Web Forms :: Databinding A Dropdownlist On The Parent?
Apr 15, 2010
I'm new to asp.net. I have a page with formview to read, edit and insert data to sql server 2008. On the page there are textboxes, dropdownlists. The Dropdownlist1 is bound to a lookup table. I also have a pop-up page to add, delete and update data underlying table. The problem is after i insert a new record to the lookup table and close the pop-up page, rebind the dropdownlist on the parent page. I'm refreshing the page with window.opener.location.href ....
but i want only the refresh the dropdownlist on the parent page.
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Sep 6, 2012
protected void DDLzone1_SelectedIndexChanged(object sender, EventArgs e)
{
BindDistrict();
}
[Code]......
here when i click on ALL item from ddlzone1 it just "ALL" item in ddldistrict
i want when i select "ALL" item from ddlzone1 in ddldistrict14 show all data from database
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Feb 26, 2010
I've got a class that implements IListSource and returns a generic List of ListItem objects (List<ListItem>). in this list one of the ListItems has the Selected attribute set to true.On the web page I have a standard asp:dropdownlist and I set it's datasource to the getList method of my class and databind it.The problem is that the databind seems to loose the selected Item and the first item in the generic list becomes selected.
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Mar 29, 2010
I have a gridview in which I have two drop downs. One is populated with values that are static, so I have a regular sub that does that in the code behind. I tried to add code for databinding the other ddl to a datatable. I cannot get this to work. It just comes up empty. My asp code is fine, and the datatable definately has data in it - just nothing gets populated.
One other thing - the code for the static ddl has worked fine, but when I add this other block (either to the same sub as that, or dow the rowdatabound event) the static one doesn't work either.
[Code]....
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Mar 24, 2010
I am trying to create a Gridview in which I can update the Project Officer name in the Gridview from a DropDownList.
The Project Officer DDL comes from a seperate query (SqlProjectOfficerName) as the other information (SqlDataSource1)... as you can see below.
When I select EDIT, the DDL appears and I can select from the list of Project Officers, but when I select UPDATE, the name of the Project Officer doesnot change.
review the code below and assist as appropriate to write the Project Officer's name back to the table.
[Code]....
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Oct 11, 2010
I have a webForm which host a gridview and a formview. The formview is used for showing/editing a record which the user Select from the gridview.
In the formview Edit template I used DropDownList controls with
SelectedValue='<% bind("datafield")%>'
for enabling the user easier interface. A few of the DropDownList controls need to have a list of 100 items and I want to load the items from code behind and not from the aspx.
I tried to update the DDL's from FormView.Load, FormView.ModeChanging, FormView.PreRender but
nothing I am getting an error like this:
[code]....
How do I load the DropDownList controls with items BEFORE the form databinding occurs.
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Aug 27, 2010
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.
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Dec 23, 2010
Bringing back to life an old post that I dont believe ever got solved: http://forums.asp.net/t/1562245.aspxThis may be an old thread .... but no answer was ever given ... and I too have a radio button list and DDL and am stuck in the EXACT same place. If I check one of the two data bound radio buttons, the DDL should repopulate with a different set of results. This works just fine EXCEPT .... the DDL cannot be databound. If I set SELECTEDVALUE of the control to a bind I get this error:Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.I have followed the advice on this page from various users, all to no avail....surely this can be done, and I assume quite simply. Anyone know the answer?
[Code]....
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Mar 31, 2011
I have a formview that has several dropdownlists in the EditItemTemplate. Some of the dropdownlists are added using placeholders. I can add and populate their listitems without any problem. But when I update the record, none of the controls can be found--even though when I look at the page source they are there. I first strated out using asp:ControlParameter in my sqldatasource updateparameters, but even referencing the control as myform$mycontrol did nothing. So then I moved to code behind on the sqldatasource.updating event (code is attached). The only controls I cannot seem to bind to the update are those added via the placeholder.
[Code]....
The item at the dim statement is not an item added using a placeholder and does not get a null reference exception (I used that to prove during debbugging that I wasn't losing my mind)--however, all the items being used to get the parameter values are getting null reference exceptions and are added via placeholders. Here is the code I'm using to set up the dropdownlists:
[Code]....
how to get the value of these controls so they can be used in my update?
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Jan 8, 2013
I am having two dropdownlist in my project,one dropdownlist for empid, another dropdownlist for month, if the user select the empid, the values are retrieved in the textbox.
In the second dropdownlist, if the user select the month in the dropdownlist it will display the leave details, its all working fine, if the user again select the first dropdownlist that means empid, I want to show the second dropdownlist as select month, how can do this.....
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Jan 6, 2010
have a dropdownlist (ddl2) which is dependent on the selected value of another dropdownlist (ddl1).I have set the appendatabounditems to "true" for ddl2 and have added a "Please Select" and a "Select All" options. The Options show in the list when the page first loads. When ddl1 is selected the page refreshes and ddl2 is populated, however the "Please Select" and "Select All" options have disappeared.
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Sep 24, 2010
Basically when editing an item, I want to bind its ProviderId value to the DropDownList's select value.DropDownList is getting its list of values from other entity entity_List as you can see.
Markup:
<asp:ListView ID="aList" runat="server" OnDataBound="aList_OnDataBound" DataKeyNames="ListServID" DataSourceID="ListServCon" InsertItemPosition="LastItem" selectedvalue='<%# Bind("ProviderID") %>' >
[code]...
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Mar 2, 2010
I have a dropdownlist control in an edititemtemplate for a details view defined like this:
<asp:TemplateField HeaderText="Primary Use">
<EditItemTemplate>
<asp:DropDownList ID="ddlPrimaryUseEdit" runat="server" OnDataBinding="DropDownList_DataBinding"
[code]...
I have a datasource definded as a query to my database that has a column named "PrimaryUse". Sometimes there can be a value in the PrimaryUse column that isn't listed as one of the dropdownlist items and so my application crashes when trying to bind the dropdownlist's selectedvalue to that field. I'm trying to create code in the edititemtemplate's OnDataBinding event that will check if the value being returned from the datasource is a valid value listed as an item in the dropdownlist options. My problem is that I'm not sure how to get the datasources fieldvalue for that column in the behind code. Is this possible? Is so, can some one give me an example or point me in the direction on how to do this?So, in the OnDataBinding event for the edititemtemplate listed above, I would like to do the something like the following (psuedo code):
if datasource.datafieldvalue("PrimaryUse") is in dropdownlist.Items then Valid
else set dropdownlist.Selectedvalue = "Default"
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Oct 22, 2010
I have table menus (menuid int, text nvarchar, description nvarchar, parentid int, menutype int)
menutype= 1: Service
menutype=2: Product
now i want to display parent/child item group by menutype in dropdownlist control? how can i do it?
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Sep 20, 2015
How can I add a Treeview to the DropDownList for show child and parent record..
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Jan 7, 2010
How do I set the selectparameter of Objectdatasource in usercontrol from dropdownlist in parent page?I tried the following but when I select a new value in the dropdownlist it does not change the data from the initial page load
Protected Sub ODSLocations_Selecting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ObjectDataSourceSelectingEventArgs) Handles ODSLocations.Selecting
Dim ntid As DropDownList = CType(Me.Parent.FindControl("DDLEmployees"), DropDownList)
e.InputParameters("ntid") = ntid.SelectedValue
End Sub
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Sep 20, 2015
C#- bind treeview runtime using dataset and data table
simple example
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Jun 25, 2012
I have a web form that contains a dropdownlist which shows list of cities in it. I have an add button on click of which I am opening a Popup window to open a new page that contains a text box where in i am entering new city name and submit button.
I want that after click submit button the window should be closed and on the parent page the dropdownlist gets refreshed with the new value. I am able to do it but the whole page gets postbacked which I do not want. I have added the dropdownlist in the update panel but not able to do the partial postback.
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Nov 2, 2010
I have have 2 DropDownList controls with CascadingDropDown
I need set data to the first dropdownlist on server side if i do this, and when i get page on client side, the first DropDownList without data that i set on server side
//client
<asp:DropDownList ID="ddlAjaxManufacturer" runat="server">
</asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="CascadingDropDownManufacturer" runat="server"
TargetControlID="ddlAjaxManufacturer" Category="Make" PromptText="....." ServicePath="../../Ajax.asmx"
ServiceMethod="GetMakes" />
<asp:DropDownList BackColor="white" ID="ddlAjaxModel" runat="server">
</asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="CascadingDropDownModel" runat="server" TargetControlID="ddlAjaxModel"
ParentControlID="ddlAjaxManufacturer" PromptText="....." ServiceMethod="GetModelsForMake"
ServicePath="../../Ajax.asmx" Category="Model" />
//server
ddlAjaxManufacturer.Items.Add(new ListItem("...", "", true));
ddlAjaxManufacturer.Items.Add(new ListItem("11", "ford", true));
ddlAjaxManufacturer.Items.Add(new ListItem("22", "bmw", true));
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Jan 29, 2010
I want to sum my nested gridview column totals in parent grid's footer.
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Sep 4, 2012
I have a User Control which has a dropdownlist.
Now i want this dropdownlist value in parent page in a label control.
whenever i change dropdownlist value label value should be change.
How can i do it?
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Jan 24, 2010
In my website I have two forms: parent form and child form(dialog box). Their expected behaviour is like this: if clicked on 'show' button on parent form, a dialog form opens that displays a gridview. In dialog form, if clicked on 'select' button it closes
itself and returns value in selected row back to parent form.
To achieve this I write following code (.cs) : in parent form:
void ShowBtn_Click(object sender, EventArgs e)
{
StringBuilder jScript = new StringBuilder(); [code]....
Now problem is: the code in parent .cs works fine, it opens the dialog properly. But when clicked on 'select', instead of returning back to parent, it opens the same dialog again in new window. This newly open window says "Done but error on page" at left bottom.
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Sep 22, 2010
I'm trying to build a webpage without using any asp.net data binding controls ( listview, repeaters etc.)that I'm trying to do is to use stored procedure to get all necessary items, loop through them, and bind to labels, images etc.The problem is when i want to repeat .aspx code. I'm able to do everything i want in c#, but it's really pain to create all the necessary html elements such breaklines, spans, textboxes and so on.I tried to use expression builders, but it only repeats the last value from database.
Here is my code(ASPX):
[Code]....
c# code:
[Code]....
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Oct 10, 2010
I have Wizard steps in a a Wizard control. Each step looks like a form with textboxes and dropdowns for users to complete. I don't want to lose the data as user completes each of the wizard step.
1. I'm thinking about saving user input to sql database when user clicks the next button with each wizard step but I wonder if this is wise since it would create many runs and writes to the server? If not the best way then what method should I use? I just don't want user to lose data if browser crash or for any reason.
2. Or should I use the DataBinding option in the Wizard? Would this be a better performance?
3. Another concern I have is that there are on average about 7, 8 HTML-Server CONTROLS (I added id and Runat="server" to the regular html controls) in a wizard step. If I load up all 7 steps and each step has 8 controls then is that a lot of controls? Wouldn't that affect performance easily when there are a few more users access this web app? Maybe I shouldn't use Wizard for this then? I should just have 7 forms and each form would have Next and Prev buttons that takes users to whatever page they want?
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Feb 1, 2010
In an ascx control, it's possible to expose properties - let's assume the property name is a string property with a get accessor called DataField. If the ascx control contains a bindable templated control like a FormView and the FormView has a template that uses the two-way databinding syntax, why can't you provide a reference to the property in the call to the Bind method? I see that using the Bind method in a databinding expression causes the page parser to generate a method that is something like the following:
public System.Collections.Specialized.IOrderedDictionary @__ExtractValues__control8(System.Web.UI.Control @__container)
In which, I see the following line:
@__table["Some_Field"] = TextBox1.Text;
Now, this method (@__ExtractValues__control8) is an instance member on the same generated class that defines our DataField property, but when page parser goes to compile the control, I receive the following error:A call to Bind was not well formatted. Please refer to documentation for the correct parameters to Bind. I assume from this that the page parser requires a string literal to be provided, but I don't understand why.
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