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ASP.NET passing a function return value from a modalpopupextender to the main form

I have looked at a number of solutions to my basic issue, but have not found any solution that I either understand or that would work.
I have a page that takes in two items of information, filename and a store. The user then clicks on a button to execute a function that will update a database and send back a resulting string that I want to display on a textbox on the main form.
However, when they press the button I call a modalpopupextender using an UpdatePanel panel. That gets a value into the modalpopup. If the user validates that the correct store is selected they click an 'okay' button which then call the dbprocessing function that returns a result. The page is small so I'll give the complete aspx and c# code.
The function doProcess() returns a List of values which I convert to String for display. I left the session variables in for that was my last attempt at trying to get this to work.
Where I am confused is that when the first button on the main form (Process) is clicked, there is a postback which obviously hits the page load before the button click. That is when I display the popup. Then when the user clicks on the button Okay, another postback is perform hitting page load before the button click and in that second button I originally tried to set the textbox on the main page because there is no other action after the second click, but no data displayed.
What is strange, if I repeat the process, when I click to display the popup, my data displays. This is not making sense.
This is the aspx page
<%# Page Title="Product Rank Loader" Language="C#" MasterPageFile="~/OMnested.master" AutoEventWireup="true" CodeBehind="ProductRankLoader.aspx.cs" Inherits="OrderManager.ProductRankLoader" %>
<%# Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<script type="text/javascript" src="Scripts/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="Scripts/local.js"></script>
<script type="text/javascript">
function callme(thisone)
{
$("#ddlStores").prop('disabled', false);
}
</script>
<div>
<table style="width: 500px">
<tr>
<td>
<asp:Label ID="lblMessage" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td>
<asp:FileUpload ID="fulRanks" runat="server" Width="315px" />
</td>
</tr>
<tr>
<td>
<asp:DropDownList ID="ddlStores" runat="server" Height="16px" Width="155px">
<asp:ListItem Value="0">Select Store</asp:ListItem>
<asp:ListItem Value="10101">Parkseed</asp:ListItem>
<asp:ListItem Value="10151">Wayside</asp:ListItem>
<asp:ListItem Value="10201">Jackson (JP)</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td style="height: 20px; padding-top: 15px; padding-bottom: 15px; padding-left: 20px;">
<asp:Button ID="btnProcess" runat="server" Text="Process" Width="89px" OnClick="btnProcess_Click" />
</td>
</tr>
<tr>
<td>
**<asp:TextBox ID="txtResults" runat="server" Height="200px" ReadOnly="True" TextMode="MultiLine"></asp:TextBox>**
</td>
</tr>
</table>
<asp:HiddenField ID="hdnFilename" runat="server" />
</div>
<asp:UpdatePanel id="updVerifyChoice" runat="server">
<ContentTemplate>
<div style="display: none;">
<asp:Button ID="btnDummy" UseSubmitBehavior="true" OnClientClick="ShowModalPopup" OnClick="btnDummy_Click" runat="server" />
<%--Dummy Button added to assign the target controlid of PopupExtender--%>
<asp:Button ID="btnDummyButton" UseSubmitBehavior="true" runat="server" Text="DummyButton" Style="display: none;" />
</div>
<asp:Panel ID="pnlVerifyRequestPopup" runat="server">
<div style="background: #fff; padding-left: 3px; border: 1px solid #989898; border-top: 1px solid #989898 !important;">
<table style="background-color: #F7F5F4; width: 300px;">
<tr>
<td><label>Verify Process Request</label></td>
<td style="text-align: right;">
<label class="lbl_3">
<asp:LinkButton ID="lBtnVerifyRequestClose" CssClass="lnkCloseheaderedit" Text="Cancel"
runat="server" OnClick="lBtnBillUpdPopClose_Click" /></label>
</td>
</tr>
<tr>
<td style="width: 150px;" colspan="2">
<asp:Label ID="lblWarn" runat="server" Text="" Font-Size="Medium" ForeColor="#CC3300"></asp:Label>
</td>
</tr>
<tr>
<td colspan="2" class="align_right">
<asp:Button ID="btnPopVerify" runat="server" CssClass="order_searchbtn" Text="Okay"
OnClick="btnPopVerify_Click" />
</td>
</tr>
</table>
<asp:HiddenField ID="hdnReturnData" runat="server" />
</div>
</asp:Panel>
<ajax:ModalPopupExtender ID="extVerifyProcess" runat="server" BehaviorID="extndPopBillUpdBehId"
TargetControlID="btnDummyButton" PopupControlID="pnlVerifyRequestPopup" CancelControlID="lBtnVerifyRequestClose">
</ajax:ModalPopupExtender>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
The field in question that should get the returned values from the function is called txtResults.
Here is the c# code (I cut out unneeded code)
namespace OrderManager
{
public partial class ProductRankLoader : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
var currentUser = Request.LogonUserIdentity.Name.Split('\\')[1];
// Session.Add("returnText", "");
var header = Master.FindControl("lblpageheading") as Label;
header.Text = "Product Rank Loader";
if (IsPostBack)
{
try
{
//if (Session["Verified"].ToString() != "")
//{
Session["returnText"] = doProcess();
if (Session["returnText"].ToString() != "")
{
txtResults.Text = Session["returnText"].ToString();
lblMessage.Text = "";
}
//}
}
catch { }
} else
{
Session.Add("returnText", "");
Session.Add("Verified", "");
}
}
protected void btnProcess_Click(object sender, EventArgs e)
{
Boolean fileOK = false;
string filename = Path.GetFileName(fulRanks.FileName);
hdnFilename.Value = filename;
if (fulRanks.HasFile)
{
ddlStores.Enabled = true;
String fileExtension =
System.IO.Path.GetExtension(fulRanks.FileName).ToLower();
String[] allowedExtensions = { ".txt", ".log" };
for (int i = 0; i < allowedExtensions.Length; i++)
{
if (fileExtension == allowedExtensions[i])
{
fileOK = true;
fulRanks.SaveAs(#"c:\temp\" + filename);
}
}
}
if (!fileOK || ddlStores.SelectedIndex <= 0)
{
lblMessage.Text = "Either the file name is incorrect or a store has not been selected.";
return;
} else { }
lblWarn.Text = "You are going to update item Ranks for store <br />" + ddlStores.SelectedItem + ".<br /><br />Press 'Okay' to process";
Session.Add("Verified", "true");
extVerifyProcess.Show();
}
protected void lBtnBillUpdPopClose_Click(object sender, EventArgs e)
{
Session["Verified"] = "";
Session["returnText"] = "";
Response.Redirect("ProductRankLoader.aspx");
}
protected void btnPopVerify_Click(object sender, EventArgs e)
{
//Session["returnText"] = doProcess();
Session.Remove("returnText");
Session.Remove("Verified");
}
private string doProcess()
{
string tmpResults = "";
Int32 store = 0;
if (ddlStores.SelectedIndex > 0)
{
Int32.TryParse(ddlStores.SelectedValue.ToString(), out store);
string filename = hdnFilename.Value;
ProductRankLoaderDLL.ProductRankLoaderDLL newRanks = new ProductRankLoaderDLL.ProductRankLoaderDLL(xxx);
List<string> results = newRanks.ProcessRanks();
foreach (string result in results)
{
tmpResults += result + '\r';
}
// txtResults.Text = tmpResults;
lblMessage.Text = "";
}
else
{
lblMessage.Text = "";
}
return tmpResults;
}
protected void btnDummy_Click(object sender, EventArgs e)
{
}
}
}

If I don't misunderstand your request your problem is caused by the postbacks. I think you can handle better your logic with jquery. For example you can use jquery to close the popup without performing postback:
$('#lBtnVerifyRequestClose').click(function (event) {
event.preventDefault();
$('#pnlVerifyRequestPopup').dialog('close');
});
the event.preventDefault() ensure that postback are not executed.
If you need server logic to put data on your popup you can bind a jquery function to the dialog on open event and retrieve there data / perform your logic. In this way your form will be submitted to the server only once at the end of the process.

Disable asp imagebutton

I am trying to get the image button in this table to get hidden via the code behind in C# (so that I can hide it after an action).
<asp:UpdatePanel runat="server" ID="upEmpListContainer" UpdateMode="Conditional"
OnPreRender="upEmpListContainer_PreRender" OnInit="upEmpListContainer_Oninit">
<ContentTemplate>
<asp:ListView ID="lvEmpList" OnItemDataBound="lvEmpList_ItemDataBound" OnDataBound="lvEmpList_DataBound"
OnLayoutCreated="lvEmpList_LayoutCreated" runat="server" OnPreRender="lvEmpList_PreRender">
<LayoutTemplate>
<table class="formData_tb" cellspacing="0" style="margin: 0px; width: 100%;">
<tr>
<th colspan="9" class="currentManagerLabel" style="text-align: center">
<span>Currently displaying
<asp:Label ID="lblManager" runat="server" />
employees </span>
<asp:ImageButton ID="DrillUp" AlternateText="Move up in reporting heirarchy" runat="server"
CommandName="DrillDown" ImageUrl="~/images/icoDoubleArrowUp.gif" OnCommand="butDrillDown_Click" />
</th>
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
</ContentTemplate>
</asp:UpdatePanel>
I just can't seem to access it from its ID. I've tried DrillUp.Enabled = false; but Visual Studio is saying that it can't resolve symbol 'DrillUp'.

Your imagebutton is inside layout template, you cant access it directly.
Try this
ImageButton b = (ImageButton)lvEmpList.FindControl("DrillUp");
b.Visible = false;

In your code behind method lvEmpList_ItemDataBound, you need to use the following:
((e.Item.FindControl("DrillUp")) as ImageButton).Visible = false;
Also, you should add a check that this is done only for the DataItem items like this:
if (e.Item.ItemType == ListViewItemType.DataItem)
{
((e.Item.FindControl("DrillUp")) as ImageButton).Visible = false;
}

Try to:
1-remove that imagebutton from aspx
1-clean the solution
2- Write manually again that asp:imagebutton...
It will work fine

Passing variables to javascript in onclientclick

Okay, i think i've tried 3-4 methods here from stackoverflow, but none seems to work.
I've got:
OnClientClick='<%# Eval("albumName", "doConfirm(\"delete\", \"{0}\");").ToString() %>'
but in html it renders as:
onclick="doConfirm("delete", "Test");"
Also tried making a method to call:
public string CreateConfirmation(String action, String item) {
return String.Format(#"return confirm('Sikker på du vil {0}: {1}');", action, item);
}
With this:
OnClientClick='<%# CreateConfirmation("delete", (string)Eval(albumName)) %>'
But gives me exact same problem....
So im pretty lost?

I apologize in advance for such a long answer, but I wanted to be thorough.
This is apparently a "security" feature in .Net 4.0 (and higher). You can read more about it at:
http://avinashsing.sunkur.com/2010/10/29/asp-net-html-encoding-attributes-in-server-controls/
http://forums.asp.net/p/1554455/3818604.aspx
Stop the tag builder escaping single quotes ASP.NET MVC 2
All of the above links also recommend declaring a public class to override the behavior:
public class HtmlAttributeNoEncoding : System.Web.Util.HttpEncoder
{
protected override void HtmlAttributeEncode(string value, System.IO.TextWriter output)
{
output.Write(value);
}
}
and then adding this to the <system.web> element in your web.config:
<httpRuntime encoderType="HtmlAttributeNoEncoding"/>
This definitely fixes the rendering problem, so that quotes and apostrophes render as " and ' (as expected).
That said, I tested your problem with the following:
<script type="text/javascript">
var doConfirm = function (action, item) {
alert('Sikker på du vil ' + action + ': ' + item);
return false;
};
</script>
<p>Some "arbitrary" text. <asp:Button ID="Button3" runat="server" Text="Button" OnClientClick="doConfirm('delete', 'myalbum');" /></p>
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick='<%# Eval("albumName", "doConfirm(\"delete\", \"{0}\");").ToString() %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Album Name" DataField="albumName" />
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="Button2" runat="server" Text="Button" OnClientClick='<%# CreateConfirmation("delete", (string)Eval("albumName")) %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and in the code-behind:
public partial class _Default : System.Web.UI.Page
{
public string CreateConfirmation(String action, String item)
{
return String.Format(#"return doConfirm('{0}', '{1}');", action, item);
}
protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
DataColumn dc = new DataColumn("albumName", typeof(string));
DataRow dr = null;
dt.Columns.Add(dc);
dr = dt.NewRow();
dr["albumName"] = "Zen Arcade";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["albumName"] = "New Day Rising";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["albumName"] = "Candy Apple Grey";
dt.Rows.Add(dr);
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
I was able to duplicate your rendering problem:
<p>Some "arbitrary" text.
<input type="submit" onclick="doConfirm('delete', 'myalbum');" value="Button" name="ctl00$MainContent$Button3" id="MainContent_Button3" />
</p>
<div>
<table cellspacing="0" rules="all" border="1" id="MainContent_GridView1"
style="border-collapse:collapse;">
<tr>
<th scope="col"> </th>
<th scope="col">Album Name</th>
<th scope="col"> </th>
<th scope="col">albumName</th>
</tr>
<tr>
<td>
<input type="submit" onclick="doConfirm("delete", "Zen Arcade");" value="Button" name="ctl00$MainContent$GridView1$ctl02$Button1" id="MainContent_GridView1_Button1_0" />
</td>
<td>Zen Arcade</td>
<td>
<input type="submit" onclick="return doConfirm('delete', 'Zen Arcade');" value="Button" name="ctl00$MainContent$GridView1$ctl02$Button2" id="MainContent_GridView1_Button2_0" />
</td>
<td>Zen Arcade</td>
</tr>
<tr>
<td>
<input type="submit" onclick="doConfirm("delete", "New Day Rising");" value="Button" name="ctl00$MainContent$GridView1$ctl03$Button1" id="MainContent_GridView1_Button1_1" />
</td>
<td>New Day Rising</td>
<td>
<input type="submit" onclick="return doConfirm('delete', 'New Day Rising');" value="Button" name="ctl00$MainContent$GridView1$ctl03$Button2" id="MainContent_GridView1_Button2_1" />
</td>
<td>New Day Rising</td>
</tr>
<tr>
<td>
<input type="submit" onclick="doConfirm("delete", "Candy Apple Grey");" value="Button" name="ctl00$MainContent$GridView1$ctl04$Button1" id="MainContent_GridView1_Button1_2" />
</td>
<td>Candy Apple Grey</td>
<td>
<input type="submit" onclick="return doConfirm('delete', 'Candy Apple Grey');" value="Button" name="ctl00$MainContent$GridView1$ctl04$Button2" id="MainContent_GridView1_Button2_2" />
</td>
<td>Candy Apple Grey</td>
</tr>
</table>
</div>
When any of the buttons were clicked, the JavaScript function ignored the HTML encoding, alerting me to:
Sikker på du vil delete: Zen Arcade
so while it looks funky in the source, having quotes and apostrophes render as " and ' doesn't really appear to affect anything.

Try the following:
<asp:Button OnClientClick="Delete(this);" Text='<%# Eval("albumName"); %>' />
JS:
function Delete(element) {
var value = element.value;
return confirm('Delete' + value + '?');
}

Just attach the event server side inside rowDataBound event like, (you can replace linkbutton with Button)
LinkButton myLinkButton=(LinkButton)e.row.FindControl("yourButtonName");
if(myLinkButton!=null)
{
myLinkButton.Attributes.Add("onclick","javascript:return confirm ('Are you sure you want to delete "+ DataBinder.Eval(e.row.DataItem, "YourDbField") + " ?');");
}

Even though this question is 5 years old, I wanted to follow up as I had the same issue with an ImageButton and was able to resolve it using a HiddenField.
Background: I have a Web User Control which I wanted to have a help button displayed if there was help available.
I added a HiddenField and an ImageButton to the User Control. I then created a property on the control so the developer may add help text.
ASPX Page
<asp:HiddenField ID="hidHelpText" runat="server" />
<asp:ImageButton ID="imgHelp" runat="server" ImageUrl="~/images/help.png" Visible="False" />
Code Behind (CS File)
public string HelpText
{
get { return hidHelpText.Value; }
set { hidHelpText.Value = value; }
}
protected void Page_Load(object sender, EventArgs e)
{
imgHelp.Visible = !string.IsNullOrEmpty(HelpText);
imgHelp.OnClientClick = string.Format("MsgBox({0}.value, MessageButtons.OK); return false;", hidHelpText.ClientID);
}
This gets around the issue as the text belongs to the hidden field instead of trying to include it within the JavaScript for the OnClientClick property.
BTW: I cannot copy and paste so this code may contain some typos but I believe it is correct. At least it points the way so you may be able to work around the issue.

Dyanamically disable validation on asp.net controls

Depending upon the responses from the user when they complete a form, controls may or may not be required. All of these controls have validation attached to them. For instance, if the user hasn't lived at their address for at least 2 years, I need to validate previous address information; if not, I need to skip that validation.
I've tried disabling the validator control with jQuery and although when the validation text is 'greyed out', it still causes validation.
<script src="../../Scripts/jquery-1.6.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#ddlSpouseData').change(
function () {
var selection = $('#<%= ddlAddressData.ClientID%>').get(0).selectedIndex;
if (selection == 1) {
alert(selection);
$('#rfvAddressType').attr('disabled', 'disabled');
$('#rfvBAddress').attr('disabled', 'disabled');
}
});
});
</script>
<table id="MyTable" class="tableModule">
<tr>
<td class="tableDataBorder">
Data is not available and<br /> will be provided later.
</td>
<td class="tableDataBorder">
<asp:DropDownList ID="ddlAddressData" runat="server">
<asp:ListItem>Please Select</asp:ListItem>
<asp:ListItem>Yes</asp:ListItem>
<asp:ListItem>No</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr class="hideRow">
<td class="tableDataBorder">
Identifying Document
</td>
<td class="tableDataBorder">
<asp:DropDownList ID="ddlAddressType" runat="server">
<asp:ListItem>Please Select</asp:ListItem>
<asp:ListItem>Home</asp:ListItem>
<asp:ListItem>Office</asp:ListItem>
<asp:ListItem>Other</asp:ListItem>
</asp:DropDownList>
<br />
<asp:RequiredFieldValidator ID="rfvAddressType" CssClass="regexError" ControlToValidate="ddlAddressType"
runat="server" ErrorMessage="Please select address type" Display="Dynamic"
InitialValue="Please Select"></asp:RequiredFieldValidator>
</td>
</tr>
<tr class="hideRow">
<td class="tableDataBorder">
Address
</td>
<td>
<asp:TextBox ID="txtAddress" MaxLength="50" runat="server" CssClass="StdTxtBox"></asp:TextBox><br />
<asp:RequiredFieldValidator ID="rfvBAddress" CssClass="regexError" ControlToValidate="txtAddress"
runat="server" ErrorMessage="Please enter your address" Display="Dynamic"></asp:RequiredFieldValidator>
</td>
</tr>
</table>

Instead of your RequiredFieldValidator, use a CustomValidator instead.
So for example you can change your 'rfvAddressType' requiredfieldvalidator as follows:
<asp:CustomValidator runat="server"
id="valAddressType"
controltovalidate="ddlAddressType"
onservervalidate="cusCustom_ServerValidate"
errormessage="Please select address type" />
Then on the server code:
protected void cusCustom_ServerValidate(object sender, ServerValidateEventArgs e)
{
if (ddlAddressType.SelectedItem.Value == "1")
e.IsValid = false; // or do any additional validation checks here!
else
e.IsValid = true;
}
More details here:
http://asp.net-tutorials.com/validation/custom-validator/
https://web.archive.org/web/20211020145934/https://www.4guysfromrolla.com/articles/073102-1.aspx

Try disabling or enabling validators on the run to achieve your desired functionality. You can try this code. I haven't tested it.
//Syntax:
ValidatorEnable(ValidatorContronName,Boolean);
//Explanation:ValidatorContronName - This is ClientID of the Validation control.
Boolean - true(Enable) / false(Disable)
//Example:
ValidatorEnable(document.getElementById('<%=rfvAddressType.ClientID%>'), false);

Want Checked Item From Listview

I am working with listview in C# webapplication. My Problem is I want checked Items from the listview . I have try with find selecteditem and all. I dont know how to get checked items from checkbox inside listview.My code is as follows:-
aspx
<asp:ListView ID="PackagesListView" runat="server" DataSourceID="PackagesDataSource" ItemPlaceholderID="itemPlaceholder"
GroupItemCount="4" GroupPlaceholderID="groupPlaceholder" OnItemDataBound="PackagesListView_ItemDataBound">
<LayoutTemplate>
<table style="margin-left:0px; width:570; table-layout:fixed; overflow:hidden;">
<tr ID="groupPlaceholder" runat="server" >
</tr>
</table>
</LayoutTemplate>
<GroupTemplate>
<tr class="productsTableRow">
<td ID="itemPlaceholder" runat="server"></td>
</tr>
</GroupTemplate>
<ItemTemplate>
<td style="width:140px;">
<div style="text-align:center; line-height:1.5;"><asp:Label ID="PackageLabel" runat="server" Text='<%#Eval("Name")%>' /></div>
<div style="text-align:center;"><asp:CheckBox ID="PackageCheckBox" runat="server" OnCheckedChanged="OnPackageSelected" AutoPostBack="true" PackageID='<%#Eval("PackageID")%>' /></div>
</td>
</ItemTemplate>
</asp:ListView>
<asp:Button ID="ButtonSaveQuotation" runat="server" Text="Save Quotation"
CssClass="button" Visible="false" onclick="ButtonSaveQuotation_Click1" />
aspx.cs
protected void ButtonSaveQuotation_Click1(object sender, EventArgs e)
{
StringBuilder sb = new StringBuilder();
}
so here in sb I want to append text of all the label whose checkboxes are checked.Thank You

You will have to find the checkbox since it's inside the template field
Example:
if (PackagesListView.Items.Count > 0)
{
for (int i = 0; i < PackagesListView.Items.Count; i++)
{
CheckBox PackageCheckBox= (CheckBox)PackagesListView.Items[i].FindControl("PackageCheckBox");
if (PackageCheckBox!= null)
{
if (PackageCheckBox.Checked.Equals(true))
{
//do your stuff here
}
}
}
}

foreach (var item in PackagesListView.Items.Where(i => ((CheckBox)i.FindControl("PackageCheckBox")).Checked))
{
var label =(Label) item.FindControl("PackageLabel");
label.Text += " Appended text";
}
Perhaps this will help you? This should go after page load. Also make sure you are not rebinding your listview.

var texts = PackagesListView.Items.Cast<Control>()
.Where(c => ((CheckBox)c.FindControl("PackageCheckBox")).Checked)
.Select(c => ((Label)c.FindControl("PackageLabel")).Text);
var sb = new StringBuilder();
foreach ( var text in texts)
sb.AppendLine(text);