javascript function in jsp page

2019-06-08 07:29发布

站内问答 / JavaScript
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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 ?

3条回答
We Are One
2楼-- · 2019-06-08 07:46

Try

onsubmit="return checkForm();"
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3楼-- · 2019-06-08 08:09

You should replace

onsubmit="checkForm"

By

onsubmit="return checkForm();"
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Anthone
4楼-- · 2019-06-08 08:12

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.

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