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Ajax, Render JavaScript inside Update Panel

Posted on 2007-08-09
Medium Priority
Last Modified: 2013-11-05
I use a javascript to "auto complete" text boxes when typing
It connect itself to a textbox by document.getElementById('" + tbxTwo.ClientID + "')

this works well if the text box is rendered in Page_Load
But if I inside a UpdatePanel, presses a button to get the Text Box and the javascript, it will not work.

I can understand why, probably doesn't the web browser render the javascript code inside the update panel after postback.

how do I solve this?

My example is here: http://dev.brightville.com/temp/javascript.aspx

and the code for this example is here:
aspx: http://www.aspsidan.se/code/default.asp?c=7723
code behind: http://www.aspsidan.se/code/default.asp?c=7724
Question by:jimmieandersson
  • 5
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LVL 41

Expert Comment

ID: 19671930
It appears like the code that is returned when the form is submitted doesn't have the keypress event handler defined.  The code that gets returned (for the second input field) should include the associated eventHandler to process the keys as they are pressed.
LVL 41

Expert Comment

ID: 19671962
If you start things out with

<asp:Panel ID="pnlTwo" runat="server" Visible="true">

does it act any differently?

Author Comment

ID: 19672199
yes if I start with visible="true" on page_load it works perfectly fine.
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LVL 41

Expert Comment

ID: 19672644
wow, that's very strange.  It is as though the invocation of the BtnTwo_Click function is doing more than just making that panel visible.

I'm sorry, but I know very little about ASP.NET, so I'm not sure what is happening.

Author Comment

ID: 19673816
its seems like the javascript block set to ltlTwo is not rendered in web browser after postback in the update panel.

someone told me that the update panel doesn't read the <script> block and that I have to use ScriptManager.RegisterClientScriptBlock but I don't know how to do that.

Author Comment

ID: 19673984
I solved it!

        protected void BtnTwo_Click(object sender, EventArgs e)
            string script = "var obj = actb(document.getElementById('" + tbxTwo.ClientID + "'),customarray);";

            ScriptManager.RegisterClientScriptBlock(uppSecond, this.GetType(), "init", script, true);
            pnlTwo.Visible = true;

LVL 41

Accepted Solution

HonorGod earned 1500 total points
ID: 19674077
Excellent.  Glad to hear it.
LVL 41

Expert Comment

ID: 19680260
Thanks for the points.  Good luck

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