问题
I have jsp page -
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<legend>Create new customer</legend>
<script Language="JavaScript">
function checkForm() {
alert("YOU ARE IN checkForm FUNCTION !");
return (false);
}
</script>
<form action="CreateCustomerServlet" method="GET" onsubmit="checkForm">
// form fields ...
<input type="submit" value="Create customer" />
</form>
</body>
</html>
When I run on server this page and press on the submit button I see that it ignore checkForm and don't enter him , and directly go to CreateCustomerServlet .
My goals is that when press on submit it go to checkForm and if checkForm returns true only then it will go to CreateCustomerServlet . what I have to change in order to get this goal ?
回答1:
Try
onsubmit="return checkForm();"
回答2:
You should replace
onsubmit="checkForm"
By
onsubmit="return checkForm();"
回答3:
You should use
onsubmit="return checkForm();"
because only when false is returned from onSubmit will it be stopped , or else it will continue submitting the form.
来源：https://stackoverflow.com/questions/11792682/javascript-function-in-jsp-page