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Native Events in Blazor TextBox component

The following section explains the steps to include native events and pass data to event handler in textbox component.

Bind native events to textbox

You can access any native event by using on <event> attribute with a component. The attribute’s value is treated as an event handler.

In the following example, the KeyPressed method is called every time the key is pressed on textbox.

@using Syncfusion.Blazor.Inputs

<SfTextBox Placeholder='First Name' @onkeypress='@KeyPressed'></SfTextBox>

@code {
    public void KeyPressed(){
      Console.WriteLine("Key Pressed!");

Also, you can rewrite the above example code as follows using Lambda expressions.

@using Syncfusion.Blazor.Inputs

<SfTextBox Placeholder='First Name' @onkeypress="@(() => Console.WriteLine("Key Pressed!"))">

Pass event data to event handler

Blazor provides set of argument types for map to native events. The list of event types and event arguments are:

  • Focus Events - FocusEventArgs
  • Mouse Events - MouseEventArgs
  • Keyboard Events - KeyboardEventArgs
  • Input Events - ChangeEventArgs/EventArgs
  • Touch Events – TouchEventArgs
  • Pointer Events – PointerEventArgs

In the following example, the KeyPressed method is called every time any key is pressed inside textbox. But the message will be printed when you press “s” key.

@using Syncfusion.Blazor.Inputs

<SfTextBox Placeholder='First Name' @onkeypress='@(e => KeyPressed(e))' ></SfTextBox>

@code {
  public void KeyPressed(KeyboardEventArgs args) {
    if (args.Key == "s") {
      Console.WriteLine("S was pressed");

Using Lambda expression also, you can pass the event data to the event handler.

List of Native events supported

List of Native events
onclick onblur onfocus onfocusout
onmousemove onmouseover onmouseout onmousedown
ondblclick onkeydown onkeyup onkeypress
ontouchend onfocusin onmouseup ontouchstart