MVC :: DropDownLIst Setting The Selectedvalue?

Jan 8, 2010

I binded the dropdown from the table Languages, now it shows all the languages:

ViewData("Languages") =
New SelectList(objLang,
"SysLanguageID",
"LanguageName")

Now when I click the edit then the dropdown should show the selectedvalue based on the languageId that is in stored in the Preferences table under the user.If i give the third parameter as the selectedvalue it is showing the selected value but it is not showing the other languages.

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Setting SelectedValue For One DropDownList Also Updates The SelectedValue For Another DropDownLIst

Jul 21, 2010

I have a WebForms page that has two DropDownList controls on it that both contain a range of temperatures from 60-80 degrees, one for heating the other for cooling. They are declared in the .aspx as:

<asp:DropDownList ID="heating" runat="server" />
<asp:DropDownList ID="cooling" runat="server" />

The values for each list are populated in the code-behind using:

for(int i = 60; i <= 80; i++)
{
var listItem = new ListItem(i + " degrees", i.ToString());

heating.Items.Add(listItem);
cooling.Items.Add(listItem);
}

When I try to set the selected value for each DropDownList using the values in an object containing data loaded from the database using:heating.SelectedValue = myHome.avgHeatingTemp.ToString();
cooling.SelectedValue = myHome.avgCoolingTemp.ToString();

The SelectedValue for both lists is set first to the value in myHome.avgHeatingTemp, then to the value in myHome.avgCoolingTemp. Heres what the values are for each variable after each step of the process of setting the SelectedValues:

Initial State
heating.SelectedValue: 60
cooling.SelectedValue: 60 [code]....

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Get SelectedValue() Of DropDownList After Setting The Value?

Dec 13, 2010

I have a databound dropdownlist on a page, where in the page_load I set the selectedValue (inside a 'not isPostBack').

Although the page displays fine and shows the correct item as selected.. inside the page_load if I try and get the selectedValue() and display it to the screen, I always get null... selectedIndex is -1.

I have a button, which when clicked refers to this ddl's selectedValue, and here it pulls through the the expected result.. so how come I can't see it immediately after setting it, while still in page_load?

edit: the code..

ddl declaration
<asp:DropDownList runat="server" ID="dlCountryList" DataSourceID="dsCountryList"
DataValueField="countrylistid" DataTextField="description">
</asp:DropDownList>

and the page_load

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
dlCountryList.SelectedValue = "GR"
Response.Write("*" + CStr(dlCountryList.SelectedIndex) + "*")
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May 11, 2010

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.

If I try to set the drop down to:
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I get an error that the value does not exist in the dropdown even though it does exist. But if I pad the value with the correct number of spaces to the right, it works like so:
DropDownStates.SelectdValue = "Ohio "
or
DropDownStates.SelectdValue = "Michigan "

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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Nov 11, 2010

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I have a repeater with a DropDownList in it. I set the datasource of this list in the itembound event en set the selectedindex. When I debug the selectedindex is set, but when the page is done loading for all the item the default item is selected.

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
var ddl = (DropDownList)e.Item.FindControl("DataFeedItems");
ddl.DataSource = FilterDropDownData();
ddl.DataTextField = "ColumnName";
ddl.DataValueField = "ColumnName";
ddl.DataBind();
[code]...

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Forms Data Controls :: Dropdownlist Setting Selectedvalue From Formview

Mar 11, 2011

I'm populating a dropdownlist in a formview with a different datasource from the formview's. I need to set the selected value according to the value in the formview's datasource but I'm having a hard time doing that.

Here's the code:
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DataSourceID="SqlDataSource1">
<EditItemTemplate> [code]....

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Nov 25, 2010

I have officially wasted about two days trying to figure out what the heck was going on with my asp.net page. I actually thought it was an issue with my updatepanel code, but after reading another post I was able to reproduce the same results. [URL]

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Oct 27, 2010

In our asp.net web application we load the dropdown list boxes in the page load. We than set the SelectedValue of each dropdown list box to an object from session. We have event handlers for many of the SelectedIndexChanged events of the drop down lists boxes, but these do not get executed when we set the selected value programmatically.

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. Following is the code:

<asp:TemplateField
HeaderText="Course"
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[Code]....

Error: BC30452: Operator '=' is not defined for types 'Object' and 'System.DBNull'.

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I have a dropdownlist that is populated by a webservice using the ajax cascading dropdown. I have not been able to set the selected value using javascript. It appears that the values do not exist when the javascript runs. I placed the javascript at the bottom of the aspx page

<asp:DropDownList ID="ddlBusinessArea" runat="server"></asp:DropDownList>
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[code]...

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Here're my code


[Code]....
In file aspx [Code]....

Result Label : 01 - 11 -

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Oct 27, 2010

On an aspx page I have a dropdownlist and a button.

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Same result with .SelectedItem.Value and .Text

Why? And how do I get the item actually selected?

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Oct 1, 2010

I have a dropdown list that has a bind on it and I get this error. Why am I getting this error and what can I do to fix it. here is the code for the dropdown I currently have:

[Code]....

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I've got a set of cascading dropdowns, but I want the default selectedvalue to be there when when page loads though.Right now, my dropdownlist is defaulting to the first value in the DDL.
(ASP.NET C#) and the code (issue is with the "DDL_Assignment" dropdown).

[Code]....

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I am trying to do this as asked earlier. The only difference that I found is additional List item that was included in above code.

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[code].....

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Web Forms :: Check A Selectedvalue From A Dropdownlist Against More Than One Value?

Jul 15, 2010

In SQL, you can create a query and use a "IN".. Select * from tOffices where OfficeID in ('1', '2', '3'). Is it possible, in my vb.net code behind to check if a selected value is "in" a list of values like this?

If ArrangementID.SelectedValue in ("6","7","99") then...

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Web Forms :: DropDownList Check For SelectedValue?

Oct 15, 2010

I have a DropDownList which is databound and pulls back the values from SQL.

I want to check to see if that record contains an assigned value, if not insert a new listItem.

Here's what I have:

[Code]....

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Web Forms :: Dropdownlist SelectedValue Not Changing?

Aug 26, 2010

I have a quick question on my ddl. I have a search page that searches based on the ddl. Once the button is clicked. the result of the search shows on the gridview.Which all works well.Now the problem i am having is that. On my gridview i have a select button that brings out another ddl on an update panel based on the first ddl. When i do this... it goes back to the first record on the ddl and shows a wrong result.. Basically the new ddl is supposed to change on "selectedindexchanged" handler of that gridview which works fine but the selectedvalue is just going back to the first one.

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Web Forms :: How To Set The SelectedIndex Of A DropDownList Based On The SelectedValue

Apr 24, 2010

how do I set the SelectedIndex of a DropDownList based on the SelectedValue

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How To Programatically Set SelectedValue Of Dropdownlist When It Is Bound To XmlDataSource

Feb 25, 2011

I'm using XmlDataSource as the datasource for a dropdownlist. Now I want to set the SelectedValue of the dropdown when the page initially loads. I tried the OnDataBound event of the dropdown in which I could see the total items but setting the SelectedValue didn't work. In OnDataBinding event, I couldn't even see the total items probably because the list isn't bound yet.

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C# - Bind SelectedValue Of DropDownList To Nested Property?

Feb 10, 2010

I have a asp.net FormView with a DropDownList for the selection of a month. The FormView is data bound to an ObjectDataSource.

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I like to bind the selected value to the nested property 'Month' of 'OrderDate' as shown above. The property OrderDate is of type DateTime. The error I'm getting while binding to a nested property is:

A call to Bind was not well formatted. Please refer to documentation for the correct parameters to Bind.

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