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js中判断用户输入的值是否为空的简单实例

  • 时间:2020-11-27 15:15 编辑: 来源: 阅读:
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摘要:js中判断用户输入的值是否为空的简单实例
在js中判断用户输入的值是否为空,这是大家用得非常多的. 这没有什么好写的. 而我却写了. 原因只是自以为是的认为我的这些代码写得不错, 供大家参考一下. 这是摘自的我一个项目的中的用户注册页面.对于大多数人来说,这都几乎是100%经历过的. 贴代码吧,这些代码都是用js写的. 不难,很容易看懂. 看的时候,只要区别两个js类就行了. [b]前台页面代码:reguser.aspx [/b]
[url=/CSS/EnterpriseWebSite.css]        <script src="/js/CommonFunction.js" ></script>         <script>             var reg    = {};             reg.userName    = '';             reg.password    = '';             reg.confirmPassword    = '';             reg.question    = '';             reg.answer    = '';             reg.url    = '';             reg.sex    = 1;             reg.email    = '';             reg.tel    = '';             reg.mobile    = '';             reg.qq    = '';             reg.address    = '';             reg.postalcode    = '';             reg.form    = null;             function btnSubmit_onclick()             {                 reg.form    = document.forms[0];                 var comFun    = new commonFunction();                 if(!comFun.checkIsEmpty(reg.form))                 {                     return false;                 }                 if(comFun.$getElementById('txtPassword').value!=comFun.$getElementById('txtConfirmPassword').value)                 {                     alert('两次密码输入不一致');                     comFun.$getElementById('txtConfirmPassword').select();                     return false;                 }                 reg.userName    = comFun.$getElementById('txtUserName');                 reg.password    = comFun.$getElementById('txtPassword');                 reg.question    = comFun.$getElementById('txtQuestion');                 reg.answer        = comFun.$getElementById('txtAnswer');                 reg.url            = comFun.$getElementById('txtUrl');                 reg.email        = comFun.$getElementById('txtEmail');                 reg.tel            = comFun.$getElementById('txtTel');                 reg.mobile        = comFun.$getElementById('txtMobile');                 reg.qq            = comFun.$getElementById('txtQQ');                 reg.address        = comFun.$getElementById('txtAddress');                 reg.postalcode    = comFun.$getElementById('txtPostalcode');                 var es    = comFun.$getElementsByName('sex');                 var eL    = es.length;                 for(var i=0; i<eL; i++)                 {                     var    e    = es[i];                     if(e.checked)                     {                         reg.sex    = e.value;                         break;                     }                 }                 RegUser.Reg(reg.userName.value, reg.password.value, reg.question.value, reg.answer.value, reg.url.value, reg.sex.value, reg.email.value, reg.tel.value, reg.mobile.value, reg.qq.value, reg.address.value, reg.postalcode.value, callback_Reg);             }             function callback_Reg(res)             {                 var rv    = res.value;                 if(rv)                 {                     alert('注册成功!');                     window.location.href='/Default.aspx';                 }                 else                 {                     alert('有错误发生,注册失败!有可能是用户名或者域名被别人注册过了!');                 }             }             // 检测用户名的域名是否被其它用户注册过了             function checkIsRegistered(obj, errorS, t)             {                 var v    = obj.value;                 var rv    = RegUser.CheckIsRegistered(v, t).value;                 if(rv)                 {                     alert(errorS);                     obj.select();                     return false;                 }             }         </script>     </head>     <body MS_POSITIONING="GridLayout">         <form id="Form1" method="post" runat="server">             <table width="98%" border="0" align="center" cellpadding="3" cellspacing="0">                 <tr>                     <td width="16%"><div align="right">用户名:</div>                     </td>                     <td width="84%"><input type="text" id="txtUserName" onblur="checkIsRegistered(this, '该用户名已经被注册,请使用其它的!', 1)" maxlength="15" isRequired="true" isValidate="true" errorSForEmpty="用户名不能为空!" errorSForValidate="匹配出错!以字母开头,允许3-16字节,允许字母数字下划线以及许可的安全符号!" validatePattern="/^[a-zA-Z][a-zA-Z0-9_$%]{2,15}$/" title="用户名必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">密码:</div>                     </td>                     <td><input type="password" id="txtPassword" maxlength="15" isRequired="true" isValidate="true" errorSForEmpty="密码不能为空!" errorSForValidate="匹配出错!要求3-16字节,允许字母数字下划线以及许可的安全符号!!" validatePattern="/^[a-zA-Z0-9_$%]{2,15}$/" title="密码必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">确认密码:</div>                     </td>                     <td><input type="password" id="txtConfirmPassword" isRequired="true" errorSForEmpty="确认密码不能为空!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">密码提示问题:</div>                     </td>                     <td><input type="text" id="txtQuestion" maxlength="50" isRequired="true" isValidate="true" errorSForEmpty="密码提示问题没有填写!" errorSForValidate="长度必须在8-50个字之间且不得有空格!" validatePattern="/\S{8,50}/" title="密码提示问题必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">密码问题答案:</div>                     </td>                     <td><input type="text" id="txtAnswer" maxlength="50" isRequired="true" isValidate="true" errorSForEmpty="密码问题答案没有填写!" errorSForValidate="长度必须在8-50个字之间且不得有空格!" validatePattern="/\S{8,50}/" title="密码问题答案必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">站点Url:</div>                     </td>                     <td><input type="text" id="txtUrl" onblur="checkIsRegistered(this, '该Url已经被注册,请使用其它的!', 2)" maxlength="20" isRequired="true" isValidate="true" errorSForEmpty="站点Url不能为空!" errorSForValidate="站点Url格式不对!" validatePattern="/^[a-zA-Z0-9]{1,20}$/" title="站点Url必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">性别:</div>                     </td>                     <td><input type="radio" id="boy" name="sex" value="1" checked>男  <input type="radio" id="girl" name="sex" value="0">女</td>                 </tr>                 <tr>                     <td><div align="right">Email:</div>                     </td>                     <td><input type="text" id="txtEmail" isValidate="true" errorSForValidate="Email格式不正确!" validatePattern="/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/"></td>                 </tr>                 <tr>                     <td><div align="right">固定电话:</div>                     </td>                     <td><input type="text" id="txtTel" isRequired="true" isValidate="true" errorSForEmpty="固定电话不能为空!" errorSForValidate="固定电话格式不对!请使用0592-5555555的格式!" validatePattern="/^(\d{3}-|\d{4}-)?(\d{8}|\d{7})$/" title="固定电话必须填写!"><font color="#ff0000">*</font></td>                 </tr>                 <tr>                     <td><div align="right">移动电话:</div>                     </td>                     <td><input type="text" id="txtMobile" isValidate="true" errorSForValidate="移动电话格式不正确!" validatePattern="/^1\d{10}$/"></td>                 </tr>                 <tr>                     <td><div align="right">QQ:</div>                     </td>                     <td><input type="text" id="txtQQ" isValidate="true" errorSForValidate="QQ格式不正确!" validatePattern="/^[1-9]*[1-9][0-9]*$/"></td>                 </tr>                 <tr>                     <td><div align="right">住址:</div>                     </td>                     <td><input type="text" id="txtAddress"></td>                 </tr>                 <tr>                     <td><div align="right">邮编:</div>                     </td>                     <td><input type="text" id="txtPostalcode" maxlength="6" isValidate="true" errorSForValidate="邮编不正确!" validatePattern="/^\d{6}/"></td>                 </tr>                 <tr>                     <td><div align="right">操作:</div>                     </td>                     <td><input type="button" value="注册" id="btnSubmit" onclick="btnSubmit_onclick()">  <input type="reset" value="重置"></td>                 </tr>             </table>         </form>     </body> </html>
在上面的代码中,有包含了一个CommonFunction.js文件,下面这是他的内容:
/*********************************************************** * *    公共js函数 * ***********************************************************/ function commonFunction() {     // check value is null or empty     this.checkIsEmpty    = function(obj)     {         var flag    = true;         for(var i=0; i<obj.length; i++)         {             var e    = obj.item(i);             if(e.isRequired)             {                    if(e.value=='')                 {                     alert(e.errorSForEmpty);                     e.focus();                     flag    = false;                     break;                 }             }             if(e.isValidate)             {                 if(this.checkValidate(e)==false)                 {                     alert(e.errorSForValidate);                     e.select();                     e.focus();                     flag    = false;                     break;                 }             }         }         return flag;     }     // check value is validate     this.checkValidate    = function(e)     {         var v    = e.value;         if(v!='')         {             return this.checkReg(e.validatePattern, v);         }     }     // regexp validate     this.checkReg    = function(pattern, value)     {         pattern    = pattern.substring(1, pattern.length-1);         var reg    = new RegExp(pattern);         if(!reg.test(value))         {             return false;         }     }     // return an Element By id object for what id.     this.$getElementById    = function(id)     {         var e    = document.getElementById(id);         if(e!='undefined')         {             return e;         }         return;     }     // return an Element By name object for what id.     this.$getElementsByName    = function(id)     {         var e    = document.getElementsByName(id);         if(e!='undefined')         {             return e;         }         return;     } }
贴一张效果图片: [img]http://files.jb51.net/file_images/article/201312/20131223093321.png[/img]
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