javaScript表单验证

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>表单验证</title>
    <script type="text/javascript">
        function checkForm(){  //表单验证
            //01.获取用户的输入
          var userName= document.getElementById("userName");
            //02.验证
            if(userName.value==""||userName.value.length<6){
                alert("用户名不能为空！用户名长度不足！");
                return false;
            }
         return  true;
        }
    </script>

</head>
<body>
<form action="#" method="post" onsubmit="return checkForm()">
   <input type="text" name="userName"  id="userName"  placeholder="请输入用户名">
   <input type="submit" value="提交">

</form>

</body>
</html>

01.表单验证小例子

//表单验证
function checkForm(){

    //01.验证用户名
    var userName=getById("userName");
    if(userName.value==""){
        alert("用户名不能为空！")
        userName.focus();  //让文本框获取焦点
        return false;
    }
    //02.验证密码
    var pwd=getById("pwd");
    if(pwd.value.length<6){
        alert("密码不能小于6位！")
        pwd.focus();  //让文本框获取焦点
        return false;
    }
    //03.验证密码和重复密码是否一致
    var repwd=getById("repwd");
    if(repwd.value!=pwd.value){
        alert("两次密码不一致！")
        repwd.focus();  //让文本框获取焦点
        return false;
    }
    //04.验证昵称
    var nickName=getById("nickName");
    if(nickName.value==""){
        alert("昵称不能为空！")
        nickName.focus();  //让文本框获取焦点
        return false;
    }
    //05.验证邮箱
    var email=getById("email");
    if(email.value.indexOf("@")==-1||email.value.indexOf(".")==-1){
        alert("邮箱格式不正确！")
        email.focus();  //让文本框获取焦点
        return false;
    }

}


// 传一个id  返回一个dom对象
function  getById(obj){
    return document.getElementById(obj);
}

02.验证网易通行证01

/**value
 * Created by honglin.jiang on 2014/10/14.
 */
//获取DOM对象
function e(str){
    return document.getElementById(str);
}
//动态添加有样式的内容
//ok_prompt 为提示文字验证正确的className
//error_prompt  为提示文字验证错误时className
//import_prompt  为提示文字提示时className

function appendHtml(obj,str,className){
    obj.innerHTML = str;
    obj.className  = className;
}
//验证表单
function checkForm(){
     //把所有的验证 写成一个数组
    var  ids=["checkUserName()","checkPwd()","checkRepwd()","checkNikeName()","checkTel()","checkEmail()"];
    //定义变量 记录 返回true的方法
    var num=0;
    for(var i=0;i<ids.length;i++){
        if(eval(ids[i])){
            num++;
        }
    }
    //所有的验证都通过  才是表单提交
    return (ids.length==num)?true:false;

}
//获得鼠标时触发的事件
//import_prompt  为提示文字提示时className
function focusShow(inputId,msg){
   var  dom  =e(inputId);  //获取dom对象
    var  dmsg  =e(inputId+"Id"); //获取提示信息的dom对象
    dmsg.style.borderColor="green";
    appendHtml(dmsg,msg,"import_prompt");
}
//验证用户名输入
function checkUserName(){
    var  flag=false;
     var  userName= e("userName");
     var  userNameId= e("userNameId");
    if(userName.value==""){
        userName.style.borderColor="red";
        appendHtml(userNameId,"用户名不能为空","error_prompt");
    }else{
        userName.style.borderColor="green";
        appendHtml(userNameId,"输入正确","ok_prompt");
        flag=true;
    }
  return flag;
}

//验证密码
function checkPwd(){
    var  flag=false;
    var  pwd= e("pwd");
    var  pwdId= e("pwdId");
    if(pwd.value==""){
        pwd.style.borderColor="red";
        appendHtml(pwdId,"密码不能为空","error_prompt");
    }else{
        pwd.style.borderColor="green";
        appendHtml(pwdId,"输入正确","ok_prompt");
        flag=true;
    }
    return flag;
   
}
//验证重复密码
function checkRepwd(){
    var flag = true;
    var odom = e("repwd");//输入框DOM对象
    var omsg = e("repwdId");//信息提示DOM对象
    if(odom.value == ""){
        odom.style.borderColor = "red";
        appendHtml(omsg,"确认密码不能为空","error_prompt");
        flag =  false;
    }else if(odom.value !=  e("pwd").value){
        odom.style.borderColor = "red";
        appendHtml(omsg,"两次输入的密码不一致","error_prompt");
        flag =  false;
    } else{
        odom.style.borderColor = "green";
        appendHtml(omsg,"输入正确","ok_prompt");
        flag =  true;
    }
    return flag;
}

//验证昵称
function checkNikeName(){
    var flag = true;
    var odom = e("nickName");//输入框DOM对象
    var omsg = e("nickNameId");//信息提示DOM对象
    if(odom.value == ""){
        odom.style.borderColor = "red";
        appendHtml(omsg,"昵称不能为空，请输入昵称","error_prompt");
        flag =  false;
    }else{
        odom.style.borderColor = "green";
        appendHtml(omsg,"输入正确","ok_prompt");
        flag =  true;
    }
    return flag;
}

//验证手机
function checkTel(){
    var flag = true;
    var odom = e("tel");//输入框DOM对象
    var omsg = e("telId");//信息提示DOM对象
    if(odom.value == ""){
        odom.style.borderColor = "red";
        appendHtml(omsg,"关联手机号码不能为空，请输入关联手机号码","error_prompt");
        flag =  false;
    }else{
        odom.style.borderColor = "green";
        appendHtml(omsg,"输入正确","ok_prompt");
        flag =  true;
    }
    return flag;
}
//验证邮箱
function checkEmail(){
    var flag = true;
    var odom = e("email");//输入框DOM对象
    var omsg = e("emailId");//信息提示DOM对象
    if(odom.value == ""){
        odom.style.borderColor = "red";
        appendHtml(omsg,"保密邮箱不能为空，请输入保密邮箱","error_prompt");
        flag =  false;
    }else if( odom.value.indexOf("@")==-1  || odom.value.indexOf(".")==-1 ){
        odom.style.borderColor = "red";
        appendHtml(omsg,"邮件格式必须包含@和.","error_prompt");
        flag =  false;
    }else{
        odom.style.borderColor = "green";
        appendHtml(omsg,"输入正确","ok_prompt");
        flag =  true;
    }
    return flag;
}

03.网易通行证即时验证

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>正则表达式</title>
    <script  type="text/javascript">
   function  checkForm(){
       var userName=  document.getElementById("userName");
       //书写正则表达式  用户名只能是字母或者数字并且在4到16个长度  包含4,16
       var reg="^[a-zA-Z0-9]{4,16}$";
      //var reg1="^[a-zA-Z0-9]?$";
       var regExp=new RegExp(reg);
       alert( regExp.test(userName.value)?"用户名正确":"不匹配");
   }
    </script>
</head>
<body>
<form onsubmit="return checkForm()">
<input type="text" name="userName" id="userName">
    <input  type="submit"  value="验证">
</form>
</body>
</html>

04.正则表达式验证用户名

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>正则验证邮箱</title>
    <script  type="text/javascript">
   function  checkForm(){
       var email=  document.getElementById("email");
       //书写正则表达式 邮箱
       var reg=/^\w+@\w+(\.\w+){1,2}$/;
       var regExp=new RegExp(reg);
       alert( regExp.test(email.value)?"邮箱正确":"不匹配");
   }
    </script>
</head>
<body>
<form onsubmit="return checkForm()">
<input type="text" name="email" id="email">
    <input  type="submit"  value="验证">
</form>
</body>
</html>

05.正则验证邮箱

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>正则验证手机号</title>
    <script  type="text/javascript">
   function  checkForm(){
       var phone=  document.getElementById("phone");
       //书写正则表达式  手机
       var reg=/^(13|14|15|17|18)\d{9}$/;
       var regExp=new RegExp(reg);
       alert( regExp.test(phone.value)?"手机号正确":"不匹配");
   }
    </script>
</head>
<body>
<form onsubmit="return checkForm()">
<input type="text" name="phone" id="phone">
    <input  type="submit"  value="验证">
</form>
</body>
</html>

06.正则验证手机号

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>正则与String对象</title>
    <script  type="text/javascript">
          window.onload=function(){
              var str="this  is a big dog!";
              //alert(str.match(/big/));查找 str 字符串中的 "big" 字符串
              //alert(str.search(/i/));查找   str 字符串中的 "i" 字符串所在的位置
              //alert(str.replace(/i/g,"I"));把str字符串中的  i  字符替换成  大写的  I 字符
              //alert(str.replace("i","I"));
              //alert(str.split(" ")); 把str字符串中的按空格进行分割 返回数组
              alert(str.split(/\s+/));
          }
    </script>
</head>
<body>
</body>
</html>

07.正则与String对象

posted @ 2017-06-29 14:31 想太多先森阅读(132) 评论(0) 编辑收藏举报

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javaScript表单验证

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