Hello Betty,
I'm wondering whether you're wantting to perform such event/checking every
time before the user submit the form/page or do you want to do such
event/checking whenever the user has changed the selected item in
dropdownlist(html select)?
In both cases, you need to use client side script code. For the first case,
you can add a script handler for html form's onsubmit event. e.g.
<form onsubmit="xxx()">
and in that handler, you can check whether the dropdownlist(or other
element)'s value has been changed(you need to also keep the original value
for compare in the page), and then determine whether to continue the submit
or cancel it and display a alert dialog.
e.g.
=========================
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script type="text/javascript">
function form_submit()
{
if(document.getElementById("flag").value == "1")
{
return true;
}
else
{
alert("need set flag...");
return false;
}
}
function set_flag()
{
document.getElementById("flag").value = "1";
alert(document.getElementById("flag").value);
}
</script>
</head>
<body>
<form id="form1" action="" onsubmit="return form_submit();">
data: <input type="text" value="test" /><br />
<input type="button" value="set flag" onclick="set_flag();" />
<input id="flag" type="hidden" value="0" />
<input type="submit" value="submit button" />
</form>
</body>
</html>
======================================
if it is the second case, you just need to add "onchange" client-side event
for the dropdownlist and do the checking(whether the button has been
clicked) and show alert.
Does this help?
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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