How can I position a dialog above the triggering button?

Question

I\'m about to put a fist through my PC screen. I have a dialog box that refuses to budge a hot inch above my submit button at the bottom of the screen -- I want it at the v

Answer 1

A better way to do this is to inject the button element and pass it into the dialog. This way, the dialog has the full context on how to size it up/position it (and leverage the element.getBoundingClientRect() function):

Dialog Component:

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

@Component({
  selector: 'app-dialog-component',
  templateUrl: './dialog.component.html',
  styleUrls: ['./dialog.component.scss']
})
export class MyDialogComponent implements OnInit {
  private readonly _matDialogRef: MatDialogRef;
  private readonly triggerElementRef: ElementRef;
  constructor(_matDialogRef: MatDialogRef,
              @Inject(MAT_DIALOG_DATA) data: { trigger: ElementRef }) {
    this._matDialogRef = _matDialogRef;
    this.triggerElementRef = data.trigger;
  }

  ngOnInit() {
    const matDialogConfig: MatDialogConfig = new MatDialogConfig();
    const rect = this.triggerElementRef.nativeElement.getBoundingClientRect();
    matDialogConfig.position = { left: `${rect.left}px`, top: `${rect.bottom - 50}px` };
    matDialogConfig.width = '300px';
    matDialogConfig.height = '400px';
    this._matDialogRef.updateSize(matDialogConfig.width, matDialogConfig.height);
    this._matDialogRef.updatePosition(matDialogConfig.position);
  }
  cancel(): void {
    this._matDialogRef.close(null);
  }
}

Usage:

onShowDialog(evt: MouseEvent): void {
  const target = new ElementRef(evt.currentTarget);
  const dialogRef = this._matDialog.open(MyDialogComponent, {
    data: { trigger: target }
  });
  dialogRef.afterClosed().subscribe( _res => {
    console.log(_res);
  });
}