JavaScript チュートリアルの登録ページのフォームの検証-jsチュートリアル-php.cn

以下のエディターは、JavaScript を使用して登録ページのフォーム検証を完了する例を示します。編集者はこれがとても良いと思ったので、参考として共有します。エディターをフォローして一緒に見てみましょう

1. ステップ分析

最初のステップ: イベント (onsubmit) を決定し、それに関数をバインドします

2 番目のステップ: この関数を作成します (ユーザーを取得)データを入力(データを取得する際、指定された場所にIDを定義する必要があります>)

ステップ 3: ユーザーが入力したデータを判断する

ステップ 4: データが正当であるかどうかを判断する(フォームを送信する)

ステップ 5 : データが不正です (エラーメッセージが表示され、フォームの送信が許可されません)

質問: フォームの送信を制御するにはどうすればよいですか?

onsubmitイベントについて: 通常フォーム送信に使用されるため、関数定義時に戻り値を与える必要があります。

onsubmit = return checkForm()

2. 登録ページのフォーム検証を完了します

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title>注册页面</title>
  <script>
   function checkForm(){
    //alert("aa");
    
    /**校验用户名*/
    //1.获取用户输入的数据
    var uValue=document.getElementById("user").value;
    //alert(uValue);
    if(uValue==""){
     //2.给出错误提示信息
     alert("用户名不能为空");
     return false;
    }
    
    /**校验密码*/
    var pValue=document.getElementById("password").value;
    if(pValue==""){     //注意空的表示方法
     alert("密码不能为空");
     return false;
    }
     
    /** 校验确认密码*/
    var rpValue=document.getElementById("repassword").value;
    if(rpValue!=pValue){
     alert("两次密码输入不一致！");
     return false;
    }
    
    /**校验邮箱*/
    var eValue=document.getElementById("email").value;
    if(！/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/.test(eValue)){
     alert("邮箱格式不正确！");
    }
   }
  </script>
 </head>
 <body>
  <table border="1px" align="center" width="1300px" cellpadding="0px" cellspacing="0px">
   
   <!--1.logo部分-->
   <tr>
    <td>
     <!--嵌套一个一行三列的表格-->
     <table border="1px" width="100%">
      <tr height="50px">
       <td width="33.3%">
        <img src="../img/logo2.png" height="47px" />
       </td>
       <td width="33.3%">
        <img src="../img/header.png" height="47px"/>
       </td>
       <td width="33.3%">
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a>
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >注册</a>
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >购物车</a>
       </td>
      </tr>
     </table>
    </td>
   </tr>
   
   <!--2.导航栏部分-->
   <tr height="50px" >
    <td bgcolor="black">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font size="3" color="white">首页</font></a>           
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">手机数码</font></a>        
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">电脑办公</font></a>       
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">鞋靴箱包</font></a>       
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">家用电器</font></a>
    </td>
   </tr>
   
   <!--3.注册表单-->
   <tr>
    <td height="600px" background="../img/regist_bg.jpg">
     <!--嵌套一个十行二列的表格-->
     <form action="#" method="get" name="regForm" onsubmit="return checkForm()">
     <table border="1px" width="750px" height="400px" align="center" cellpadding="0px" cellspacing="0px" bgcolor="white">
      <tr height="40px">
       <td colspan="2">
        <font size="4">会员注册</font>   USER REGISTER
       </td>
      </tr>
      <tr>
       <td>用户名</td>
       <td>
        <input type="text" name="user" size="35px" id="user"/>
       </td>
      </tr>
      <tr>
       <td>密码</td>
       <td>
        <input type="password" name="password" size="35px" id="password"/>
       </td>
      </tr>
      <tr>
       <td>确认密码</td>
       <td>
        <input type="password" name="repassword" size="35px" id="repassword"/>
       </td>
      </tr>
      <tr>
       <td>E-mail</td>
       <td>
        <input type="text" name="e-mail" size="35px" id="email"/>
       </td>
      </tr>
      <tr>
       <td>姓名</td>
       <td>
        <input type="text" name="username" size="35px"/>
       </td>
      </tr>
      <tr>
       <td>性别</td>
       <td>
        <input type="radio" name="sex" value="男"/>男
        <input type="radio" name="sex" value="女"/>女
       </td>
      </tr>
      <tr>
       <td>出生日期</td>
       <td>
        <input type="text" name="birthday" size="35px"/>
       </td>
      </tr>
      <tr>
       <td>验证码</td>
       <td>
        <input type="text" name="yzm" />
        <img src="../img/yanzhengma.png" />
       </td>
      </tr>
      <tr align="center">
       <td colspan="2">
        <input type="submit" value="注册" />
       </td>
      </tr>
     </table>
     </form>
    </td>
   </tr>
   
   <!--4.广告图片-->
   <tr>
    <td>
     <img src="../img/footer.jpg" width="100%"/>
    </td>
   </tr>
   
   <!--5.友情链接和版权信息-->
   <tr>
    <td align="center">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>关于我们</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>联系我们</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>招贤纳士</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>法律声明</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>友情链接</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>支付方式</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>配送方式</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>服务声明</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>广告声明</font></a>
     <p>
      Copyright © 2005-2016 hh商城 版权所有 
     </p>
    </td>
   </tr>
  </table>
 </body>
</html>

ログイン後にコピー

検証と確認のパスワード部分に正規表現を使用します（覚えておく必要はありません、必要に応じて文書を参照してください） )

正規表現.test(検証対象)は、条件を満たしていればtrue、falseの場合は満たしていません。

以上がJavaScript チュートリアルの登録ページのフォームの検証の詳細内容です。詳細については、PHP 中国語 Web サイトの他の関連記事を参照してください。