想在前台判断字段是否为空?不提示错误? - 编程论坛

#2

gupiao1752010-05-19 17:02

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript" type="text/javascript" src="../js/function.js"></script>
<script  language="javascript">
function check()
{
            if  (document.myform.student_name.value == "")
                  {window.alert('请输入姓名!!');
                  document.myform.student_name.focus();
                   return  false;}
            else if (document.myform.sex.value == "")
                  {window.alert('请输入性别!!');
                  document.myform.sex.focus();
                   return  false;}
            else if (document.myform.age.value == "")
                 { window.alert('请输入年龄!!');
                  document.myform.age.focus();
                   return  false;}
                 return true
       }
</script>
</head>

<body>
<table width="45%" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td height="30" colspan="2"><div align="center"><strong>添加学生信息</strong></div></td>
  </tr>
<form action="" method="post" name="myform" onsubmit="return check()" >
  <tr>
    <td width="16%" height="30"><div align="center">姓名:</div></td>
    <td width="84%" height="30"><input name="student_name" type="text" ></td>
  </tr>
  <tr>
    <td height="30"><div align="center" >性别:</div></td>
    <td height="30"><input name="sex" type="text" ></td>
  </tr>
  <tr>
    <td height="30"><div align="center" >年龄:</div></td>
    <td height="30"><input name="age" type="text" v></td>
  </tr>
  <tr>
    <td height="30"><div align="center">入校时间:</div></td>
    <td height="30"><input name="in_time" type="text" ></td>
  </tr>
  <tr>
    <td height="30"><div align="center">专业:</div></td>
    <td height="30"><input name="major" type="text" ></td>
  </tr>
  <tr>
    <td height="30"><div align="center">籍贯:</div></td>
    <td height="30"><input name="homeplace" type="text" ></td>
  </tr>
  <tr>
    <td height="30" colspan="2"><div align="center">
      <input type="submit" name="Submit" value="提交" >
      <input type="reset" name="Submit2" value="重置">
    </div>
    </td>
  </tr>
  </form>
</table>
</body>
</html>
这样试试！

#3

astaward2010-05-19 17:36

<form action="save.asp" method="post" name="" >这里name应该是myform，不然document.myform.student_id.value找不到相应项

#4

fengmnll2010-05-19 19:48

回复 2楼 gupiao175

你好,谢谢.不知道能不能帮我在看这个文件

<%
      dim  sql,student_id,student_name,sex,in_time,homeplace,major
      student_id=Trim(Request.Form("student_id"))
      student_name=Trim(Request.Form("student_name"))
      sex=Trim(Request.Form("sex"))
      age=Trim(Request.Form("age"))
      in_time=Trim(Request.Form("in_time"))
      homeplace=Trim(Request.Form("homeplace"))
      major=Trim(Request.Form("major"))
      set rs=Server.CreateObject("ADODB.Recordset")
      sql="select * from student where student_name='"&student_name&"'"
      rs.open sql,conn,1,3
      if not rs.eof  then
             response.Write"<script> alert('此学生已存在.');history.back(-1);</script>"
                          response.End
     else
            'set rs=nothing
            rs.addnew
            rs("student_name")=student_name
            rs("sex")=sex
            rs("in_time")=in_time
            rs("homeplace")=homeplace
            rs("major")=major
            rs.update
            rs.close
            set rs=nothing

  end if

  'response.Write"<script language=javascript>{window.alert('记录添加成功!');window.location.href=student.asp';}
    response.write "<script language=jscript>alert(记录添加成功!');history.back(-1)</script>"
     response.Redirect("add_student.asp")
     response.End()
%>
整个页面没有跳转?不知道是怎么回事呢?