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最近我发布了一个关于为什么我的 javascript 表单不起作用的问题。三个问题之一是 - 复选框和数量

我需要使用我的 chkquantity 正则表达式测试每个输入值，并确保订购的数量超过零，因为目前我的代码仅检查已选中复选框但未提供数量或提供数量但未选中复选框的情况和因此，这些测试不排除未选中复选框且所有数量设置为零的提交。

然后我需要为 totqty 小于或等于零生成进一步的测试

正则表达式 - var chkquantity = ^([1-9]?\d|[1-4]\d{2}|500)$/

测试

if (((document.form1.summer.checked) && (summer2012 <=0)) 
|| ((document.form1.autumn.checked) && (autumn2012 <=0)) 
|| ((document.form1.winter.checked) && (winter2012 <=0)))
{ 
alertmsg = alertmsg + "Please enter Quantity" +"\n"; 
}
else if (((!document.form1.summer.checked) && (summer2012 >0)) 
|| ((!document.form1.autumn.checked) && (autumn2012 >0)) 
|| ((!document.form1.winter.checked) && (winter2012 >0))) { 
alertmsg = alertmsg + "Please choose Product" +"\n";
}

if (alertmsg != "")
{
alertmsg = "Please enter the following values \n" + alertmsg;
alert(alertmsg);
} 

var f = document.form1;
if (!f.summer.checked && !f.autumn.checked && !f.winter.checked) {
alertmsg = alertmsg + "Please choose at least one edition of the magazine" +"\n";

}

if ((chkquantity.test(quantity) <= 500) {
alertmsg = alertmsg + "Please limit each magazine to 500 copies or less:" + "\n";
}

html -

 <form name="form1" method="post">
    <fieldset id="fieldset">
       <legend id="legend">Order the latest Saraysounds Magazine</legend>
 <table width="500" border=0 align="left" cellpadding="4" cellspacing="4">
           <tr>
          <td colspan="2"><div align="left">First Name</div></td>
          <td colspan="2"><input type="text" name="fname"/>
          </td>
        </tr>
        <tr>
          <td colspan="2"><div align="left">Second Name</div></td>
          <td colspan="2">
            <input type="text" name="lname"/>
          </td>
        </tr>
         <tr>
          <td colspan="2"><div align="left">Address</div></td>
          <td colspan="2"><textarea name="address" cols="30" rows=5 col=40 wrap=soft>    </textarea>
          </td>
          </tr>
          <tr>
           <td colspan="2"><div align="left">Postcode</div></td>
          <td colspan="2">  <input type="text" name="postcode"/>
          </td>
        </tr>
           <tr>
          <td colspan="2"><div align="left">Email</div></td>
          <td colspan="2">
            <input type="text" name="email"/>
          </td>
        </tr>
         <tr>
          <td colspan="2"><div align="left">Telephone</div></td>
          <td colspan="2">
            <input type="text" name="telephone"/>
          </td>
              </tr>
                  <tr>
                 <td colspan="4"><center>
                   <strong>Select Magazine</strong></center></td>
                 </tr>
                     <tr>
                 <td width="123"><center>
                 <strong>Product Name</strong></center></td>
                 <td width="30" ><center>
                   <strong></strong>
                 </center></td>
                   <td ><center>
                   <strong>Price</strong>
                 </center></td>
                   <td>
                  <strong>Quantity</strong>
                 </td>
             </tr>
           <tr>
             <td  align="right">Summer 2012
               </td>
             <td>
               <input type="checkbox" name="summer" value="Summer 2012"/>
           </td>
             <td align="center" width="69"><div align="right">20.00 </div></td>
             <td width="216"><input name="summer2012" type="text" size="5"   value="0"/></td>
               </tr>
         <tr>
             <td align="right">Autumn 2012
             </td>
             <td>
               <input type="checkbox" name="autumn" value="Autumn 2012"/>
           </td>
             <td align="center" width="69"><div align="right">20.00 </div></td>
             <td><input name="autumn2012" type="text" size="5" value="0"/></td>
         </tr>
         <tr>
             <td align="right">Winter 2012
           </td>
             <td>
               <input type="checkbox" name="winter" value="Winter 2012"/>
          </td>
             <td align="center"  width="69"><div align="right">20.00</div></td>
             <td><input name="winter2012" type="text" size="5" value="0"/></td>
          </tr>
               <tr>
             <td align="center" colspan="4"><input name="button" type="button"   onClick="javascript:display()" value="Submit"/>
              <input type="reset" value="Clear Form"/>
             </td>
           </tr>
  </table>
   </fieldset>
 </form>
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