QRCode Overview

The QRCode TagHelper and HtmlHelper for ASP.NET Core are server-side wrappers for the Kendo UI QRCode widget. To add the component to your ASP.NET Core app, you can use either.

QR codes take a piece of information from a transitory media, place it into the cell phone, and enable the cell phone to quickly read these generated images. All graphics are rendered on the client by using Canvas or SVG.

The QRCode generates Canvas and Scalable Vector Graphics (SVG) images that represent Quick Response (QR) codes.

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To see the component in action, check the examples:

Initializing the QRCode

The following example demonstrates how to define the QRCode.

    @(Html.Kendo().QRCode()
      .Name("qrUrl")
    <kendo-qrcode name="qrUrl"></kendo-qrcode>

Basic Configuration

To configure the QRCode, pass the configuration options as attributes, for example:

  • The name of the QRcode is mandatory—it specifies the "id" attribute of the widget.

  • The value attribute allows you to set the initial value of the widget.

  • The error correction level allows you to control the density of the QRcode image.

    Html.Kendo().QRCode()
        .Name("qrUrl")
        .Value("https://docs.telerik.com/aspnet-core/introduction")
        .ErrorCorrection(QRErrorCorrectionLevel.M)
        .Size(150)
        .Border(border => border.Color("#AA11AA").Width(2))
    )
)
    <kendo-qrcode name="qrUrl" 
                  value="https://docs.telerik.com/aspnet-core/introduction" 
                  error-correction="QRErrorCorrectionLevel.M 
                  size=" 150">
        <border color="#AA11AA" width="2" />
    </kendo-qrcode>

Functionality and Features

The QRCode supports a set of encoding conventions.

Referencing Existing Instances

To reference an existing QRCode instance, use the jQuery.data() configuration option. Once a reference is established, use the QRCode client-side API to control its behavior.

// Place the following after the declaration of the QRCode for ASP.NET Core.
<script>
    $(function() {
        // The Name() of the QRCode is used to get its client-side instance.
        var qrcode = $("#qrcode").data("kendoQRCode");
    });
</script>

See Also

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