为什么我的JavaScript代码没有使用onChange方法更改值？

我的代码如下。出于某种原因，当类别和广告大小与预期一致时，代码不会更改字段。它们是类别的对应数字，如大小等。有没有办法解释为什么这不起作用

<cfparam name="product_category" default="1">

<cfquery name="getFlyerInfo" datasource="mydatasource">
      select * from flyer_cost where fcid = #product_category#
</cfquery>

<cfquery name="getFlyerCat" datasource="mydatasource">
      select * from flyer_category
</cfquery>

<cfquery name="getFlyerSize" datasource="mydatasource">
      select * from flyer_size
</cfquery>

<cfoutput>
<script language="JavaScript">
function PopulateMe()
{

document.flyer.product_category.value = GetElementByID('#getFlyerInfo.fcid#');
document.flyer.page_size.value = GetElementByID('#getFlyerInfo.fsid#');
document.flyer.max_products.value = GetElementByID('#getFlyerInfo.max_products#');
document.flyer.max_images.value = GetElementByID('#getFlyerInfo.max_images#');
document.flyer.price.value = GetElementByID('#getFlyerInfo.price#');

}

</script>
</cfoutput>
<cfquery name="getFlyerDate" datasource="mydatasource">
      select * from flyer_campaign
</cfquery>
<cfoutput>

<p><strong>FLYER SUBMISSION PERIOD CLOSES #DateFormat(getFlyerDate.penddate, 'mm/dd/yyyy')#</strong>
You may return to this form and make changes anytime during the submission period.</p>

<p><strong>FLYER PUBLICATION DATES</strong>
Net Prices offered during this promotion will be effective <em>#DateFormat(getFlyerDate.startdate, 'mm/dd/yyyy')# - #DateFormat(getFlyerDate.enddate, 'mm/dd/yyyy')#</em>
<br />
      You may return to this form and make changes anytime during the submission period.</p>
</cfoutput>
<cfquery name="getVendorInfo" datasource="mydatasource">
      select * from flyer_vendor_campaigns where vcode = '#vcode#'
</cfquery>

<cfoutput>
<cfform method="post" action="flyer_step3.cfm" name="flyer">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="50%"></td>
    <table width="100%" height="133" border="0" cellpadding="0" cellspacing="0">
          <tr>
            <td width="50%" align="left" valign="top" class="selAdTypeTxtCopy">
            <table width="100%" border="0" align="left" cellpadding="3" cellspacing="1" class="page2Table">
              <tr>
                <td width="11%">Company</td>
                <td width="89%">#getVendorInfo.contact#</td>
              </tr>
              <tr>
                <td>Name</td>
                <td>#getVendorInfo.fullname#</td>
              </tr>
              <tr>
                <td>Email</td>
                <td>#getVendorInfo.email#</td>
              </tr>
              <tr>
                <td>Title</td>
                <td>#getVendorInfo.title#</td>
              </tr>
              <tr>
                <td>Phone</td>
                <td>#INSERT("-", INSERT("-", getVendorInfo.phone, 3), 7)#</td>
              </tr>
              <tr>
                <td>Fax</td>
                <td>#INSERT("-", INSERT("-", getVendorInfo.fax, 3), 7)#</td>
              </tr>
              <tr>
                <td>Freight Terms</td>
                <td>#getVendorInfo.freight_policy#</td>
              </tr>
              <tr>
                <td>Comments</td>
                <td>#getVendorInfo.comments#</td>
              </tr>
            </table></td>
            <td width="50%" align="left" valign="middle"><table width="60%" border="0" align="center" cellpadding="2" cellspacing="5">
              <tr>
                <td>Product Category</td>
                <td><cfselect name="product_category" id="product_category" onchange="javascript:PopulateMe(this)">
                  <option value="">-- Select Product Category --</option>
                  <cfloop query="getFlyerCat">
                  <option value="#getFlyerCat.fcid#"<cfif len(getFlyerInfo.fcid) gt 0 and getFlyerInfo.fcid is "#getFlyerInfo.fcid#"> selected</cfif>>#getFlyerCat.flyer_category#</option>
                  </cfloop>
                </cfselect></td>
              </tr><tr>
                <td>Ad Size</td>
                <td><cfselect name="page_size" id="page_size" onchange="javascript:PopulateMe(this)">
                  <option value="">-- Select Ad Size --</option>
                  <cfloop query="getFlyerSize">
                  <option value="#getFlyerSize.fsid#"<cfif len(getFlyerInfo.fsid) gt 0 and getFlyerInfo.fsid is "#getFlyerSize.fsid#"> selected</cfif>>#getFlyerSize.ad_size#</option>
                  </cfloop>
                </cfselect></td>
              </tr>
              <tr>
                              <td>Max Products</td>
                              <td><input type="text" name="max_products" value="#getFlyerInfo.max_products#" size="30"></td>
                        </tr>
                        <tr>
                              <td>Max Graphics</td>
                              <td><input type="text" name="max_images" value="#getFlyerInfo.max_images#" size="30"></td>
                        </tr>
                        <tr>
                              <td>Price</td>
                              <td><input type="text" name="price" value="#getFlyerInfo.price#" size="30"></td>
                        </tr>
              <tr>
                <td colspan="2" align="center"><cfinput type="submit" name="submit" value="Next ->>" /></td>
              </tr>
            </table></td>
          </tr>
      </table>
  </cfform>
 </cfoutput>

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您似乎没有调用您的函数。在不知道GetElementByID函数的功能的情况下，我想说您误解了javascript和CF的工作方式。Javascript在客户端上运行，在服务器执行CF代码之后很久。如果要从服务器检索其他/新数据，则必须提交一个新的http请求（通常使用ajax）。