|
Hi there.
I have a user control and a dynamically created dropdownlist on it. When I select an item in the ddl data is supposed to go into a textbox. The problem is that the SelectedIndexChanged event is only fired the second time I select some item in the ddl.
I think the problem has something to do with the viewstate - it's like the event isn't registered in the viewstate the first time I load the user control??
Here is my code which is in the Page_Load function in the user control:
DropDownList cboBUNK = new DropDownList();
cboBUNK.ID = "m_cboBUNK";
cboBUNK.CssClass = "controlText";
cboBUNK.AutoPostBack = true;
cboBUNK.SelectedIndexChanged += new EventHandler( onCboBUNKSelectedIndexChanged );
....
cboBUNK.DataSource = colBunkanr;
cboBUNK.DataTextField = "BUNK";
cboBUNK.DataValueField = "BUNK";
cboBUNK.DataBind();
cboBUNK.SelectedIndex = 0;
....
m_plhBUNK.Controls.Add( cboBUNK );
|
|
|
|
|
Do you add the user control to the web page dynamically or statically? Basically, the event gets fired based on the comparison of the current selected item persisted in the ViewState with the new posted value. IMO you may not need to set the SelectedIndex in the method. Also you may consider adding the dynamic control in the Page_Init other than the Page_Load.
|
|
|
|
|
Thanx 4 answering.
The user ctrl is added to the web page dynamically. I have 3 radio buttons on the page: Create, Edit and Delete.
> If the user chooses Create the placeholder in the user ctrl will contain a textbox control.
> If the user chooses Edit or Delete the placeholder in the user ctrl will contain a dropdownlist control with all the items he can change/delete. And it's that ddl that wont fire onSelectedIndexChanged event for the first time I pick something in it.
I commented out the set of the SelectedIndex and moved the code which adds the textbox/dropdownlist to the placeholder in the OnInit function but it made no difference 
Other suggestions?
P.S. IMO? 
|
|
|
|
|
I guess that you dynamically add the user control to the web page on postback after the ViewState is loaded. IMO, you can do that in a simpler way:
+ In the user control, you can simply declare two controls textbox and dropdownlist, and depending on which action is taken by the user, you can make the textbox/dropdownlist visible/invisible.
+ In the web page, if you dynamically load the web user control, you can add it in the Page_Init, and depending on which radio button is selected, you can set a public property in the web user control which in turn controls the visibility of the TextBox and dropdownlist. Even simpler, you can declare the web user control right in the web page instead of dynamically loading it.
|
|
|
|
|
+ In the user control, you can simply declare two controls textbox and dropdownlist, and depending on which action is taken by the user, you can make the textbox/dropdownlist visible/invisible.
> Yeah, I thought of that... changed the code but it doesn't solve the problem - for the first 2 times the first item in the ddl remains selected (the SelectedItemChanged isn't called the first time the user picks another item).
+ In the web page, if you dynamically load the web user control, you can add it in the Page_Init, and depending on which radio button is selected, you can set a public property in the web user control which in turn controls the visibility of the TextBox and dropdownlist.
> Tried that one but then if I select something different in the ddl which is in it the first item is always selected.
+ Even simpler, you can declare the web user control right in the web page instead of dynamically loading it.
> No can do. I have about 50 user controls to choose from which depends on a dropdownlist (beside the radio buttons).. and each of the user controls is dependant on the radio buttons I mentioned above.
I guess that you dynamically add the user control to the web page on postback after the ViewState is loaded. IMO, you can do that in a simpler way:
> I have an event handler for each of the three radio buttons and in them I load the right user control and they determine if the textbox or ddl is visible or not. According to .NET event-handling code is always run after the viewstate is loaded, so yeah.
The problem remains unresolved... but thanx for answering..
|
|
|
|
|
--------Web User Control sample code -----------
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="SampleWeb1.WebUserControl1" %>
<asp:TextBox ID="TextBox1" runat="server" Visible="true"></asp:TextBox>
<br />
<asp:DropDownList ID="DropDownList1" runat="server" Visible="false" AutoPostBack="True" On_SelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Text="Item1" Value="Item1" Selected="True"></asp:ListItem>
<asp:ListItem Text="Item2" Value="Item2" ></asp:ListItem>
<asp:ListItem Text="Item3" Value="Item3" ></asp:ListItem>
<asp:ListItem Text="Item4" Value="Item4" ></asp:ListItem>
</asp:DropDownList>
namespace SampleWeb1
{
public partial class WebUserControl1 : UserControl
{
public string Action
{
get
{
if (ViewState["Action"] == null)
ViewState["Action"] = "Create";
return (string)ViewState["Action"];
}
set
{
ViewState["Action"] = value;
SetControlVisibility();
}
}
protected void Page_Load(object sender, EventArgs e)
{
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
SetControlVisibility();
}
private void SetControlVisibility()
{
TextBox1.Visible = (Action == "Create");
DropDownList1.Visible = !TextBox1.Visible;
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Write(string.Format("New selected value: {0}<br/>", DropDownList1.SelectedValue));
}
}
}
--------Testing web page -------------
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="SampleWeb1._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">
<asp:RadioButtonList runat="server" ID="rdoActionList" AutoPostBack="True" On_SelectedIndexChanged="rdoActionList_SelectedIndexChanged">
<asp:ListItem Text="Create" Value="Create"></asp:ListItem>
<asp:ListItem Text="Edit" Value="Edit"></asp:ListItem>
<asp:ListItem Text="Delete" Value="Delete"></asp:ListItem>
</asp:RadioButtonList>
<asp:PlaceHolder runat="server" ID="PlaceHolder1">
</asp:PlaceHolder>
</form>
</body>
</html>
namespace SampleWeb1
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
private string CurrentControlUrl
{
get
{
if (ViewState["CurrentControlUrl"] == null)
return string.Empty;
return (string)ViewState["CurrentControlUrl"];
}
set
{
ViewState["CurrentControlUrl"] = value;
}
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
if (!string.IsNullOrEmpty(CurrentControlUrl))
{
WebUserControl1 control = (WebUserControl1)LoadControl(CurrentControlUrl);
control.ID = "WebUserControl1";
PlaceHolder1.Controls.Add(control);
}
}
protected void rdoActionList_SelectedIndexChanged(object sender, EventArgs e)
{
//Persist the dynamic user control to reload it on postback.
CurrentControlUrl = "WebUserControl1.ascx";
WebUserControl1 control = (WebUserControl1)LoadControl(CurrentControlUrl);
//Explicitly specify the id of the control.
control.ID = "WebUserControl1";
PlaceHolder1.Controls.Clear();
PlaceHolder1.Controls.Add(control);
control.Action = rdoActionList.SelectedValue;
}
}
} Last modified: Thursday, July 27, 2006 12:16:05 AM --
|
|
|
|
|
Halleluja!
The ID did the trick - just had to add it to the user ctrl whenever I loaded it.
Thank you very very very much for the help 
|
|
|
|
|
hi
i'm facing a weird situation..i hav uploaded all my project on the client server.
but RequirdField Validator,Compare Validator and RegularExperssion is not working on server..but they are working fine on local host.
how is it possible and what to do slove it.
on server no validator control is working
thanx
|
|
|
|
|
Try this....
upload a copy of WebUIValidation.js to a directory
within your application.
Add the following line to your web.config
<webControls clientScriptsLocation="YourApp/YourScriptsDirectory/" />
hope this work
Nav.
|
|
|
|
|
I am using .NET 2.0 C#. How do I sort the data in a gridiew.
I constructed the data manually. Is there any sample or link?
thanks in advance. Much appreciated.
|
|
|
|
|
You need to sort it before binding to the grid. How to sort it depends on what structure it is in.
|
|
|
|
|
|
Good Day !
Did anyone know how to pass a whole data from one .aspx page to another .aspx page? Can anyone give me a sample code or solution. Thanks..
Best Regards,
Pei Sun
|
|
|
|
|
You can paas the data from one page to another page in multiple way. One simple way is to pass it through querystring. Here your data will be there with the URL and in the next page you can retrive the data from the querystring.
Best Regards,
Apurva Kaushal
|
|
|
|
|
can you give me sample code as a reference?
Best Regards,
Pei Sun
|
|
|
|
|
What you need to do is when you are redirecting to another page the you have to pass the value with the URL like this:
Response.Redirect("page2.aspx?ID=1234");
And in page2 you can access the value of ID like this:
string str = Request.QueryStering["ID"].ToString();
Best Regards,
Apurva Kaushal
|
|
|
|
|
Response.Redirect("page2.aspx?ID=1234");
What is the meaning of the ID=1234? The ID is declare by us? The coding is just simple like this? Do you have any reference site talk about this problem? Thanks..
Best Regards,
Pei Sun
|
|
|
|
|
here id is a variable in which you are storing the value. whatever value you will store in that you can access it in the next page. And also if you are sending the value through querystring then it will be visible to the user so important data should not be sent through querystring. alternatively you can use session for this purpose.
Best Regards,
Apurva Kaushal
|
|
|
|
|
hi apurva
sorry yaar i may be disturbing u
but plz try to solve my problem.
i'm facing a weird situation..i hav uploaded all my project on the client server.
but RequirdField Validator,Compare Validator and RegularExperssion is not working on server..but they are working fine on local host.
how is it possible and what to do slove it.
on server no validator control is working
thanx
|
|
|
|
|
What you check is javascript files on the server. particularly this file "WebUIValidation" this is required for the validation controls.
Best Regards,
Apurva Kaushal
|
|
|
|
|
hello apurva
thanx..for replying
i got u but problem with me is that i'm working for a US client then how could i do changes in his server or what i hav to do for it.
and what should i ask to client for this matter.
tell me.
thanx
|
|
|
|
|
i dont think that you can do any change on there server but you need to know about the folder and i not too sure about how you can check it on there server. Alternatively you can discuss this your senioy on how to handle this.
Best Regards,
Apurva Kaushal
|
|
|
|
|
There is alot of method to go about it. And it is even better if you are using the current .NET 2.0 with the postbackurl property.
thanks in advance. Much appreciated.
|
|
|
|
|
But i'm using .Net 1.1 is there any other solution or sample code you can show to me? Thanks..
Best Regards,
Pei Sun
|
|
|
|
|
To pass data in-between forms, u have several options. To get a proper overview, search for state management in MSDN.
For immediate help:
string name = "Pei Sun";
Arraylist nickNames = new Arraylist(3);
nickNames.Add("PeSun");
DataSet ds = new DataSet();
//1. You can use HttpCookie which represents a cookie stored on the client's machine.
HttpCookie myData = new HttpCookie("CookieName");
myData.Expires.AddMinutes(5);
myData.Values.Add("name", name);
myData.Values.Add("nickNames", nickNames);
//add ds in the same way.
//Then add the cookie to the HttpSession.Cookies collection
HttpSession.Cookies.Add(myData);
//And thats it. You can redirect to your new page.
Live in fragments no longer. Only connect.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
