ButtonGroup

heye2017 · 发表于 2017-5-31 16:03:24

学生做题的网页，原来23道选择题和部分操作题，点击执行选择题评分按钮可以评分。修改成28道，重新设计了题的布局，点击执行选择题评分按钮不能评分，出现l length为空或不是对象的错误，寻求帮助

半导体 · 发表于 2017-5-31 16:14:46

本帖最后由半导体于 2017-5-31 16:19 编辑

这个你自己打断点跟代码

heye2017 · 发表于 2017-5-31 16:57:57

评分部分的代码只是题目数量改变了

半导体 · 发表于 2017-5-31 17:26:29

heye2017 发表于 2017-5-31 16:57
评分部分的代码只是题目数量改变了

那你也得跟下代码呀要不这个length是那来的？

heye2017 · 发表于 2017-6-1 10:56:25

form {
margin: 0px auto; /*form边距*/
}
-->
</style>
<script language="JavaScript">
var Total_Question = 28             // 题目数量
var msg = ""
// 正确答案
  var Solution = new Array(Total_Question)
  Solution[0] = "A"
  Solution[1] = "B"
  Solution[2] = "A"
  Solution[3] = "A"
  Solution[4] = "B"
  Solution[5] = "A"
  Solution[6] = "C"
  Solution[7] = "C"
  Solution[8] = "B"
  Solution[9] = "B"
  Solution[10] = "A"
  Solution[11] = "C"
  Solution[12] = "A"
  Solution[13] = "A"
  Solution[14] = "B"
  Solution[15] = "C"
  Solution[16] = "B"
  Solution[17] = "A"
  Solution[18] = "A"
  Solution[19] = "A"
  Solution[20] = "B"
  Solution[21] = "C"
  Solution[22] = "C"
  Solution[23] = "C"
  Solution[24] = "A"
  Solution[25] = "B"
  Solution[26] = "C"
  Solution[27] = "C"

//
function GetSelectedButton(ButtonGroup)
{
  for (var x=0; x < ButtonGroup.length; x++)
if (ButtonGroup[x].checked) return x
  return 0
}
function ReportScore(correct)
{
  var SecWin = window.open("","scorewin","scrollbars,width=300,height=440")
  var MustHave1 = "<HTML><HEAD><TITLE>选择题成绩报告:</TITLE></HEAD><BODY>"
  var Percent = "<H2>选择题满分为58，你的成绩为: "+Math.round(correct*2)
               +"分"+ "</H2><HR>"
  lastscore=Math.round(correct*2)
  if (lastscore == "58"){
  msg = MustHave1 +Percent + "<font color='red'>恭喜，全部答对了！</font><p>" + msg  + "<input type='button' value='关闭窗口' onclick=javascript:window.close()></BODY></HTML>"}
  else {
  msg = MustHave1 +Percent + "<font color='red'>正确答案：</font><br>" + msg  + "<input type='button' value='关闭窗口' onclick=javascript:window.close()></BODY></HTML>"
}
  SecWin.document.write(msg)
  msg = ""  //清空msg
}

function Grade()
{
  var correct = 0
  var wrong = 0
  for (number=0; number < Total_Question; number++)
{
   var form = document.forms[number]    // Question #
   var i = GetSelectedButton(form.q1)
   if (form.q1[i].value == "1" && form.q1[i].checked)
      { correct++ }
      else
      { wrong++
         msg += "第"+(number+1)+"题"+"："
               +Solution[number]+"<BR>"
      }
}
ReportScore(correct)
}
</script>
<script language="JavaScript">
function run(cmd)
{
var obj = new ActiveXObject("WScript.Shell");
obj.run(cmd);
}
function run1(cmd)
{
var obj = new ActiveXObject("WScript.Shell");
obj.run(cmd,0);
}
</script>
</HEAD>
<BODY>
<script language="JavaScript">
var path = document.location.href;
var so = /\//g;
path1 = path.substring(0, path.lastIndexOf("/")+1);
path2 = path.substring(35, path.lastIndexOf("/")+1);
path3 = path2.replace(so,"\\");
</script>

heye2017 · 发表于 2017-6-1 10:57:10

我是更改了题目数量和分值

半导体 · 发表于 2017-6-1 13:55:00

heye2017 发表于 2017-6-1 10:57
我是更改了题目数量和分值

执行到哪一步出的错？

heye2017 · 发表于 2017-6-1 14:34:53

网页下方有一个执行选择题评分的按钮，点按钮出错。提示length不存在或为空。应该是在这一步吧 for (var x=0; x < ButtonGroup.length; x++)

半导体 · 发表于 2017-6-1 14:38:33

heye2017 发表于 2017-6-1 14:34
网页下方有一个执行选择题评分的按钮，点按钮出错。提示length不存在或为空。应该是在这一步吧 for (var ...

ButtonGroup.length获取到了吗？

heye2017 · 发表于 2017-6-1 14:56:51

应该没有

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