VS 2008 Databind With Dropdownlist?
Mar 12, 2011
vb Code:
SqlDataAdapter dd = new SqlDataAdapter("select * from book_store", conn);
DataSet ds;
ds=new DataSet();
dd.Fill(ds);
DropDownList1.DataSource=ds;
DropDownList1.DataValueField = "b_id";
DropDownList1.DataTextField = "b_qty";
I m not able to understand what is datavaluefiled and datatextfield are doing here ...... why i can't bind dropdownlist without these two property and what is is use ?Please provide me link if possible .. I m not able to find the correct keyword for searching
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Jul 10, 2012
I have placed a gridview control with a sqldatasource control in a modal popup window powered by ajax. I do not want the sqldatasource control to databind until I click the button to show the popup. How can I do this? I know how to prevent the sqldatasource from binding using a session such as cancel the selecting if the session is not set.
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Apr 7, 2010
I have a DropDownList in my page, it DataBind with a objectDataSource.
when user select an option base that i have a FormView that show the detail of selected option an it also work with an othere ObjectDataSource.
when user insert, delete or edit an option for example the name of option will in edit mode changed and i need the DropDownList be refresh that show the new name of option.
i alredy know where should i write the code but i don't know how to refresh the DropDownList without dataBind the DropDownList because AppendDataBoundItems="True".
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Jan 21, 2011
Assuming i have two dropdownlists namely: dropdownlistA and dropdownlistB. at page load, i bind values to dropdownlistA. however, depending on the value selected or displayed in dropdownlistA, i want to bind data to dropdownlistB.
Currently, i can bind data to dropdownlistA alright and i already have the required dataset and datatable bind data to dropdownlist. However, dropdownlistB does not bind at page load since the criteria for filling the dataset to bind dropdownlistB (which is the value of dropdownlistA) is not selected. how can i make this wwork.
I am currently considered if this might work. If i were to call the databind for dropdownlistA in a different declared method besides its binding in page load, and select the value from bind in the declared method, would any value be selected?
For example:
In during page load, i call the a method that returns dataset values which i bind to dropdownlistA(caseIDDropDownList). then i call another method (CreateexhibitDataSet()) which contains the dataset values for binding dropdownlistB(exhibitDropDownList). however, i need to define a criteria in the CreateExhibitDataset() method which i will use to generate the dataset values to bind dropdownlistB. if i were to call for the data bind of dropdownlistA(caseIDDropdownList) again in the CreateExhibitDataset() method and pick the value in the dropdown list, would i get any values?
How can i work around this to bind both dropdownlists on page load?
[Code]....
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Jan 12, 2011
This is my setup: I've got a dropdownlist of people and a linkbutton next to it to add a person. the linkbutton makes an update panel appear. When clicking save, I want the data to be saved and the new person be selected in the dropdown. As far as I can tell, I have done this properly. After I save the data I refresh the dropdownlist and take the new person's value and set it as the selected value. When stepping through, it shows the ddl with the new person and the new person selected! BUT, when the page comes back, the ddl is unchanged, ie NOT refreshed. I thought it might be something with the Update Panel but I got a similar setup to work on another page! It also works on a nested Update Panel (not shown in the following code). Can you think of why this "deception" is happening?
Here is some of my code.
[Code]....
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Mar 17, 2011
I'm working on web pages that have an ASP DropDownList defined, and on page load the data source is bound to it through DataSource.DataBind(). When I step through the code, the drop down list does not show anything in it, but when the page actually displays, it does have items in the list. When exactly does DataBind() get applied to the control?
The problem is that some of the values returned by the SQL back end have a null Text, so nothing is displayed in the drop down list for that row. I want to just use the Value as the Text, but only if the Text is null. And when I put the code to loop through and do that right after the DataBind(), there is nothing in the drop down list at that point in the code.
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Feb 15, 2010
I have a complex UserControl with the main purpose to encapsulate DropDownList with a number of properties for advanced manipulation.
List is being populated on PreRender event depending on properties previously were set:
protected void Page_PreRender(object sender, EventArgs e)
{
sourceClient.SelectCommand = this.Property1 ? "exec a" : "exec b";
}
The most used property is ClientID:
[Category("Settings")]
public int ClientID
{
get
{
return Int32.Parse(DropDownList1.SelectedItem.Value);
}
set
{
DropDownList1.Items.FindByValue(value).Selected = true;
}
}
Getter commonly is being called by ControlPameters in SqlDataSources on pages with this control.
Setter - from markup: <uc:UserControl1 runat="server" ClientID='<%# Bind("ID") %>' />.
Why does setter from Bind is called earlier then PreRender? And DropDownList is empty and item selecting doesn't work! How to workaround this behavior?
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Dec 14, 2010
I want to create this scenario: The user selects a school from ddlSchool and this populates ddlStaff with a list of staffs in that school. i knw the codes for sql database but dont know how to do it for oracle.
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Aug 13, 2010
I would rather not magic string my DataTextField/Values on the dropdownlist after setting up the source as a List collection of objects.
I was thinking I could use the DataSource properties but it doesn't seem to like the couple of ways I tried.
WORKS BUT NOT IDEAL
//set the datasource to the returned List<Cart>
this.cartDdl.DataSource = CartManager.Load(WebProfile.Current.UserName);
//set the DataValueField to the Cart.ID property
this.cartDdl.DataValueField = "ID";//would rather use the obj property Cart.ID
//set the DataTextField to the Cart.Description property
this.cartDdl.DataTextField = "Description";//would rather use the obj property Cart.Description
//Bind the ddl to the datasource
this.cartDdl.DataBind();
HOW I WOULD THINK IT COULD WORK this.cartDdl.DataValueField = ((Cart)this.cartDdl.DataSourceObject).ID; this.cartDdl.DataTextField = ((Cart)this.cartDdl.DataSourceObject).Description;
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Oct 29, 2010
I created this generic method to Bind Controls on my ascx:
[Code]....
I cannot use a for cycle, it must be generic to load several DropDownList or CheckBoxLists on my web user control.
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Apr 9, 2010
environment: VS2008 When running below code the DDLKlient.DataBind() appends the whole set of names to the already existing list. I.e. I have 2 sets of names in the DropDownList!Question:? what can I do to prevent appending and just get 1 (one) set of names?? is there any refresh option?
Protected Sub DVKlient_ItemInserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewInsertedEventArgs) Handles DVKlient.ItemInserted
Dim connString As String
[code]...
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Aug 16, 2010
I was wondering, how about can i databind some custom attributes to my Radiobuttonlist / Dropdownlist / Checkboxlist? My existing code as follows:
With Me.ddlOtherApplications
.DataTextField = "ApplicationName" + Me.iSolutions_SysVariables.sys_iLanguage.Replace("-", "")
.DataValueField = "ApplicationID"
.DataSource = dtOtherApplications
.DataBind()
End With
However, I have 2 more additional custom attributes: ApplicationID and ApplicationImgUrl..... how abt do i databind these 2?
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Mar 21, 2010
i'm opening a new window and passing on to it variables in a querystring, the values are loaded into a function that is filling my dataset and then filling my Gridview. after i press the button field in my grid to delete an item, the databind doesn't show the updated grid but remains the same. i've noticed that if i navigate back and refresh i see it correctly. in FF btw no problem.
the code:
this is used to open the new window
[Code]....
[Code]....
[Code]....
[Code]....
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Aug 1, 2013
I have a dropdownlist on my page with dates such as 1/1/2013, 2/1/2013, etc.
Then there is a second ddl.
If the date in ddl #1 is before 1/10/2013 I want to enable ddl #2.
If the date in ddl #1 is on or after 1/10/2013 I want to either disable ddl #2 or hide it (whichever's easier).
Disabling ddl #2 based on the selected date is a new requirement so I am enhancing the existing code. Obviously I want to do this without a postback, but I don't know what is the best way. I am trying to understand what an AsyncPostBackTrigger is because this is the existing code:
Code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:dropdownlist id="EffectiveDateDropDown" runat="server"></asp:dropdownlist>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="QuoteType"
EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
It wants to do something when the selected index is changed? This exists in the code-behind, but I set a breakpoint and never hit it:
Code:
protected void QuoteType_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
}
catch (Exception err)
{
this.PublishError(err);
}
}
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May 7, 2010
Need to substring value from DropDownList from position 1 till I reach the first blank character
Example: 'RGWP - West Palm' would be 'RGWP' and 'SBGB3 - Greensboro' would be 'SBGB3'
mid(DropDownList1.Value, 1, ?)
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Aug 29, 2010
Is it right way to get the selected values in DropDownList
Code:
cmbType.SelectedValue = reader.Item("HeadName")
or Please suggest the right way
I m getting the below error on this line
'cmbType' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
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May 7, 2010
I have a DropDownList being filled from a data base. Now, when I select the drop down arrow, is there a way to set the size of how many lines to show initially ?
Like: DropDownList2.Attributes.Add("Size", "16")
I cannot find an event when clicking the drop down arrow.
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Aug 12, 2010
I found a good article online and am able to read data from an excel file. The excel file I created has two columns which I am populating column A as the dropdownlist text value and column B is the dropdownlist value Here is my code:
page.aspx
HTML Code:
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="ddlFund" runat="server" />
</div>
</form>
page.aspx.vb
Code:
Imports System.Data
Imports System.Data.OleDb
Partial Class read_excel
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim myDataSet As New DataSet()
Dim sXLSfile As String = Server.MapPath("/xls/class-list.xls")
Dim strConn As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & sXLSfile & ";" & _
"Extended Properties=""Excel 8.0;"""
''You must use the $ after the object you reference in the spreadsheet
Dim myData As New OleDbDataAdapter("SELECT * FROM [Fund Project List$]", strConn)
myData.TableMappings.Add("Table", "ExcelFile")
myData.Fill(myDataSet)
ddlFund.DataSource = myDataSet.Tables(0).DefaultView
ddlFund.DataTextField = "group"
ddlFund.DataValueField = "groupval"
ddlFund.DataBind()
End Sub
End Class
the excel file looks something like so (<blank> means no data in cell):
Row 1: group | groupval
Row 2: ITEMS | <blank>
Row 3: Blankets | Blankets
Row 4: Beds | Beds
Row 5: STAFF | <blank>
Row 6: John Doe | John Doe
Currently my dropdown gets populated and it's text listing shows up but I want all the items that do not have a value that is blank to be indented. Anyone know if this can be done? How about if I bold just the text that has a blank value?
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I m using MultiView and View Controls in my site. I have placed some DropDownlists in different Views containing data of YES/NO or some other data. I have put that data manually by Edit Items. But when i run the project my all DropDownList shows empty.
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Jul 12, 2012
I am using SelectedIndexChanged in the DropDowList and it works fine and populates a GridView based upon a site selection.
Is there there a way I can reset the SelectedIndexChanged so if user wants to refresh the GridView they would open the drop down list and click on the same selection again?
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Apr 10, 2013
I need to loop through a gridview and get the values of some dropdownlist controls at that time.I am binding the gridview from a datatable I created.
Code:
gvFields.DataSource = myDataTable
gvFields.DataBind()
Now I am going through the rows of the gridview manually and need to get the values. You can see I have tried different ways. How can I do this from clicking a button to get the values instead of any other event? I only get True or False returned instead of the text in the dropdownlist controls.
Code:
For X = 0 To gvFields.Rows.Count - 1
Dim chkBox As CheckBox = CType(gvFields.Rows(X).Cells(0).Controls(1), CheckBox)
If chkBox.Checked = True Then
Dim ColumnName2 As String = Trim(gvFields.Rows(X).Cells(1).Text)
[code]....
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Sep 9, 2011
I'm using Visual Studio 2008 version 3.5. I have a dropDownList with over 800 names. The user wants to be able to type in it and select the name. I have seen this functionality in Telerik combobox but do not have license. How this functionality can be accoplished?
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Jan 26, 2012
I am populating a DropDownList from a text file (class requirement).
The file is read in the Page_Load method and the DropDownList is populated then.
When I press the Submit button, throughout the process of the code it is supposed to get the SelectedIndex and use it to grab a value out of a List(Of ).
The thing is, nothing is ever passed through. I even setup an alert box and it passes right over the alert box and never even triggers it, but gives me an Index out of range error when it moves to the line right after the Alert.
Code:
Redacted to keep people from stealing classwork.
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<input type='hidden' name='RANDOM[1]' value='aOIR2H5Wf' />
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<p><input class=subject type='text' size='90' name='SUBJECT[1]' value='asp.net - gridview databind' /><select name='INDEXED[1]'><option value='1' selected>UPDATE</option><option value='2'>DELETE</option></select>Jan 15 at 0:33 - Replies: 1 CAT: ASP.NET<a target=_blank href="http://stackoverflow.com/questions/4697329/gridview-databind">View</a></p>
<p> <textarea rows=10 cols=100 name='POST[1]' onfocus='setSelRange(this, 0, 0)'/>,
I'm doing a gridview with an object datasource:
List<MyObject> TheSource = a linq query At some point, I have
MyGridview.DataSource = TheSource;
MyGridview.Databind();
and an OnRowDataBound event handler that's tied to the databinding. In that event handler, how do you make column 2 contain 2 objects from TheSource. For instance, in the TheSource, there is a variable for FirstName and another one for LastName. Column 2 needs to contain both the first and last name in the same cell.
</textarea></p>
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<input type='hidden' name='URL[2]' value='http://forums.asp.net/t/1649188.aspx' />
<input type='hidden' name='CAT[2]' value='Forms Data Controls' />
<input type='hidden' name='BOARD[2]' value='microsoft' />
<input type='hidden' name='P_DATE[2]' value='Feb 03, 2011 01:43 AM' />
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I am using ASP Flash Video Player inside a data list control. and i am trying to bind the video url to a column in a SQL Server that has the url. when I use VideoURL='<%# DataBinder.Eval(Container.DataItem,"video") %>'> Nothing happens but when I use VideoURL="/manager/evideos/VTS_01_0_part3.flv" The video plays both have the same url
Dim MyConnection3 As New Data.SqlClient.SqlConnection("Data Source=XXX")
Dim mydtadapter3 As New Data.SqlClient.SqlDataAdapter("Select title, video from EVideo", MyConnection3)
Dim ds3 As New Data.DataSet
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dl.DataSource = ds3.Tables("video").DefaultView
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<asp:ImageButton ID="ImageButtonGetFlashPlayer" runat="server" PostBackUrl="http://www.adobe.com/go/getflashplayer" ImageUrl="http://www.aspnetflashvideo.com/images/get_flash_player.gif" />
</HTMLAlternativeTemplate>
</ASPNetFlashVideo:FlashVideo>
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