可能重复：
遇到函数结构不遵循的问题（PHP）
问题：每次我提交按钮时，它都不会在函数answerSubmit中显示回声，而是返回到函数。student answersStudentAnswers()pickSession()
我在这里有一个演示，你可以用它来看看发生了什么：DEMO
当您打开演示时，从评估（会话）下拉菜单中选择评估。您将看到另外 2 个下拉菜单students并questions出现下拉菜单。现在，如果您单击answerSubmit按钮（Get Students Answers按钮），那么它应该显示回声说明student answers，但是您可以看到它返回到仅显示评估下拉菜单。为什么是这样？
下面是演示的代码：
function PickSession()
{
//mysqli code retreiving data for options in assessments drop down menu goes here ....
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>
<strong>Asessments:</strong>
<select name="session" id="sessionsDrop">
<option value="">Please Select</option>
<?php
while ( $sessionqrystmt->fetch() ) {
$sv = $dbSessionId;
if(isset($_POST["session"]) && $sv == $_POST["session"])
echo "<option selected='selected' value='$sv'>" .
$dbSessionName .
" - " .
date('d-m-Y',strtotime($dbSessionDate)) .
" - " .
date('H:i',strtotime($dbSessionTime)) .
"</option>" . PHP_EOL;
else
echo "<option value='$sv'>" .
$dbSessionName .
" - " .
date('d-m-Y',strtotime($dbSessionDate)) .
" - " .
date('H:i',strtotime($dbSessionTime)) .
"</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="sessionSubmit" type="submit" value="Submit Assessments" name="sessionSubmit" />
</form>
<?php
}
function SessionIsSubmitted()
{
if(isset($_POST['sessionSubmit'])) // we have subbmited the second form
{
if(empty($_POST["session"])) // We picked the "Please select" option
{ ?>
Please Select an Assessment
<?php
return false;
}
else // All is ok
{
return true;
}
}
return false;
}
function ShowAssessment()
{
//mysqli code retreiving data for options in students drop down menu goes here ....
if($studentnum == 0){ ?>
There are no Students who have currently taken this Assessment
<?php } else {
//mysqli code retreiving data for options in questions drop down menu goes here ....
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>
<strong>Student:</strong>
<select name="student" id="studentsDrop">
<option value="All">All</option>
<?php
while ( $currentstudentstmt->fetch() ) {
$stu = $dbStudentId;
if(isset($_POST["student"]) && $stu == $_POST["student"])
echo "<option selected='selected' value='$stu'>" .
$dbStudentAlias . " - " . $dbStudentForename . " " .
$dbStudentSurname . "</option>" . PHP_EOL;
else
echo "<option value='$stu'>" . $dbStudentAlias . " - " .
$dbStudentForename . " " . $dbStudentSurname .
"</option>" . PHP_EOL;
}
?>
</select>
</p>
<p>
<strong>Question:</strong>
<select name="question" id="questionsDrop">
<option value="All">All</option>
<?php
while ( $questionsstmt->fetch() ) {
$ques = $dbQuestionId;
if(isset($_POST["question"]) && $ques == $_POST["question"])
echo "<option selected='selected' value='$ques'>" .
$dbQuestionNo . "</option>" . PHP_EOL;
else
echo "<option value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="answerSubmit" type="submit" value="Get Student's Answers" name="answerSubmit" />
</form>
<?php
}
}
function StudentAnswersIsSubmitted()
{
if(isset($_POST['answerSubmit'])) // we have subbmited the second form
{
return false;
}
return false;
}
function StudentAnswers()
{
echo "student answers";
}
?>
...
<body>
<?php
PickSession(); // Show the thing to pick session
if(SessionIsSubmitted()) // When session is picked
{
ShowAssessment(); // Show students and questions information
if(StudentAnswersIsSubmitted()) // Student Answers button is submitted
{
StudentAnswers();
}
}
?>
</body>
更新：
function PickSession()
{
//mysqli code retreiving data for options in assessments drop down menu goes here ....
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>
<strong>Asessments:</strong>
<select name="session" id="sessionsDrop">
<option value="">Please Select</option>
<?php
while ( $sessionqrystmt->fetch() ) {
$sv = $dbSessionId;
if(isset($_POST["session"]) && $sv == $_POST["session"])
echo "<option selected='selected' value='$sv'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
else
echo "<option value='$sv'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="sessionSubmit" type="submit" value="Submit Assessments" name="sessionSubmit" />
</form>
<?php
}
function SessionIsSubmitted()
{
if(isset($_POST["session"]) && empty($_POST["session"])) // We picked the "Please select" option
{ ?>
<div class="red">
Please Select an Assessment
</div>
<?php
return false;
}
else if(!isset($_POST["session"]))
{
return false;
}
else // All is ok
{
return true;
}
return false;
}
function ShowAssessment()
{
//mysqli code retreiving data for options in students drop down menu goes here ....
if($studentnum == 0){ ?>
There are no Students who have currently taken this Assessment
<?php } else {
//mysqli code retreiving data for options in questions drop down menu goes here ....
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>
<input type="text" name="session" value="<?php echo $_POST['session']; ?>">
<strong>Student:</strong>
<select name="student" id="studentsDrop">
<option value="All">All</option>
<?php
while ( $currentstudentstmt->fetch() ) {
$stu = $dbStudentId;
if(isset($_POST["student"]) && $stu == $_POST["student"])
echo "<option selected='selected' value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
else
echo "<option value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<p>
<strong>Question:</strong>
<select name="question" id="questionsDrop">
<option value="All">All</option>
<?php
while ( $questionsstmt->fetch() ) {
$ques = $dbQuestionId;
if(isset($_POST["question"]) && $ques == $_POST["question"])
echo "<option selected='selected' value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
else
echo "<option value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="answerSubmit" type="submit" value="Get Student's Answers" name="answerSubmit" />
</form>
<?php
}
}
function StudentAnswersIsSubmitted()
{
if(!isset($_POST["answerSubmit"]))
{
return false;
}
else // All is ok
{
return true;
}
return false;
}
?>
更新 2：
这是以下代码的演示：演示
function PickModule()
{ ?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<?php
$moduleactive = 1;
$sql = "SELECT ModuleId, ModuleNo, ModuleName FROM Module WHERE ModuleActive = ? ORDER BY ModuleNo";
//mysqli code for modules drop down menu
?>
<strong>Module:</strong>
<select name="module" id="modulesDrop">
<option value="">Please Select</option>
<?php
while($sqlstmt->fetch()) {
$ov = $dbModuleNo . "_" . $dbModuleName . "_" . $dbModuleId;
if(isset($_POST["module"]) && $ov == $_POST["module"])
echo "<option selected='selected' value='$ov'>$dbModuleNo - $dbModuleName</option>" . PHP_EOL;
else
echo "<option value='$ov'>$dbModuleNo - $dbModuleName</option>" . PHP_EOL;
}
?>
</select>
<br>
<input id="moduleSubmit" type="submit" value="Submit Module" name="moduleSubmit" />
</form>
<?php }
function ModuleIsSubmitted()
{
if(isset($_POST["module"]) && empty($_POST["module"])) // We picked the "Please select" option
{ ?>
Please Select a Module
<?php
return false;
}
else if(!isset($_POST["module"]))
{
return false;
}
else // All is ok
{
return true;
}
return false;
}
function PickSession()
{
$dataTransfered = explode( "_" , $_POST["module"] );
$moduleNo = $dataTransfered[0];
$moduleName = $dataTransfered[1];
$moduleId = $dataTransfered[2];
//Get data from database
$sessionquery = "
SELECT s.SessionId, SessionName, SessionDate, SessionTime, ModuleId, SessionActive, Complete
FROM Session s
INNER JOIN Session_Complete sc ON sc.SessionId = s.SessionId
WHERE
(ModuleId = ? AND Complete = ?)
ORDER BY SessionName
";
$complete = 1;
//mysqli code for assessments drop down menu
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<input type="hidden" name="module" value="<?php echo $_POST['module']; ?>">
<p>
<strong>Selected Module: </strong><?php echo $moduleNo ." - ". $moduleName; ?>
</p>
<?php if ($sessionnum == 0 ){ ?>
<div class="red">
Sorry, You have No Assessments under this Module
</div>
<?php } else { ?>
<p>
<strong>Asessments:</strong>
<select name="session" id="sessionsDrop">
<option value="">Please Select</option>
<?php
while ( $sessionqrystmt->fetch() ) {
$sv = $dbSessionId;
if($dbSessionActive == 0){
$class = 'red';
}else{
$class = 'green';
}
if(isset($_POST["session"]) && $sv == $_POST["session"])
echo "<option selected='selected' value='$sv' class='$class'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
else
echo "<option value='$sv' class='$class'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="sessionSubmit" type="submit" value="Submit Assessments" name="sessionSubmit" />
</form>
<?php
}
}
function SessionIsSubmitted()
{
if(isset($_POST["session"]) && empty($_POST["session"])) // We picked the "Please select" option
{ ?>
<div class="red">
Please Select an Assessment
</div>
<?php
return false;
}
else if(!isset($_POST["session"]))
{
return false;
}
else // All is ok
{
return true;
}
return false;
}
function ShowAssessment()
{
$studentactive = 1;
$currentstudentqry = "
SELECT
st.StudentId, st.StudentAlias, st.StudentForename, st.StudentSurname
FROM
Student_Session ss
INNER JOIN
Student st ON ss.StudentId = st.StudentId
WHERE
(ss.SessionId = ? AND st.Active = ?)
ORDER BY st.StudentAlias
";
//mysqli code for students drop down menu
if($studentnum == 0){ ?>
<div class="red">
There are no Students who have currently taken this Assessment
</div>
<?php } else {
$questionsqry = "
SELECT
QuestionId, QuestionNo
FROM
Question
WHERE
(SessionId = ?)
ORDER BY QuestionNo
";
//mysqli code for questions drop down menu
?>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<p>
<input type="text" name="session" value="<?php echo $_POST['session']; ?>">
<strong>Student:</strong>
<select name="student" id="studentsDrop">
<option value="All">All</option>
<?php
while ( $currentstudentstmt->fetch() ) {
$stu = $dbStudentId;
if(isset($_POST["student"]) && $stu == $_POST["student"])
echo "<option selected='selected' value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
else
echo "<option value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<p>
<strong>Question:</strong>
<select name="question" id="questionsDrop">
<option value="All">All</option>
<?php
while ( $questionsstmt->fetch() ) {
$ques = $dbQuestionId;
if(isset($_POST["question"]) && $ques == $_POST["question"])
echo "<option selected='selected' value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
else
echo "<option value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
}
?>
</select>
</p>
<input id="answerSubmit" type="submit" value="Get Student's Answers" name="answerSubmit" />
</form>
<?php
}
}
function StudentAnswersIsSubmitted()
{
if(!isset($_POST["answerSubmit"]))
{
return false;
}
else // All is ok
{
return true;
}
return false;
}
function StudentAnswers()
{
echo "student answers";
}
?>
…………
<?php
PickModule(); // Show the thing to pick module
if(ModuleIsSubmitted()) // When module is picked
{
PickSession(); // Show the thing to pick session
if(SessionIsSubmitted()) // When session is picked
{
ShowAssessment(); // Show students and questions information
if(StudentAnswersIsSubmitted()) // Student Answers button is submitted
{
StudentAnswers();
}
}
}
?>