I have been searching around and I am lost on how to do what I am attempting to do.
I am trying to create a form where the first column is a list of names, and the next column is all dropdown lists. The idea is that for each name the user will pic a value. Each name may require two, or three or more values. I want to create a dynamic form where a user can click add in the row and another dropdown list appears.
Ex.
"Name" | Add Button | DropDown
then when I click add...
"Name" | Add Button | DropDown | DropDown
and have it keep going.
I am able to create the form and I have it working creating the dropdown lists. The problem is that I am adding the controls on the ItemCommand of a repeater, so they must be recreated every time. Because of this I cannot find a way to keep the values selected in each dropdown, when I have to recreate them.
Typically no more than two dropdowns are required but there are a few cases where three is needed, and it could arise for more. I would like to keep this dynamic as possible.
I know that if I added the dropdown's in the page Init they would be persisted on the postback, but at least in my design the user has to click add to get another drop down.
Is there a way to capture the data from these dropdowns then reload them every time? Or a better way to achieve this functionality?
Thank You for your help.
Here is some of the asp and code behind that I am using. This is functioning as I wish, but I don't know how to keep the data on a postback, as all of the dropdown lists I add are lost.
ASP:
<table>
<asp:Repeater ID="repChemicals" runat="server" OnItemCommand="repChemicals_OnItemCommand">
<ItemTemplate>
<tr>
<td>
<asp:HiddenField ID="hfNumber" runat="server" />
<%# Eval("ChemicalName") %>
</td>
<td>
<asp:Button runat="server" ID="btnAdd" Text="Add" CommandArgument="ADD" />
</td>
<td>
<div id="divContainer" runat="server">
<asp:DropDownList runat="server" Width="60px" ID="ddlTest"></asp:DropDownList>
</div>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>
C#:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
List<Chem> Chemicals = new List<Chem>();
Random rnd = new Random();
for (int z = 0; z <= 10; z++)
{
List<string> t = new List<string>();
Chem a = new Chem()
{
ChemicalName = "Chemical" + z.ToString()
};
Chemicals.Add(a);
}
repChemicals.DataSource = Chemicals;
repChemicals.DataBind();
}
}
public void repChemicals_OnItemCommand(object sender, RepeaterCommandEventArgs e)
{
int number = 0;
foreach (RepeaterItem i in repChemicals.Items)
{
HiddenField hf = (HiddenField)repChemicals.Items[i.ItemIndex].FindControl("hfNumber");
if (i.ItemIndex == e.Item.ItemIndex)
{
if (!string.IsNullOrWhiteSpace(hf.Value))
{
number = Convert.ToInt16(hf.Value) + 1;
}
else
{
number = 1;
}
hf.Value = number.ToString();
}
else
{
if (!string.IsNullOrWhiteSpace(hf.Value))
{
number = Convert.ToInt16(hf.Value);
}
else
{
number = 0;
}
}
for (int x = 0; x < number; x++)
{
DropDownList ddl = new DropDownList();
ddl.Style.Add("width", "60px");
ddl.ID = "ddl" + i.ToString() + x.ToString();
ddl.Style.Add("Margin-right", "3px");
ddl.Attributes.Add("runat", "server");
ddl.DataSource = DataSource();
ddl.DataBind();
Control c = repChemicals.Items[i.ItemIndex].FindControl("divContainer");
c.Controls.Add(ddl);
}
}
Some of the loops are for creating test data. Basically I am storing a number of dynamic controls on each row in a hiddenfield. Then on the item command I loop through all of the rows and recreate all of the previously existing ddl's, and add one to the row that teh command came from.
This isn't exactly answering your question, but it accomplishes your ultimate goal in a less complex way and one that takes advantage of built in ASP.NET controls so maintaining state between postbacks is taken care of for you.
It utilizes jQuery, jQuery UI and a DropDownChecklist plugin.
ASPX
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.min.js"></script>
<script type="text/javascript" src="js/ui.dropdownchecklist.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/themes/base/jquery-ui.css"/>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<asp:Repeater ID="repChemicals" runat="server">
<ItemTemplate>
<tr>
<td>
<%# Container.DataItem %>
</td>
<td>
<div id="divContainer" runat="server">
<asp:ListBox ID="lstAttributes" SelectionMode="Multiple" runat="server"></asp:ListBox>
</div>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>
<asp:Button ID="btnPostback" Text="Postback" runat="server"/>
</div>
</form>
</body>
</html>
C#
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace PersonAttributes
{
public partial class People : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
repChemicals.ItemCreated += RepChemicalsOnItemCreated;
var chemicals = new[] {"Hydrogen", "Helium", "Lithium", "Beryllium", "Boron"};
if(!IsPostBack)
{
repChemicals.DataSource = chemicals;
repChemicals.DataBind();
}
var dropDownChecklist = "$(document).ready(function () { $('select').dropdownchecklist(); });";
ScriptManager.RegisterStartupScript(this,GetType(),"initDropDownChecklist",dropDownChecklist,true);
}
private void RepChemicalsOnItemCreated(object sender, RepeaterItemEventArgs repeaterItemEventArgs)
{
var lst = repeaterItemEventArgs.Item.FindControl("lstAttributes") as ListBox;
if (lst == null)
return;
lst.DataSource = new[] {"Option 1", "Option 2", "Option 3"};
}
}
}
See it in action at CodeRun.
Related
I want to load an aspx page having a textbox and a button beside it and with any numeric value in the textbox. On clicking the button beside the textbox I want to generate another set of textbox containing a non-repeating random number and a button beside it and this should continue again if we click the last generated button.
In my code I am getting the output but, in my output the page gets loaded and for the first time it displays a textbox containing '0' and a button but when I click on the generate button it is generating the textboxes and buttons but they are getting placed above the very first textbox containing '0' and rest of all the newly generated textboxes containing with random numbers along with buttons are placed over the first textbox. I want the first textbox to be on the top and rest of them gets generated below it.
I am new to C#, asp.net. Please Help!!!
Following is my code:
<!DOCTYPE html>
<script runat="server">
static int limit = 0;
static int[] x = new int[100];
protected void Page_Load(object sender, EventArgs e)
{
if(Page.IsPostBack)
x[limit] = new Random().Next(100);
}
protected void bGenerate_Click(object sender, EventArgs e)
{
limit++;
}
protected void tbNum_TextChanged(object sender, EventArgs e)
{
//tbNum.Text ="";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Creates Controls Dynamically</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="width:100%;">
<%
for (int counter = 0; counter <= limit; counter++)
{
%>
<tr>
<td>
<input type="text" name="tbNum" id="tbNum" value="<%=x[counter]%>"/>
<%--<asp:TextBox ID="tbNum" runat="server" Width="382px" OnTextChanged="tbNum_TextChanged"></asp:TextBox>--%>
</td>
<td>
<asp:Button ID="bGenerate" runat="server" Text="GENERATE" Width="290px" OnClick="bGenerate_Click" />
</td>
</tr>
<%
}
%>
</table>
</div>
</form>
</body>
You should move the code that generates new random values to the bGenerate_Click event:
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
x[0] = new Random().Next(100);
}
protected void bGenerate_Click(object sender, EventArgs e)
{
limit++;
x[limit] = new Random().Next(100);
}
The problem with your existing code is that when you click on the Generate button, the code in Page_Load is executed before bGenerate_Click.
I'm using the code below to create radio buttons dynamically to a webpage as each set of data is retrieved from a database by iteration. It works well. The only problem is I need these to PostBack so further data can be retrieved depending on which radio button is clicked. I tried doing this with RadioButton controls but these wouldn't position inside of a table cell like the <span> technique does and they wouldn't create through a <span>.
int count = 0;
if (dataReader.HasRows)
{
testLabel1.Text = "dataReader.HasRows: " + dataReader.HasRows;
while (dataReader.Read())
{
count += 1;
htmlString.Append("<table border = '1'>");
htmlString.Append("<tr>");
htmlString.Append("<td>");
htmlString.Append(dataReader["dateTime"] + "<br />" + "<span><input type='radio' id='rd1'/>SOMTEXT </span>" + dataReader["statistics"]");
htmlString.Append("</td>");
htmlString.Append("</tr>");
htmlString.Append("</table>");
htmlString.Append("<br />");
}
test_populatePlaceHolder.Controls.Add(new Literal { Text = htmlString.ToString() });
dataReader.Close();
dataReader.Dispose();
}
}
}
}
I tried adding runat="server" in <span><input type='radio' id='rd1'runat='server'/>SOMTEXT </span> but it didn't create the radio button. Thanks in advance.
Don't know, how to format code in comment. One more again - if you write runat="Server" in your hand-made html, it does nothing, because this code will not be compiled, you just write html answer manually. On the other hand compilation of declarative language (asp.net, razor or any other) makes javascript, you can do it manually too, but B.Gates kindly agreed to do it for you :-)
Asp.Net design
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Repeater ID="Repeater1" runat="server" >
<HeaderTemplate>
<table border ="1">
</HeaderTemplate>
<ItemTemplate>
<tr>
<td style="width:200px">
<asp:Label runat="server" ID="Label1"
/>
</td>
<td style="width:200px" >
<asp:RadioButton ID="RadioButton1" runat="server" Checked="false" Text = '<%# Eval("Text") %>' AutoPostBack ="true" />
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
</div>
</form>
</body>
</html>
C# CodeBehind
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
int num = 10;
if (Page.IsPostBack)
{
for (int i = 1; i < this.Repeater1.Controls.Count-1; i++)
{
RadioButton r = (RadioButton)this.Repeater1.Controls[i].Controls[3];
if (r.Checked)
{
num=int.Parse(r.Text.Substring(0, r.Text.IndexOf(' ')));
break;
}
}
}
this.Repeater1.DataSource = GetAll(num);
this.Repeater1.DataBind();
}
DataTable GetAll(int count)
{
Random r = new Random();
DataTable dt = new DataTable();
dt.Columns.Add("Text", typeof(string));
DateTime bs = DateTime.Now;
for (int i = 0; i < count; i++)
{
int value = r.Next(3, 10);
dt.Rows.Add(value.ToString() + " rows will be shown");
}
return dt;
}
}
Method GetAll() returns table, having count lines. In each line is text "%i rows will be shown" with random number. Table is bind to data repeater on page load event. If it is postback, number of rows is parsed from text of radiobutton inside repeater row (you can't get it from data table, it is another page, data table is already in GC)
I'm using a Repeater to show some data coming from a web service.
My Repeater structure is:
<asp:Repeater ID="rptgrp" runat="server">
<ItemTemplate>
<asp:CheckBoxList ID="chkBoxListGoup" runat="server"
DataSource='<%# DataBinder.Eval(Container.DataItem, "Titles")%>'
DataTextField="Title"
DataValueField="IDTitle">
</asp:CheckBoxList>
</ItemTemplate>
</asp:Repeater>
Now, my web service returns these fields in "Titles":
1) Title
2) IDTitle
3) isUserTitle
Now, I would like to set checked a checkbox when isUserTitle is = 1.
How can I do that?
You can find checkboxlist as follows
Find checkboxlist in itemdatabound,
check item text of every checkboxlist using loop,
select the item whose text is 1
Protected void Repeater_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
CheckBoxList chklst = (CheckBoxList)e.Item.FindControl("chkBoxListGoup");
for (int i = 0; i < chk.Items.Count; i++)
{
if (chk.Items[i].Text == "1")
{
chk.Items[i].Selected = true;
}
}
}
}
Try changing <asp:CheckBoxList ID="chkBoxListGoup" runat="server"
to
<asp:CheckBoxList ID="chkBoxListGoup" Checked='<%#Eval("Flag")%>' runat="server"
Flag being your Column..
Then in your method or event handler you want to run some code to say if this value = 1 checked, elseif value = 0 unchecked...
Here is sample code that demonstrates the idea:
Code-behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.UI.WebControls;
using WebApp.RepeaterCheckboxList.TODODatasetTableAdapters;
namespace WebApp.RepeaterCheckboxList
{
public partial class WebForm1 : System.Web.UI.Page
{
IEnumerable<TODODataset.TasksViewRow> view;
IEnumerable<TODODataset.TasksViewRow> subview;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TasksViewTableAdapter adp = new TasksViewTableAdapter();
var dt = adp.GetData();
view = dt.AsEnumerable();
var names = (from x in view
select new
{
Person = x.Name,
ID = x.PersonID
}).Distinct();
DataList1.DataSource = names;
DataList1.DataBind();
}
}
protected void CheckBoxList1_DataBound(object sender, EventArgs e)
{
CheckBoxList theList = (CheckBoxList)sender;
var person = ((DataListItem)theList.Parent).DataItem as dynamic;
var name = person.Person;
var id = person.ID;
var vw = subview;
for (int i = 0, j = vw.Count(); i < j; i++)
{
var task = vw.ElementAt(i);
theList.Items[i].Selected = task.Completed;
}
}
protected IEnumerable<TODODataset.TasksViewRow> GetTasks(object data)
{
var vw = data as dynamic;
return subview = (from x in view
where x.PersonID == vw.ID
select x);
}
}
}
Aspx:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApp.RepeaterCheckboxList.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DataList ID="DataList1" runat="server">
<ItemTemplate>
<div style="padding:5px">
<h3><%# Eval("Person") %></h3>
<div>
<asp:CheckBoxList OnDataBound="CheckBoxList1_DataBound" ID="CheckBoxList1"
runat="server"
DataTextField="TaskDesc" DataValueField="TaskID"
DataSource="<%# GetTasks(Container.DataItem) %>"></asp:CheckBoxList>
</div>
</div>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>
If you are interested in the data, click here
Try just setting the Checked value to the object being Evaled.
<asp:Repeater ID="rptgrp" runat="server">
<ItemTemplate>
<asp:CheckBoxList ID="chkBoxListGoup" runat="server"
Checked=<%# Eval("isUserTitle") %>>
</asp:CheckBoxList>
</ItemTemplate>
</asp:Repeater>
Have landed into a scenario again. The summary is as follows:
I have a user-control which is basically a mix up of a textbox,imagebuttons,checkboxlist incorporated together to look like a single-select dropdown with checkboxes..works pretty fine. One of the images inside the usercontrol opens up an aspx page as a popup.have few functionalities there viz saving values to database and stuffs.
On the OK button click of the popup page, I should be able to save the values to the DB as well as populate the usercontrol(which acts as a dropdown) with the value which I have saved to the DB.
Here the problem arises, when trying to bind the checkboxlist(present in the usercontrol) to the values from the DB, I get the error that the checkboxlist object is null and has not been created.
I feel that on the OK button click, the usercontrol has to refresh and hence the checkboxlist will be active.
PFB the relevant codes:
Usercontrol.ascx:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="SingleSelectCustomDropDown.ascx.cs" Inherits="MS.IT.Informa.UI.UserControls.SingleSelectCustomDropDown" %>
<asp:Panel ID="panel" runat="server">
<div id="FirstDiv">
<table>
<tr>
<td align="right">
<asp:TextBox ID="txtSelect" runat="server" ReadOnly="true"></asp:TextBox>
</td>
<td>
<asp:Image ID="imgShow" ImageUrl="../Images/DDGlyph.png" onmouseover="this.src='../Images/DDGlyphHOVER.png'" onmouseout="this.src='../Images/DDGlyph.png'" runat="server" />
</td>
</tr>
<tr>
<td colspan="2">
<div id="SecondDiv" style="display:none;">
<asp:CheckBoxList ID="chkBoxList" runat="server">
<asp:ListItem Value="0" Text="Standard" Selected="True"></asp:ListItem>
</asp:CheckBoxList>
</div>
<div id="ThirdDiv" style="display:none;">
<asp:ImageButton ID="btnNew" runat="server" Height="20px" ImageUrl="~/Images/new.png" Width="20px" OnClientClick="ShowPopup();" />
<asp:ImageButton ID="btnEdit" runat="server" Height="20px" ImageUrl="~/Images/edit.png" Width="20px" />
<asp:ImageButton ID="btnDefault" runat="server" Height="20px" ImageUrl="~/Images/default.png" Width="20px" />
<asp:ImageButton ID="btnDelete" runat="server" Height="20px" ImageUrl="~/Images/delete.png" Width="20px" />
</div>
</td>
</tr>
</table>
</div>
</asp:Panel>
<script type="text/javascript">
//Displays the divs containing checkboxlist and images
function ShowList() {
document.getElementById("SecondDiv").style.display = "block";
document.getElementById("ThirdDiv").style.display = "block";
}
//Hides the divs containing checkboxlist and images
function HideList() {
document.getElementById("SecondDiv").style.display = "none";
document.getElementById("ThirdDiv").style.display = "none";
}
//Displays the selected item from the checkboxlist into the textbox placed in the Custom Control
function DisplaySelectedItem(sender, txtBoxID) {
var x = document.getElementById(sender.id);
var chkBoxPrefix = sender.id + "_";
var selectedText;
for (i = 0; i < x.rows.length; i++) {
if(document.getElementById(chkBoxPrefix+i).checked)
{
selectedText = document.getElementById(chkBoxPrefix+i).parentNode.innerText;
}
}
document.getElementById(txtBoxID.id).value = selectedText;
}
//Ensures that only one item is selected from the checkboxlist
function SelectOnlyOneCheckBox(e) {
if (!e) e = window.event;
var sender = e.target || e.srcElement;
if (sender.nodeName != 'INPUT') {
return;
}
var checker = sender;
var chkBox = document.getElementById('<%= chkBoxList.ClientID %>');
var chks = chkBox.getElementsByTagName('INPUT');
for (i = 0; i < chks.length; i++) {
if (chks[i] != checker)
chks[i].checked = false;
}
}
function ShowPopup() {
window.open("ViewColumnOptions.aspx", "ViewColumnOptions", "height=300,width=600,left=300,top=150");
}
</script>
The codebehind for the usercontrol as below:
public partial class SingleSelectCustomDropDown : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
chkBoxList.Attributes.Add("onclick", "SelectOnlyOneCheckBox(event);DisplaySelectedItem(this," + txtSelect.ClientID + ");HideList();");
txtSelect.Attributes.Add("onclick", "ShowList();");
imgShow.Attributes.Add("onclick", "ShowList();");
}
}
public void PopulateOtherViews()
{
SaveReportViewFilter<ReportFilterBase> newObj = new SaveReportViewFilter<ReportFilterBase>();
ViewColumnOptions vwobj = new ViewColumnOptions();
newObj.UserName = vwobj.Page.User.Identity.Name;
SaveReportView<ReportFilterBase> obj2 = new SaveReportView<ReportFilterBase>();
DataTable dt = obj2.GetSaveReportViewFromDataBase(newObj);
chkBoxList.DataSource = dt;//chkBoxList becomes null here..we have ample data in the datatable though
chkBoxList.DataTextField = dt.Columns[0].ToString();
chkBoxList.DataValueField = dt.Columns[0].ToString();
chkBoxList.DataBind();
}
}
The function PopulateOtherViews is called on the button click of the aspx page.
Below is the code:
protected void btnOK_Click(object sender, EventArgs e)
{
if (chkSaveView.Checked)
{
if (!string.IsNullOrEmpty(txtViewName.Text))
{
//some code here to save the view name from txtViewName to the DB
SingleSelectCustomDropDown obj22 = new SingleSelectCustomDropDown();
obj22.PopulateOtherViews();
Page.ClientScript.RegisterStartupScript(this.GetType(),"close","CloseWindow();",true);
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alertEnterViewName", "alertMessage('Please enter the view name');", true);
}
}
}
Any help, suggestions, pointers will be greatly appreciated.
Regards
Anurag
In btnOK_Click you are creating a new instance of the user control and not attaching it to the page. My suggestion is:
1.Register the user control and add it to the page.
<%# Register Src="~/UserControl/SingleSelectCustomDropDown.ascx" TagPrefix="uc1" TagName="SingleSelectCustomDropDown" %>
and ...
<uc1:SingleSelectCustomDropDown runat="server" id="obj22" />
2.Now modify in code behind:
protected void btnOK_Click(object sender, EventArgs e)
{
if (chkSaveView.Checked)
{
if (!string.IsNullOrEmpty(txtViewName.Text))
{
//some code here to save the view name from txtViewName to the DB
//Do not create the control again
//SingleSelectCustomDropDown obj22 = new SingleSelectCustomDropDown();
obj22.PopulateOtherViews();
Page.ClientScript.RegisterStartupScript(this.GetType(), "close", "CloseWindow();", true);
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alertEnterViewName", "alertMessage('Please enter the view name');", true);
}
}
}
The OnSelectedIndexChanged event is not firing for my dropdown box. All forums I have looked at told me to add the AutoPostBack="true", but that didn't change the results.
HTML:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Current Time: " /><br />
<asp:Label ID="lblCurrent" runat="server" Text="Label" /><br /><br />
<asp:DropDownList ID="cboSelectedLocation" runat="server" AutoPostBack="true" OnSelectedIndexChanged="cboSelectedLocation_SelectedIndexChanged" /><br /><br />
<asp:Label ID="lblSelectedTime" runat="server" Text="Label" />
</div>
</form>
</body>
</html>
Code behind:
public partial class _Default : Page
{
string _sLocation = string.Empty;
string _sCurrentLoc = string.Empty;
TimeSpan _tsSelectedTime;
protected void Page_Load(object sender, EventArgs e)
{
AddTimeZones();
cboSelectedLocation.Focus();
lblCurrent.Text = "Currently in " + _sCurrentLoc + Environment.NewLine + DateTime.Now;
lblSelectedTime.Text = _sLocation + ":" + Environment.NewLine + DateTime.UtcNow.Add(_tsSelectedTime);
}
//adds all timezone displaynames to combobox
//defaults combo location to seoul, South Korea
//defaults current location to current location
private void AddTimeZones()
{
foreach(TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones())
{
string s = tz.DisplayName;
cboSelectedLocation.Items.Add(s);
if (tz.StandardName == "Korea Standard Time") cboSelectedLocation.Text = s;
if (tz.StandardName == System.TimeZone.CurrentTimeZone.StandardName) _sCurrentLoc = tz.StandardName;
}
}
//changes timezone name and time depending on what is selected in the cbobox.
protected void cboSelectedLocation_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones())
{
if (cboSelectedLocation.Text == tz.DisplayName)
{
_sLocation = tz.StandardName;
_tsSelectedTime = tz.GetUtcOffset(DateTime.UtcNow);
}
}
}
}
Any advice into what to look at for a rookie asp coder?
EDIT: added more code behind
Graham Clark was correct in needing the !Page.IsPostBack, but it is now something with the global variables that I set. This code was dragged and dropped from a c# project, so I assume there is some issues with global variables and asp.net. Time for me to do more research on this to understand how global variables differ in a standalone as opposed to a web program.
Are you databinding your drop-down list every trip back to the server, or just on a postback? If you're doing it every time, it could be that the server doesn't think anything has been selected, therefore the event won't fire.
Say you're databinding the drop-down in the Page_Load event. You want to do it like this:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
// bind drop-down list here
}
}