这是我的代码
<html>
<head>
<title>
Aplikasi KRS
</title>
</head>
<body>
<p>IPK : 1.xx</p>
<form name="formTes" method="post">
<script>
function cekKrs()
{
var jum_sks = 0;
for(var i=0; i<7; i++)
{
if(document.formTes.elements[i].checked)
jum_sks += mataKuliah;
}
document.formTes.fieldJumlah.value = jum_sks;
if(jum_sks > 15)
{
alert("Anda harus mengurangi SKS\n karena melebihi 15 SKS");
}
}
function cekKirim()
{
if(document.formTes.fieldJumlah.value > 15)
alert("Anda harus mengurangi SKS\n karena melebihi 15 SKS");
else
window.location.href = "tesform.html";
}
</script>
<table border="2">
<tr><th>Kode</th><th>Mata Kuliah</th><th>SKS</th><th><Pilihan/th></tr>
<?php
include "koneksi.php";
$sql = "SELECT * FROM mata_kul";
$query = $con->query($sql);
while($mataKuliah = $query->fetch_array())
{
echo "<tr><td>". $mataKuliah['kodeMK'] ."</td>";
echo "<td>". $mataKuliah['namaMK'] ."</td>";
echo "<td>". $mataKuliah['sks'] ."</td>";
echo "<script>var mataKuliah= ".$mataKuliah['sks']."</script>";
echo "<td><input name='mk". $mataKuliah['kodeMK'] ."' type='checkbox' onclick='cekKrs()'></td>";
}
?>
<tr><td colspan="2" align="right">Jumlah SKS</td>
<td colspan="2"><input size="3" value="0" name="fieldJumlah" type="text" readonly="readonly"></td></tr></table>
<br>
<input type="button" name="tombolKirim" value="Kirim" onclick="cekKirim()">
</form>
</body>
</html>
我的问题是
“为什么当我单击清单时，它显示jumlah SKS中的sks的最后一个值，而不是我单击的sks检查值？例如当我单击清单中值为2的sks时，应在jumlah SKS中显示2而不是8”
这是图片
你能告诉我我哪里出问题了吗？我还很新
最佳答案
我猜您需要将复选框obj作为参数发送给cekKrs（），然后在函数cekKrs中评估obj是否被选中为+或-总计中的obj.value。
试试这个DEMO
HTML（草稿）
<table>
<!-- while($mataKuliah = $query->fetch_array())
{ -->
<tr>
<!-- echo "<td><input name='mk". $mataKuliah['kodeMK'] ."' type='checkbox' onclick='cekKrs(this)' value='".$mataKuliah['sks']."'></td>"; // PHP -->
<td><input type='checkbox' onclick='cekKrs(this)' value='1'>1</td>
</tr>
<tr>
<td><input type='checkbox' onclick='cekKrs(this)' value='2'>2</td>
</tr>
<tr>
<td><input type='checkbox' onclick='cekKrs(this)' value='3'>3</td>
</tr>
<!-- } -->
</table>
<input size="3" value="0" name="fieldJumlah" id='fieldJumlah' type="text" readonly="readonly">
onclick ='cekKrs（this）'发送复选框obj，并将mataKuliah的值保留在复选框值内
JS
function cekKrs(chkObj)
{
//Get current total
var jum_sks = parseInt(document.getElementById('fieldJumlah').value);
//Get checkbox value clicked
var mataKuliah = parseInt(chkObj.value);
//Evaluate check to + or -
if(!chkObj.checked)
{
mataKuliah = (mataKuliah * -1)
}
jum_sks += mataKuliah;
//Set new total
document.getElementById('fieldJumlah').value = jum_sks;
}