Blazor Checkbox Overview

    The Blazor Checkbox is a component that lets you add checkboxes to your Blazor apps. It behaves as a standard HTML checkbox, enabling users to select basic checked and unchecked states or an additional indeterminate state. You also get full control over the styling of the Blazor checkbox component and ability to use it with forms.

    Checkbox Example

    Usage

    At its core, the IgbCheckbox allows for a choice between selected/unselected state. The default styling is done according to the selection controls specification in the Material Design guidelines.

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

    // in Program.cs file

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

    You will also need to link an additional CSS file to apply the styling to the IgbCheckbox 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" />

    The simplest way to start using the IgbCheckbox is as follows:

    <IgbCheckbox />

    [!WARNING] The IgbCheckbox component doesn't work with the standard <form> element. Use Form instead.

    Examples

    Label

    To provide a meaningful label for the checkbox, simply place some text between the opening and closing tags:

    <IgbCheckbox>Label</IgbCheckbox>

    You can specify if the label should be positioned before or after the checkbox toggle by setting the label-position attribute of the checkbox. Allowed values are before and after (default):

    <IgbCheckbox LabelPosition="@CheckboxBaseLabelPosition.Before">Label</IgbCheckbox>

    The checkbox can also be labelled by elements external to the checkbox. In this case, the user is given full control to position and style the label in accordance with their needs.

    <span id="checkbox-label">Label</span>
<IgbCheckbox AriaLabelledby="checkbox-label" />

    Checked

    You can use the Checked attribute of the component to determine whether the checkbox should be toggled on or off by default.

    <IgbCheckbox Checked="true" />

    Indeterminate

    You can use the Indeterminate property of the component to set the checkbox's value to neither true nor false.

    <IgbCheckbox Indeterminate="true" />

    Required

    You can use the Required property to mark the checkbox as required.

    <IgbCheckbox Required="true" />

    Invalid

    You can use the Invalid attribute to mark the checkbox as invalid.

    <IgbCheckbox Invalid="true" />

    Disabled

    You can use the Disabled attribute to disable the checkbox.

    <IgbCheckbox Disabled="true" />

    Forms

    You can use the name and value attributes when using the checkbox with Form.

    <IgbCheckbox Name="wifi" Value="enabled" />

    Styling

    The IgbCheckbox component exposes four CSS parts which we can use for styling:

    Name Description
    base The base wrapper of the checkbox.
    control The checkbox input element.
    indicator The checkbox indicator icon.
    label The checkbox label.

    With this four CSS parts we have full control over the Checkbox styling.

    igc-checkbox::part(indicator) {
  stroke: var(--ig-secondary-500-contrast);
}

igc-checkbox::part(control checked)::after {
  border-radius: 4px;
  background: var(--ig-secondary-500);
}

    API References

    Additional Resources