Member Avatar for Ana D.

Hi,

In my asp.net page, I have the following line inside an UpdatePanel:

<input type="text" id="userInput" onblur="DisplayWord()" onkeyup="SearchWord(event, this.value)" />

Is there a way to retrieve the input value in the code behind (VB.NET)?

Thanks,

Ana

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  • Latest Post Latest Post by emmbec

Dani AI

Generated

Two practical approaches work for the scenario in this thread (inside an UpdatePanel): read the posted form value on a postback, or convert the input into a server control so the value is available directly in code-behind. As pointed out, reading HTTP form data is the simplest when you do not want runat="server". As hinted, server-side event handling only applies once the control participates in postbacks.

Checklist and VB.NET examples:

  • Make sure the input has a name attribute (browsers submit values by name, not id), and that it sits inside the page form.
  • Request.Form is populated only after a postback (async or full). If using UpdatePanel, ensure a control triggers the async postback or add an appropriate trigger.
' in Page_Load or an async-postback handler
Dim userValue As String = Request.Form("userInput")
If Not String.IsNullOrEmpty(userValue) Then
    ' process userValue
End If

If you convert the element to a server control you can read its property directly:

' with an asp:TextBox ID="txtUser" runat="server"
Dim val As String = txtUser.Text

Troubleshooting notes: missing name or placing the input outside the form prevents submission; JavaScript-only handlers do not reach server unless they cause a postback or call a WebMethod/PageMethod. See the Microsoft docs for the Request.Form collection for full behavior and examples: HttpRequest.Form.

Recommended Answers

All 3 Replies

Member Avatar for kvprajapati

Handles the Enter, Leave, and KeyPress events.

Member Avatar for emmbec

Handles the Enter, Leave, and KeyPress events.

What the heck? this has nothing to do with what Ana asked...

I am also interested in learning how to get the input value from the code behind without making the INPUT control have the "RUNAT server" code.

Thanks

Member Avatar for emmbec

I think I got it, use this to get the value of the input from the code behind:

String.Format("{0}", Request.Form["MyInputBox"])

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