javascript制作的简单注册模块表单验证

一个注册框  进行表单验证处理

如图

有简单的验证提示功能

代码思路也比较简单

输入框失去焦点时便检测，并进行处理

表单具有 onsubmit = "return check()"行为，处理验证情况

点击提交表单按钮时，进行最终的验证，达到是否通过表单提交的请求。

先是最基本的html+css部分

 
   body{margin:0;padding: 0;}
   .login{position:relative;margin:100px auto;padding:50px 20px;width: 350px;height: 200px;border:1px solid #333;}
   .login legend{font-weight: bold;color: green;text-align: center;}
   .login label{display:inline-block;width:130px;text-align: right;}
   .btn{height: 30px;width:100px;padding: 5px;border:0;background-color: #00dddd;font-weight: bold;cursor: pointer;float: right;}
   input{height: 20px;width: 170px;}
   .borderRed{border: 2px solid red;}
   img{display: none;}
 
 
 
   
     
   

然后是js的class相关处理函数

  function hasClass(obj,cls){  // 判断obj是否有此class
    return obj.className.match(new RegExp('(\s|^)' + cls + '(\s|$)'));
  }
  function addClass(obj,cls){ //给 obj添加class
    if(!this.hasClass(obj,cls)){ 
      obj.className += " "+cls;
    }
  }
  function removeClass(obj,cls){ //移除obj对应的class
    if(hasClass(obj,cls)){ 
      var reg = new RegExp('(\s|^)' + cls + '(\s|$)');
      obj.className = obj.className.replace(reg," ");
    }
  }

然后是验证各个输入框的值

 function checkName(name){  //验证name
    if(name != ""){ //不为空则正确，当然也可以ajax异步获取服务器判断用户名不重复则正确
      removeClass(ele.name,"borderRed"); //移除class
      document.images[0].setAttribute("src","./img/gou.png"); //对应图标
      document.images[0].style.display = "inline"; //显示
      return true;
    }else{ //name不符合
      addClass(ele.name,"borderRed"); //添加class
      document.images[0].setAttribute("src","./img/gantan.png"); //对应图标
      document.images[0].style.display = "inline"; //显示
      return false;
    }
  }
  function checkPassw(passw1,passw2){ //验证密码
    if(passw1 == "" || passw2 == "" || passw1 !== passw2){ //两次密码输入不为空且不等 不符合
      addClass(ele.password,"borderRed");
      addClass(ele.R_password,"borderRed");
      document.images[1].setAttribute("src","./img/gantan.png");
      document.images[1].style.display = "inline";
      document.images[2].setAttribute("src","./img/gantan.png");
      document.images[2].style.display = "inline";
      return false;
    }else{  //密码输入正确
      removeClass(ele.password,"borderRed");
      removeClass(ele.R_password,"borderRed");
      document.images[1].setAttribute("src","./img/gou.png");
      document.images[1].style.display = "inline";
      document.images[2].setAttribute("src","./img/gou.png");
      document.images[2].style.display = "inline";
      return true;
    }
  }
  function checkEmail(email){  //验证邮箱
    var pattern = /^([.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/; 
    if(!pattern.test(email)){ //email格式不正确
      addClass(ele.email,"borderRed");
      document.images[3].setAttribute("src","./img/gantan.png");
      document.images[3].style.display = "inline";
      ele.email.select();
      return false;
    }else{ //格式正确
      removeClass(ele.email,"borderRed");
      document.images[3].setAttribute("src","./img/gou.png");
      document.images[3].style.display = "inline";
      return true;
    }
  }

然后为各个输入框添加监听事件：

  var ele = { //存放各个input字段obj
      name: document.getElementById("name"),
      password: document.getElementById("password"),
      R_password: document.getElementById("R_password"),
      email: document.getElementById("email")
    };
    ele.name.onblur = function(){ //name失去焦点则检测
      checkName(ele.name.value);
    }
    ele.password.onblur = function(){ //password失去焦点则检测
      checkPassw(ele.password.value,ele.R_password.value);
    }
    ele.R_password.onblur = function(){ //R_password失去焦点则检测
      checkPassw(ele.password.value,ele.R_password.value);
    }
    ele.email.onblur = function(){ //email失去焦点则检测
      checkEmail(ele.email.value);
    }

最后就是点击提交注册时调用的check()函数了

function check(){  //表单提交则验证开始
    var ok = false;
    var nameOk = false;
    var emailOk = false;
    var passwOk = false;
    
    if(checkName(ele.name.value)){ nameOk = true; }  //验证name
    if(checkPassw(ele.password.value,ele.R_password.value)){ passwOk = true; } //验证password
    if(checkEmail(ele.email.value)){ emailOk = true; }  //验证email

    if(nameOk && passwOk && emailOk){ 
      alert("Tip: Register Success ..");  //注册成功
      //return true; 
    }
    return false;  //有误，注册失败
  }

完整代码：

  body{margin:0;padding: 0;}
  .login{position:relative;margin:100px auto;padding:50px 20px;width: 350px;height: 200px;border:1px solid #333;}
  .login legend{font-weight: bold;color: green;text-align: center;}
  .login label{display:inline-block;width:130px;text-align: right;}
  .btn{height: 30px;width:100px;padding: 5px;border:0;background-color: #00dddd;font-weight: bold;cursor: pointer;float: right;}
  input{height: 20px;width: 170px;}
  .borderRed{border: 2px solid red;}
  img{display: none;}



  
    
  
  

以上所述就是本文的全部内容了，希望能够对大家学习javascript表单验证有所帮助。