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I have a DropDownList called ShippingList and when a value is selected, I want to pass that value into the variable simpleCart.shippingFlatRate. I tried creating a var and getting the selected value and then passing that var, but for some reason var shipList remains null (Firebug console). I am new to asp and this is my first time using javascript, so I'm kinda stuck, is this even the simplest/easiest way of passing the value?

<script type="text/javascript">
    simpleCart.email = "[email protected]";
    simpleCart.currency = "EUR";
    simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", "increment_noHeader", "Quantity_input_noHeader", "decrement_noHeader_noHeader", "Remove_noHeader", "Total_noHeader"];
    var shipList = document.getElementById('<%=ShippingList.ClientID%>');
    var shipCost = shipList.options[shipList.selectedIndex].value;
    simpleCart.shippingFlatRate = shipCost;
</script>

EDIT all the markup:

    <%@ Page Title="" Language="C#" MasterPageFile="~/Standardmaster.Master" AutoEventWireup="true" CodeBehind="WebShop.aspx.cs" Inherits="PetShopParadise.Customer_Pages.WebShop" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="mainContent" runat="server">



<script type="text/javascript" src="/simpleCart.js"></script>


    <h2>
        Wele to the Web Shop of 
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
        !</h2>

    <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PetShopParadiseConnectionString %>" 
        SelectCommand="SELECT [Name] FROM [Vendors] WHERE ([VendorID] = @VendorID)">
        <SelectParameters>
            <asp:QueryStringParameter Name="VendorID" QueryStringField="VendID" 
                Type="Decimal" />
        </SelectParameters>
    </asp:SqlDataSource>
    <asp:GridView ID="ProductsGrid" runat="server" AllowSorting="True" 
        DataSourceID="SqlDataSource1" AutoGenerateColumns="False" DataKeyNames="ProductID" >
        <Columns>
            <asp:BoundField DataField="ProductID" HeaderText="ProductID" 
                SortExpression="ProductID" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
            <asp:BoundField DataField="Type" HeaderText="Type" 
                SortExpression="Type" />
            <asp:BoundField DataField="Description" HeaderText="Description" 
                SortExpression="Description" />
            <asp:BoundField DataField="Price" HeaderText="Price" SortExpression="Price" />
            <asp:TemplateField HeaderText="Image">
            <ItemTemplate>
            <a href="javascript:void(window.open('<%# "/FullImage.ashx?ProductID="+ Eval("ProductID")%>','_blank','toolbar=no,menubar=no'))" > <asp:Image ID="Image1" runat="server" ImageUrl='<%# "/Thumbnails.ashx?ProductID="+ Eval("ProductID")  %>'/> </a>
            </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
            <ItemTemplate>
            <a href="javascript:;" onclick="simpleCart.add( 'name=<%# Eval("Name") %>' , 'price=<%# Eval("Price") %>' , 'quantity=1' );">Add To Cart</a>
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

    <br />

    <br />
    <div id="LocationDetails">
        <asp:Label ID="Label2" runat="server" Text="Choose Location"></asp:Label><asp:DropDownList
            ID="ShippingList" runat="server" 
            onselectedindexchanged="ShippingList_SelectedIndexChanged" 
            AutoPostBack="True">
            <asp:ListItem Value="5" Text="Europe"></asp:ListItem>
            <asp:ListItem Value="10">Asia</asp:ListItem>
            <asp:ListItem Value="8">America</asp:ListItem>
            <asp:ListItem Value="12">Africa</asp:ListItem>
            <asp:ListItem Value="15">Rest of the World</asp:ListItem>
        </asp:DropDownList>



 <script type="text/javascript">
        simpleCart.email = "[email protected]";
        simpleCart.currency = "EUR";
        simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", "increment_noHeader", "Quantity_input_noHeader", "decrement_noHeader_noHeader", "Remove_noHeader", "Total_noHeader"];
        var shipList = document.getElementById('<%=ShippingList.ClientID%>');
        var shipCost = shipList.options[shipList.selectedIndex].value;
        simpleCart.shippingFlatRate = shipCost;
    </script>

        <br />
        <asp:Label ID="Label3" runat="server" Text="Shipping Cost"></asp:Label>
        <asp:TextBox
            ID="ShippingCostBox" runat="server"></asp:TextBox>

    </div>

    <div id="cartTotal">
    <strong>Total: </strong> <span class="simpleCart_total"></span></div>

    <div class="simpleCart_items"></div>

    <div class="CartOptions"><a href="javascript:;" class="simpleCart_checkout">Checkout</a>
    <a href="javascript:;" class="simpleCart_empty">Empty</a></div>   



    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PetShopParadiseConnectionString %>" 

        SelectCommand="SELECT [ProductID], [Name], [Type], [Description], [Price], [Image] FROM [Products] WHERE ([VendorIDF] = @VendorIDF)" 
        OldValuesParameterFormatString="original_{0}" 
        ConflictDetection="CompareAllValues" >

        <SelectParameters>


            <asp:QueryStringParameter Type="Int32" 
            Name="VendorIDF" 
            QueryStringField="VendID" />

        </SelectParameters>

    </asp:SqlDataSource>


</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="bannerContent" runat="server">
</asp:Content>

I have a DropDownList called ShippingList and when a value is selected, I want to pass that value into the variable simpleCart.shippingFlatRate. I tried creating a var and getting the selected value and then passing that var, but for some reason var shipList remains null (Firebug console). I am new to asp and this is my first time using javascript, so I'm kinda stuck, is this even the simplest/easiest way of passing the value?

<script type="text/javascript">
    simpleCart.email = "[email protected]";
    simpleCart.currency = "EUR";
    simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", "increment_noHeader", "Quantity_input_noHeader", "decrement_noHeader_noHeader", "Remove_noHeader", "Total_noHeader"];
    var shipList = document.getElementById('<%=ShippingList.ClientID%>');
    var shipCost = shipList.options[shipList.selectedIndex].value;
    simpleCart.shippingFlatRate = shipCost;
</script>

EDIT all the markup:

    <%@ Page Title="" Language="C#" MasterPageFile="~/Standardmaster.Master" AutoEventWireup="true" CodeBehind="WebShop.aspx.cs" Inherits="PetShopParadise.Customer_Pages.WebShop" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="mainContent" runat="server">



<script type="text/javascript" src="/simpleCart.js"></script>


    <h2>
        Wele to the Web Shop of 
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
        !</h2>

    <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PetShopParadiseConnectionString %>" 
        SelectCommand="SELECT [Name] FROM [Vendors] WHERE ([VendorID] = @VendorID)">
        <SelectParameters>
            <asp:QueryStringParameter Name="VendorID" QueryStringField="VendID" 
                Type="Decimal" />
        </SelectParameters>
    </asp:SqlDataSource>
    <asp:GridView ID="ProductsGrid" runat="server" AllowSorting="True" 
        DataSourceID="SqlDataSource1" AutoGenerateColumns="False" DataKeyNames="ProductID" >
        <Columns>
            <asp:BoundField DataField="ProductID" HeaderText="ProductID" 
                SortExpression="ProductID" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
            <asp:BoundField DataField="Type" HeaderText="Type" 
                SortExpression="Type" />
            <asp:BoundField DataField="Description" HeaderText="Description" 
                SortExpression="Description" />
            <asp:BoundField DataField="Price" HeaderText="Price" SortExpression="Price" />
            <asp:TemplateField HeaderText="Image">
            <ItemTemplate>
            <a href="javascript:void(window.open('<%# "/FullImage.ashx?ProductID="+ Eval("ProductID")%>','_blank','toolbar=no,menubar=no'))" > <asp:Image ID="Image1" runat="server" ImageUrl='<%# "/Thumbnails.ashx?ProductID="+ Eval("ProductID")  %>'/> </a>
            </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
            <ItemTemplate>
            <a href="javascript:;" onclick="simpleCart.add( 'name=<%# Eval("Name") %>' , 'price=<%# Eval("Price") %>' , 'quantity=1' );">Add To Cart</a>
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

    <br />

    <br />
    <div id="LocationDetails">
        <asp:Label ID="Label2" runat="server" Text="Choose Location"></asp:Label><asp:DropDownList
            ID="ShippingList" runat="server" 
            onselectedindexchanged="ShippingList_SelectedIndexChanged" 
            AutoPostBack="True">
            <asp:ListItem Value="5" Text="Europe"></asp:ListItem>
            <asp:ListItem Value="10">Asia</asp:ListItem>
            <asp:ListItem Value="8">America</asp:ListItem>
            <asp:ListItem Value="12">Africa</asp:ListItem>
            <asp:ListItem Value="15">Rest of the World</asp:ListItem>
        </asp:DropDownList>



 <script type="text/javascript">
        simpleCart.email = "[email protected]";
        simpleCart.currency = "EUR";
        simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", "increment_noHeader", "Quantity_input_noHeader", "decrement_noHeader_noHeader", "Remove_noHeader", "Total_noHeader"];
        var shipList = document.getElementById('<%=ShippingList.ClientID%>');
        var shipCost = shipList.options[shipList.selectedIndex].value;
        simpleCart.shippingFlatRate = shipCost;
    </script>

        <br />
        <asp:Label ID="Label3" runat="server" Text="Shipping Cost"></asp:Label>
        <asp:TextBox
            ID="ShippingCostBox" runat="server"></asp:TextBox>

    </div>

    <div id="cartTotal">
    <strong>Total: </strong> <span class="simpleCart_total"></span></div>

    <div class="simpleCart_items"></div>

    <div class="CartOptions"><a href="javascript:;" class="simpleCart_checkout">Checkout</a>
    <a href="javascript:;" class="simpleCart_empty">Empty</a></div>   



    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PetShopParadiseConnectionString %>" 

        SelectCommand="SELECT [ProductID], [Name], [Type], [Description], [Price], [Image] FROM [Products] WHERE ([VendorIDF] = @VendorIDF)" 
        OldValuesParameterFormatString="original_{0}" 
        ConflictDetection="CompareAllValues" >

        <SelectParameters>


            <asp:QueryStringParameter Type="Int32" 
            Name="VendorIDF" 
            QueryStringField="VendID" />

        </SelectParameters>

    </asp:SqlDataSource>


</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="bannerContent" runat="server">
</asp:Content>
  • javascript
  • asp
  • drop-down-menu
Share Improve this question edited Jan 17, 2014 at 11:08 Matt asked Dec 1, 2011 at 16:06 MattMatt 3,97016 gold badges53 silver badges73 bronze badges 4
  • Can you post the rest of your markup? This should be close. – jwheron Commented Dec 1, 2011 at 16:12
  • The part where you get a reference to your dropdown is fine. You probably have a different issue somewhere else. – Icarus Commented Dec 1, 2011 at 16:18
  • 1 You can also just say shipList.value instead of shipList.options[shipList.selectedIndex].value – Mike Christensen Commented Dec 1, 2011 at 16:20
  • This script block will have to appear after the ShippingList dropdown is declared in the markup or else it will be null. – kevev22 Commented Dec 1, 2011 at 16:20
Add a ment  | 

2 Answers 2

Reset to default 5

Ensure that this javascript block is called after the ShippingList dropdown is created. You can do this by moving the block below the dropdown in the markup or calling it when the window finishes loading.

Edit

Try this:

<script type="text/javascript">
    window.onload = function() {
        simpleCart.email = "[email protected]";
        simpleCart.currency = "EUR";
        simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", 
                                  "increment_noHeader", "Quantity_input_noHeader", 
                                  "decrement_noHeader_noHeader", "Remove_noHeader", 
                                  "Total_noHeader"];
        var shipList = document.getElementById('<%=ShippingList.ClientID%>');
        var shipCost = shipList.options[shipList.selectedIndex].value;
        simpleCart.shippingFlatRate = shipCost;
    }
</script>

If you use JQuery then in below way you'll get desired output:

$(document).ready(function() {
    simpleCart.email = "[email protected]";
    simpleCart.currency = "EUR";
    simpleCart.cartHeaders = ["Name_noHeader", "Price_noHeader", 
                              "increment_noHeader", "Quantity_input_noHeader", 
                              "decrement_noHeader_noHeader", "Remove_noHeader", 
                              "Total_noHeader"];
    var shipList = document.getElementById('<%=ShippingList.ClientID%>');
    var shipCost = shipList.options[shipList.selectedIndex].value;
    simpleCart.shippingFlatRate = shipCost;
});

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