Angular Material: mat-select not selecting default

I have a mat-select where the options are all objects defined in an array. I am trying to set the value to default to one of the options, however it is being left selected when the page renders.

My typescript file contains:

  public options2 = [
    {"id": 1, "name": "a"},
    {"id": 2, "name": "b"}
  ]
  public selected2 = this.options2[1].id;

My HTML file contains:

  <div>
    <mat-select
        [(value)]="selected2">
      <mat-option
          *ngFor="let option of options2"
          value="{{ option.id }}">
        {{ option.name }}
      </mat-option>
    </mat-select>
  </div>

I have tried setting selected2 and the value in mat-option to both the object and it's id, and have tried using both [(value)] and [(ngModel)] in the mat-select, but none are working.

I am using material version 2.0.0-beta.10

Use a binding for the value in your template.

value="{{ option.id }}"

should be

[value]="option.id"

And in your selected value use ngModel instead of value.

<mat-select [(value)]="selected2">

should be

<mat-select [(ngModel)]="selected2">

Complete code:

<div>
  <mat-select [(ngModel)]="selected2">
    <mat-option *ngFor="let option of options2" [value]="option.id">{{ option.name }}</mat-option>
  </mat-select>
</div>

On a side note as of version 2.0.0-beta.12 the material select now accepts a mat-form-field element as the parent element so it is consistent with the other material input controls. Replace the div element with mat-form-field element after you upgrade.

<mat-form-field>
  <mat-select [(ngModel)]="selected2">
    <mat-option *ngFor="let option of options2" [value]="option.id">{{ option.name }}</mat-option>
  </mat-select>
</mat-form-field>

Use compareWith, A function to compare the option values with the selected values. see here: https://material.angular.io/components/select/api#MatSelect

For an object of the following structure:

listOfObjs = [{ name: 'john', id: '1'}, { name: 'jimmy', id: '2'},...]

Define markup like this:

<mat-form-field>
  <mat-select
    [compareWith]="compareObjects"
    [(ngModel)]="obj">
       <mat-option  *ngFor="let obj of listOfObjs" [value]="obj">
          {{ obj.name }}
       </mat-option>
    </mat-select>
</mat-form-field>

And define comparison function like this:

compareObjects(o1: any, o2: any): boolean {
  return o1.name === o2.name && o1.id === o2.id;
}

I'm using Angular 5 and reactive forms with mat-select and couldn't get either of the above solutions to display the initial value.

I had to add [compareWith] to deal with the different types being used within the mat-select component. Internally, it appears mat-select uses an array to hold the selected value. This is likely to allow the same code to work with multiple selections if that mode is turned on.

Angular Select Control Doc

Here's my solution:

Form Builder to initialize the form control:

this.formGroup = this.fb.group({
    country: new FormControl([ this.myRecord.country.id ] ),
    ...
});

Then implement the compareWith function on your component:

compareIds(id1: any, id2: any): boolean {
    const a1 = determineId(id1);
    const a2 = determineId(id2);
    return a1 === a2;
}

Next create and export the determineId function (I had to create a standalone function so mat-select could use it):

export function determineId(id: any): string {
    if (id.constructor.name === 'array' && id.length > 0) {
       return '' + id[0];
    }
    return '' + id;
}

Finally add the compareWith attribute to your mat-select:

<mat-form-field hintLabel="select one">
<mat-select placeholder="Country" formControlName="country" 
    [compareWith]="compareIds">

    <mat-option>None</mat-option>
    <mat-option *ngFor="let country of countries" [value]="country.id">
                        {{ country.name }}
    </mat-option>
</mat-select>
</mat-form-field>

You should be binding it as [value] in the mat-option as below,

<mat-select placeholder="Panel color" [(value)]="selected2">
  <mat-option *ngFor="let option of options2" [value]="option.id">
    {{ option.name }}
  </mat-option>
</mat-select>

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