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Issue with setting hidden field in asp.net winforms using jquery

I have some code to set the value of a hidden field so I can access it in the code behind but the value is always empty in the code behind. The value for the effectiveDate is being set but I doesn't look like the hidden field property Value is being set.
<input id="appEffectiveDate" type="text" />
<label id="effectiveDateLabel" for="appEffectiveDate">App Effective Date</label>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<asp:HiddenField ID="appEffectiveDateToSetForUserRole" runat="server" Value="" Visible="false" />
<script>
$(function () {
var SelectedDates = {};
$('#appEffectiveDate').datepicker({
beforeShowDay: function (date) {
var Highlight = SelectedDates[date];
if (Highlight) {
return [true, "Highlighted", Highlight];
}
else {
return [true, '', ''];
}
}
});
$("#effectiveDateLabel").hide();
$("#appEffectiveDate").hide();
$('input[value="85"]').click(function () {
if($(this).is(':checked'))
{
$("#effectiveDateLabel").show();
$("#appEffectiveDate").show();
}
});
$("#appEffectiveDate").change(function () {
var effectiveDate = $("#appEffectiveDate").val();
$(":asp(appEffectiveDateToSetForUserRole)").prop('value', effectiveDate);
});
});
</script>
In the code behind the value is empty for the hidden field:
if (!string.IsNullOrEmpty(appEffectiveDateToSetForUserRole.Value))
{
// this is never called because .Value is empty
}

If Visible is set to false, the control will not be rendered by ASP.NET in the markup at all, which means that jQuery won't be able to find it because it doesn't exist. Just remove the visible=false part. It'll stay hidden.

ASP .NET Cannot get Label text generate by autocomplete in code behind

Like the title, I used jquery autocomplete to set some text to some of my labels. Then, click save, but the event save in code behind only recieve "" from the labels.Text even though they already have text. Here is my code.
<input id="search" type="text" placeholder="search" />
...
<asp:Label ID="LabelNYCNhanVienName" runat="server"></asp:Label>
...
<script type="text/javascript">
$(document).ready(function () {
$("#search").autocomplete({
showHeader: true,
select: function (event, ui) {
this.value = (ui.item ? ui.item.FullName : ' ');
$('#<%= LabelNYCNhanVienName.ClientID %>').text(ui.item ? ui.item.bab: ' ');
return false;
},
minLength: 2,
source: function (request, response) {
$.ajax({
...
});
}
});
});
code Behind:
void ButtonSave_Click(object sender, EventArgs e)
{
Titi item = new Titi ();
item.titiName = LabelNYCNhanVienName.Text;
//My problem is here: the LabelNYCNhanVienName.Text always
//return "" even when i use firebug at that time to catch the LabelNYCNhanVienName
//It still have text in it.
OnSave_Event(item);
}
Here is the picture when i debug. At the save event, the Label still has Text:
Hope you can help me get text from the labels. Thank you

How to update ASP Web application Literal or Label after user presses button

Warning: I am a novice when it comes to ASP and javascript - I'm more used to desktop apps. Web development is completely new to me.
I have inherited an ASP.net project that I need to keep up-to-date.
My current problem is that I need to display the client time in a text control (label or literal control - doesn't have to specifically be one of those, I just need to show it in text) when the user has clicked a button to 'Save'. If I do it server-side, in the 'SaveChanges' function, I get the time of where the server is.
My button is defined as below:
<asp:Button ID="Save" runat="server" Text="Save Changes" OnClick="SaveChanges"
ValidationGroup="ProjectSummaryValidationGroup"
meta:resourcekey="SaveResource1" />
And my Literal/Label is:
<asp:Label ID="SaveTime" runat="server"></asp:Label>
I have found a javascript function to calculate the client time from one of the other questions on here: (EDIT: I have updated this function so that the text value of my label is being assigned a value)
<script type="text/javascript">
function GetDate(date) {
CurTime = new Date(date);
var offset = (new Date().getTimezoneOffset() / 60) * (-1);
var utc = CurTime.getTime() + (offset * 60000 * (-1));
var serverDate = new Date(utc + (3600000 * offset));
var dateString = (serverDate.getMonth() + 1) + "/" + serverDate.getDate() + "/" +
serverDate.getFullYear() + " " + serverDate.toLocaleTimeString("en-US", { hour12: true });
document.getElementById('<%=SaveTime.ClientID%>').Text = dateString;
}
</script>
My problem is I don't know where to put this javascript function in my apsx page, or how to set the Text value of my label to the date string calculated in the function. I don't even know for sure how to 'call' this function...
So my questions are:
Where do I have to define the javascript function?
How to I 'call' this javascript function when the user clicks the 'Save' button, so that the text one my age is updated?

You can use Java Script Function like
<script type="text/javascript" language="javascript">
function javascriptFunction()
{
}
</script>
call this function
If you Used Update Panels Then You can Use in .Cs Page:
ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(), "javascriptFunction();", true);
or On Button's Click in .aspx page
<asp:Button ID="Save" runat="server" Text="Save Changes" OnClick="SaveChanges"
onClientClick="javascriptFunction();"
ValidationGroup="ProjectSummaryValidationGroup"
meta:resourcekey="SaveResource1" />
Other Wise You can Use in .cs page
ClientScript.RegisterStartupScript
(GetType(),Guid.NewGuid().ToString(), "javascriptFunction();",true);
set value of Label in javascript:
document.getElementById('<%=SaveTime.ClientID%>').value = "Your Date";
for label :
void Page_Load(object sender, EventArgs e)
{
lblMyLabel.Attributes.Add("onclick",
"javascript:alert('ALERT ALERT!!!')");
}

How to get hidden field value code behind updated by jquery/javascript

I have an <asp:menu/> control and a hidden field.Now i am using jQuery to change value of hidden field.
Code is:-
$(function() {
$(".primaryStaticMenu tr,td").each(function(index) {
$(this).click(function() {
if ($(this).attr("title") != "undefined"
&& $(this).attr("title").length > 0) {
document.getElementById('ctl00_Hidden_Master_Location').value = $(this).attr("title");
alert(document.getElementById('ctl00_Hidden_Master_Location').value);
//return false;
}
});
});
});
Server side code to get updated value is:-
string Get_cng_value = Hidden_Master_Location.Value;
But Hidden_Master_Location.Value shows null every time.
can any one tell me how to get updated value of hidden field from code behind.

Let say your hidden field is as..
<asp:HiddenField ID="Hidden_Master_Location" runat="server" />
you can get the value of hidden filed in jquery as
var locationValue= $("#<%= Hidden_Master_Location.ClientID %>").val();

Do this, it works for me.the trick is to save your hidden field precious id in another hidden input field then build it back using that hidden value.
Markup
<asp:HiddenField ID="HiddenFieldMaster" runat="server" />
<input type="hidden" id="inputHidden" value='<%= HiddenFieldMaster.ClientID%>' />
Javascript
$(function() {
$(".primaryStaticMenu tr,td").each(function(index) {
$(this).click(function() {
if ($(this).attr("title") != "undefined"
&& $(this).attr("title").length > 0) {
var inputHidden = document.getElementById('inputHidden');
$("#" + inputHidden.value).val($(this).attr("title"));
alert(inputHidden.value);
//return false;
}
});
});
});
Code Behind
String Get_cng_value = HiddenFieldMaster.Value;

ASP C# | MessageBox Keeps Displaying

I have a JavaScript MessageBox that keeps displaying when I click events in a Repeater or refresh the current page.
Here is the function:
public myFunctions()
{
}
/** Display Successs/Error Message **/
public void DisplayUserMessage(string messageType, string messageString, Label ErrorMessageLabel)
{
ErrorMessageLabel.Visible = true;
ErrorMessageLabel.Text = "<b>" + messageType.Substring(0, 1).ToUpper() + messageType.Substring(1).ToLower() + ":</b> " + messageString;
ErrorMessageLabel.CssClass = messageType.ToLower() + "_message";
}
public void HideUserMessage(Label ErrorMessageLabel)
{
ErrorMessageLabel.Visible = false;
ErrorMessageLabel.Text = "";
ErrorMessageLabel.CssClass = "";
}
Here is the jquery to make it fade out:
$(document).ready(function () {
/** Success/Error Messages **/
$('.success_message').animate({ opacity: 1.0 }, 2000).fadeOut('slow');
$('.error_message').animate({ opacity: 1.0 }, 2000).fadeOut('slow');
});
Here it is on the MasterPage:
<!-- Message Box -->
<div id="msgBox" runat="server">
<asp:Label ID="ErrorMessageLabel" CssClass="" runat="server" Visible="false"></asp:Label>
</div>
Here is the script in the code-behind when a success occurs:
Label ErrorMessageLabel = (Label)Master.FindControl("ErrorMessageLabel");
new myFunctions().DisplayUserMessage("success", "Administrator Updated!", ErrorMessageLabel);
Anyone know how I can stop it from continually showing up after I click another button or refresh the page?

Use a hidden input and set the value when success function is called. All the other times reset the value. In your document ready function check the value of the hidden element and then call the animate function.
<input id="txtHidSuccess" type="hidden" runat="server" />
In page load
txtHidSuccess.Value = "0";
In the success/error function
txtHidSuccess.Value = "1";
jQuery
$(function(){
if ($("#txtHidSuccess").val() === "1") {
/** Success/Error Messages **/
$('.success_message').animate({ opacity: 1.0 }, 2000).fadeOut('slow');
$('.error_message').animate({ opacity: 1.0 }, 2000).fadeOut('slow');
}
});

I see where you're calling DisplayUserMessage(), but not HideUserMessage(). My guess is that when you set the ErrorMessageLabel properties, they're stored in the View State persisted across postbacks.
Rather than use an ASP.NET Label control, you could try just wrapping some text with a regular div and use CSS to hide it. When the success event occurs in your app, you can use ClientScriptManager.RegisterStartupScript() to write a script to the client that shows the div. Then, your animate functions can fade out the div if it's visible.

if(IsPostBack)
new myFunctions().HideUserMessage(ErrorMessageLabel);
This worked. Thanks #Harie