How to Read textbox vlaue from updatepanel value comes from javascript and textbox is disabled

If you have to change your textbox value using javascript if you are using update panel you can use the following code for changing the value and before doing that check the following instructions.

1. Makesure that you are returning false after assigning the new value to the textbox if you are not returning anything your assigned value in the textbox will replace to the previous value.

2.Download the new jquery library from here

http://code.jquery.com/jquery-1.10.2.min.js[^]

Use your code like this

Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(function () {
$("<%=Button1.ClientID").click(function(){
document.getElementById("<%=TextBox1.ClientID %>").value = "hello";
});
});


<asp:button id="Button1" runat="server" text="Click" xmlns:asp="#unknown">

<asp:textbox id="TextBox1" runat="server" xmlns:asp="#unknown">


And add the same code inside the document.ready function

this is my script put this in header

<script type="text/javascript">
    function ChangeValue() {

        document.getElementById("<%=TextBox1.ClientID %>").value = "hello";
        return false;
    }
</script>

put following code in div of body

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return ChangeValue()" AutoPostBack="false" onclick="Button1_Click" />

<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true"  ></asp:TextBox>

Happy coding!!!

Hi,

Actually you have two query, I am not getting you in your textbox query. For FileUpload control in Update panel try to use AsyncFileUpload control[^]. Normal FileUpload control will not work Asynchronously.

Best luck.
-Amit