Web Components Mask Input Overview

The Ignite UI for Web Components Mask Input is an input field that allows the developer to control user input and format the visible value, based on configurable rules. It provides different input options and ease in use and configuration.

Web Components Mask Input Example

Usage

First, you need to install the Ignite UI for Web Components by running the following command:

npm install igniteui-webcomponents

Before using the MaskInput, you need to register it as follows:

import { defineComponents, IgcMaskInputComponent } from 'igniteui-webcomponents';
import 'igniteui-webcomponents/themes/light/bootstrap.css';

defineComponents(IgcMaskInputComponent);

For a complete introduction to the Ignite UI for Web Components, read the Getting Started topic.

Mask Rules

The table bellow shows the supported built-in mask rules:

These flags also participate in the component validation - i.e., the input becomes invalid if some but not all required positions are filled (no positions filled/empty value is still a responsibility of required). This applies to both stand-alone inputs and when included in a form.

Applying Mask

Applying the mask is pretty straightforward. All you need to do is provide a predetermined pattern to the Mask property of the input.

In the example below, we will apply a mask for a phone number with an extension code.

<igc-mask-input id="mask-input" mask="(####) 00-00-00 Ext. 9999">
    <igc-icon name="phone" slot="prefix"></igc-icon>
    <span slot="helper-text">Phone number</span>
</igc-mask-input>

After that you should see the following in your browser:

Prompt Character

Developers can customize the prompt symbol used for unfilled parts of the mask. To do this, simply provide any character to the Prompt property:

<igc-mask-input id="mask-input" mask="(####) 00-00-00 Ext. 9999" prompt="-"></igc-mask-input>

By default, the prompt character is underscore.

Placeholder

Developers can also take advantage of the Placeholder property, which serves the purpose of the native input placeholder attribute. If no value is provided for the placeholder, the value of the mask is used as such.

<igc-mask-input id="mask-input" mask="00/00/0000" placeholder="dd/MM/yyyy"></igc-mask-input>

Value Modes

The MaskInput exposes a ValueMode property that lets you choose between raw and withFormatting options to configure which input value (formatted or raw) to bind in your form when a specific mask is applied. By default, ValueMode is set to raw. Try it for yourself in the example below:

Styling

The MaskInput component exposes CSS parts for almost all of its inner elements. The following table lists all of the exposed CSS parts:

igc-mask-input::part(input) {
  background-color: var(--ig-primary-100);
  border-color: var(--ig-secondary-500);
  box-shadow: none;
}

igc-mask-input::part(input)::placeholder {
  color: var(--ig-primary-100-contrast);
}

Assumptions and limitations

• The masked input does not expose a type attribute since it is always an input of type text.
• Undo/redo behavior is currently unsupported.

API References

Additional Resources

• Ignite UI for Web Components Forums
• Ignite UI for Web Components GitHub