asp.net c# and Javascript

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I have dropdown control in asp.net C#. Which is below.

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<td style="text-align: left">
                                               <asp:DropDownList ID="ddlCurrencyUnit" runat="server" CssClass="textarea" Width="65px" AutoPostBack="True" OnSelectedIndexChanged="ddlCurrencyUnit_SelectedIndexChanged">
                                                   <asp:ListItem Value="INR" Selected="True">INR</asp:ListItem>
                                                   <asp:ListItem Value="USD">USD</asp:ListItem>
                                                   <asp:ListItem Value="EURO">EURO</asp:ListItem>
                                               </asp:DropDownList>
                                               <asp:TextBox ID="txtCurrencyConversationAmt" runat="server" CssClass="textarea" Width="50px"></asp:TextBox>
                                           </td>

I want to visible true my textbox if my Dropdown value is not INR using Javascript

Posted 24-Sep-13 1:06am

viralchauhan

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Thomas ktg · Answer 1 · 2013-09-24T01:52:00

Try like this.

HTML

<script type="text/javascript">
function makeVisible()
{
    var value = document.getElementById("ddlCurrencyUnit").options[document.getElementById("ddlCurrencyUnit").selectedIndex].value;

    //do something with the value
    if(value=="INR")
      document.getElementById("txtCurrencyConversationAmt").style.display = 'none';
    else
      document.getElementById("txtCurrencyConversationAmt").style.display = '';
}
</script>

call the function on onchange

ASP.NET

<asp:DropDownList ID="ddlCurrencyUnit" OnChange="makeVisible();" runat="server">
.
.
</asp:DropDownList>

bitofweb · Answer 2 · 2013-09-24T03:04:00

Hi Viral,

The solution I am giving to you is in jquery.

Sample Code:
Asp Code:

ASP.NET

<asp:dropdownlist id="ddlCurrency" runat="server" xmlns:asp="#unknown">
    <asp:listitem text="INR" value="0"></asp:listitem>
    <asp:listitem text="US Dollar" value="1"></asp:listitem>
    <asp:listitem text="Pound" value="3"></asp:listitem>
    <asp:listitem text="Yen" value="4"></asp:listitem>
 </asp:dropdownlist>
 <asp:textbox id="txtHideMe" runat="server" xmlns:asp="#unknown"></asp:textbox>

jquery code:

JavaScript

<script type="text/javascript" language="javascript">
        $(document).ready(function ()
        {
            $("select[id$='ddlCurrency']").change(function ()
            {
                var value = this.value;
                var txtHideMe = $("input[id$='txtHideMe']");
                if (value == 0)//i.e INR
                {
                    txtHideMe.css({ 'display': 'none' });
                }
                else
                {
                    txtHideMe.css({ 'display': 'block' });
                }
            });
        });
    </script>

Hope this helps!

asp.net c# and Javascript

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