我一直在尝试为我正在开发的网站上传文件。我是在表单之外完成这项工作的，经过几天的搜索，我终于从这个问题的答案中找到了适合我的方法：
问题是，当我将代码应用到自己的脚本时，我就出现了"未定义索引"错误，当我删除它时，一切都很好。
这是我的代码：
HTML
<div class='error-msg'></div>
<input type='text' id='newsitem-message' />
<input type='file' id='newsitem-thumbnail' />
<div class='submit' onclick='newsItem('"insert'");'>Post news</div>
jQuery
function newsItem(action){
var thumbnail = $('#newsitem-thumbnail')[0].files[0];
var fileReader = new FileReader();
fileReader.readAsText(thumbnail, 'UTF-8');
fileReader.onload = shipOff;
function shipOff(e){
var r = e.target.result;
if(action == "insert"){
$.post("requestPages/newsitems.php", {message:$("#newsitem-message").val(),
thumbnail:thumbnail.name,
action:action,
data:r},
function(result){
console.log(result);
console.log(r); //This freezes my console/inspector window, forcing me to restart the browser-tab
if(result == "succes"){
window.location.reload();
}else{
$(".error-msg").html(result);
}
});
}else if(action == "delete"){
//To be implemented when I get the submit working D:
}
}
}
PHP（请原谅混乱-需要认真清理）
<?php
include("../assets/libs/SQLLib.php");
DB_Connect("test");
echo print_r($_POST);
echo var_dump($_POST);
$message = $_POST['message'];
$action = $_POST['action'];
$thumbnail = $_POST['thumbnail'];
$data = $_POST['data'];
$serverFile = time().$thumbnail;
$fp = fopen('../assets/images/thumbnails/'.$serverFile, 'w');
fwrite($fp, $data);
fclose($fp);
$returnData = array("serverFile" => $serverFile);
echo json_encode($returnData);
if($_POST['message'] != ""){
$canPost = true;
}else{
echo "The message can not be empty.";
}
if($action == "insert" && $canPost){
$sql = "insert into newsitems
(date, message, thumbnail)
values
(NOW(),'".$message."', '".$thumbnail."')";
$result = mysql_query($sql);
if(!$result){
echo "Uh-oh! Something went wrong while posting the news! ".mysql_error();
}else{
echo "succes";
}
}else if($action == "delete"){
$sql = "";
}
?>
有人看到这里出了什么问题吗？或者有人有其他选择吗？
我希望有人能帮我解决这个问题。
这样更改：
include("../assets/libs/SQLLib.php");
DB_Connect("test");
print_r($_POST); //Dont echo, what is already echoed
var_dump($_POST); //Dont echo, what is already echoed
$message = !empty($_POST['message'])?$_POST['message']:'';
$action = !empty($_POST['action'])?$_POST['action']:'';
$thumbnail = !empty($_POST['thumbnail'])?$_POST['thumbnail']:'';
$data = !empty($_POST['data'])?$_POST['data']:'';
if(!empty($thumbnail) && !empty($data)){
$serverFile = time().$thumbnail;
$fp = fopen('../assets/images/thumbnails/'.$serverFile, 'w');
fwrite($fp, $data);
fclose($fp);
$returnData = array("serverFile" => $serverFile);
echo json_encode($returnData);
} else {
echo json_encode(array('error'=>'No data and thumbnail assigned'));
}
if($message != ""){
$canPost = true;
}else{
echo "The message can not be empty.";
}
if($action == "insert" && $canPost){
$sql = "insert into newsitems
(date, message, thumbnail)
values
(NOW(),'".$message."', '".$thumbnail."')";
$result = mysql_query($sql);
if(!$result){
echo "Uh-oh! Something went wrong while posting the news! ".mysql_error();
}else{
echo "success";
}
}else if($action == "delete"){
$sql = "";
}
同样，您只需要更改.htaccess或php中的错误报告级别，就可以防止显示警告消息。In.htaccess:
php_flag error_reporting E_ERROR
如果在.php文件中，则
<?php error_reporting(E_RROR); //This displays only Errors, no warning and notices.
希望您已经尝试过使用isset($_POST)或isset($_POST['message'])，如果您得到"注意：未定义的索引：消息"。
所以最后我选择了不进行完整的jQuery上传，转而进行其他操作。我现在纯粹通过PHP调用上传文件，而不是通过jQuery post事件，在它旁边进行一个小的JavaScript检查，看看表单是否可以提交。
代码：
HTML
<div class='error-msg'></div>
<form method='post' action='requestPages/newsitems.php' enctype='multipart/form-data'>
News message
<textarea id='newsitem-message' name='newsitem-message' onchange='checkFormSubmit()'/>
<input type='file' name='newsitem-thumbnail' id='newsitem-thumbnail' />
<input hidden type='text' value='insert' name='newsitem-action'/>
<input class='submit' id='newsitem-submit' type='submit' value='Post news' disabled/>
</form>
PHP
<?php
include("../assets/libs/SQLLib.php");
DB_Connect("test");
var_dump($_FILES);
var_dump($_POST);
$message = $_POST['newsitem-message'];
$action = $_POST['newsitem-action'];
$errors= array();
$hasFile = false;
if($action == "insert"){
echo ($_FILES['newsitem-thumbnail'][0] == UPLOAD_ERR_NO_FILE);
if(isset($_FILES['newsitem-thumbnail']) && $_FILES['newsitem-thumbnail']['error'] != UPLOAD_ERR_NO_FILE){
$file_name = $_FILES['newsitem-thumbnail']['name'];
$file_size =$_FILES['newsitem-thumbnail']['size'];
$file_tmp =$_FILES['newsitem-thumbnail']['tmp_name'];
$file_type=$_FILES['newsitem-thumbnail']['type'];
$file_ext=strtolower(end(explode('.',$_FILES['newsitem-thumbnail']['name'])));
$extensions= array("jpeg","jpg","png");
if(!in_array($file_ext,$extensions)){
$errors[]="extension not allowed, please choose a JPEG or PNG file.";
}
$hasFile = true;
}
if(empty($errors)){
$sql = "insert into newsitems
(date, message, thumbnail)
values
(NOW(),'".$message."', '".$file_name."')";
$result = mysql_query($sql);
if(!$result){
echo "Uh-oh! Something went wrong while posting the news! ".mysql_error();
}else{
if($hasFile){
if(!move_uploaded_file($file_tmp,"../assets/images/thumbnails/".$file_name)){
echo "Moving the file failed!";
}
}
}
}else{
print_r($errors);
}
}else if($action == "delete"){
$sql = "";
}
?>
JavaScript
function checkFormSubmit(){
if($.trim($('#newsitem-message').val()) != ""){
$('#newsitem-submit').prop('disabled', false);
}else{
$('#newsitem-submit').prop('disabled', true);
}
}