checkbox list item selected then show dropdown list visible using javascript

Question

4.00/5 (1 vote)

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XML

<asp:CheckBoxList ID="AllowencesCheckbox" runat="server" AutoPostBack="true" "">
                                           <asp:ListItem Text="hi" Value="1"></asp:ListItem>
                                           <asp:ListItem Text="hello" Value="2"></asp:ListItem>
                                       </asp:CheckBoxList>

XML

<asp:DropDownList ID="MileageRateDropDownList" runat="server" 
                                           Visible="false">
                                        </asp:DropDownList>

here if i select "hi" then MileageRateDropDownListis set to visible true using javascript

Posted 11-Mar-13 0:52am

pothireddy575

Updated 11-Mar-13 1:21am

v4

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pradiprenushe · Answer 1 · 2013-03-11T01:43:00

Try this code

In code behind

C#

protected void Page_Load(object sender, EventArgs e)
    {
        foreach (ListItem item in AllowencesCheckbox.Items)
        {
            if (item.Value == "1")
            {
                item.Attributes.Add("onchange", "Display(document.activeElement.checked);");   
            }
        }
    }

In design

JavaScript

<script type="text/javascript" language="javascript">

        function Display(val) {

            var objDDL = document.getElementById('<%= MileageRateDropDownList.ClientID %>');

            if (val == false) {
                objDDL.style.display = "none";
                objDDL.style.visibility = "hidden";
            }
            else {
                objDDL.style.display = "block";
                objDDL.style.visibility = "visible";
            }
        }
    </script>

ASP.NET

<asp:checkboxlist id="AllowencesCheckbox" runat="server" autopostback="false" xmlns:asp="#unknown">
        <asp:listitem text="hi" value="1"></asp:listitem>
        <asp:listitem text="hello" value="2"></asp:listitem>
    </asp:checkboxlist>
    <asp:dropdownlist id="MileageRateDropDownList" runat="server" xmlns:asp="#unknown">
    </asp:dropdownlist>

nrgjack · Answer 2 · 2013-03-11T01:52:00

i would remove the Visible="false" of the ddl to manage visibility only js side (jQuery)

JavaScript

$(document).ready(function() {
    // hide dropdownlist
    $('select#"<%=MileageRateDropDownList.ClientID%>"').hide();
    
    // loop checkboxes cheched
    $('input[id*="AllowencesCheckbox"]:checked').each(function() {
      
      // if "hi" 
      if($(this).val() == "1")  // not sure, try 1 or "1"
      {
        // show
        $('select#"<%=MileageRateDropDownList.ClientID%>"').show();
      }
    });
   
});

NOTE it's untested..

you can replace show with .slideDown() may be is cuter :)

checkbox list item selected then show dropdown list visible using javascript

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