ASP.NET client side code

Consider you have 3 Divs & Buttons for displaying message based on your condition

<div id="divMessage1">Message1</div>
<div id="divMessage2">Message2</div>
<div id="divMessage3">Message3</div>
<input type="button" value="Button1" onclick="fnDisplayMessage(1)" />
<input type="button" value="Button2" onclick="fnDisplayMessage(2)" />
<input type="button" value="Button3" onclick="fnDisplayMessage(3)" />

Here javascript for Show/Hide Divs using if else condition

<script type="text/javascript">
function fnDisplayMessage(MessageID){
    if (MessageID == 1){
        document.getElementById("divMessage1").style.display="block";
        document.getElementById("divMessage2").style.display="none";
        document.getElementById("divMessage3").style.display="none";
    } else if (MessageID == 2){
        document.getElementById("divMessage1").style.display="none";
        document.getElementById("divMessage2").style.display="block";
        document.getElementById("divMessage3").style.display="none";
    } else if (MessageID == 3){
        document.getElementById("divMessage1").style.display="none";
        document.getElementById("divMessage2").style.display="none";
        document.getElementById("divMessage3").style.display="block";
}
</script>

Hope it will help you. BTW next time please include all details completely & code(which you have tried) in your question because it will help you to get solution quickly.

The below code demonstrates hiding or setting visibility of TextBox or button based on certain criteria.


[If you have a drop down list and on select of first index if you want to hide Submit Button and on select of second index you want to hide textbox. Then use the beolw code]



function ToConfirm() {

var selected = document.getElementById('<%=ddlMailSmsType.ClientID%>').selectedIndex;

if(selected==0)
{
document.getElementById('<%=txtboxNum.ClientID%>').style.display = "block";
}
else
{
document.getElementById('<%=btnSubmit.ClientID%>').style.display = "none";
}


Call the Javascript function on click of any event or as per your requirment.

Hope this will help you.

Thanks and regards
Praveen