我的应用程序中有 2 个选择框。现在,当用户提交页面时,所有在选择框中被选中(突出显示)的学生#studentadd
都会被附加到#studentselect
选择框。但未在第一个选择框中选择的选项不会附加到第二个选择框中。
我的问题是如何在“#studentadd”选择框中获得未选择的选项以附加到“#studentselect”选择框中?
是我的 php/ajax 的问题,因为我所做的是使用 ajax 导航到单独的 php 文件并将#studentadd
选择框中的学生插入数据库。但是插入只发生在#studentdd
选择框中的那些学生荧光笔上。它不会对那些在 `#studentadd' 中未选择的选项执行插入操作。
下面是选择框#studentadd
:
<select multiple="multiple" name="addtextarea" id="studentadd" size="10">
<option value='1'>u08743 - Joe Cann</option>
<option value='4'>u03043 - Jill Sanderson</option>
<option value='7'>u08343 - Craig Moon</option>
</select>
以下是学生应附加到的选择框:
<select id="studentselect" name="studenttextarea"></select>
下面是jquery/ajax:
function submitform() {
$.ajax({
type: "POST",
url: "updatestudentsession.php",
data: {
addtextarea:$('#studentadd').val()
},
dataType:'json', //get response as json
success: function(result){
if(result.errorflag){
//do your stuff on getting error message
var newHtml="<span style='color: red'>"+result.msg+"</span>";
$("#targetdiv").html(newHtml); //i am displaying the error msg here
$('#targetdiv').show();
}else{
//you got success message
var newHtml="<span style='color: green'>"+result.msg+"</span>";
$("#targetdiv").html(newHtml);
//append students you want to add to assessment into student exist select box
var selectedOption = $('select#studentadd');
$('select#studentselect').append(selectedOption.html());
//blank #studentadd select box
$('#studentadd').empty();
$('#targetdiv').show();
}
}
});
}
下面是updatestudentsession.php
从 ajax 访问并将数据插入数据库的单独 php 文件:
$studentid = (isset($_POST['addtextarea'])) ? $_POST['addtextarea'] : array();
$sessionid = (isset($_POST['Idcurrent'])) ? $_POST['Idcurrent'] : array();
$insertsql = "
INSERT INTO Student_Session
(SessionId, StudentId)
VALUES
(?, ?)
";
if (!$insert = $mysqli->prepare($insertsql))
{
// Handle errors with prepare operation here
}
$success = true;
foreach($studentid as $id)
{
$insert->bind_param("ii", $sessionid, $id);
if($insert->execute() === false)
{
$success = false;
}
}
$insert->close();
if($success)
{
echo json_encode(array('errorflag'=>false,'msg'=>"Students have been successfully added into the Assessment"));
}
else
{
echo json_encode(array('errorflag'=>true,'msg'=>"An error has occured, Students have not been added into the Assessment"));
}