Angular Material - matIcon in MatSelect

I use this angular material select in my Angular 5 application:

<mat-form-field> <mat-select placeholder="Contact *" formControlName="contact"> <mat-option *ngFor="let contact of contacts" [value]="contact"> <mat-icon [ngStyle]="{'color': contact.color}">home</mat-icon>{{contact.institution}} </mat-option> </mat-select> </mat-form-field> 

On the select panel <mat-icon> are listed as expected but if I select one option then the home icon does not appear in <mat-form-field>

How could I also view the home icon in <mat-form-field> once selected?

4 Answers

This can be accomplished via the "mat-select-trigger" option. Documentation on the "mat-select" can be found here.

Below should be a working example of what you are trying to do. Based on what you provided.

<mat-form-field> <mat-select placeholder="Contact *" formControlName="contact"> <mat-select-trigger> <mat-icon>home</mat-icon>&nbsp;{{ contact.institution }} </mat-select-trigger> <mat-option *ngFor="let contact of contacts" [value]="contact"> <mat-icon [ngStyle]="{ color: contact.color }">home</mat-icon>{{ contact.institution }} </mat-option> </mat-select> </mat-form-field> 

And apply styles as necessary.

You can add a matPrefix to the form field:

<mat-form-field> <span matPrefix><mat-icon>home</mat-icon></span> <mat-select placeholder="Contact *" formControlName="contact"> <mat-option *ngFor="let contact of contacts" [value]="contact"> <mat-icon [ngStyle]="{'color': contact.color}">home</mat-icon>{{contact.institution}} </mat-option> </mat-select> </mat-form-field> 

If the icon is a property of each contact such as contact.icon then you will need to do a bit more work to bind the currently selected contact's icon property to the mat-icon name:

<mat-form-field> <span *ngIf="select.value" matPrefix><mat-icon>{{select.value.icon}}</mat-icon></span> <mat-select #select placeholder="Contact *" formControlName="contact"> <mat-option *ngFor="let contact of contacts" [value]="contact"> <mat-icon [ngStyle]="{'color': contact.color}">home</mat-icon>{{contact.institution}} </mat-option> </mat-select> </mat-form-field> 

I had the same issue, and I fixed by subscribing to the contact field of the reactive form, and then update the value of your object here is how.

My Template

<mat-form-field appearance="fill"> <mat-label>Avatar</mat-label> <mat-select formControlName="avatar"> <mat-select-trigger> <mat-icon svgIcon="{{user.avatar}}"></mat-icon> {{user.avatar}} </mat-select-trigger> <mat-option *ngFor="let avatar of avatars" [value]="avatar"> <mat-icon svgIcon="{{avatar}}"></mat-icon>{{avatar}} </mat-option> </mat-select> </mat-form-field> 

My TS Code

this.contactForm.get('avatar').valueChanges.subscribe((value) => { this.user.avatar = value; }); 

and as you noticed I'm here updating the user object with the selected value, then

<mat-icon svgIcon="{{user.avatar}}"></mat-icon> 

will be updated by the selected avatar.

You can add conditions inside mat-select-trigger using :

 <mat-select matInput formControlName="status" placeholder="select status" required> <mat-select-trigger> <ng-container [ngTemplateOutlet]="icons" [ngTemplateOutletContext]="{data:formControls.status.value}"></ng-container> </mat-select-trigger> <mat-option *ngFor="let currStatus of data.status" [value]="currStatus "> <ng-container [ngTemplateOutlet]="icons" [ngTemplateOutletContext]="{data: currStatus}"></ng-container> </mat-option> </mat-select> 

to avoide duplicate code you can set the mat-icon section in template

 <ng-template #icons let-data="data"> <mat-icon *ngIf="data.key === taskStatus.WAITING">hourglass_empty</mat-icon> <mat-icon *ngIf="data.key === taskStatus.IN_PROGRESS">autorenew</mat-icon> <mat-icon *ngIf="data.key === taskStatus.COMPLETED">done</mat-icon> {{data.value}} </ng-template> 

in ts file:

 public get formControls() { return this.createTaskForm.controls; }