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Angular Material (MAT) Form-Field

Introduction

The <mat-form-field> is a component that is used to wrap multiple MAT components and implement common text field styles of the form-field such as hint message, underlines, and floating label.

These five MAT components are designed to work inside the form-field:

  1. <mat-chip-list>
  2. <input matNativeControl>
  3. <textarea matNativeControl>
  4. <mat-select>
  5. <select matNativeControl>

API reference for Angular Material form-field

Example 1: Simple Form


Angular Material (MAT) Form-Field

Form field appearance variants

The <mat-form-field> supports four different appearance forms that can be set through appearance input.

S. No Appearance variant names Description
1. Legacy appearance It is the default style of the mat-form-field that is used to display the input-box with an underline.
2. Standard appearance It is a new version of the legacy appearance. It is more consistent with the fill and outline appearances.
3. Fill appearance In addition to the underline, it shows the <mat-form-field> with a filled background box.
4. Outline appearance It shows the <mat-form--field> with a border all the way around, not just an underline.

Example 2: Form-field appearance variants


Angular Material (MAT) Form-Field

Hint labels

Hint labels are additional descriptive-text that appears below the underline of the <mat-form-field>. It contains two hint labels: first start-aligned and the other end-aligned.

Hint labels are specified in two ways.

  1. By using the hintLabel property of the <mat-form-field>.
  2. By adding the <mat-hint> module in the form field.

When multiple hints are added to the same page, the probability of error on that page increases.

Example 3: Form field with hints


Angular Material (MAT) Form-Field

Error messages

The error message can be shown under the form field by adding the <mat-error> module. The errors are initially hidden that is displayed on the invalid entry after the user interacts with the element, or the original form is submitted.

If the form field can contain more than one error condition, it is up to the consumer to display which messages first. It can be done with ngSwitch, ngIf, or CSS. If required, multiple error messages may be displayed at the same time, but <mat-form-field> only has enough space to display one error message at a time.

Example 4: Error message form


Angular Material (MAT) Form-Field

Theming and Font-Size

The <mat-form-field> has a color-palette that can be set the color of the form fields. It sets the color of the form field based on your application's theme colors.

The <mat-form-field> derives its font-size from its parent element. It can be overridden in a clear shape using CSS.

Example 5: Form field theming and font-size

HTML Code

CSS Code:


Angular Material (MAT) Form-Field

Prefix & suffix

The input of the text field can be included before and after the input tag, as a suffix or prefix. The text field view will be included within the container that wraps the form control according to the content specification.

If you want to add a text-prefix element to the text field, you must use the matPrefix directive inside the <mat-form-field>. Similarly, if you want to add a text-suffix element to the text field, you must use the matSuffix directive inside the <mat-form-field>.

Example 6: Prefix & Suffix form field


Angular Material (MAT) Form-Field
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