Angular material dialog component hides all my website components

Question

I'm using angular 5 and angular material (latest version) and I'm trying to open a dialog from a page. When I click the button that triggers the opening, the entire website is put in blank background like if the dialog were overlaping it contents and hiding it all.

import { Component, OnInit, Inject } from '@angular/core';
import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material';

@Component({
    moduleId: module.id,
    selector: 'app-dialog',
    templateUrl: 'dialog.component.html',
    styleUrls: ['dialog.component.scss']
})
export class DialogComponent implements OnInit {

    constructor(public dialogRef: MatDialogRef<DialogComponent>,
        @Inject(MAT_DIALOG_DATA) public data: any) { }

    onNoClick(): void {
        this.dialogRef.close();
    }

    ngOnInit() {
    }

}

And this is the method that opens the Dialog.

onSubmit() {

        const dialogRef = this.dialog.open(DialogComponent, {
            width: '250px',
            data: { name: 'Juan Manuel', animal: 'Perro' }
        });

        dialogRef.afterClosed().subscribe(result => {
            console.log('The dialog was closed');
            console.log(result);
        });
    }

UPDATE: I've seen that after the dialog is rendered a class is added to my html tag. .cdk-global-scrollblock I don't know why is that class added to my html tag.

.cdk-global-scrollblock {
    position: fixed;
    width: 100%;
    overflow-y: scroll;
}

That what's causing my error. Does someone knows why is that class on my html tag?

Answer 1

Easiest fix would be setting the dialog scroll strategy to new NoopScrollStrategy object:

const dialogRef = this.dialog.open(DialogComponent, {
        width: '250px',
        data: { name: 'Juan Manuel', animal: 'Perro' },
        scrollStrategy: new NoopScrollStrategy()
    });

this will only require an extra import:

import { NoopScrollStrategy } from '@angular/cdk/overlay';