Develop Reference

set the asp:textbox val() in jQuery and get the Text of the same on the server side code

I have successfully set the text of asp:textbox using jQuery val() function, now I want the same value of the textbox on click of asp:button on the server side code.
$("#textboxId").val('some text');
protected void button_Click(object sender, EventArgs e)
{
// getTheText is blank
string getTheText = textboxId.Text.Trim();
}

<script type="text/javascript">
$(document).ready(function () {
$('#<%= TextBox1.ClientID %>').val("my value");
});
</script>
and in code behind on button click use
protected void Button1_Click(object sender, EventArgs e)
{
var value = TextBox1.Text;
}
this will work. it work for me i test it.

I also had the same problem and finally found a solution.
string getheText =Page.Request.Form["textboxId"].ToString().Trim();
But be careful if you use "Content" in master page the id must be like that
string gettheText = Page.Request.Form["ctl00$ContentPlaceHolder1$textboxId"].ToString().Trim();

if your textbox is an aspx server control then you can directly set Text by using
textboxId.Text = "Some Value";

How to call onclientclick after onclick

I've got this button
<asp:Button runat="server" ID="btnReviewDocs" CssClass="btnReviewDocs" data-theme="b"
Text="Review Documents" OnClick="btnReviewDocs_Click" OnClientClick="clickHyperlink();"/>
And in 'OnClick' event I'm assembling an URL that I need to set to asp:Hyperlink and at the end of the 'OnClick' I'm setting this URL to the 'NavigateURL' propery of the 'asp:Hyperlink'. Once the 'asp:Hyperlink' has the correct URL I need to call the 'clickHyperlink()' function.
function clickHyperlink() {
var href = $('#hlnkID').attr('href');
if (typeof href !== "undefined") {
$.mobile.showPageLoadingMsg();
window.location.href = href;
}
}
But the 'OnClientClick' event is executed always before the 'OnClick'. Any suggestions for a workaround?
I'm doing all this stuff, because I've got problems with JQuery Mobile and 'Response.Redirect(url);' is changing the page, but not the URL.

I believe that you don't really need to involve the Hyperlink control in the JS part.
Modify your JS function and remove the OnClientClick attribute from the btnReviewDocs button:
<script type="text/javascript">
function clickHyperlink(href) {
$.mobile.showPageLoadingMsg();
window.location.href = href;
}
</script>
On the server, in the btnReviewDocs_Click method:
protected void btnReviewDocs_Click(object sender, EventArgs e)
{
// TODO: set the url, maybe append some params to the
// hlnkID.NavigateUrl value
var url = "http://stackoverflow.com/";
ClientScript.RegisterStartupScript(Page.GetType(),
"clickHyperlink",
"clickHyperlink('" + url + "');",
true);
}

Use the RegisterStartupScript in the ClientScript object to run the code after postback--->
protected void btn_Click(object sender, EventArgs e)
{
//some code
this.ClientScript.RegisterStartupScript(this.GetType(), "clintClick", "clickHyperlink", true);
}

try this
protected void btnReviewDocs_Click(object sender, EventArgs e)
{
//something doing here
Page.ClientScript.RegisterStartupScript(this.GetType(), "test", "<script type='text/javascript'>clickHyperlink()</script>");//call javascript function
}

The answer is mentioned by #Alex Filipovici.
But first you should ask yourself do you really need to go back to the client side to do a redirect ?
Why not call :
Response.Redirect("MyURL");

conditionally call JavaScript function

I have a "Pay" button where we are starting to accept credit card. I need to call a Javascript function from the server side click event. I tried with Response.Write as below but that does not trigger my function that is defined in the separate .js file. What else can I do?
protected void btmMakePayment_Click(object sender, EventArgs e)
{
if (user selected credit card)
{
Response.Write("<script language='javascript' type='text/javascript'>OpenPayPalDialog();</script>");
}
else
{
continue with the current server side logic
}
}
Thank You in advance.

Use ClientScriptManager.RegisterStartupScript, which registers a block of JavaScript to execute when the page loads.

You can use ScriptManager.RegisterClientScriptBlock to invoke JS event:
ScriptManager.RegisterClientScriptBlock(this, typeof(this), "JSKey", "JSFunctionName(<param>);", true);

Registering Javascript function that manipulates radwindow from ajaxified radgrid

I'm trying to open a radwindow client side with some registered script.
Question 1: Is there a reason radwindow wouldn't be found if executed on startup, if so why and how do I fix it?
Question 2: Whenever I ajaxify the radgrid the event no longer fires. This makes sense, as there is not a postback occurring, so the page never starts up. How do I get registered scripts to execute in an ajax enviornment?
---- Relevant Code Behind ----
protected void RadgridProjects_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)
{
if (e.CommandName == "Member")
{
Session["ProjectId"] = (e.Item as GridDataItem).GetDataKeyValue("ProjectId").ToString();
radGridProjectMembers.Rebind(); //Not the same grid!
ClientScriptManager cs = Page.ClientScript;
string js = "<script type='text/javascript'>ShowWindow()</script>";
cs.RegisterStartupScript(this.GetType(), "showwindow", js);
}
}
---- Javascript Function ----
function ShowWindow()
{
alert("code fired");
var radWin = $find("<%= RadWindow1.ClientID %>");
radWin.show();
radWin.moveTo(650, 450);
radWin.set_width(500);
radWin.set_height(400);
}
The window never opens, but my testing alert does fire. It should be noted that when I use a client event for the script the window DOES open.

Confirm function in codebehind

I my application i am using ajax(Updatepanel).I am using the following code to show confirmation dialog box after finishing some update process in database. but it is not working for me.
Problem:
Confirmation box is not displaying.
code:
protected void imbtnUpdate_Click(object sender, ImageClickEventArgs e)
{
// Database process
string javaScript = "<script language=JavaScript>\n " + "if(confirm('Do you want to update
the files?'))window.location.href = \"Upload.aspx?ID=" + ID +
"&pt=Gm&page=Gms\"; else return false;\n" + "</script>";
RegisterStartupScript("imbtnUpdate_Click", javaScript);
}

this code is just register on the page the javascript that say... if(... bla bla bla)...
Where is the function ?
The RegisterStartupScript, is not going to set on imbtnUpdateClick, this code, and is not going to call it on Clicking the Update.
Also you must always return false, from the code I see.
Advice: You the view page source code, to see the generated html and see what this code do and then you understand whats the problem.

Try this in your code behind:
imbtnUpdate.Attributes.Add("onclick", "return ConfirmUpdate();");
Then put your script into a javascript function called ConfrimUpdate()

Are you using AJAX?
Because if your button is in an update panel, and if you are trying to add this startup script on a partial-postback you should register it by using ScriptManager.
protected void imbtnUpdate_Click(object sender, ImageClickEventArgs e)
{
// Database process
string javaScript = "<script language=JavaScript>\n " + "if(confirm('Do you want to update
the files?'))window.location.href = \"Upload.aspx?ID=" + ID +
"&pt=Gm&page=Gms\"; else return false;\n" + "</script>";
// RegisterStartupScript("imbtnUpdate_Click", javaScript);
ScriptManager.RegisterStartupScript(Page, Page.GetType(),"imbtnUpdate_Click", javaScript , true);
}