Web Forms :: Dropdown Value Used To Filter Another Dropdown Inside A Gridview?
Jun 11, 2010
I'm having a problem with using a dropdown to filter the contents of another drop down. The basic idea is:
Dropdown 1 = CountryList (Column1)
Dropdown 2 = StateList (Column2)
I read the contents of a CSV file and populate the gridview. The user then visually verifies that the data is valid and proceeds to upload to the database. To do some testing, i have intentionally changed spellings of country names so they DO NOT match the countrylist which the grid view then flags with a different background indicating bad data. The user then edits the gridview. The Country and state columns then show a drop down control populated with the country list and filtered states list based on countryID.
Here's the ASP.NET ASPX Source for the section of code that is dealing with the gridview
[Code]....
Here's the section of VB Code behind that deals with handling the "RowEditing", specifically the binding of the dropdowns
[Code]....
The proglem is that these dropdowns are ment to easily fix minor errors in data. When i intentionally changed the spelling of "Canada" to Canadaa", this has no corresponding CountryID in the table and the ddlEdtStateID Dropdown's datasource filter does not work. I tried setting the datasource to nothing if a valid CountryID was not there and then i tried to use the SelectedIndexChanged event for the ddlEditCountryID to programmatically set the datasourceID for ddlEditStateID but when i try using CType(FindControl("ddlEdtStateID"), DropDownList) to set the DataSourceID, it does not find the control.
If the Country does not exist, then i just want the stateslist dropdown to say "select a country" but when a valid country is selected, it should display the filtered list for that countryID. Right now, if bad data is entered for the country, then the program crashes when it tries to populate the state drop down. I want it to just say, select a country when the countryID is not valid.
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[Code]....
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[Code]....
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[code]....
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Here is an example of how the UI might look like:
See the Exchange Management Console image:
[URL]
Here is the spec:
The ASP.NET page has a "Filter" component and a "Apply Filter" button. The "Filter" component consists of 4 UI controls as below:
1. A dropdown list with prepopulated values like "Name", "Department", "Building", "Email Address".
2. A dropdown list with four operators - "Equal", "Not Equal", "Like", and "Not Like"
3. This is a dynamic control. It could be a textbox or a dropdown list. If the user chooses "Name" from the first UI control, the third UI control will become a Textbox. If the user chooses "Department" from the first UI control, the third UI control will become a dropdown list with all departments within this company pre-populated.
4. A button with AND expression. If the user clicks this button, one more Filter component will be created.
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ASP.NET: when the page is loaded, it displays one Filter component (3 UI controls and a AND button), a "Apply Filter" button, and an empty "Filter Result" data grid.
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