[code]
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>previous form submit</title>
<script type="text/javascript">
posted = false;
function submitForm(form)
{
form.submit();
}
/**
* This is a form submit interceptor.
* In order to avoid duplicate submitting error, it will check posted flag. if posted flag is still false, will set it to true.
* Usage:
* <body οnlοad="formSubmitInterceptor();">
* @author yangjincheng
*/
function formSubmitInterceptor()
{
var forms = document.getElementsByTagName("form");
if(!forms.length)
{
//if no form tag exists.
return;
}
for(var i = 0; i < forms.length; i++)
{
form = forms[i];
form.preFormSubmit = form.submit;
form.submit = function(){
if(typeof posted == "undefined")
{
alert("You must define variable: posted !!!");
return;
}
if(posted)
{
alert("form is submitted!");
return;
}
//1: When form submit, if posted is still false, set it to true.
if(!posted)
{
posted = true;
}
//2: Then submit form.
alert("Previous submit, you can add your code here...");
form.preFormSubmit();
}
}
}
</script>
</head>
<body οnlοad="formSubmitInterceptor();">
<form action="http://wwww.google.com" method="get" enctype="application/x-www-form-urlencoded">
<input name="name1" />
<input name="name2"/>
<input type="button" οnclick="submitForm(this.form);" value="提交">
</form>
</body>
</html>
[code]
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