我正在尝试创建动态 html 表，但问题是它没有在表中显示任何数据。我知道查询是正确的，因为我在 sql 中测试了查询并输出了数据。我猜的问题是动态 html 表本身。下面是代码：
JavaScript/JQuery：
//javascript below will perform calculation between adding numbers between text inputs per each question
//answer for each calculation per question is stored under "Total Marks Remaining" Column
/*If a question only has one answer, then the text input under the "Marks Per Answer" column becomes
read only and displays the same number as the total marks under the "Total Marks Remaining" column
for that question*/
$(function() {
//alert("here");
var questions = $('#markstbl td[class*="_ans"]').length-1;
//disable single entry
for (var i=0;i<=questions;i++){
if($("[class*=q"+i+"_mark]").length ==1){
var t_marks = $("[class*=q"+i+"_ans]").html();
//alert(t_marks);
$("[class*=q"+i+"_mark]").val(t_marks).attr("disabled","disabled");
//$("[class*=q"+i+"_mark]").attr("disabled","disabled");
}
}
//find each question set and add listeners
for (var i=0;i<=questions;i++){
$('input[class*="q'+i+'"]').keyup(function(){
var cl = $(this).attr('class').split(" ")[1]
var questionno = cl.substring(cl.indexOf('q')+1,cl.indexOf('_'));
var tot_marks = $(".q"+questionno+"_ans_org").val();
//alert(tot_marks);
var ans_t=0;
$("[class*=q"+questionno+"_mark]").each(function(){
var num = (isNaN(parseInt($(this).val())))?0:parseInt($(this).val());
ans_t+=parseInt(num);
});
ans_t=tot_marks-ans_t;
//alert(ans_t);
//var fixedno = tot_marks;
var ans = (parseInt(ans_t)<0)?tot_marks:ans_t;
$(".q"+questionno+"_ans").val(ans);
$(".q"+questionno+"_ans_text").html(ans);
});
}
});
</script>
PHP：
<?php
if (isset($_POST['id'])) {
$_SESSION['id'] = $_POST['id'];
}
$assessment = $_SESSION['id'];
include('connect.php');
$query = "SELECT q.SessionId, s.SessionName, q.QuestionId, q.QuestionContent, an.Answer, q.QuestionMarks
FROM Session s
INNER JOIN Question q ON s.SessionId = q.SessionId
JOIN Answer an ON q.QuestionId = an.QuestionId AND an.SessionId = q.SessionId
WHERE s.SessionName = ?
ORDER BY q.QuestionId, an.Answer";
// prepare query
$stmt=$mysqli->prepare($query);
// You only need to call bind_param once
$stmt->bind_param("s", $assessment);
// execute query
$stmt->execute();
// This will hold the search results
$searchQuestionId = array();
$searchQuestionContent = array();
$searchAnswer = array();
$searchMarks = array();
// Fetch the results into an array
// get result and assign variables (prefix with db)
$stmt->bind_result($dbSessionId, $dbSessionName, $dbQuestionId, $dbQuestionContent, $dbAnswer, $dbQuestionMarks);
while ($stmt->fetch()) {
$searchQuestionId[] = $dbQuestionId;
$searchQuestionContent[] = $dbQuestionContent;
$searchAnswer[] = $dbAnswer;
$searchMarks[] = $dbQuestionMarks;
}?>
HTML：
<form id="Marks" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<table border='1' id='markstbl'>
<thead>
<tr>
<th class='questionth'>Question No.</th>
<th class='questionth'>Question</th>
<th class='answerth'>Answer</th>
<th class='answermarksth'>Marks per Answer</th>
<th class='noofmarksth'>Total Marks</th>
</tr>
</thead>
<?php
$row_span = array_count_values($searchQuestionId);
$prev_ques = '';
foreach($searchQuestionId as $key=>$questionId){?>
<tbody>
<tr class="questiontd">
<?php
if($questionId != $prev_ques){?>
<td class="questionnumtd" name="numQuestion" rowspan="<?=$row_span[$questionId]?>"><?=$questionId?> <input type="hidden" name="q<?=$questionId?>_ans_org" class="q<?=$questionId?>_ans_org" value="<?=$searchMarks[$key]?>"><input type="hidden" name="q<?=$questionId?>_ans" class="q<?=$questionId?>_ans" value="<?=$searchMarks[$key]?>"></td>
<td class="questioncontenttd" rowspan="<?=$row_span[$questionId]?>"><?=$searchQuestionContent[$key]?> </td>
<?php
}else{?>
<td class="questionnumtd" name="numQuestion" ></td>
<td class="questioncontenttd" ></td>
<?php
}?>
<td class="answertd" name="answers[]"><?=$searchAnswer[$key]?></td>
<td class="answermarkstd">
<input class="individualMarks q<?=$questionId?>_mark_0" q_group="1" name="answerMarks[]" id="individualtext" type="text" />
</td>
<?php
if($questionId != $prev_ques){?>
<td class="noofmarkstd q<?=$questionId?>_ans_text" q_group="1" rowspan="<?=$row_span[$questionId]?>"><?=$searchMarks[$key]?></td>
<?php
}else{?>
<td class="noofmarkstd" q_group="1"></td>
<?php
}?>
</tr>
<?php
$prev_ques = $questionId;
}?>
</tbody>
</table>
</form>
下面是它显示的屏幕截图：
以下是表格应显示的内容（每个答案列的标记包含每行的文本输入）
以下是数据库设计，因此您可以查看数据的来源：
会话表：（存储考试详细信息的位置）
SessionId SessionName
1 AAA
问题表：（存储每个考试的问题）
SessionId QuestionId QuestionContent Total Marks
1 1 Name three features in a ROM 5
1 2 Here is a single answer 5
答案表：（存储每个考试中每个问题的答案）
AnswerId(auto) SessionId QuestionId Answer
1 1 1 A
2 1 1 B
3 1 1 D
4 1 2 True
Individual_Answer 表：（存储每个单独答案的每个单独标记）
AnswerId AnswerMarks
1 2
2 2
3 1
4 5
更新：
查看我的 html 代码，为什么它显示如下表格：
