RegisterJSFunction Method (WebControl)
- Last UpdatedSep 29, 2026
- 1 minute read
Register a function that can be called from JavaScript code.
'Declaration
Public Sub RegisterJSFunction( _
ByVal functionName As String, _
ByVal handler As JSFunctionInvokeHandler _
)
public void RegisterJSFunction(
string functionName,
JSFunctionInvokeHandler handler
)
public:
void RegisterJSFunction(
String^ functionName,
JSFunctionInvokeHandler^ handler
)
Parameters
- functionName
- The JavaScript function name.
- handler
- The code to be executed when the function is called. Important note: Do not call any JavaScript code inside this callback handler code as this can cause re-entrancy issues. Calling Javascript code from within this callback is not supported.
Target Platforms:
- Windows 10 Enterprise, IoT Enterprise 2019 LTSC (1809)
- Windows 10 Enterprise 2021 LTSC (21H2)
- Windows 10 IoT Enterprise (Only) 2021 LTSC (21H2)
- Windows 11 Enterprise, IoT Enterprise 2024 LTSC 24H2
- Windows Server 2019 LTSC (Datacenter, Essentials, Standard)
- Windows Server IoT 2019 LTSC
- Windows Server 2022 LTSC Standard and Datacenter
- Windows Server 2025 LTSC Standard and Datacenter