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JavaWeb form operation application

零下一度Original: 2017-06-17 17:18:021263browse

Recently when I was working on a project, I came across a form that needed to be verified immediately after input, instead of verification after submission. I looked for information on the Internet, but there was no suitable one, so I wrote one myself and shared it on the Script House platform for everyone. Reference

Question:How to verify the form immediately after input, instead of the inconvenience of verifying again after submission (the ones found on the Internet are either ambiguous or incomplete...)

Method: In view of this, add my personal understanding (notes) above.

Screenshot:

JavaWeb form operation application

Code:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户注册</title>
<!-- 此处引用外部css样式 -->
<link rel="stylesheet" href="css/style.css" rel="external nofollow" />
  <script type="text/javascript">
  //及时验证用户名
  function checkuse(){
     //在每个函数中定义check变量是为了在表单提交后，能够逐个验证每个函数是否通过，很好很好。（以下同理）
     var check; 
     var username = document.getElementById("username").value; 
     if (username.length > 18 || username.length < 6) { 
       alert("用户名输入不合法，请重新输入！");
       //此处甚妙，既然你在此处输入错误，那么按理说当然要在此处继续输入了。（在此处继续获取焦点！）
       document.getElementById("username").focus();
       check = false; 
      } else { 
       document.getElementById("checktext1").innerHTML = "* 用户名由6-18位字符组成 √"; 
       check = true; 
      } 
      return check; 
    } 
  //利用正则表达式判断密码符合否
  function checkpwd() { 
    var check; 
    var reg = /[^A-Za-z0-9_]+/;
    var regs = /^[a-zA-Z0-9_\u4e00-\u9fa5] + $ /;
    var password = document.getElementById("password").value; 
    if (password.length < 6 || password.length > 18 || regs.test(password)) { 
      alert("密码输入不合法，请重新输入！");
      document.getElementById("password").focus();
      check = false; 
    } else { 
      document.getElementById("checktext2").innerHTML = "* 密码由6-18位字符组成，且必须包含字母、数字和标点符号 √"; 
      check = true; 
    } 
    return check; 
  } 
  //验证密码是否不一致！
  function checkpwdc() { 
    var check; 
    var password = document.getElementById("password").value; 
    var pwdc = document.getElementById("pwdc").value; 
    if (password != pwdc) { 
      alert("两次输入密码不一致，请重新输入！");
      document.getElementById("pwdc").focus();
      check = false; 
    } else { 
      document.getElementById("checktext3").innerHTML = "* 请再次输入你的密码 √"; 
      check = true; 
    } 
    return check; 
  }
  //提交时验证用户类别
  function checkut(){
    var check; 
    if(document.getElementById("selUser").selectedIndex == 0)
      {
        alert("请选择用户类型！");
        document.getElementById("selUser").focus();
        check = false; 
      }else{
        document.getElementById("checktext4").innerHTML = "* 请选择用户类型 √"; 
        check = true; 
      }
    return check;  
  }
  //提交时验证用户性别
  function checkGender(){
    var check; 
    var gender = "";
    //获取所有名称为sex的标签
    var sex = document.getElementsByName("sex");
    //遍历这些名称为sex的标签
    for(var i=0;i<sex.length;++i){
      //如果某个sex被选中，则记录
      if(sex[i].checked)
        gender = sex[i].value;   
    }
    if(gender == "")
      {
        alert("请选择性别！");
        check = false;
      }else{
        document.getElementById("checktext5").innerHTML = "* 请选择你的性别 √"; 
        check = true; 
      }  
    return check;
  }
  //及时验证出生日期
  function checkDate(){
    var check; 
    if(document.getElementById("txtDate").value ==""){
       alert("请填写出生日期！");
       document.getElementById("txtDate").focus();
       check = false;
      }else{
        document.getElementById("checktext6").innerHTML = "* 请选择你的出生日期 √"; 
        check = true;
      }
    return check;
  }
  //及时验证兴趣爱好
  function checkHobby(){
    var check; 
    var hobby = 0;
    //objNum为所有名称为hobby的input标签
    var objNum = document.getElementsByName("hobby");
    //遍历所有hobby标签
    for(var i=0;i<objNum.length;++i){
      //判断某个hobby标签是否被选中
      if(objNum[i].checked==true)
        hobby++;
    }  
    //如果有选中的hobby标签
    if(hobby >=1){
      document.getElementById("checktext7").innerHTML = "* 请选择你的兴趣爱好 √";     
      check = true;
    }else{
      alert("请填写爱好！");
      check = false;
    }
    return check;  
  }
  //正则表达式验证电子邮件（及时）
  function checkemail(){
    var check; 
    //电子邮件的正则表达式
    var e1 = document.getElementById("email").value.indexOf("@",0);
    var e2 = document.getElementById("email").value.indexOf(".",0);
    if(email == "" || (e1==-1 || e2==-1) || e2<e1 )
    {
      alert("E_mail输入错误!");
      document.getElementById("email").focus();
      check = false;
    } else { 
      document.getElementById("checktext8").innerHTML = "* 请填写常用的EMAIL，将用于密码找回 √"; 
      check = true; 
    } 
    return check; 
  } 
  //及时验证自我介绍
  function checkintro(){
    var check;  
    var intro = document.getElementById("introduction").value; 
    if (intro.length > 100) { 
     alert("字数超限！"); 
     check = false; 
    } else { 
     document.getElementById("checktext9").innerHTML = "* 限100字内 √";
     document.getElementById("checktext9").focus();
     check = true; 
    } 
    return check; 
  } 
  //提交表单时所有都验证一遍(若任何一个验证不通过，则返回为false，阻止表单提交)
  function check() { 
    var check = checkuse() && checkpwd() && checkpwdc() && checkut() && checkGender() && checkDate() && checkHobby()
     && checkemail() &&checkintro(); 
    return check;  
  } 
  </script>
</head>
<body >
<!-- <form action ="跳转页面" method ="get"|"post" name ="表单名称" target ="打开方式" enctype="multipart/form-data" > -->
<!-- onsubmit()函数在返回值为true时提交表单。 -->
<form action="#" method="get" onsubmit="return check()" >
<fieldset>
<legend>
 表单及时验证小例子
</legend>
<table align="left" style="background-image: url(&#39;img/4.jpg&#39;);" >
  <tr>
   <td>用户名:</td>
   <td><input type="text" name="username" id="username" onchange=" checkuse()" /></td>
   <td id="checktext1">* 用户名由6-18位字符组成</td>
  </tr>
  <!-- onblur 事件处理程序:当元素或窗口失去焦点时触发该事件 -->
  <!-- onchange事件处理程序:当表单元素获取焦点，并且内容发生改变时，触发该事件 -->
  <!-- 以下同理 -->
  <tr>
   <td>密码:</td>
   <td><input type="password" name="password" id="password" onchange="checkpwd()" /></td>
   <td id="checktext2">* 密码由6-18位字符组成，且必须包含字母、数字和标点符号</td>
  </tr>
  <tr>
   <td>确认密码：</td>
   <td><input type="password" name="pwdc" id="pwdc" onchange="checkpwdc()" /></td>
   <td id="checktext3">* 请再次输入你的密码</td>
  </tr>
  <tr>
   <td>用户类型：</td>
   <td>
     <select id="selUser" onblur="checkut()">
       <option name="selUser" value="0">请选择</option>
       <option name="selUser" value="1">管理员</option>
       <option name="selUser" value="2">普通用户</option>   
     </select>
   </td>
   <td id="checktext4">* 请选择用户类型</td>
  </tr>
  <tr>
   <td>性别：</td>
   <td>
     <input type="radio" value="1" name="sex" onchange="checkGender()"/>男
     <input type="radio" value="2" name="sex" onchange="checkGender()"/>女
   </td>
   <td id="checktext5">* 请选择你的性别</td>
  </tr>
  <tr>
   <td>出生日期：</td>
   <td><input type="date" name="date" id="txtDate" onblur="checkDate()"/></td>
   <td id="checktext6">* 请选择你的出生日期</td>
  </tr>
  <tr>
   <td>兴趣爱好：</td>
   <td>
     <input type="checkbox" name="hobby" value="reading" onchange="checkHobby()">阅读
     <input type="checkbox" name="hobby" value="music" onchange="checkHobby()">音乐
     <input type="checkbox" name="hobby" value="sports" onchange="checkHobby()">运动
   </td>
   <td id="checktext7">* 请选择你的兴趣爱好</td>
  </tr>
  <tr>
   <td>电子邮件：</td>
   <td><input type="text" name="email" id="email" onchange="checkemail()"/></td>
   <td id="checktext8">* 请填写常用的EMAIL，将用于密码找回</td>
  </tr>
  <tr>
   <td>自我介绍：</td>
   <td><textarea cols="30" rows="3" name="introduction" id="introduction" onchange="checkintro()">这是自我介绍...</textarea></td>
   <td id="checktext9">* 限100字内</td>
  </tr>
  <tr>
   <td colspan="2" align="center">
     <input type="submit" name="submit" value="提交" />
     <input type="reset" name="reset" value="重置" />
   </td>
  </tr>
</table>
</fieldset>
</form>
</body>
</html>

CSS style:

 input:focus,textarea:focus{
    border:1px solid #f00;
    background:#fcc;
  }
  textarea{
    width:230px;
    height:50px;
  }
  body
  {
    font-size:15px;
    /* 字体的样式 */
    font-family:Microsoft YaHei;  
  }
  select option{
    font-size:10px;
    font-family:Microsoft YaHei;
  }

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