Tips for centering an Angular mat prefix next to a label in a form field

Hey everyone, I need some help with aligning the prefix for an input with the mat label. Can anyone suggest a way to adjust the mat prefix so that it lines up perfectly with the mat label? Any assistance or ideas would be greatly appreciated.

Here is the desired outcome:

View image of expected alignment here

#html code

 <mat-form-field appearance="fill">
            <mat-label>Termination Payment ($)</mat-label>
            <input 
              name="terminationPayment" 
              matInput
              (keyup) = "computeBuyout()"
              mask="separator.0" 
              thousandSeparator=","
              [allowNegativeNumbers]="false"
              [(ngModel)]="dealDispositionFormFields.terminationPayment"
              >
              <span matPrefix *ngIf="dealDispositionFormFields.terminationPayment">$</span>
          </mat-form-field>

See screenshot of current issue here

angulartypescriptangular-material

Answer №1

We will need to make some adjustments to the default label wrapper class in order to align it properly and ensure visibility. Since the label wrapper class is deeply nested, we must use ::ng-deep to override its styles. It's important to be cautious with this approach as it can have unintended consequences on other components.

To begin, shift the label to the left by the size of the icon. The default size of the mat-form-field-prefix (class used for icons) is 12.953px. By shifting the form label left by this value, it should align perfectly with the prefix icon.

Next, make sure that the shifted text remains visible. The default setting of mat-form-field-label-wrapper includes an overflow property set to hidden, which we'll need to change to visible.

When combined, the custom styling class should look like this:

::ng-deep .mat-form-field-label-wrapper {
  overflow: visible;
  margin-left: -12.953px;
}

This solution has been tested using the example documentation here. The final result should resemble this image:

https://i.stack.imgur.com/TFVI7.png

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