I have a user input box with autocomplete and I'm adding a button on the
right side so that a user can click and see the drop down list immediately
without having to type something first but I'm not sure why drop down list
is not showing when I click the button for the first time when the browser
is refreshed..
Right now the button only work (show dropdown list) when I type something
first in the input box and clear it.
I'll be really appreciated if I get any help or suggestion on how to make
this work.
HTML
```
<mat-form-field class="form" appearance="fill">
<mat-label>Select or Type out a Super Tag</mat-label>
<mat-chip-list #chipList>
<div>
<mat-chip *ngFor="let superTag of superTags"
[selectable]="selectable" [removable]="removable"
(removed)="remove(superTag)">
<img class="super-icon"
src="/assets/images/icons/super-tag-icon.svg">
{{superTag.tag}}
<mat-icon matChipRemove *ngIf="removable"
matTooltip="Remove a super tag">cancel</mat-icon>
</mat-chip>
</div>
<div>
<input matInput #input [(ngModel)]="tagIn"
[formControl]="tagCtrl" [matAutocomplete]="auto"
[matChipInputFor]="chipList"
[matChipInputSeparatorKeyCodes]="separatorKeysCodes"
(matChipInputTokenEnd)="addTag()">
</div>
</mat-chip-list>
<mat-autocomplete #auto="matAutocomplete"
(optionSelected)="selected($event)" autoActiveFirstOption>
<mat-option *ngIf="isLoading" class="is-Loading">
<mat-spinner diameter="20"></mat-spinner>
</mat-option>
<ng-container *ngIf="!isLoading">
<mat-option *ngFor="let tag of filteredSuperTags | async"
[value]="tag">
{{tag}}
</mat-option>
</ng-container>
</mat-autocomplete>
<button mat-icon-button
matSuffix
(click)="openPanel($event)"
color="primary">
<mat-icon aria-label="Add New State">arrow_drop_down</mat-icon>
</button>
</mat-form-field>
```
TS
````
import { MatAutocompleteTrigger } from '@angular/material/autocomplete';
@ViewChild(MatAutocompleteTrigger, {read: MatAutocompleteTrigger})
inputAutoComplit: MatAutocompleteTrigger;
@ViewChild('autoTrigger', { read: MatAutocompleteTrigger })
autoTrigger: MatAutocompleteTrigger;
openPanel(evt): void {
evt.stopPropagation();
this.inputAutoComplit.openPanel();
}
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