psot back

[Roger]

Hi
If anyone can help

Is there away to make javascript prevent a postback on a button,
i have tried putting the button in a <spantag with onclick but it carrys
out the javascript functioon and then posts back even if i use return false;

I want javascript to do clientside valudation before posting back

cheers in advance

Roger

[Mark Rae [MVP]]

"Roger" <ro********@btinternet.comwrote in message
news:AE**********************************@microsof t.com...

Is there away to make javascript prevent a postback on a button,
i have tried putting the button in a <spantag with onclick but it carrys
out the javascript functioon and then posts back even if i use return
false;

I want javascript to do clientside valudation before posting back

<script type="text/javascript">
function validateForm()
{
if (...validation condition fails...)
{
alert('Validation failed');
return false;
}
</script>

<asp:Button ID="MyButton" runat="server" Text="Save" OnClick="MyButton_Save"
OnClientClick="return validateForm();" />
--
Mark Rae
ASP.NET MVP
http://www.markrae.net

[Roger]

thanks very much simple really :)
"Mark Rae [MVP]" <ma**@markNOSPAMrae.netwrote in message
news:%2****************@TK2MSFTNGP05.phx.gbl...

"Roger" <ro********@btinternet.comwrote in message
news:AE**********************************@microsof t.com...

>Is there away to make javascript prevent a postback on a button,
i have tried putting the button in a <spantag with onclick but it
carrys out the javascript functioon and then posts back even if i use
return false;

I want javascript to do clientside valudation before posting back

<script type="text/javascript">
function validateForm()
{
if (...validation condition fails...)
{
alert('Validation failed');
return false;
}
</script>

<asp:Button ID="MyButton" runat="server" Text="Save"
OnClick="MyButton_Save" OnClientClick="return validateForm();" />
--
Mark Rae
ASP.NET MVP
http://www.markrae.net