Biegral Blog

好用：

JS写上边

    <script type="text/javascript">
        function check(){
            var textF = document.getElementById("textfield");
            var cur = textF.value;
            var reg = /\.(?:csv|xls|xlsx)$/i; 

            var filename=cur;
            var index1=filename.lastIndexOf(".");
            //alert(index1);
            var index2=filename.length;
            //alert(index2);
            var postf=filename.substring(index1,index2);//后缀名
            alert(postf);

            if(reg.exec(postf)){
             alert(" 上传成功")
            }else{
             alert(" 上传失败")
         return false;
           }

          /*var textF = document.getElementById("textfield");
          var cur = textF.value;
          var reg = /(\.xls|\.xlsx|\.csv)/ig;
          if(reg.test(cur)){
           alert(" 上传成功")
          }
          else{
           alert(" 上传失败")
          return false;
          }*/
        }
    </script>
</head>

<form id="form1" method="post" action="/DealWithForm1/" onsubmit="return check()"> 
<table> 
<tr> 
<td>first_name:</td> 
<td><input name="firstname" type="text" id="firstname" /></td> 
<td><label id="firstnameLabel"></label></td> 
</tr> 
<tr> 
<td>last_name:</td> 
<td><input name="lastname" type="text" id="lastname" /></td> 
<td><label id="lastnameLabel"></label></td> 
</tr> 
</table> 
<hr width="40%" align="left" /> 
<button type="submit">提交</button> 
<button type="button" onclick="jump();">取消</button> 
</form> 

==============================

另一种，可以配合使用，点按钮或其它操作时改变action

 <input type="submit" value="确认" id="filters" />

 $("#filters").click(function () {
        //choose_checked();
        alert('here');
        if($("#choose22").attr("checked")=="checked"){
            alert('选择了');            
            $("#myform").submit();
        }else{
            alert('没选择');
            return false;

        }
    });

==============================

1、

<script type="text/javascript">
         function check(form) {

          if(form.userId.value=='') {
                alert("请输入用户帐号!");
                form.userId.focus();
                return false;
           }
       if(form.password.value==''){
                alert("请输入登录密码!");
                form.password.focus();
                return false;
         }
         return true;
         }
</script>  
 <form action="login.do?act=login" method="post">
用户帐号
  <input type=text name="userId" size="18" value="" >
<br>
 登录密码      
<input type="password" name="password" size="19" value=""/>      
 <input type=submit name="submit1" value="登陆" onclick="return check(this.form)">   
 </form>   
  

<script type="text/javascript">
         function check(form) {

          if(form.userId.value=='') {
                alert("请输入用户帐号!");
                form.userId.focus();
                return false;
           }
       if(form.password.value==''){
                alert("请输入登录密码!");
                form.password.focus();
                return false;
         }
         return true;
         }
</script>  
 <form action="login.do?act=login" method="post" onsubmit="return check(this)">
用户帐号
  <input type=text name="userId" size="18" value="" >
<br>
 登录密码      
<input type="password" name="password" size="19" value=""/>      
 <input type=submit name="submit1" value="登陆">   
 </form>  
 

<script type="text/javascript">
         function check(form) {

          if(form.userId.value=='') {
                alert("请输入用户帐号!");
                form.userId.focus();
                return false;
           }
       if(form.password.value==''){
                alert("请输入登录密码!");
                form.password.focus();
                return false;
         }

          document.myform.submit();
}
</script>  
 <form action="login.do?act=login" name="myform" method="post">
用户帐号
  <input type=text name="userId" size="18" value="" >
<br>
 登录密码      
<input type="password" name="password" size="19" value=""/>      
<input type=button name="submit1" value="登陆" onclick="check(this.form)">   
 </form>