好的,如果你看一下editsessionteacher.php脚本,它包含下面的代码,它在下拉菜单中显示以下值:
$outputmodule = "";
$moduleInfo = explode("_", $_POST['modules']);
$moduleId = $moduleInfo[0];
$moduleName = $moduleInfo[1];
$outputmodule = sprintf("<p><strong>Module:</strong> %s - %s</p>", $moduleId, $moduleName);
module.php是这样的:
$course = isset($_POST['course']) ? $_POST['course'] : '';
$sql = "
SELECT cm.CourseId, cm.ModuleId,
c.CourseName,
m.ModuleName
FROM Course c
INNER JOIN Course_Module cm ON c.CourseId = cm.CourseId
JOIN Module m ON cm.ModuleId = m.ModuleId
WHERE
(c.CourseId = ?)
ORDER BY c.CourseId, m.ModuleId
";
$sqlstmt=$mysqli->prepare($sql);
$sqlstmt->bind_param("s",$course);
$sqlstmt->execute();
$sqlstmt->bind_result($dbCourseId,$dbModuleId,$dbCourseName,$dbModuleName);
$moduleHTML = "";
while($sqlstmt->fetch()) {
$moduleHTML .= sprintf('<option value="%1$s_%2$s">%1$s - %2$s</option>'.PHP_EOL, $dbModuleId, $dbModuleName);
}
echo $moduleHTML;
$sqlstmt->execute();
修改
但是我想将moduleNo添加到下拉菜单中,所以当我尝试将代码更改为以下内容时,它不起作用:
editsessionteacher.php:
$sql = "SELECT CourseId, CourseNo, CourseName FROM Course";
$sqlstmt=$mysqli->prepare($sql);
$sqlstmt->execute();
$sqlstmt->bind_result($dbCourseId, $dbCourseNo, $dbCourseName);
$courses = array(); // easier if you don't use generic names for data
$courseHTML = "";
$courseHTML .= '<select name="courses" id="coursesDrop" onchange="getModules();">'.PHP_EOL;
$courseHTML .= '<option value="">Please Select</option>'.PHP_EOL;
while($sqlstmt->fetch())
{
$courseno = $dbCourseNo;
$course = $dbCourseId;
$coursename = $dbCourseName;
$courseHTML .= "<option value='".$course."'>" . $courseno . " - " . $coursename . "</option>".PHP_EOL;
}
$courseHTML .= '</select>';
$moduleHTML = "";
$moduleHTML .= '<select name="modules" id="modulesDrop">'.PHP_EOL;
$moduleHTML .= '<option value="">Please Select</option>'.PHP_EOL;
$moduleHTML .= '</select>';
?>
<script type="text/javascript">
function getModules() {
var course = jQuery("#coursesDrop").val();
jQuery('#modulesDrop').empty();
jQuery('#modulesDrop').html('<option value="">Please Select</option>');
jQuery.ajax({
type: "post",
url: "module.php",
data: { course:course },
success: function(response){
jQuery('#modulesDrop').append(response);
}
});
}
</script>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post" onsubmit="return validation();">
<table>
<tr>
<th>Course: <?php echo $courseHTML; ?></th>
<th>Module: <?php echo $moduleHTML; ?></th>
</tr>
</table>
<p><input id="moduleSubmit" type="submit" value="Submit Course and Module" name="moduleSubmit" /></p>
</form>
<?php
if (isset($_POST['moduleSubmit'])) {
$outputmodule = "";
$moduleInfo = explode("_", $_POST['modules']);
$moduleId = $moduleInfo[0];
$moduleNo = $moduleInfo[1];
$moduleName = $moduleInfo[2];
$outputmodule = sprintf("<p><strong>Module:</strong> %s - %s</p>", $moduleNo, $moduleName);
....
module.php:
$course = isset($_POST['course']) ? $_POST['course'] : '';
$sql = "
SELECT cm.CourseId, cm.ModuleId, c.CourseNo, m.ModuleNo,
c.CourseName,
m.ModuleName
FROM Course c
INNER JOIN Course_Module cm ON c.CourseId = cm.CourseId
JOIN Module m ON cm.ModuleId = m.ModuleId
WHERE
(c.CourseId = ?)
ORDER BY c.CourseId, m.ModuleId
";
$sqlstmt=$mysqli->prepare($sql);
$sqlstmt->bind_param("s",$course);
$sqlstmt->execute();
$sqlstmt->bind_result($dbCourseId,$dbModuleId,$dbCourseNo,$dbModuleNo,$dbCourseName,$dbModuleName);
$moduleHTML = "";
$moduleHTML .= '<select name="modules" id="modulesDrop">'.PHP_EOL;
$moduleHTML .= '<option value="">Please Select</option>'.PHP_EOL;
while($sqlstmt->fetch()) {
$moduleHTML .= sprintf('<option value="%1$s">%2$s - %3$s</option>'.PHP_EOL, $dbModuleId, $dbModuleNo, $dbModuleName);
}
$moduleHTML .= '</select>';
echo $moduleHTML;
我的问题是,当我更改代码以添加模块编号时,为什么它不会在下拉菜单中显示任何内容。
答案 0 :(得分:0)
我不明白为什么您的下拉菜单没有显示,但我确实看到您修改后的module.php
sprintf()
存在问题,以及它在editsessionteacher.php
中的显示方式。< / p>
原始module.php
sprintf()
传递了2个使用'_'连接的值
$moduleHTML .= sprintf('<option value="%1$s_%2$s">%1$s - %2$s</option>'.PHP_EOL, $dbModuleId, $dbModuleName);
---------
和您的editsessionteacher.php
explode()
这两个值
$moduleInfo = explode("_", $_POST['modules']);
$moduleId = $moduleInfo[0];
$moduleName = $moduleInfo[1];
但您修改后的module.php
sprintf()
只传递了1个值 -
$moduleHTML .= sprintf('<option value="%1$s">%2$s - %3$s</option>'.PHP_EOL, $dbModuleId, $dbModuleNo, $dbModuleName);
-----
但您的editsessionteacher.php
正在尝试explode()
3个值
$moduleInfo = explode("_", $_POST['modules']);
$moduleId = $moduleInfo[0];
$moduleNo = $moduleInfo[1];
$moduleName = $moduleInfo[2];
基于editsessionteacher.php
explode()
,请尝试将module.php
sprintf()
更新为 -
$moduleHTML .= sprintf('<option value="%1$s_%2$s_%3$s">%2$s - %3$s</option>'.PHP_EOL, $dbModuleId, $dbModuleNo, $dbModuleName);
--------------