Asp.net - Dropdownlist Results In Gridview?
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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Oct 8, 2009
I am trying to do is select a value from a dropdownlist (ddlname), hit submit (Where the problem lies) and place the results in the redirected page that carries the value in a querystring. I am under the impression that if you want to pass more then one value you use the concatenation symbol "&", correct? If not what is it? (Using '+' doesn't work neither, just thought I would try it for the same of ruling that issue out
Compiler Error Message:
BC30035: Syntax error.
Source Error:
Line 9: Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.ClickLine 10: Response.Redirect("Results.aspx?Name=?") Line 11: & Me.ddlName.selectedvalue.tostring())Line 12: End SubLine 13: End Class
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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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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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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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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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Feb 27, 2009
I use an sql server in which i have a table called crm_users. What I want to do is to create a textbox where i would type a name or some letters and when I press "enter" a pop up list will apear with the possible users found in the sql table and then select the one that I am looking for. What I dont know how to do is, how to transfer the value from the texbox , into the popup page, and then how to create a gridview with the results...
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Apr 1, 2011
I have the following code on my page
[code]
Imports System.Data.SqlClient
Imports System.Data
Partial Class _Default
[Code].....
and I can see that my values are passed to my variables when I debug the code but the results for my datatable show 0 rows.
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Apr 5, 2011
I have a GridView which is showing results and from which I am deleting a result using the auto-created delete link. My code behind to remove the row and associated info. is:
Private Sub GridView1_RowDeleting(sender As Object, e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting
' The deletion of the individual row is automatically handled by the GridView.
Dim dbDelete As New pbu_housingEntities
' Remove individual from the bed.
[Code] .....
It seems that it is not able to grab the row that is being deleted, so it is always giving me a "Object reference not set to an instance of an object" error.
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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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May 26, 2011
I have a window having 2 dropdowmlists(schemename-SN and propertyno-PN) , one chkbox ,one "VIEW" button.SN has options "all" with value=0 and many other options with respctive values.Now,i want the code should behaves as follows:
1.0n window onload, SN must b visible bt PN nt.
2.if i select SN other thn All...the PN shud b visible and if i select "All" ,PN hides.
3.when check box is checked- PN hides,and if it is unchecked- PN visible..
Important:-This whole ddl n chk box are in updatable panel,button is nt in that.I want a browser compatible code so javascript can't b used directly(cz they give problem in mozzila and chrome).Right now, i have done this JavaScript and its is working fine.
function window.onload()
{
DisableProperty();
}
[code]....
but this code is not browser compatible.here onload,onkeyup and onclick functions are used , but they dont work in other browsers except internet explorer.
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Jun 1, 2009
I have found a couple of examples on the internet to do this but really struggling to get it working in VB. (Tried a converter but had mixed results) I need the selection options of a Dropdownlist to be populated based upon the differing values in the first dropdown list.
Can anyone help with a releativley simple example in VB? Not fussed if the values are "hard coded" in the script. Or a SQL bit that pulls the data from a table
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Sep 28, 2010
I have a form that allows users to select file and then it reads the contents, parses the data and then executes a sql insert statement to add it to a database. What I am having issues with is showing real-time results. Currently, I have the import operation take place on the import form within the OnLoad event. The problem with this is it only shows the final results instead of the results real-time. Is there anyway to do this without creating a seperate thread and delegates?
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Jan 15, 2012
I'm trying to write a program that selects an item (Area Code) from a combobox and this list gets the city that was associated with this area code (another comnbobox list)
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Dec 6, 2010
How to show pop up menu from database in gridview on each gridview row items ?Example of this is : http:[url].....Move your cursor to Departure time and arrival time...a want this type of popup in gridview items....which fetch entries from database..
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Sep 24, 2009
In my application,i have a gridview in which columns are created at runtime.Actually these columns are created when i am entering data in a database table.[code]where Column1,Column2,column3 may vary during runtime.i need to enter values to these columns during runtime.But i cant bind these columns because these are created during runtime.The first column "Description" will not change.It will remain constant.For each description, there will be values for each column.At last these data will be saved to the database.How to add columns in the gridview during runtime?
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Jul 22, 2009
How can I make this program not to give me the results for the quit command input of -999 but rather just to quit without the results?
Sub Main()
Dim TempIncelsius As Double
Dim TempInput As Double
Dim Formula As Double
[CODE]...
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Sep 23, 2011
I am able to export a gridview to excel, my problem is that I cannot figure out how to remove the formatting from coming over from the girdview. Here is the code I am using to export the gridview: Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]....
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