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JavaScript 表单验证
示例:
<html> <head> <script type="text/javascript"> 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} } } </script> </head> <body> <form action="submitpage.htm" onsubmit="return validate_form(this)" method="post"> Email: <input type="text" name="email" size="30"> <input type="submit" value="Submit"> </form> </body> </html> |
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沙发#
发布于:2018-08-10 22:52
E-mail 验证 下面的函数检查输入的数据是否符合电子邮件地址的基本语法。 意思就是说,输入的数据必须包含 @ 符号和点号(.)。同时,@ 不可以是邮件地址的首字符,并且 @ 之后需有至少一个点号: function validate_email(field,alerttxt) { with (field) { apos=value.indexOf("@") dotpos=value.lastIndexOf(".") if (apos<1||dotpos-apos<2) {alert(alerttxt);return false} else {return true} } } function validate_email(field,alerttxt) { with (field) { apos=value.indexOf("@") dotpos=value.lastIndexOf(".") if (apos<1||dotpos-apos<2) {alert("您填写的邮箱格式有误");return false} else {return true} } } |
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板凳#
发布于:2018-08-10 22:54
下面是连同 HTML 表单的完整代码:
<html> <head> <script type="text/javascript"> function validate_email(field,alerttxt) { with (field) { apos=value.indexOf("@") dotpos=value.lastIndexOf(".") if (apos<1||dotpos-apos<2) {alert(alerttxt);return false} else {return true} } } function validate_form(thisform) { with (thisform) { if (validate_email(email,"Not a valid e-mail address!")==false) {email.focus();return false} } } </script> </head> <body> <form action="submitpage.htm"onsubmit="return validate_form(this);" method="post"> Email: <input type="text" name="email" size="30"> <input type="submit" value="Submit"> </form> </body> </html> |
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