
    }

    // Initialize the Dialog component target element.
    public initilaizeTarget: EmitType<object> = () => {
      this.targetElement = this.container.nativeElement.parentElement;
    }
    // Disable the Esc key option to hide the Dialog
    public closeOnEscape: boolean =false;
    // Add e-fixed class to Dialog element
    public onPreventScroll = (event: any): void => {
        this.ejDialog.cssClass='e-fixed';
    }
    // Dialog content
    public content:string='<button class="e-control e-btn" id="targetButton" role="button">Prevent Dialog Scroll</button>';

}

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);