高手:如何实现复选框与文本框的复合判断!(速结帖)
高手:我在实现ASP网页数据上传时,一文本框(price)与一复选框组合使用,当复选框没选中时,文本框必须输入内容,请问用JAVASCRIPT如何判断!请高手按我的程序思路解答,或详细解答,速结贴

...
<FORM   name= "userinfo "   id= "userinfo "   method= "post "   action= " "   onSubmit= "return   checkuserinfo(); ">  

...
<tr>
<td   width= "20% "   height= "30 "   valign= "middle "   align= "center "   class= "fon31 "> 产品价格: </td>
<td   width= "80% "   height= "22 "   valign= "middle "   align= "left "> <input   name= "price "   type= "text "   class= "regtext3 "   size= "40 "   maxlength= "20 "> <INPUT   name= "prd "   id= "prd "   type= "checkbox "   value= "0 "   class= "regtext2 "/> 面议 </td>
</tr>
...
</form>

<SCRIPT   LANGUAGE= "JavaScript ">
<!--
function   checkuserinfo()
...
if(document.userinfo.price.value== " ")&(document.userinfo.prd.checked==false)   {
      document.userinfo.price.focus();
              alert( "对不起，请填写产品生产厂家！ ");
      return   false;
          }  
...  
}
这样调试不正确,请高手指点!

------解决方案--------------------
<SCRIPT LANGUAGE= "JavaScript ">
<!--
function checkuserinfo()
...
if(document.userinfo.price.value== " ")&&(document.userinfo.prd.checked==false) {
document.userinfo.price.focus();
alert( "对不起，请填写产品生产厂家！ ");
return false;
}
...
}
------解决方案--------------------
<FORM name= "userinfo " id= "userinfo " method= "post " action= " " onSubmit= "return checkuserinfo

(); ">
<table>
<tr>
<td width= "20% " height= "30 " valign= "middle " align= "center " class= "fon31 "> 产品价格: </td>
<td width= "80% " height= "22 " valign= "middle " align= "left ">
<input name= "price " type= "text " class= "regtext3 " size= "40 " maxlength= "20 ">
<INPUT name= "prd " id= "prd " type= "checkbox " value= "0 " class= "regtext2 "/> 面议 </td>
</tr>
</table>
<INPUT type= "submit " value= "submit ">
</form>

<SCRIPT LANGUAGE= "JavaScript ">
function checkuserinfo()
{
if((document.userinfo.price.value== " ")&&(document.userinfo.prd.checked==true))
{
document.userinfo.price.focus();
alert( "对不起，请填写产品生产厂家！ ");
return false;
}
}
</SCRIPT>

复制回去另存为xx.htm,试试