Asp.net - Get The Cascading Dropdownlist To Work In A Gridview Edittemplate Fields?
Sep 14, 2011
Error is ddlgvRooms' has a SelectedValue which is invalid because it does not exist in the list of items.Parameter name: value
I read a lot of people having issues with this particular problem but non of the fixes have worked for my case.I have tried a few different things such as setting appenddatabounditems="true" also tried to set in the itemcollection a default null value.Most of the forums post on this that I read were from a couple years ago im hoping they fixed this bug already and I am just overlooking something.I am trying to get my cascading dropdownlist to work in a gridview edittemplate fields. I created these in my detailsview on insert everything works great.
MySetup Basically I have a webmethod that has 2 functions getRooms and getJacks that are supposed to grab the data from the 2 datasets that I have created.The Datasets get their data from a couple of SQLSTOREDPROCEDURES.My aspx page dropdownlist and AjaxCDDL looks like this
<EditItemTemplate>
<asp:DropDownList ID="ddlgvRooms" runat="server"
SelectedValue='<%# Bind("intRoom") %>'>
[code]....
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Aug 28, 2009
How can I make GridView work like DropDownList where you can Enable Postback
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Aug 31, 2009
How can I make GridView work like DropDownList where you can Enable Auto Postback
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Apr 25, 2012
I have two dropdown within a DetailsView and I want to work in cascade, the idea is that an area contains various issues and these issues depend on the selected area, but I get the following error: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
[Code]....
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Sep 7, 2011
I have been practicing with the online tutorial on how to do this except my dropdownlist just gets a "method error 500" in the dropdownlist.
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Feb 7, 2012
I have two cascading dropdown lists I'm attempting to bind to two separate SqlDataSources each.
These dropdownlists exist in a FormView's EditItemTemplate. Inside the EditItemTemplate two sqldatasource controls exist that populate the department and the jobname. The DeptID and the JobID are the primary keys in those tables. This creates the "cascading effect" between departments and jobs. When a department is selected, only the jobs associated with that department appear.
This piece is working properly.
<asp:FormView ID="frmProfile" runat="server" DataSourceID="sqlDSProfile"
DataKeyNames="EUID" style="margin-top: 0px">
<EditItemTemplate>
[Code].....
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May 10, 2012
I have two comboboxes say
DDL 1 : Artist
DDL 2: Albums
And a Gridview containing (album name, artist name, no.of tracks, year, etc), What I want to achieve is: when an option(artist1) in DDL1 is chosen, then the albums related to DDL1 needs to display in DDL2 and also it must update the appropriate values in the gridview (artistname, albums(album name -no of songs, year)etc... based on the selection made (language: Asp.net(VB)-Sql server ).
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Aug 17, 2010
I have several sqldatasources for my gridview. All of the columns are autogenerated. However they all have some consistent fields and I'd like to make those fields template fields so I can modify the edit template for them such as adding a drop down menu. Is this possible?
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Jun 1, 2010
I have been placing my database fields (details view) on a form but for some reason they are all appearing as text boxes with the exception of date fields. Why are none of them showing as drop down lists?
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Aug 19, 2009
I'm having some trouble getting the results of the drop-downs in a gridview, and haven't found any helpful articles for VB code.
What I'm trying to do is build a site for tests. So far I have the gridview built w/the extra column for a drop-down list where the true/false answer will be selected. When the test is completed, there is a submit button. All is well except I need to be able to get the results of each drop-down list on post-back to a variable or array (each test contains 10 questions) so the results can be checked/graded. When the results are determined I would like to display a label in it's place and change the text value accordingly (correct or incorrect), so I'll need to be able to enumerate these as well (i.e. label1.text="Correct!", label2.text="Incorrect!", etc...).
Code so far.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1" BackColor="White" BorderColor="#3366CC"
BorderStyle="None" BorderWidth="1px" CellPadding="1">[code].......
The preceding code loads 10 rows, 2 columns (column1:Question | column2-[DropDownLists]:Answer). I'm a freshman when it comes to development, so if you need additional info let me know.
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Mar 5, 2012
I have created a connection string, and i am populating a dropdownlist with an ID from a sql database.I want to be able to click on a ID from the dropdownlist and run a query to populate a gridview with data. I have made the dropdownlist autopostback = Enabled. I am not getting an error.
Here is my code:
Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlContracts.SelectedIndexChanged
Dim ds As New DataSet
[code]....
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Feb 23, 2012
I'm having trouble with a DropDownList within a GridView that posts a NULL value when in fact a value is selected from the list when using inline editing.
The problem is that I can't use this method to bind the value to the UpdateCommand in my SqlDataSource:
SelectedValue='<%# Bind("Value") %>'
The reason for this is because the value might not exist in the list so it throws an exception.
Is there a way I can bind the value to the UpdateCommand without using SelectedValue?
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Apr 5, 2011
I have a list of items in a GridView, with one column I'd like editable through a DropDownList.
I do not wish to put the GridView into 'edit' mode or have any 'confirm/update/save' buttons.. I just want autopostback on the DDL, and an OnSelectedIndexChangedevent to update the row.
Problem is, from my OnSelectedIndexChangedevent within the DDL, although I can see the new value to save, I can't discover the row to update from the GridView.
how I can achieve what I wish? Other than perhaps storing the row id within the DDL? Maybe turn it around so the GridView's events are called?
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Nov 21, 2011
I need to create a gridview which fills its column with data from an excel sheet and for each column in the gridview, the header should contain a drop down list with listitems like telephone, name, price which the user will select and set as the header for the particular column. I imported data into gridview but I am not able to create a drop down list in the gridview. If I try to create a dropdownlist in the designer page, it is just creating the dropdownlist in the gridview header but not populating the data. So How can I create a dropdownlist in the header of the gridview while populating its column data from excel sheet.
The code I used to populate data into gridview is
Dim con As String = ""
Select Case Extension
Case ".xls"
'Excel 97-03
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May 6, 2011
I have been looking for a solution to this for a while though and seen many posts that show me how to do it but yet I cannot get my SelectedIndex Changed event to fire when the DropDownList is changed.The DropDownList AutoPostBack is set to True,[code]
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Jan 12, 2010
I have Gridview with Template Field.And I Put Dropdownlist at footer row of gridview. but when i insert the value from a database table in dropdownlist , than it generate error.
for filling value i declare variable like in databound event of gridview.
for example: dim varclass as new dropdownlist
varclass=Gridview1.footerRow.findcontrol("ddlClass ")
it generate error that: Object reference not set to an instance of an object.
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Aug 17, 2011
i am working in a project and what i want to do is to have a search drop down list and text box. Lets say i have a gridview with all my results from database. In gridview i can see Name, Surname, country, phone number. From the drop down list i want to select the column in which i want to make my search. For example, from 3 choices(name, surname or country) i will select country. Then i have to type a country name in text box and the search engine will make the search for the country column. For example if i will type "U.K" in text box as a result i want all the people(name,surname,country) WHERE COUNTRY = U.K.
[Code]...
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Sep 7, 2010
Trying to get the findcontrol to work so I can set the default value of the dropdownlist I have in a template field, but I'm having no luck. Am I doing something wrong?
[Code]...
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Jun 17, 2011
a query, as I can make a development of two nested dropdownlist in a gridview, so that one is loaded with data according to the selection of first.
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Nov 30, 2010
Firstly i'm not asking for the exact code here but the below is what i'm trying to do:I have a gridview with DropDownList and CheckBox and I have a button outside the gridview that will add a new row within the gridview.I have no problems with the adding row but I have a problem with saving the state of the checkbox/drop down list.Everytime I checked the checkbox and add a new row, all the DDL/CB will be reset.So how can I do it so that when I add a new row, the checkbox that I've checked before will still remain check.
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Nov 18, 2010
i have problem for the drop down list in the grid view, it not fire the select index changed. I bind the data for the drop down list when the row databound. But when i select the data, it not fire the select index changed. Another drop down list which hard code the item list fired the select index changed. Below is the code behind and the front end code.
<ItemTemplate>
<asp:DropDownList ID="ddlItem" runat="server" Width="80%" AutoPostBack="true" OnSelectedIndexChanged="ddlPrice_SelectedIndexChanged"></asp:DropDownList>
</ItemTemplate>
[Code]....
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Oct 7, 2010
I would like to show different values in a dropdownlist, while editing a gridview, depending on which user is logged in. For example...
The officer would see "Approved by Officer" status.
The director would see "Approved by Director" status
I am trying to add these programatically to a dropdownlist which I have in the edit template of my gridview (approvalsGrid). Here is my code:
Protected Sub ApprovalsGrid_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles ApprovalsGrid.RowUpdating
Dim ApprovalEditDD As DropDownList = CType(ApprovalsGrid.Rows(ApprovalsGrid.EditIndex).FindControl("ApprovalEdit"), DropDownList)
[code]....
I do not get any errors. But get an empty dropdown with no items. Am I using the correct event?
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Sep 15, 2011
Error Dropdownlist has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value I have been banging my head over this error for about a week now. I have searched posted on other forums and still no solution to my issue. I have seen the FindControl being suggested but do not know how to implement this.
Basically I have 2 webmethods that reference 2 datasets which then populate my ajax cascading dropdownlist. In insertmode they work great however in editmode i get the above error.I have removed the selectedvalue and added
DataSource='<%# Bind("intRoom") which works sort of except for the fact that when you click edit it does not retain the original value of that particular record. Other things i have tried are as following:adding the items to the itemcollection of the dropdownlist turning appenddataitems to true on also tried to use the findcontrol but dont understand that punching my monitor and slamming my keyboard
Now I know i could get this to work by using a sqldatasource with some t-sql to get my dropdownlist to work however I thought by reusing my webmethods my code would be more professional. So if there is anyone out there that can help me understand why the value for my dropdownlist is not being populated or does not exist during gridview editing Also will post code if asked not sure what you would like to see rather than posting everything.
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May 25, 2010
This seems super weird to me. I have a callback handler done in VB which works fine with this code:
<!-- Div Outside Form -->
<div class="container">
<form id="querydata" runat="server">
[code]......
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Feb 15, 2012
I just pulled an access dbs that contains obj fields into a VB project in a gridview in a windows form. when the form is called I get an error message on the gridview: System.arguementexception: parameter not valid.
I have no idea what is going on, but it is apparent that the OBJ field data is not carried over into the dataset. The data in the OBJ fields consist of shortcuts to applications.
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Sep 29, 2011
This is the following. Normally, when i have a city, i'm using some javascript to autocomplete the cities as the user type. Now i want it to make it automaticly, using the edittemplate. So i would change :
[Code]...
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Apr 5, 2012
I'm trying to use hyperlink fields in my gridview to pass certain values into another page using querystrings. On the next page I've put 'labels' that should be populated with data from the gridview, however nothing happens. This is my gridview code:
Code:
"<asp:GridView ID="GridViewGuitars" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSourceGuitars" DataKeyNames="ProductID" BorderColor="White">
<Columns>
[Code].....
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Oct 4, 2011
I have the following problem: I select a customer from a dropdownlist and then the gridview should load all items of all orders of that customer. I have the following query:
Dim allorders = From ord In db.Orders
Where ord.CustomerID = Convert.ToInt32(CustomerDropDownList.SelectedValue)
[CODE]..............
I also tried to modify the query as follows:
Dim orderitems = From oi In db.OrderItems
Where oi.OrderNumber = (From From ord In db.Orders
[CODE]...........
But this does not work. I just started using LINQ.
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Apr 15, 2012
The following code runs successfully with no errors, but I still don't get the new data from the grid, by adding a break point, and stepping forward, the data in the variables are the original data, not the updated data.
Private Sub grvSample_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles grvSample.RowUpdating
Dim row As GridViewRow = DirectCast(grvSample.Rows(e.RowIndex), GridViewRow)
Dim passportNumber As TextBox = DirectCast(row.FindControl("txtNumber"), TextBox)
Dim expiry As TextBox = DirectCast(row.FindControl("txtExpiry"), TextBox)
[Code] .....
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Apr 18, 2009
I'm trying to format a column from a GriedView based on an XML file as its data source.
I've just set the DataFormatString column property to {0:MM-dd-yyyy} from my BoundFied and set the HtmlEndure to false as well. This bound field has values like 2009-04-17 00:00:00.
But the column is still not getting the expect format (MM-dd-yyyy). I've just checked all orthers properties, but I really did not figure out what is my mistake! Do you have an idea about that?
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