Web Forms :: Setting Dropdownlist Selected Value
Jan 15, 2010
My problem is I need to set selected value of a drop down list to a value I retreive from a database. The example only has a know value.
Below is the HTML and Code.
<asp:DropDownList
id="ddlCatogory1st1"
DataSourceID="srcCatogory1st1"
DataTextField="CategoryName"
DataValueField="CategoryID"
AutoPostBack="true"
Runat="server" />
<asp:sqldatasource id="srcCatogory1st1"
ConnectionString="server=(local);database=db;Trusted_Connection=true"
SelectCommand="SELECT CategoryID, CategoryName FROM Categories WHERE ParentCategoryID is null ORDER BY CategoryID"
Runat="server" ></asp:sqldatasource>
Sub Page_Load()
DISPLAY_CATEGORY()
End Sub
Sub DISPLAY_CATEGORY()
ddlCatogory1st1.DataBind()
ddlCatogory1st1.Items.FindByValue("A").Selected = True
End Sub
When I run this page I get
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 222:
Line 223: Sub DISPLAY_CATEGORY()
Line 224: ddlCatogory1st1.DataBind()
Line 225: ddlCatogory1st1.Items.FindByValue("A10").Selected = True
Line 226: End Sub
Even if I take out the databind I get the same error.
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Feb 8, 2011
I have a problem in setting the selected index /value in a drop down list. The list is bound by a Linq query and I want to add an item at the top of the list and set it as the selected item.
THis is the code i am using
ListItem li = new ListItem("Select", "", true);
list.DataSource = (from ap in edc.Approvers
where ! ap.approverEmail.Equals("")
orderby ap.approverEmail
select new {ap.approverEmail}).Distinct();
list.DataTextField = "approverEmail";
list.DataValueField = "approverEmail";
list.DataBind();
list.Items.Add(li);
list.Items.FindByText("Select").Selected = true;
The listItem li is the item i want to be first in the list and also selected. Adding this before the databind just loses the item.
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Feb 22, 2011
I've been all over the Internet looking for an acceptable solution to this issue, but didn't find one, so hopefully I'll have more luck here. I've got a Html.DropDownList control in my application that pulls in a set of values from the database. That works just fine. However, I want to set the selected value in code, which has never worked correctly. This is, in my opinion, one of the worst implementations of Html helpers in MVC. Here's the culprit:
[Code]....
OK, it takes in a list of statuses and gets the text/value options set without a problem, but doesn't ever render the selected value on the option with a value (ID) of "5". I've stepped through the code as it is assigning these values, and it
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Sep 6, 2012
protected void DDLzone1_SelectedIndexChanged(object sender, EventArgs e)
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}
[Code]......
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May 7, 2015
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Jul 29, 2010
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Here's my Site.master menu:
[Code]....
In my Site.master.cs I have this:
[Code]....
In the nested master page, Products.master I have this:
[Code]....
In the Products.master.cs file I try to change the selected item.
[Code]....
The master navigation and products navigation menus work just fine by themselves. But when I've tried to set the selected item of the master menu in the Page_Load above, I can't seem to access it. What I've found in trying to do this is the NavigationMenu seems to be uninitialized. The menu Items list is empty. What am I missing here? Why are there no menuItems in the Master.NavigationMenu control?
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Mar 31, 2010
I have a datalist that holds imagebuttons which all link to images stored in a database. When I click on any of the image buttons the datalist enlarges the chosen picture and manages to dothis as the datalist is binded by the uniqueID of the image in the database. So, when I am looking at the enlarged picture, it would be nice to be able to click 'Next' & 'Prev' link buttons to move onto the next or previous picture without having to return to the datalist in between looking at a different photo.
I have managed to set up methods for clicking on 'next' and 'prev' linkbuttons that will successfully browse back and forth between photos in the datalist but the selected index always starts at 0, i.e the first photo in the datalist. So if I'm viewing the 5th image in the list and press 'next', the first image in the list shows up. I thought just by clicking on an image button would automatically set the selected index but obviously this is not the case. I have read various threads and tutorials on the net and a lot of them point to dlIcons.SelectedIndex = e.Item.ItemIndex; I have tried to put this in the itemDataBound method for my datalist but it changes nothing. And if i try to put that line of code in other messages in the class i get error messages (I'm using Visual Web Developer C#).
its part of a final year project due in 3 weeks and by now I should be writing the report! The code I'm using is pretty huge and spread out between classes but I will include what I think might help illustrate how it all works:
<asp:DataList ID="dlIcons" runat="server" DataKeyField="AttachmentID"
OnItemDataBound="dlIcons_ItemDataBound" ItemStyle-BorderWidth="1px"
RepeatColumns="5" RepeatDirection="Horizontal" CssClass="Icons"
OnSelectedIndexChanged="dlIcons_SelectedIndexChanged">
<AlternatingItemStyle CssClass="AlternatingRowStyle" />
<ItemStyle CssClass="RowStyle" BorderWidth="1px" />
<HeaderStyle CssClass="HeadeBrStyle" />
<FooterStyle CssClass="FooterStyle" />
<SelectedItemStyle CssClass="SelectedRowStyle" />
<ItemTemplate>
<asp:Label ID="lblFilename" runat="server" Font-Size="Small"
Text='<%# Eval("Filename") %>' ></asp:Label>
<br />
<asp:LinkButton runat="server" id="btnDelete" CommandArgument="<%# Bind('AttachmentID') %>"
CommandName="DELETE" Text="Delete" OnClick="btnDelete_Click"
Font-Size="small" CssClass="btnDelete" />
<br />
<asp:ImageButton runat="server" ID="imgBtnFileType" width="120" Height="120"
ImageAlign="right" ImageUrl='<%#"http://localhost:49279/PDFViewer/GetAttachment.ashx?AttachmentID=" + Eval("AttachmentId") %>'
OnClick="imgBtnFileType_Click" BorderWidth="1PX" CssClass="imgBtnFileType"
CommandName="VIEW" CommandArgument="<%# Bind('AttachmentID') %>"/>
<br /><br />
</ItemTemplate>
</asp:DataList>
The CS file:
protected void dlIcons_ItemDataBound(object sender, DataListItemEventArgs e)
{
if ((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem))
{
DataRowView drv = e.Item.DataItem as DataRowView;
dlIcons.SelectedIndex = e.Item.ItemIndex;
int attachmentID = (int)drv["AttachmentID"];
string fileType = (string)drv["Type"];
ImageButton imgBtnFileType = e.Item.FindControl("imgBtnFileType") as ImageButton;
string fileName = (string)drv["FileName"];
Label lblFilename = e.Item.FindControl("lblFilename") as Label;
lblFilename.Text = fileName.Length > 12 ? fileName.Substring(0, 10) + ".." : fileName;
}
}
The next and prev link buttons onclick leads to these two methods:
public int nextPic()
{
dlIcons.Items.Equals(dlIcons.SelectedIndex++);
int nextAttach = (int)dlIcons.SelectedValue;
return nextAttach;
}
public int prevPic()
{
dlIcons.Items.Equals(dlIcons.SelectedIndex--);
int prevAttach = (int)dlIcons.SelectedValue;
return prevAttach;
}
these were void methods but i've been stuck on this for hours and have resorted to fiddling with just about everything.
View 6 Replies
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What is wrong with this? I provided my selected indexchanged and gridview.
[Code]....
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I have a ASP.Net webform with a DropDownList control. This Dropdown gets it's values from a states table in an ObjectDatasource. The Dropdown contains states spelled out.
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or
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How can I either define the dropdown without trailing spaces in the value of the dropwdown or set the SelectedValue with adding trailing spaces?
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var dropDownList2 = $('#<%= ddlMember.ClientID %>'); dropDownList1.change(function(e) {
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} );
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what is happening now is page is blank and if I remove the above code everything shows, where I am going wrong. here is the plain and final javascript code which worked:
<script language="javascript">
function CheckDropDownState(lstbox)
{
if (lstbox.selectedIndex == 3) { document.forms[0].ddlMember.disabled = 1; }
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}
</script>
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<asp:TemplateColumn HeaderText=" OnSite/OffSite" >
<ItemTemplate>
<asp:DropDownList ID="ddOnsiteOffside" runat="server" onchange="ToggleOnOff(this)">
[code].....
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Here's the code:
<asp:FormView ID="FormView1" runat="server" DataKeyNames="ID"
DataSourceID="SqlDataSource1">
<EditItemTemplate> [code]....
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I have the following code:
[Code]....
However, the wrong option is selected, and when I view page source, it renders like this:
[Code]....
Why is this occurring?
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protected void btnOkCustomers_Click(object sender, EventArgs e)
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