为什么这个JavaScript循环检查复选框值不工作？

Question

JavaScript中的以下表单提交功能将获得第一个复选框值，但无法获取其他值。我已经测试了这种多种方式，并且在第二次获得复选框的“.checked”值时似乎总是有问题。

的Javascript：

function checkForm() 
{ 
    numrows = document.theform.numrows.value; 
    if(numrows == -1) 
    { 
    alert("You do not have any transactions setup yet"); 
    return false; 
    } 

    emailcheckcount = 0; 
    for(i=0; i<=numrows; i++) 
    { 
     var recid = document.forms["theform"]["recid"+i].value; 
     var checkbox = document.getElementById(recid+"_to"+i); 

     if (checkbox.checked) 
     { 
     emailcheckcount++; 

     } 
    } 

    if(emailcheckcount == 0) { 
    alert("Please Select At Least One Email for Alerts"); 
    return false; 
    } 

    document.theform.submit(); 
} 

HTML/ASP：

<% 
    numrows = -1 
    strSQL = "select recid, customer, documenttpid, tolist, cclist, bcclist, receivedvia, addmailout, emailsubject from MailOut where customer like '%"&cname&"%' and (receivedvia = 'email' or addmailout = 'email') and emailsubject <> 'ignore' order by customer, documenttpid;" 
    Set rs = objConnection2.Execute(strSQL, ,adCmdText) 
    if not (rs.eof and rs.bof) Then 

     arr = rs.getrows() 
     numrows = ubound(arr,2) 
     for i=0 to numrows 
     dim tolist 
     dim cclist 

     recid = arr(0,i) 
     customer = arr(1,i) 
     documenttpid = arr(2,i) 
     if not IsNull(arr(3,i)) Then 
      tolist = split(arr(3,i),"|") 
     else 
      tolist = null 
     end if 


     if not IsNull(arr(4,i)) and Len(arr(4,i)) > 0 Then 
      cclist = split(arr(4,i),"|") 
     else 
      cclist = null 
     end if 

     bcclist = arr(5,i) 
     receivedvia = arr(6,i) 
     addmailout = arr(7,i) 
     emailsubject = arr(8,i) 


    %> 
    <tr> 
    <!-- 
    <td valign='top' style="border-bottom:1px solid black;">&nbsp;<%=customer%></td> 
    <td valign='top' style="border-bottom:1px solid black;">&nbsp;<%=receivedvia%></td> 
    --> 
    <td valign='top' style="border-bottom:1px solid black;">&nbsp;<%=documenttpid%></td> 
    <td valign='top' style="border-bottom:1px solid black;"> 
    <input type="hidden" name="recid<%=i%>" value="<%=recid%>">&nbsp;<%=emailsubject%></td> 
    <td valign='top' style="border-bottom:1px solid black;"> 
    <% 
    emailnum = 0 
    if not isNULL(tolist) then 
     for each email in tolist 
      if not(isNULL(email) or trim(email)="") Then 
    %> 
     <input type='checkbox' id='<%=recid%>_to<%=emailnum%>' name='<%=recid%>_to<%=emailnum%>'>&nbsp;<%=email%> /<%=recid%>_to<%=emailnum%> 
     <input type='hidden' name='<%=recid%>_to<%=emailnum%>email' value='<%=email%>'><BR> 
    <% 
      end if 

      emailnum = emailnum + 1 
     next 
    end if 
    %> 
    <input type='hidden' name='numtoemails<%=i%>' value='<%=emailnum%>'> 

    <BR>Add Email:<input type='text' name='addtoemail<%=i%>'></td> 
    <td valign='top' style="border-bottom:1px solid black;"> 
    <% 
    ccnum = 0 
    if(not isNULL(cclist))then 
     for each email in cclist 
      if trim(email) <> "") = 0 Then 
    %> 
     <input type='checkbox' name='<%=recid%>_cc<%=ccnum%>'>&nbsp;<%=email%> 
     <input type='hidden' name='<%=recid%>_cc<%=ccnum%>email' value='<%=email%>'><BR> 
    <% 
      end if 

      ccnum = ccnum + 1 
     next 
    end if 
    %> 
    <input type='hidden' name='numccemails<%=i%>' value='<%=ccnum%>'> 

    <BR>Add Email:<input type='text' name='addccemail<%=i%>'></td> 
    </tr> 
    <% 
     next 
    end if 
    %> 

    <input type="hidden" name="numrows" value="<%=numrows%>"> 

    <tr><td align="Right" colspan="4"><input type="button" value="Submit" style="width:70px;" class="btn-primary" onclick="checkForm();"></td></tr> 

Answer 1

emailnum从0开始在每个你有一个新的recid时间

emailnum = 0 
... 
     <input type='checkbox' id='<%=recid%>_to<%=emailnum%>' name='<%=recid%>_to<%=emailnum%>'>&nbsp;<%=email%> /<%=recid%>_to<%=emailnum%> 

然而，你的javascript c ode只是增加后缀我

var checkbox = document.getElementById(recid+"_to"+i); 

检查生成的HTML，看看它是否符合你的Javascript假设。