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Get value from html side controls and pass it to server side controls

I have a question about server side and html side controls.
This is my code
ClientScript.RegisterStartupScript(this.GetType(),
"Enter Id",
" prompt('Enter your Id ....');",
true);
I want to get value that user entered?
What should I do?

Try this way
<form id="theform" runat="server">
<input type="hidden" id="hidValue" runat="server" />
</form>
Script for get value from hidden field
<script type="text/javascript">
function storeinput(id) {
document.getElementById("<%=hidValue.ClientID%>").value = id;
}
</script>
ClientScript.RegisterStartupScript(this.GetType(), "prompt", "var id = prompt('Enter your Id .'); storeinput(id);", true);

Please try below:
Please define hidden variable in ASPX page:
<input type="hidden" id="hidValue" runat="server" />
Please write below code at CodeBehind:
ClientScript.RegisterStartupScript(this.GetType(), "prompt", "document.getElementById('" + hidValue.ClientID + "').value = prompt('Enter your Id .'); alert(document.getElementById('" + hidValue.ClientID + "').value); ", true);

jQuery(function ($) does not work after partial update in updatepanel

<script type="text/javascript">
//http://digitalbush.com/projects/masked-input-plugin/
jQuery(function ($) {
//phone numbers
alert("test");
var txtInvestContactPhone = $("#<%=txtInvestContactPhone.ClientID%>");
$(txtInvestContactPhone).mask("(999) 999-9999");
});
</script>
i tried adding the pagerequestmanager to the content of the page, but i think i'm doing it wrong:
<script type="text/javascript">
Sys.WebForms.PageRequestManager.getInstance().add("jQuery(function ($)");
</script>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="true">
</asp:ToolkitScriptManager>
i've also tried to registerStartUp Script in my page_load event like so:
protected void Page_Load(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this, typeof(Page), Guid.NewGuid().ToString(), "jQuery(function ($);", true);
if (!Page.IsPostBack)
{
but this just breaks my accordion causing the panels to all be unclickable.
i think i'm on the right path here, just need some help with syntax.

jQuery(function ($); isn't a function that can be called, that's like... half a function.
Put your init code in it's own function definition, then call it from your DOM ready handler, and from your startup script.
function init() {
//phone numbers
alert("test");
var txtInvestContactPhone = jQuery("#<%=txtInvestContactPhone.ClientID%>");
jQuery(txtInvestContactPhone).mask("(999) 999-9999");
});
jQuery(function () { init(); });
...
ScriptManager.RegisterStartupScript(this, typeof(Page), Guid.NewGuid().ToString(), "init();", true);

Need to access variable from code behind. What i found shows how to go about it but i but the value keep displaying null

How to access and use javascript variables from code behind (C#). Upon research, i implemented the proccess in accessing the variables but i still do not get the values of the variables. Where am i going wrong?
//Javascript
<script type="text/javascript">
function OnSucceeded() {
var status = 65;
var state = "pass value"
document.getElementById("getValue").value = status;
document.getElementById("getvalues").value = state;
}
</script>
//
<asp:HiddenField ID="getValue" runat="server" Value="" />
<asp:HiddenField ID="getvalues" runat="server" Value="" />
<asp:Button ID="Button1" runat="server" OnClientClick="OnSucceeded()" Text="Button"
OnClick="Button1_Click" />
//C# code behind
ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + getvalues.Value + "');", true);

Use ClientID to render correct IDs of server controls
<script type="text/javascript">
function OnSucceeded() {
var status = 65;
var state = "pass value"
document.getElementById("<%= getValue.ClientID %>").value = status;
document.getElementById("<%= getvalues.ClientID %>").value = state;
}
</script>

How to call javascript on user control

I have webapplication in c# asp.net 4.0
I have User Control in that I have written javascript :-
<script>
function SetValue() {
alert(document.getElementById('offSetClient').value);
}
</script>
<asp:HiddenField ID="clientDateTime" runat="server" />
<asp:HiddenField ID="offSetClient" runat="server" Value="Test"/>
and this User Control added into a web form.
Please suggest me how can I call this javascript on User Control page load.

You can use Page.ClientScript.RegisterStartupScript to attain this.
protected void Page_Load(object sender, EventArgs e)
{
Page.ClientScript.RegisterStartupScript(GetType(), "ShowAlert", "SetValue('" + offSetClient.ClientID + "');", true);
}
Please add an input parameter for the function to get the object of hidden field and pass the same from function.
<script type="text/javascript">
function SetValue(objHdn) {
alert(document.getElementById(objHdn).value);
}
</script>

Retrieve selected tags from the Jquery Tag it! plugin on PostBack

I've found this nice jquery plugin tag it! http://levycarneiro.com/2010/03/tag-it-tag-suggestions-editor-and-autocomplete-in-a-jquery-ui-plugin/ and want to implement it into an ASP.Net application.
Upon inspecting the source code, I found out, that the plugin adds additional li items (with remove links and so on) into an ul.
How can I retrieve the selected tags upon a PostBack?

#citronas, i used this jQuery tag plugin: jQuery Tagit
I modified it as follows to both load the plugin with tags from the server side and retrieve selected tags on the server side.
...<script>
$(function () {
var availableTags = $("#<%= hdnDBTags.ClientID %>").val().split(',');
$('#demo1').tagit({ tagSource: availableTags, select: true });
$("#<%= btnGetTags.ClientID %>").click(function () {
getTagsString($('#demo1').tagit('tags'))
});
function getTagsString(tags) {
var string = "";
for (var i in tags) {
string += tags[i] + ",";
}
$("#<%= hdnSelectedTags.ClientID %>").val(string);
}
});
</script>
<asp:HiddenField ID="hdnDBTags" runat="server" />
<asp:HiddenField ID="hdnSelectedTags" runat="server" />
<h1>
Your Profile</h1>
<p>
<ul id="demo1" name="nameOfSelect">
</ul>
<asp:Button ID="btnGetTags" runat="server" Text="Get Tags" OnClick="btnGetTags_Click" />
</p>
And in the code behind:
protected void Page_Load(object sender, EventArgs e)
{
hdnDBTags.Value = "real_estate,mortgage_lending";
}
protected void btnGetTags_Click(object sender, EventArgs e)
{
string test = hdnSelectedTags.Value;
IList<string> array = test.Split(',').ToList();
array.Remove("");
}
Hope this helps...
D