Blazor Mask Input Overview

    The Ignite UI for Blazor 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.

    Blazor Mask Input Example

    Usage

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

    // in Program.cs file

builder.Services.AddIgniteUIBlazor(typeof(IgbMaskInputModule));

    You will also need to link an additional CSS file to apply the styling to the IgbMaskInput component. The following needs to be placed in the wwwroot/index.html file in a Blazor Web Assembly project or the Pages/_Host.cshtml file in a Blazor Server project:

    <link href="_content/IgniteUI.Blazor/themes/light/bootstrap.css" rel="stylesheet" />

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

    Mask Rules

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

    Mask Character Description
    0 Digit character [0-9]. Entry is required.
    9 Digit character [0-9]. Entry is optional.
    # Digit character [0-9], plus (+), or minus (-) sign. Entry is required.
    L Letter character. Entry is required.
    ? Letter character. Entry is optional.
    A Alphanumeric (letter or digit) character. Entry is required.
    a Alphanumeric (letter or digit) character. Entry is optional.
    & Any keyboard character. Entry is required.
    C Any keyboard character. Entry is optional.
    \ Escapes a mask flag and turns it into a literal.

    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.

    <IgbMaskInput @ref="MaskInputRef" Mask="(####) 00-00-00 Ext. 9999">
    <IgbIcon IconName="phone" Collection="material" slot="prefix"></IgbIcon>
    <span slot="helper-text">Phone number</span>
</IgbMaskInput>

    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:

    <IgbMaskInput @ref="MaskInputRef" Mask="(####) 00-00-00 Ext. 9999" Prompt="-"></IgbMaskInput>

    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.

    <IgbMaskInput @ref="MaskInputRef" Mask="00/00/0000" Placeholder="dd/MM/yyyy"></IgbMaskInput>

    Value Modes

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

    Name Description
    container The main wrapper that holds all main input elements.
    input The native input element.
    label The native label element.
    prefix The prefix wrapper.
    suffix The suffix wrapper.
    helper-text The helper text wrapper. 
    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