In MS Access there is a great method call 'dropdown', you set the focus to the control, mycontrol.setfocus and then call mycontrol.dropdown, really useful when using cascading dropdowns.
Is there a similar method in asp.net or how would I get the dropdownlist to dropdown through code?
I am currently writing an MVC app and currently only have one master page. I would like to add a dropdownlist to my main page and on selection of this to be able to switch the master page used. Has anyone acheived this before. I am unsure of how to force the onchange in the dropdown to fire some code behind in my controller.
View 3 RepliesCurrently,below is my code.
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source= E\SQLEXPRESS;" + "Initial Catalog=k;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "select column_name from information_schema.columns where table_name='examtimetable' '" + dd_list + "'";....
I receive an error "Incorrect syntax near 'System.Web.UI.WebControls.DropDownList'."
I have many controls on my form, but in particular, I have 2 dropdownlists. 1 dropdown list has 2 values, and each value controls what the second dropdownlist displays. This is an edititemtemplate and both dropdowns have the selecteditem set via '<%# Bind("fieldname") #>' on page load.
THe problem is, if I change the value of the first dropdown, it errors out because the second dropdwon has a bound value that is no longer acceptable.
Can I cancel the bind of the second control, if the the first one is changed? I would like to cancel the bind, and update the values by using a different datasource depending on the value of the first dropdown or hardcode the new values.
If Dropdown1 has a value of "A" for example Dropdown 2 Shows Values "1", "2", "3"
If Dropdown 1 has a value of "B" , Dropdown2 Shows Values "4", "5", "6".
It binds fine initially, but if I change Dropdown1 from A to B, I want Dropdown2 to show the new values, maybe with a default of "Select an Item" and not error out b/c it's attempts to bind a value of 1, 2, or 3.
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.
i have dropdownList Binded to a data source and its working fine But want i want to do is when the page loads its initial value should Blank until clicking the dropdown button
View 6 RepliesI'm trying to figure out how to grab results from AD (works fine) and then take those results and sort them alphabetically.
[Code]....
I have a dropdown which i have binded code behind as:
protected void PriorityType()
{
DPriority.Items.Add(new ListItem("--Select--", "0"));
DPriority.Items.Add(new ListItem("High", "1"));
DPriority.Items.Add(new ListItem("Medium", "2"));
DPriority.Items.Add(new ListItem("Low", "3"));
}
It shows the items in gridview correctly but when i insert in database as DPriority.SelectedValue . it does not save the text but the index
Like if i choose High in database it saves as 1 but it should save as text not index.
I have some dropdown list boxes that I need to fill with data from a database but I also need the first option to be "Show All"... So I need to combine using a datasource and manually adding an item to the top of the list. I have tried two different ways with no luck:
1. with the appendDataboundItems = true, on aspx page, and below code in codebehind:
//lstClass.Items.Clear();
I have a dropdown which shows filesnames and when the index is changed, the slected file is offered for download. I also have a button which creates new files ... now after a new file was created, the new filename should also be shown in the dropdown. It works fine, when I refresh the page, but this is not what I want. I tried putting the dropdown in an updatepanel and giving it the file create button id, it failed ... is this the correct apporach or is there an easier way?
View 5 RepliesHow to add a repeater header item template Dropdown using code behind
View 1 Replieshow can I set the dropdown width of my dropdownlist just like in application project combobox?
View 5 RepliesI have a DropDownList on an ASP.NET page that gets populated by a SQL database.
<asp:DropDownList ID="ddlName" runat="server"></asp:DropDownList>
The population is down in the code behind file:
ddlName.DataSource = SqlDataSource1;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
I was wondering if it was possible to change the background or text color of an item in the list based on it's value? I just noticed that the example below works when the page first loads but on postback the text color disappears even though that is where the code is. Is there something I am missing?
protected override void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlName.DataSource = SqlDataSource5;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
foreach (ListItem item in ddlName.Items)
{
if (item.Value == "Item 1")
{
item.Attributes.Add("style", "color:red");
}
if (item.Value == "Item 2")
{
item.Attributes.Add("style", "color:red");
}
}
}
}
I'm using entity framework and i have a problem that this dropdown ignores my changes / does not reflect db.
<asp:FormView ID="FormView1" runat="server" DataSourceID="edsFoo" >
<asp:DropDownList ID="myDD" runat="server" AppendDataBoundItems="true" DataValueField='<%# Bind("something") %>'>
<asp:ListItem Value="0" Text="NO" />
<asp:ListItem Value="1" Text="YES" />
<asp:ListItem Value="2" Text="PARTIALLY" />
</asp:DropDownList>
</asp:FormView>
'Something' (in binding) is an int and it's 1. When the form is started, I always see NO, although the value coming from EF is 1.
How to populate dropdownlist in a gridview by selecting another dropdown in same gridview
i tried the code in driiopdownlist selectedchanged
dropdownlist d=(dropdownlist)gridview.findcontrol("dropdownlist1") but it gives null
I need a develop a smart dropdown list for an inhouse application
Let assume, i have a dropdownlist with the following values:
ABC
EDF
XYZ
A123
B456
Now when the user types A in the drpdownlist (we can type anything onthe dropdownlist, but we can superimpose a textbox on it), the dropdwn list should sort itself and show only ABC and A123.
I have two DropDownLists; DropDownListStart displays the hours 09:00 - 19:00 and DropDownListStop displays 10:00 - 20:00. When the user chooses one of the hours in DropDownListStart I want the program to adjust what's shown in DropDownListStop so that the first hour shown is one hour after the hour chosen in DropDownListStart. How can I do that in code behind (c#)? An example: if the user choses 13:00 in DropDownListStart I want DropDownListStop to display only 14:00, 15:00, 16:00, 17:00, 18:00, 19:00, 20:00.
View 12 RepliesI have a DDL that has 5 options in it. Based on the options a different query is run and bound to
a detailsview. At this point the DDl does not fire the query.
Here's the DDl from the page and the code behind
[Code]....
I am generating a dropdown list in codebehind and cannot get the selectedindexchanged event to fire automatically. It works fine when put directly into the ASPX page, but I need it to be in the codebehind.
This doesn't work -
[code]....
I removed some items from a dropdownlist, and now I want to re-initialze the items which I have on aspx file.
<asp:DropDownList ID="s1" runat="server">
<asp:ListItem Value="0.00">Select</asp:ListItem>
<asp:ListItem Value="0.25">0.25</asp:ListItem>
<asp:ListItem Value="0.50">0.50</asp:ListItem>
<asp:ListItem Value="0.75">0.75</asp:ListItem>
<asp:ListItem Value="1.00">1.00</asp:ListItem>
<asp:ListItem Value="1.25">1.25</asp:ListItem>
<asp:ListItem Value="1.50">1.50</asp:ListItem>
<asp:ListItem Value="1.75">1.75</asp:ListItem>
</asp:DropDownList>
Such as I removed "1.50" and "1.75", and when a button clicked, the dropdownlist will initialze again with these 8 items. How do I do that?
I have the following Dropdown List
[code]....
My problem is that some of the users that used to be in the list have left the company so we want to mark them inactive. When they are inactive they should not show up in the DDL to be selected to be assigned to. But there are existing records that they are already assigned to. If they are no longer able to be assigned their is a column called IsActive in the db that is set to 0. The Datasource filters for only == 1 when filling the datasource.
When it tries to render the control where a selected value is not in the list the Browser throws an error. I can not seem to find an event where I can intercept and set a value that is legal.
The solution I would like would be to add the listItem to the Control in the code behind then call the bind("AssignedTo") in the code behind instead of in the aspx page. This way linq would still handing the update of the DB record for the update event.
On my formview I have a drop down list that is populated with the names of the files in a certain directory. This works fine, but when the drop down list selected value is bound to the database field I get the following error :
'ImageFileDropDownList' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
I have setup other drop down lists in the same formview populated from SqlDataSources and these all work fine. I can see perhaps why this is an issue because I have not specified a DataValueField or a DataTextField for this drop down that is populated in code (whereas I can for the SQL bound ones) because I'm not sure what these settings would be.
I need to have a "blank" option as well so that the field does not default to the first value in the list.
My code (I have stripped out some meaningless controls) :
[Code]....
My code behind populating the ddl :
[Code]....
I am successfully able to add new items to a drop down list using Javascript.
The script I am using is
function FillJavaScriptValues() {
Have spent hours trying to create a Dynamic Data Field Template holding a DropDownList which is extended by the AJAX Cascading DropDown extension.Final form holds multiple cascading dropdown boxes. User selects Country (Land) then Postcodes, Counties (Provincie) are populated. Once postcode is selected then towns (Plaats) are populated. The problem I am now facing is that the viewstate for the dropdown lists is not being saved/restored after an insert action or custom validation error. So basically the dropdown lists are being reset to their default values.Some code (if missing parts, just ask and I will post them) - Don't mind the code structures etc... needs some refactoring :)Attribute I created:
[Code]....
KlantMetaData (=> Klant is Dutch for Customer ):
[Code]....
DynamicDropDownList Control I created:
[Code]....
Dynamic FieldTemplate created for inserts:
[Code]....
EntityTemplate I created:
[Code]....
Webservice methods created:
[Code]....
Code in masterpage:
[Code]....
I select a item from gridView and trying to show/update/delete in From view. In Form View I am using the dropdownlist filling it in Code behind. Then i bound the list. But the problem is it is not showing the slected value. Here is the code
asp code <asp:GridView ID="grdVRegion" runat="server" AllowPaging="True"
AutoGenerateColumns="False"
Width="525px" PageSize="20" DataKeyNames="intPKCountry_DetailID" [code]....