Forms Data Controls :: PlaceHolder Contents Not Shown After PostBack
Oct 5, 2010
I have a GridView control which contains a custom <pagertemplate> with a <asp:PlaceHolder runat="server" ID="plcPages"> control. The .aspx.cs file contains the following code:
protected void Page_Load(object sender, EventArgs e) {
... {Other Code} ...
GridViewRow pagerRow = GridView1.BottomPagerRow;
PlaceHolder PagePlc = (PlaceHolder)pagerRow.Cells[0].FindControl("plcPages");
Button btnPage;
int iPageNum;
for (int i = 0; i < GridView1.PageCount; i++) { iPageNum = i + 1;
btnPage = new Button(); btnPage.ID = "btnPage" + iPageNum.ToString();
btnPage.CommandName = "Page"; btnPage.CommandArgument = iPageNum.ToString();
btnPage.Text = " " + iPageNum.ToString() + " ";
PagePlc.Controls.Add(btnPage); } }
Everything works fine the first time the page is displayed. But, when I click any pager button, including the Next and Prev command buttons that are not part of the PlaceHolder, the contents of the PlaceHolder are never re-displayed. I know from searching other posts that the PlaceHolder contents are lost during the trip to the server, but I am already recreating them every time the page is loaded. They are just never being shown again. I've spent the last two days playing with ViewState And every other combination.
I need to be able to check programatically if a SqlDataSource contains no rows, and make a Placeholder visible if it does contain rows, and invisible if it doesn't. I seem to be able to return the affected rows using SqlDataSource1_Selected, but turning the placeholder invisible never works.
turning the placeholder off and on depending on whether the data source contains rows?
I have a gridviewto which I have added a templatefield based column. In that template field there is a placeholder. I am adding either a textbox or a radiobuttonlist to that placeholder programmatically.
So the problem is that when the page compiles, the contents of the placeholder get tabulated. So each listitem of the radiobuttonlist is encapsulated by its own <td> and <tr>
Now I seriously would not want the items of my radiobuttonlist to get separated as I am using the jQuery UI to style them. Not that they are not getting styled, but not the way should be.
Following is my .aspx code that creates the CPL:
[Code]....
Following is my .cs code :
[Code]....
Following is the resultant compiled code. It is inside the <td> of the parent gridview:
I am using list view to display the the data but i am getting an error like An item placeholder must be specified on ListView 'ListView1'. Specify an item placeholder by setting a control's ID property to "itemPlaceholder". The item placeholder control must also specify runat="server.Even i have specified the itemplaceholder id but no use still same error.
I am using this code to fill my datalist: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim myConnection As SqlConnection Dim myCommand As SqlDataAdapter myConnection = New SqlConnection("mydb") myCommand = New SqlDataAdapter("SELECT * FROM Posts", myConnection) Dim ds As DataSet = New DataSet() myCommand.Fill(ds) DataList1.DataSource = ds DataList1.DataBind() End Sub
It works and fills the datalist with the whole table. When this page opens the address bar is like [URL].Ii would like the datalist to show all contents in the table with this specific thread ID.
when I hover over a menu option it's contents are shown above instead of the Bottom off. Even though the hover control says bottom. In my browser and others it works fine, I use IE8. But some browsers it's goes wrong.
how to maintain state of placeholder. i have a placeholder in which i add many image controls dynamically but when my page get refresh all controls from placeholder gets removed from it. the enableViewstate of placeholder is set to true.
in this code: we are saying that if there is budget data show visibilty on all columns, if there is not budget data only show one column. i would like to add one new thing. If there is budget data and the hide button is pressed then show also col, 4.now if there is never budget data only show co2. this is different than what we have. how can i add this extra logic step?
I have a Repeater who should show some data from my ms.sql server. But all code inside the Repater is not shown on my .aspx page. What am i doing wrong. I have a similar Repeater on another page and there it works fine.
I am having an issue with Listview controll ,It does not show all string ( string could be 50 words), is there a way around this ,I also have ,one item of listview want to be displayed as hyperlinks .
simple code
this is a part of function that call the listview function
I have a ListView control that only displays one record at a time. I have a LinqDataSource that can return one or more records. I have a function that determines the number of records and returns a psuedo random number between 1 and the number of records returned. When the page first loads, I want to display a random record. After that, I want the datapager to move the user normally through the records.
In my Page Load Event, if Page.IsPostBack is false, I get the random number. Let's say for simplicity I have 15 records and the randon number generated is 6. How do I tell the LinqDataSource to display the record at index 6?
I have a web form, and an "add vendor" button. Click the button, a modal dialog pops up (ajax:ModalPopupExtender). User selects one of two radio buttons which shows a data bound asp:View in an update panel - this view is data bound to a single row and must be populated by the user. However I also want to provide a cancel button which should close the modal dialog and reset the bound view.
However what is happening is that the ModalExtender closes, but when the "add vendor" button is presented again, it's still bound to the same data. Do I need to clear my data source? How so I reset the forms/views so that when the 'add vendor' button is clicked again the form is presented as it should be (IE the 2 select options, picking one re-binds the asp:View)?
I have a Placeholder in which I added a Hyperlink (the hyperlink is an attachment in messaging application) how do I get the hyperlink to go hot when the user put there mouse over it:
I have a GridView where the user can choose an occasion, and I want to show the occasion date in a calendar. How should I convert the date string from the GridView? The code below works except for the rows concerning Date and calendar:
guide how I can sort grid data when header is not shown. Actually In my page I have set visibility of header to false and have placed headings in table above the grid (it was done because requirment was to fix header and make grid with scrollable).how I can give sorting functionality with headings in table above the grid
I'm using VWD with a database back end. I have a list of teams which are marked off by league, level, division, teamid and then using gridview for the list of players per teams.I've got the drop downs working correctly but running into a little snag and that is on the auto postback.When I only have one option come up in a list, i obviously don't change that list and thus it doesn't change the next drop down because there is no post back. is there a way to use a "header" value?
I have to display data in following format in asp.net. Please suggest me the best suited control for the same. Any help with code, rather than just the control names
I have created a really simple custom control to render panels into a page. The code is below. When I use my control and add any webcontrol to it, after each page postback the contents of these child controls vanishes.
I must have missed something really simple but run the example to reproduce this. Can anyone please enlighten me as to why the controls are being 'emptied' of their contents, and how I stop this occuring?
I have a formview that has several dropdownlists in the EditItemTemplate. Some of the dropdownlists are added using placeholders. I can add and populate their listitems without any problem. But when I update the record, none of the controls can be found--even though when I look at the page source they are there. I first strated out using asp:ControlParameter in my sqldatasource updateparameters, but even referencing the control as myform$mycontrol did nothing. So then I moved to code behind on the sqldatasource.updating event (code is attached). The only controls I cannot seem to bind to the update are those added via the placeholder.
[Code]....
The item at the dim statement is not an item added using a placeholder and does not get a null reference exception (I used that to prove during debbugging that I wasn't losing my mind)--however, all the items being used to get the parameter values are getting null reference exceptions and are added via placeholders. Here is the code I'm using to set up the dropdownlists:
[Code]....
how to get the value of these controls so they can be used in my update?
