22.3.1. JavaScript表单验证 ¶

02.js表单验证.js

function validate_required(field,alerttxt) {
    with (field) {
        if (value == null || value == "")
        {alert(alerttxt);return false}
        else {return true}

    }
}

function validate_form(thisform) {
    with (thisform) {
        if (validate_required(email,"Email must be filled out!") == false){
            email.focus();
            return false;
        }

    }
}

html测试

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="02.js表单验证.js"></script>
</head>
<body>

<form action="11.复选框.html" onsubmit="return validate_form(this)" method="post">
    Email: <input type="text" name="email" size="30">
    <input type="submit" value="Submit">
</form>

</body>
</html>

22.3.1. JavaScript表单验证¶

22.3.1. JavaScript表单验证 ¶