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I have a Textbox that changes the content of a dropdown in the OnTextChanged event. This event seems to fire when the textbox loses focus. How do I make this happen on the keypress or keyup event?
Here is an example of my code
<asp:TextBox ID="Code" runat="server" AutoPostBack="true" OnTextChanged="Code_TextChanged"> <asp:UpdatePanel ID="Update" runat="server"> <ContentTemplate> <asp:DropDownList runat="server" ID="DateList" /> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="Code" /> </Triggers> </asp:UpdatePanel> So in the codebehind, I bind the dropdown on page load. The Code_TextChanged event just rebinds the dropdown. I would like this to happen on each keypress rather than when the textbox loses focus.
I inherited this code recently and this is not the ideal method of doing this for me, but time limitations prevent me from rewriting this in a web servicy method.
I have tried using jQuery to bind the "keyup" event to match the "change" event for the textbox, but this only works on the first key pressed.
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This will solve your problem. Logic is same as the solution suggested by Kyle.
Have a look at this.
<head runat="server"> <title></title> <script type="text/javascript"> function RefreshUpdatePanel() { __doPostBack('<%= Code.ClientID %>', ''); }; </script> <asp:TextBox ID="Code" runat="server" onkeyup="RefreshUpdatePanel();" AutoPostBack="true" OnTextChanged="Code_TextChanged"></asp:TextBox> <asp:UpdatePanel ID="Update" runat="server"> <ContentTemplate> <asp:DropDownList runat="server" ID="DateList" /> <asp:TextBox runat="server" ID="CurrentTime" ></asp:TextBox> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="Code" /> </Triggers> </asp:UpdatePanel> Code behind goes like this...
protected void Code_TextChanged(object sender, EventArgs e) { //Adding current time (minutes and seconds) into dropdownlist DateList.Items.Insert(0, new ListItem(DateTime.Now.ToString("mm:ss"))); //Setting current time (minutes and seconds) into textbox CurrentTime.Text = DateTime.Now.ToString("mm:ss"); } I have added additional textbox to see change in action, do remove the textbox.
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