Angular material autocomplete doesn't work, doesn't show any errors

Simeon Nakov

I've implemented autocomplete, no errors, everything works fine, but absolutely nothing happens. I typed something into the input field, but nothing seems to happen, nothing shows up in the console.

HTML

  <form>
    <mat-form-field>
      <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto">
    </mat-form-field>

    <mat-autocomplete #auto="matAutocomplete">
      <mat-option *ngFor="let n of testValues" [value]="n">
        {{n}}
      </mat-option>
    </mat-autocomplete>
  </form>

TS

import { MatAutocomplete } from '@angular/material/autocomplete';
import { FormControl } from '@angular/forms';
...
public testValues = ['one', 'two', 'three', 'four'];
public myControl: FormControl;
...
constructor() {
    this.myControl = new FormControl();
}

EDIT: I have imported

import {MatAutocompleteModule} from '@angular/material/autocomplete';

in my app module.

Material Version -

"@angular/material": "^5.0.0-rc.2",
Gianluca Paris

you are missing in your filter method.ts

You have to subscribe myControl valueChangesthis way :

this.myControl.valueChanges.subscribe(newValue=>{
    this.filteredValues = this.filterValues(newValue);
})

So every time your form control value changes, you will call your custom filterValues()method which should be something like:

filterValues(search: string) {
    return this.testValues.filter(value=>
    value.toLowerCase().indexOf(search.toLowerCase()) === 0);
}

So you can use testValuesarray as base array and filteredValuesuse array in html:

<mat-option *ngFor="let n of filteredValues" [value]="n">
    {{n}}
</mat-option>

Filtering is not automatic, you must use a custom method to filter options. hope to help you

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