关于php：为什么使用AJAX提交的表单会重定向到下一页，并且错误/成功消息不会在同一页面上显示为警报？

Why the form submitted using AJAX is redirecting to next page and the error/success messages are not displayed into alert on the same page?

我正在为我的网站使用php、smarty、jquery、ajax等。下面是我使用ajax提交的表单的HTML代码：

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<form name="question_issue_form" id="question_issue_form" action="http://localhost/xyz/pqr/web/control/modules/questions/question_issue.php">
<input type="hidden" name="form_submitted" id="form_submitted" value="yes"/>
<input type="hidden" name="op" id="op" value="question_issue"/>
<input type="hidden" name="question_id" id="question_id" value="35718"/>

<table class="trnsction_details" width="100%" cellpadding="5">
<tbody>
<tr>
<td></td>
<td>
<input type="checkbox" name ="que_issue[]" value ="Question is wrong" id ="chkQueWrong">Question is wrong</input>
</td>
</tr>
<tr>
<td></td>
<td><input type="checkbox" name ="que_issue[]" value ="Answers are wrong" id ="chkAnsWrong">Answers are wrong</input></td>
</tr>
<tr>
<td></td>
<td><input type="checkbox" name ="que_issue[]" value ="Question direction is incorrect" id ="chkDirIncorrect">Question direction is incorrecct</input></td>
</tr>
<tr>
<td></td>
<td><input type="checkbox" name ="que_issue[]" value ="Other" id ="chkOther">Other</input></td>
</tr>
<tr>
<td></td>
<td class="set_message" style="display:none;"><textarea name="que_issue_comment" id ="que_issue_comment" rows="4" cols="25" maxlength="100"></textarea></td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="submit" value="Submit" id="report_question_issue" class="c-btn submit_form"/></td>
</tr>
</tbody>
</table>
</form>

提交表单的Ajax代码如下：

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$(document).ready(function() {
$('#question_issue_form').submit(function() {
var ans = confirm("Are you sure to report the question issue?");
if (!ans) {
return false;
}
var post_url = $(this).attr('action');
$.ajax({
type:"POST",
url: post_url,
data: $('#question_issue_form').serialize(),
dataType: 'json',
success: function(data) { alert(data);
var error = data.error_message;
if(error)
alert(error);
else {
alert("Question issue has been reported successfully.");
$.colorbox.close();
}
}
});
});
});

我提交此表单的文件(questionu issue.php)的php代码如下：

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<?php
require_once("../../includes/application-header.php");

$objQuestionIssue = new QuestionIssue();

prepare_request();
$request = $_POST ;
$user_type = $_SESSION[SESSION_NAME_CONTROL][STAFF_TYPE];

if($user_type == 'super_admin' || $user_type == 'admin' || $user_type == 'data_entry_operator' || $user_type == 'owner' || $user_type == 'faculty' || $user_type == 'content_development_head' || $user_type == 'test_admin' || $user_type == 'student_admin')
$requested_user_type = 'staff';
else
$requested_user_type = 'student';

$form_data = array();
$form_data['question_id'] = $request['question_id'];
$form_data['reported_site_id'] = SITE_ID;
$form_data['reported_user_type'] = $requested_user_type;
$form_data['reported_user_id'] = $_SESSION[SESSION_NAME_CONTROL][STAFF_ID];
$form_data['que_issue'] = implode(",", $request['que_issue']);
$form_data['que_issue_comment'] = $request['que_issue_comment'];
$form_data['que_issue_date'] = time();
switch( $op ) {
case"question_issue":
if($request['form_submitted']=='yes') {
$ret = $objQuestionIssue->InsertQuetionIssue($form_data, $question_issue_error_messages);
/*If condition : If there are any errors in submission of a report question form*/
if(!$ret) {
$error_msg = $objQuestionIssue->GetAllErrors();
$data = array();
$data['error_message'] = $error_msg['error_msgs'];
$data = json_encode($data);
echo $data;
die;
/*Else condition : If there is no error in submission of a report question form*/
} else {
$data = array();
$data['success_message'] ="success";
$data = json_encode($data);
echo $data;
die;
}
} else {
$smarty->assign('question_id', $request['question_id']);
$file_to_show = 'question-issue.tpl';
}
$smarty->display($file_to_show);
break;
die;
}
?>

我面临的问题是，当我单击确认警报的OK按钮时，表单将被提交，但JSON格式的错误消息或成功消息将显示在空白屏幕上。

实际上，它们应该出现在弹出的警告中，页面不应该重定向到其他URL。但是错误/成功消息打印在空白的白页上，页面也被重定向到question_issue.php。有人能帮我避免这些事情并将错误/成功消息显示在同一页的警告框中吗？

我认为您应该防止表单的默认行为，因此它不会真正提交，而是只要求JSON：

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$('#question_issue_form').submit(function(e) {
e.preventDefault();
// your code