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Perl CGI和JavaScript | 選擇選項麻煩

[英]Perl CGI & JavaScript | Select Option troubles

我很難確定下面的代碼為什么不起作用:

test.cgi:

#!/usr/bin/perl -w

use CGI;

$cgi = new CGI;
$cgi->autoEscape(undef);
        %ptype = ("0","","1","Pennsylvania","2","New York","3","Ohio");
print   $cgi->header('text/html'),
        $cgi->start_html(-title=>'Test',-script=>[{-type=>'javascript',-src =>'/scripts/test.js'}]),
        $cgi->start_form(-method=>'GET',id=>'frmMain',-name=>'frmMain',-enctype=>'multipart/form-data'),
        $cgi->popup_menu(-style=>'width:200',name=>'ProblemType',-values=>\%ptype,-onChange=>'PopulateSType()',-default=>'0'),
        $cgi->popup_menu(-style=>'width:200',name=>'SubProblemType',-values=>''),
        $cgi->end_form,
        $cgi->end_html();

test.js:

function PopulateSType() {

   var ProblemList = document.frmMain.ProblemType;
   ClearOptions(document.frmMain.SubProblemType);

   if (ProblemList[ProblemType.selectedIndex].value == "1") {
      AddToOptionList(document.frmMain.SubProblemType, "0", "");
      AddToOptionList(document.frmMain.SubProblemType, "1", "Pittsburgh");
      AddToOptionList(document.frmMain.SubProblemType, "2", "Philadelphia");
      AddToOptionList(document.frmMain.SubProblemType, "3", "Harrisburg");
   }
   if (ProblemList[ProblemType.selectedIndex].value == "2") {
      AddToOptionList(document.frmMain.SubProblemType, "0", "");
      AddToOptionList(document.frmMain.SubProblemType, "1", "New York");
      AddToOptionList(document.frmMain.SubProblemType, "2", "Buffalo");
      AddToOptionList(document.frmMain.SubProblemType, "3", "Middletown");
   }
   if (ProblemList[ProblemType.selectedIndex].value == "3") {
      AddToOptionList(document.frmMain.SubProblemType, "1", "Cleveland");
      AddToOptionList(document.frmMain.SubProblemType, "2", "Cincinatti");
      AddToOptionList(document.frmMain.SubProblemType, "3", "Akron");
   }
}

function ClearOptions(OptionList) {
   for (x = OptionList.length; x >= 0; x = x - 1) {
      OptionList[x] = null;
   }
}

function AddToOptionList(OptionList, OptionValue, OptionText) {
   OptionList[OptionList.length] = new Option(OptionText, OptionValue);
}

樣本源輸出:

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-US"><head><title>Process Alarm</title>
<script language="JavaScript" src="/scripts/test.js" type="javascript"></script>
</head><body><form method="get" action="/cgi-bin/test.cgi/test.cgi?null" enctype="multipart/form-data" name="frmMain" id="frmMain">
<select name="ProblemType" onchange="PopulateSType()" style="width:200">
<option value="1">Pennsylvania</option>
<option value="3">Ohio</option>
<option selected="selected" value="0"></option>
<option value="2">New York</option>
</select><select name="SubProblemType" style="width:200">
<option value=""></option>

</select></form></body></html>

看起來一切正常,但是,當我加載頁面時,第二個選擇選項按鈕沒有任何反應。 如果在頁面加載時應用了寬度樣式,則似乎是命中注定的問題。 我什至嘗試過window.onload = load; 在test.js的頂部。 我所看到的唯一可能是不對的是perl,是將onChange格式化為onchange。

Java在常規HTML中運行良好,試圖在perl中實現它似乎只是有問題。 我從這里使用一個例子

<script language="JavaScript" src="/scripts/test.js" type="javascript">

它應該是type="text/javascript" ,這是瀏覽器支持的JS的MIME媒體類型。 本身不會識別type="javascript" language="javascript"已過時。)

style="width:200"

應該是200px

for (x = OptionList.length; x >= 0; x = x - 1) {
   OptionList[x] = null;
}

不確定null是否可以正常工作。 傳統的快速成語是:

OptionList.length= 0;

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