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<html> <head> <script type= "text/javascript" > function show() { //弹出一个提示框 window.alert( "hh" ); } //将show方法绑定到按钮上 window.onload= function () { //定位到按钮 var buttonElement=document.forms[0].mybtn; //动态绑定show方法 buttonElement.onclick=show; //show如果加()则一加载网页就弹出提示框 } function validateForm() { var loginform=document.forms[1]; var username=trim(loginform.username.value); var password=trim(loginform.password.value); var email=trim(loginform.email.value); // alert("替代前长度:"+username.length); // username=trim(username); // alert("替代后长度:"+username.length); //判断用户名必填: if (username.length==0) { alert( "用户必填" ); } else if (!/^[a-zA-Z0-9]+$/.test(username)) { alert( "用户名必须是英文字母" ); } else if (password.length==0) { alert( "密码必填" ); } else if (!/^[0-9]{6}$/.test(password)) { alert( "密码必须为6位数字" ); } else if (email.length==0) { alert( "邮箱必填" ); } else if (!/^\w+@\w+(\.\w+)+$/.test(email)) { alert( "邮箱格式不正确" ); } return false ; } //自定义一个去空格的参数 function trim(s) { //s.REPLACE(正则表达式,替换的字符) s=s.replace(/^\s*$/, "" ); return s; } </script> <style type= "text/css" > .myclass{ position: absolute; left: 400px; top: 150px; } </style> </head> <body> <div class= "myclass" > <form action= "#" name= "myform" method= "post" > <input type= "button" value= "单机" name= "mybtn" /> </form> </div> <!--登录页面的表单--> <form action= "#" name= "loginform" method= "post" onsubmit= "return validateForm()" > <table border= "1" align= "center" > <caption>基于js的验证</caption> <tr> <th>用户名:</th> <td><input type= "text" name= "username" /></td> </tr> <tr> <th>密码:</th> <td><input type= "password" name= "password" /></td> </tr> <tr> <th>邮箱:</th> <td><input type= "text" name= "email" /></td> </tr> <tr> <td align= "center" colspan= "2" > <input type= "submit" value= "提交" /> </td> </tr> </table> </form> </body> </html> |
以上所述是小编给大家介绍的用JavaScrip正则表达式验证form表单的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://blog.csdn.net/boxyuan/article/details/72620930