when i use this code to set the selected value of a dropdown from code behind i get an error
"object reference not set to an instance of an object"
[Code]....
in above code AraeDDL is dropdownlist, and AreaFromMyDraft is a String variable that is currently storing the value to set in the dropdownlist.
Bit of a strange request but is it possible to set the selected value of a cascading dropdown in code? I have 2 dropdowns, the second is populated using the value of the first. Heres my markup:
<asp:DropDownList ID="ddlApplication" runat="server" CssClass="form"></asp:DropDownList>
<ajaxToolkit:CascadingDropDown
ID="cddApplication"
runat="server"
TargetControlID="ddlApplication"
Category="Application"
PromptText="[select an application]"
ServicePath="webservices/Application.asmx"
ServiceMethod="GetUserApplications" />
<asp:DropDownList ID="ddlDelegate" runat="server" CssClass="form" />
<ajaxToolkit:CascadingDropDown
ID="cddApplicationUser"
runat="server"
TargetControlID="ddlDelegate"
ParentControlID="ddlApplication"
Category="ApplicationRole"
PromptText="[select a user]"
ServicePath="webservices/ApplicationRole.asmx"
ServiceMethod="GetApplicationUsers" />
Basically I want to set the selected value of ddlApplication, then populate the ddlDelegate, then I want to set the selected value of ddlDelegate.
I did my drop down list that get it,s values from database and when run the application it did not work and compiler did not see the code
// aspx
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:DropDownList ID="DDlProductFamily" runat="server"
ondatabound="DDlProductFamily_DataBound"
onselectedindexchanged="DDlProductFamily_SelectedIndexChanged">
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="DDlProductFamily" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
// cs
protected void DDlProductFamily_SelectedIndexChanged(object sender, EventArgs e)
{
using (SqlConnection Con = Connection.GetConnection())
{
SqlCommand Com = new SqlCommand("SelectThumbByProductFamily", Con);
Com.CommandType = CommandType.StoredProcedure;
Com.Parameters.Add(Parameter.NewInt("@ProductCategory_Id",
DDlProductFamily.SelectedValue.ToString()));
SqlDataAdapter DA = new SqlDataAdapter(Com);
DA.Fill(dt);
DataList1.DataSource = dt;
DataList1.DataBind();
}
}
I have seen article in code snippet but i have never used web services so that is complicated .
View 1 RepliesHow to fill the value in drop down box according to value selected in another drop down box?
View 1 RepliesI have a dozen tables, and two dropdown lists.The first drop down list shows the table names. The second dropdown list needs to be poulated with the data from the specific table selected in the first dropdown list.I wrote a stored procedure that will query the selected table name choosen in the the first dropdown list. My results though are only showing this...
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Values in multiselect dropdown not getting selected when Select All option is selected for a SSRS dropdown. There are multiple dropdowns on the page. We have one dropdown whose output is being used to populate the second dropdown using a stored procedure. When we check the Select All checkbox on the dropdown then ideally upon page refresh all the values should get selected in the dropdown, but in this case the page refreshes back to the blank dropdown, forcing the user to select the values again. The next dropdown too does not get populated. This makes it impossible to run the report for all the cases by using Select All. We ran the report on differnet database environments. My current location is Mumbai,India, the report worked fine when we ran it on a Bangalore,india database. This issue occurs when we try running it on a Chicago database server. I am using SSRS 2005, SQL2005.
View 1 RepliesI have a form in asp.net mvc that retrieves records from the database. this form have dropdowns. in Edit action of controller it is must to have selected the already inserted items. suppose if i am taking the User information for edit, then its City,State and country must be selected as they inserted before.
So i tried in Edit:
int CityId_ = objAM.GetCityName(User.CityId);
ViewData["Cites"] = new SelectList(City.GetAllCities(), "CityId", CityName", CityId_);
same like country and state. but though CityId_ have value but it no appear like that. It defaults from first city (same for all) why this because ?
i just gone throught this blog where i found , the assigning third parameter name should be in the object's property. but let say I have primary and Fk relationship, but columns name are different then it seems MVC strongly coupled feature fail. Why this is ?
I use telerik radgrid, where i add dropdown column for add and edit new grid row.When i update grid row item the dropdown value is not disply in dropdown list, but disply in dropdown first data.
View 1 RepliesI am getting this error: "Cannot have multiple Items Selected in Dropdown", when I Edit the data.
I am trying to get the selected row "DataValueField" value from a DropDown control. but every time get the very first row value. don't know why.
protected void ddCategory_SelectedIndexChanged(object sender, EventArgs e)
I am not trying to achieve anythign fancy but just trying to set default selected value for one of the dropdown that I am using. for that I am doing Items>selected= true for whatever item I want selected when i load the page. In my case, it is a month dropdows and I am selecting date 14 as selected default value out of all 30 values but somehow, out of the blue .NEt decides to show me 29 instead of 14. I am not sure if there is some another setting that is overwritting this value.
View 2 RepliesI want to stop postback if a certain value from a ddl is selected.
I've used VB to create a page whereby if a certain value from a ddl is selected then a hidden panel becomes visible. The problem is the likely answer to a majority of my ddl's is 'No' (or a no type response), however, even though the panel visibility remains false upon selecting No a postback still occurrs, the page refreshes and moves back to the top. I suppose this is a question with 2 possible solutions (or 2 questions rather)
1: Is there anyway of setting postback to false if selected value = No? A typical example of how my code appears is below
[Code]....
(i've used the value '1' to represenet Yes)
2: Is there a way of setting the page position after postback? As you can see in my code above i've set the focus on the next control (being a Radio Button) but i mean, is there an actual way of defining where the scroll bar is set?
this is with ref & continuation of post [URL]
in which day drop is dynamicalluy populated at run time based on the month selected
the values selected are stored in the database.
suppose the user selects NOV 22 of the current year
when the user want to rertive the same stored data i need NOV in month dropdown & 22 in day dropdown
i get the month correctly but day dropdown is balnk
I try to display the selected value with dropdown list by using label control but cant display it in firefox but works fine in internet explorer.
Below are my code:
[Code]....
how I get the selectedvalue of a dropdown list in a gridview?
cmdInsert.Parameters("@Cost_ID").Value = gvItems.Rows(i).Cells(0).FindControl("ddCostID").
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I have 1 drop down, 1 text field and 1 command button i.e. "Search". Dropdown contrains following values
Type1
Type2
Type3
In textbox user will enter numeric or alphanumeric value
Here I want to check if 'Type1' is selected so user can enter only numeric value between 1000 and 2000, otherwise display some message "Entered value is not valid for "Type1". I want to display this message thru required validator error message property
If user select 'Type1' and 'Type2' then user can enter any alphanumeric value other than 1000-2000 numeric range.
I want to implement thru Search button or once user leave the textbox after entering value. Here I want to display message.
I have created a dynamic dropdownlist. I need to get the selected values from the dynamic list and store it my sql database.
View 5 RepliesI have a small problem with drop down list. I have a aspx page which shows the information of a customer and there is an Edit button, which will take the customer to the edit information page. On the edit information page, I have drop down lists and I want the selected value in the drop down list to have the current value of the current customer on Page Load event.
View 4 RepliesI have a function on page load which will work based on dropdown selected value. and I am using this dropdown in a user control. So getting problem because the dropdown value is not loaded yet before Page Load. How Can I do that using those control still.
Here is my code below.
public partial class GradeEntry : System.Web.UI.Page
{
StudentManager studentManager = null;
CourseManager courseManagerObj = null;
GradeManager gradeManager = null;
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I think this is almost impossible but I would like to ask.
I have a dropdown in my page:
The Name Dropdown is combined with item name / manufacturer name
This is what I want to do:
When a manager select a name, The text on the dropdown change to only item name and read only. (example: 44 inch Side Brushes)
The Manufacturer Textbox automatically retrieves the manufacturer name and read only.
I'm having a dropdown list which is being bound dynamically from database. For that i've written selected index changed event which captures the DataValueField of dropdownlist and returns few values from the database again. This dropdown list is in a datalist control and there are 5 items in my datalist control.Selected Value is not working for first 3 items in datalist and working for remaining items.i've changed code many times and i got mad why it is not selecting the selected value..Here is my aspx code and codebehind..
<asp:DropDownList ID="drpHotels" AutoPostBack="True" runat="server" Width="200px" DataTextField="hotel_title" DataValueField="hotel_id" OnSelectedIndexChanged="drpHotels_SelectedIndexChanged">
<asp:ListItem Text="Select a Hotel" Selected="False"></asp:ListItem>
</asp:DropDownList>
[Code]....
For the first item in datalist when i select a value then on Selected Index Changed event, i can see the LISTITEM "SELECT A HOTEL" instead of selected original value.NOTE: this is not happening for all the datalist items, only for first 3 items..
I'm doing property booking based project.
I have repeater control for search results.
For every search result I create a dropdown list with 2 month booking overview.
<ddl>
<item value = "1"> January - February </item>
<item value = "2"> February - March </item>
etc.
Then I call function to generate 2 months calendar view, which has two parameters generate(startmonth as Integer, sku as string)
Everything works when I hardcode starmonth as some integer.
I spent all day with no progress on how to pass value. I need a guide. I guess second problem will be to restore changed dropdown values on Postback, but one step at a time.
But what I want to do, to pass selected item value, to function, that would change view for property associated with this dropdown.
I have a gridview with footer template which has dropdownlists.. I am populating these dropdownlists at row_created event of gridview..
When i want to update any record and when user clicks edit in the gridview i must get the dropdownlists and the values which were already selected previously for that particular item .. How to do this?
In the row data bound event i get all the dropdownlists populated but they are not the one which was selected. How to display values in dropdownlist which was already selected earlier?
I need to feach the selected value of a dropdown list which is in gridview at gridview_RowUpdating event.this is the way I have done that, but it is not working can sombody guide me to do this.DropDownList itemCode = gvTest.Rows[e.RowIndex].Cells[0].FindControl("itemCode") as DropDownList;
if (itemCode != null)
{
Session["itemCode"] = itemCode.SelectedValue.Trim();
}