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6.8

Dynamically add SelectedIndexChanged to DropDownList

Asked by AWSHelpdesk in Programming for ASP.NET

In my code for a page I am looping through some items and their children in our database and dynamically creating DropDownLists.

I was wondering how I could go about adding a SelectedIndexChanged  to these DDL's?

Code for the setup of the DDL's and their items is below 
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Private Sub repSearchFilters_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles repSimpleWineSearchFilters.ItemDataBound
        Dim ddlFilter As DropDownList
        Dim lblSearchHeading As Label
 
        Dim taxon As CMDotNet.Common.Taxon.Taxon
        Dim repItem As Catalog.ShopTaxonomyFilters
        If e.Item.ItemType = ListItemType.Item Or ListItemType.AlternatingItem Then
            ddlFilter = e.Item.FindControl("ddlFilter")
            lblSearchHeading = e.Item.FindControl("lblSearchHeading")
            repItem = CType(e.Item.DataItem, Catalog.ShopTaxonomyFilters)
            taxon = CMDotNet.Common.Taxon.TaxonDAL.Instance.GetTaxon(repItem.TaxonomyID)
 
            If Not taxon Is Nothing Then
                If taxon.blnInUse Then
                    lblSearchHeading.Text = taxon.name & "..."
                    ddlFilter.Items.Add(New ListItem("please select", "none"))
                    'If taxon.name = "White" Then
                    Dim ParentName As String = taxon.parent_name
                    ddlFilter.Attributes.Add("SelectedIndexChanged", "ddlFilter_SelectedIndexChanged(" + ParentName + ")")
                    'End If
                    PopulateChildTaxonomy(ddlFilter, repItem.TaxonomyID, "..")
                End If
            End If
 
        End If
    End Sub
 
    Private Sub PopulateChildTaxonomy(ByVal ddlFilter As DropDownList, ByVal parentTaxonID As Integer, Optional ByVal separator As String = "")
        Dim subTaxon As CMDotNet.Common.Taxon.Taxon
        Dim subTaxonColl As CMDotNet.Common.Taxon.TaxonCollection
 
        subTaxonColl = CMDotNet.Common.Taxon.TaxonDAL.Instance.GetOnParent(parentTaxonID)
        For Each subTaxon In subTaxonColl
 
            If subTaxon.blnInUse Then
                ddlFilter.Items.Add(New ListItem(separator + subTaxon.name, subTaxon.taxon_id))
                PopulateChildTaxonomy(ddlFilter, subTaxon.taxon_id, separator + "..")
            End If
        Next
    End Sub
[+][-]08/17/09 11:46 PM, ID: 25120585Accepted Solution

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Zone: Programming for ASP.NET
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Solution Provided By: paololabe
Participating Experts: 3
Solution Grade: B
 
[+][-]08/16/09 11:01 PM, ID: 25111891Expert Comment

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[+][-]08/16/09 11:29 PM, ID: 25111958Expert Comment

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[+][-]08/16/09 11:54 PM, ID: 25112025Author Comment

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[+][-]08/17/09 12:28 AM, ID: 25112167Expert Comment

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[+][-]08/17/09 02:26 AM, ID: 25112610Expert Comment

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[+][-]08/17/09 04:25 PM, ID: 25119221Author Comment

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[+][-]08/17/09 04:32 PM, ID: 25119243Author Comment

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