Forms Data Controls :: Datalist Saving User Checkboxes?
Apr 15, 2010
I'm getting an error message: Object reference not set to an instance of an object.
Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error: [Code]....
I am trying to bind my dataset to a datalist. I know I can use a databind methed but Im also trying to do something else like modifying the dataset. What I want basically done is, if the user is not signed in, it will populate my datalist which is mostly checkboxes with texts. But when the user is signed in, i want his history of his checkboxes that was save onto the database.
[Code]....
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Jul 8, 2010
save the Mulitple checkboxes in Gridview in once. I want to save only those rows which are checked.. not the once which are not checked. There is a row in gridview which has four checkboxes in each row, so i want to save the row in which either or all of the checkboxes are checked and ignore the once in which anyof checkbox is not checked.
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Feb 21, 2011
In a datalist i've got a checkbox with a autopostback.
But there is an error if i run it:
System.InvalidCastException: Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.CheckBox'.
There are 40 checkboxes, if the person selects 1 i need to deselect all others. Very easy, but how to use correct coding for it?
protected void chkWerkblad_OnCheckedChanged(object source, EventArgs e)
{
CheckBox s = source as CheckBox;
if (s.Checked)
{
foreach (CheckBox c in s.NamingContainer.Controls)
{
if(c !=null)
c.Checked = true;
}
}
}
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Jun 24, 2010
I have a test page that I am trying to add a custom control (articleWUC.ascx) and set its properties to some results from SQL. I followed several guides including this [URL] with no luck.
My test page includes two data lists one that works without dynamic creation via custom templates and the other using custom templates.
Test.Aspx.CS
[Code]....
Test.aspx
[Code]....
articleWUC.ascx.CS
[Code]....
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Jan 6, 2010
I have the follow code (i just listed the parts that might be the more important to understand my problem):
(Code Behind)
[Code]....
(Page .ascx)
[Code]....
The user control RatingControl shows the rating and the number of rates, the user control Pager is responsible for raising CurrentPageChanged when the page changes and BindData() is a function
that binds data to the Datalist control.
When the page is loaded for the first time BindData() marked with ** is executed , thereafter i only want to load data when the event CurrenPageChanged raises.
So far so good, but the problem is when the CurrentPageChanged is raised and call the BindData() function, the user controls are not loaded properly, and things that i can't understand happen, like the user controls not receiving the properties initialized when they are loaded, but the other controls inside the Datalist like lblDescription are loaded correctly with their data.
Summarizing, the user controls are not loaded correctly in this particular case when the DataBind() is called by an event.
I already searched in the internet, and i read about page life cycle, user controls and i still didn't understand why this happens and how to fix it.
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May 15, 2010
I'm having a bit of a problem with this code.
The program gives me a list of checkboxes but a user ID. then u user can change his selection and push the save button (id="btnSaveUserIntersts") and i am trying to save in the hidden textbox all the values of the checkboxes that was choosen.
The problem is that i am getting all the time the same selections that came form the database and not getting the new selection that the user made.
what am i doing wrong here?
[code]...
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Feb 24, 2011
I have DataList control and I want to assign to it's edititemtemplate some User Control. The problem is I can't find when I should databound UserControl to data, as my UserControl doesn't have static look (it renders different depending on some property values and datasource).
I was try to simply set my user control in edititemtemplate
<EditItemTemplate>
<uc:MyUserControl id="myUserControl1" runat="server" />
</EditItemTemplate>
and then bind it to data in ItemDataBound event handler, but it remains empty
if(e.Item.ItemType == ListItemType.EditItem)
{
var p = (Pair)DataBinder.GetPropertyValue(e.Item.DataItem, "Key");
((AnnouncementUserControl) e.Item.FindControl("userControl1")).RepeaterDataSource =
_templateWorker.ReturnTemplateByAnnouncementId(Convert.ToInt32(p.First), true);
}
how can I databound my control, or another approach which will make me avoid this problem?
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Jan 2, 2011
I have 2 nested datalist that one of them is menudatalist and the other is submenu datalist. whenever I click on my submenu items a dynamic user control should load in dynamic tab. my problem is : one of my usercontrols that is JQGRID does not load in tab and when I click on that submenu Item an empty tab is created,however other user controls are loaded in tabs correctly.would somebody please help me to solve this problem?
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Dec 23, 2010
I have a datalist that loops thru cart items. Within the datalist template I call a user control that has a small form that gets repeated for each item. When this control is called outside of the datalist, the form submits fine, but when called within the datalist the button has no event action. I've tried adding an event handler to ItemDataBound of the datalist, but still no event action. How can I get my form to submit?
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Nov 15, 2010
The problem is that i have a search page. Access Database holding the information. I have a Access Datasource on the page with a Datalist to show the data. I need to find a way on setting it up to says "Sorry no results found" when the is no results. i am unsure on how to do this though.
Below is my datasource and datalist
[Code]....
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Mar 16, 2011
Am building a Form for out intranet that runs on ASP.NET and C#, it is to be a survey from a SQL database. I have the connections setup can pull informations/Questions from the database. I am having a problem with setting up radio buttons within a datalist, ive never done this and i know they require unque names.
It is to be 4 radio buttons per question where only one can be select, i know how to group just not via a datalist with unique names
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Jun 4, 2010
How can I do paging with datalist if that datalist is populated with inputs coming from a querystring?
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Aug 30, 2010
I need to find which Selected Key value that was selected in the ChildDatalist inside the MainDatalist
this is my Html code...for the MainDataList and the nested Childdatalist
[Code]....
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Mar 14, 2011
I am trying to place a datalist inside datalist. I managed to place a datalist inside gridview but not datalist inside datalist.
Below is the code I am using to bind the datalist into the master gridview, I am trying to change this code in such way it will be right for datalist inside datalist but so far I did not succeed.
[Code]....
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Aug 16, 2010
i have a datalist . that is contains 7 columns in repeat layout .when i have more from 7 columns , datalist style is normal .but when i have smaller than 7 columns ! data list style is not normal,
because there are some empty columns without specific schema.
How i can make a datalist > when i have 1 columns in my datalist my first layout width be 100% ;
and dont show some empty layout ?
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May 7, 2015
how do i give the individual total time?
Means if i have a person name asim which is working on project and on same project he start n stop time (2 time) so how can i calculate the total time of only that person on that particular project ?
This is my asp.net code
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Jan 28, 2014
How do I give the individual total time?
Means if i have a person name asim which is working on project and on same project he start n stop time (2 time) so how can i calculate the total time of only that person on that particular project ?
This is my asp.net code
<ItemTemplate>
<strong>Name:</strong>
<asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>' />
<br />
<br />
<strong> JobNumber:</strong>
<asp:Label ID="JobNumberLabel" runat="server" Text='<%# Eval("JobNumber") %>' />
[Code] .....
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Jan 18, 2011
I've been using this programming style, that I've seen in an example and just started using it, because it does the job... I would like to know other programmers' opinion about it...
So the situation is when you have a GridView, or a control based on it like the RadGrid, and you want to keep track of a data table while you are adding, editing, reordering and deleting rows.
Using the session to hold the data table (or list of data) may not be the best solution, because the user may open two identical web pages... Using the ViewState to hold the data may be and option... I have been using an approach like the following:
[code]....
So using a static List variable, of a custom object (class), declared in the code-behind of the Aspx page, and updating it whenever the data is edited.
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Oct 22, 2010
I have a gridview and now I need to add a column with checkboxes.
The checkboxes need to be checked or unchecked depending on the data retrieved.
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Jul 14, 2010
have a gridview with a bunch of checkboxes. I would like to restrict the selection based on a value I get back from the database. I am able to do this on the serverside but it is very cluncky. Is there a way I could do that using javascript and ajax or just a more elegant way to approach this. The gridview is in a usercontrolMy code right now -
[Code]....
My selectioncount code is as follows - Protected Sub selectionCount(ByVal sender As Object, ByVal e As EventArgs)
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Dec 3, 2010
I am running into a problem getting a value from my Grid View based on the selected checkbox. I have a grid view that is populated by database based on search criteria. However once that Grid View is populated, I would like to be able to select multiple ID's from that view. My coding experience isnt the greatest as I am still fairly new to all of this.
<asp:GridView ID="GridView1" runat="server" DataSourceID="ObjectDataSource1"
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Feb 16, 2011
I am trying to implement a gridview with some checkboxes to allow users to select the rows that they would like to insert into a file selected from a dropdown list. am working on being able to select the rows from the grid but not having much success. I can get it to recognise each selected row but when I place them in a dataset it only stores the last checked gridrow. It's probably something simple that I'm missing y code is
protected
void Insert_ButtonClick(object
sender, EventArgs e)
[code]...
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Mar 11, 2011
I have a treeview and a button.
OnPostBack I wish to know what are the selected categories. also, I need to give a spiciel ID number for each checkbox when data is binding.
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Aug 4, 2010
I have a usercontrol include file that has a panel on which I have programatically added checkboxes that equate to the results of a selection via a sql select stmt.
I am now trying to find the results of the checkboxes (ie checked/unchecked) using findcontrol as per
[Code]....
the commented out code is a different attempt
Is this the correct method(s) or should I do something different
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Nov 3, 2010
I have a listview with paging.Every paging has 10 rows with with a username, an email and a checkbox.
I need to be able to check a couple of checkboxes, in different "pagings", press a button and send an email every to ever user that has been checked.
Trouble is I don't really know how to remember the selected checkboxes between each paging-press.
Deos anyone have a similar solution or a few tips on how to do this? I'd prefer to solv this without jQuery, but ordinare javascript or a C# solution works fine.
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