how to pass additional parameter to CascadingDropDown?

WebSpider 76 Reputation points
2021-07-09T09:03:10.02+00:00

below is my code, how can i pass Label1.text to CascadingDropDown?

<asp:DropDownList ID="ddl_category_parent" runat="server"></asp:DropDownList>                                                               
<cc1:CascadingDropDown ID="cdd_category_parent" runat="server" Enabled="false" category="ParentCat" loadingtext="loading..." 
 promptvalue="Select a parent category" servicemethod="GetParentCategory"
 servicepath="/webservices/category.asmx" targetcontrolid="ddl_category_parent">
</cc1:CascadingDropDown>


    <WebMethod()> _
    Public Function GetParentCategory(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()

        Dim values As New List(Of CascadingDropDownNameValue)()
        Dim parent_cat_name As String

        Dim keyword as String = xxxxxx (Label1.text)

        DT = DBcategory.return_category_detail("Status", "Admin", keyword, "Product", "parent", "", "Active", "")

        For x As Integer = 0 To DT.Rows.Count - 1
            parent_cat_name = DT.Rows(x).Item("name1").ToString
            values.Add(New CascadingDropDownNameValue(HttpUtility.HtmlDecode(parent_cat_name), DT.Rows(x).Item("ID")))
        Next

        Return values.ToArray()

    End Function
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  1. Yijing Sun-MSFT 7,061 Reputation points
    2021-07-12T03:28:08.477+00:00

    Hi @WebSpider ,
    As far as I think,you could use the ContextKey to pass the additional parameter.You need to do like this:

    1. Set UseContextKey property on the CascadingDropDown to true
    2. Change the method signature of your webmethod to accept the contextKey parameter:
      • Public Function GetParentCategory(ByVal knownCategoryValues As String, ByVal category As String,ByVal contextKey As String) As CascadingDropDownNameValue()
    3. Set the ContextKey using JavaScript/Jquery. The AJAX CascadingDropDown exposes getter/setter for this property in the DOM:
      • document.getElementById('Label1').set_contextKey('valueyouwant');
      Just like this: <asp:DropDownList ID="ddl_category_parent" runat="server" o nchange="CategoryChanged()"></asp:DropDownList>
      <cc1:CascadingDropDown ID="cdd_category_parent" runat="server" Enabled="false" category="ParentCat" loadingtext="loading..."
      promptvalue="Select a parent category" servicemethod="GetParentCategory"
      servicepath="/webservices/category.asmx" targetcontrolid="ddl_category_parent">
      </cc1:CascadingDropDown>

    Javascript:

    <s cript type="text/javascript">  
        function CategoryChanged() {  
           $find('<%=Label1.ClientID%>').set_contextKey($get("<%=Label1.ClientID %>").value);  
        }  
    </script>  
    

    Code-behind:

     <WebMethod()> _  
                 Public Function GetParentCategory(ByVal knownCategoryValues As String, ByVal contextKey As String) As CascadingDropDownNameValue()  
                ......  
                End Function  
    

    Best regards,
    Yijing Sun


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