How to call a C# Method on KeyPress of the TextBox Asp.net Application.

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Hi,

How to call a C# Method on KeyPress of the TextBox in Asp.net Application.

Please provide the one sample for the same

Posted 18-Oct-13 6:10am

Ganesh_verma

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Richard C Bishop 18-Oct-13 12:13pm

Well, you call the method inside the KeyPress event handler.

Ganesh_verma 18-Oct-13 12:16pm

But there is no keypress event in Web application.

Richard C Bishop 18-Oct-13 12:18pm

So use OnTextChanged. It is basically the same thing.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 1-Nov-13 1:58am

Show your progress. What have you tried?

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Mahesh Meegasmullage · Answer 1 · 2013-10-18T18:19:00

In ASP.NET Page

ASP.NET

<asp:textbox id="MyTextBox" runat="server" onkeypress="__doPostBack(this.name,'OnKeyPress');" ></asp:textbox>

In CodeBehined file

C#

protected void Page_Load(object sender, EventArgs e){
    var ctrlName = Request.Params[Page.postEventSourceID];
    var args = Request.Params[Page.postEventArgumentID];

    if(ctrlName == MyTextBox.UniqueID && args == "OnKeyPress"){
        MyTextBox_OnKeyPress(ctrlName, args);
    }
}

private void MyTextBox_OnKeyPress(string ctrlName, string args){
    //your code goes here
}

Every time you press a key page get submitted which causes the page to be refreshed totally.
Use updated panels to avoid full page submissions.

Hope this will help you

User 9395138 · Answer 2 · 2013-10-18T07:03:00

Solution 1

You can use Javascript.

C#

OnPageLoad()
 {
  TextboxId.Attributes.Add("onclick") = "myfunction(this.Id)";
 }

Javascript on aspx file:

JavaScript

myfunction(textboxid){
//do your stuff
}

Posted 18-Oct-13 7:03am

User 9395138

Updated 11-Sep-14 1:52am

v2

S. M. Ahasan Habib · Answer 3 · 2013-10-18T18:05:00

Yes it is correct in asp.net server side control text box has no any keypress event. OnTextChange is there the code smample like
Server side code

C#

protected  void My_OnTextChanged(object sender, EventArgs e)
       {
           var txt = sender as TextBox;
           string value = txt.Text;
       }

In markup declaration

<asp:textbox id="txtOne" runat="server" ontextchanged="My_OnTextChanged" autopostback="true" xmlns:asp="#unknown">

Just remember that AutoPostBack property is very important there without that the textbox control will not be postback. Another is when you finish to write your data to the textbox after that when you press enter or tab that time the event is triggered. It is similar to lost focus event of windows application.
If you really want to go actual keypress event then you must go dom key press event and use javasript/jquery for subscribe that event.

//DOM ready event
$(function(){
//subscibe keypress event
$("[id$='txtOne']").bind('keypress', function(event){
//your key handling code is there
});
}).

How to call a C# Method on KeyPress of the TextBox Asp.net Application.

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