嗨我想通过AJAX使用Javascript和PHP上传一个BLOB图像到我的本地主机wampserver上。
我想获得$_FILES
中的图像,但由于某种原因$_FILES
为空。我已经设置了enctype
并且为file_uploads = On
检查了php.ini
。
这里是我的HTML表单:
<h1>CREATE A NEW ENTRY</h1>
<form name="insertForm" method="post" enctype="multipart/form-data">
Name: <input type="text" id="insert_name" /> <br />
Age: <input type="text" id="insert_age" /> <br />
WPM: <input type="text" id="insert_wpm" /> <br />
Sex: <select id="insert_sex">
<option>M</option>
<option>F</option>
</select><br />
Photo : <input type="file" name="photo" id="insert_photo" /> <br />
<input type="button" onClick="insertFunction()" value="UPDATE LIST" />
</form>
<br>
<br>
<div id="preview"><img id="preview_img" src="images/placeholder.png"/></div>
<div id="message"></div>
这里是运行AJAX的JavaScript:
function insertFunction()
{
var ajaxRequest = createAjaxObject(); // checks for browser type and returns corres. ajax object
var name = document.getElementById('insert_name').value;
var age = document.getElementById('insert_age').value;
var wpm = document.getElementById('insert_wpm').value;
var sex = document.getElementById('insert_sex').value;
var image = document.getElementById('insert_photo').files[0];
var imageType = image.type;
alert(imageType);
var match = ["image/jpeg", "image/png", "image/jpg"]
if (!((imageType==match[0]) || (imageType==match[1]) || (imageType==match[2])))
{
document.getElementById('preview').innerHTML = '';
document.getElementById('preview').innerHTML = '<img id="preview_img" src="images/noimage.png"/ alt="../images/noimage.png">';
document.getElementById("message").innerHTML = "<p class='error'>Please Select A valid Image File</p>"+"<h4>Note</h4>"+"<span id='error_message'>Only jpeg, jpg and png Images type allowed</span>";
}
else
{
var reader = new FileReader();
reader.onload = function(e) {
document.getElementById('preview').innerHTML = '';
document.getElementById('preview').innerHTML = '<img id="preview_img" src="' + e.target.result + '" alt="' + e.target.result + '">';
};
reader.readAsDataURL(image);
var dataString = "name=" + name + "&age=" + age + "&wpm=" + wpm + "&sex=" + sex + "&photo=" + image;
ajaxRequest.open("POST", "insert-example.php", true);
ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
ajaxRequest.send(dataString);
document.getElementById('insertDiv').innerHTML = "processing...";
ajaxRequest.onreadystatechange = function() {
if (ajaxRequest.readyState == 4)
{
var insertDiv = document.getElementById('insertDiv');
insertDiv.innerHTML = ajaxRequest.responseText;
}
}
}
}
这里是更新本地主机的PHP。
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
$dbhost = "localhost";
$dbuser = "root";
$dbpassword = "";
$dbname = "ajaxtutorial";
$link = mysqli_connect($dbhost, $dbuser, $dbpassword, $dbname);
if (mysqli_connect_errno())
{
echo "Connection failed: %s" . mysqli_connect_error();
}
mysqli_connect($dbhost, $dbuser, $dbpassword) or die(mysql_error());
mysqli_select_db($link, $dbname) or die("Cannot connect to database");
$name = mysqli_real_escape_string($link, $_POST['name']);
$age = mysqli_real_escape_string($link, $_POST['age']);
$wpm = mysqli_real_escape_string($link, $_POST['wpm']);
$sex = mysqli_real_escape_string($link, $_POST['sex']);
// Image file code below
if (false)
{
$photo = $_FILES["photo"];
echo $photo;
}
else
{
echo var_dump($_FILES);
}
}
?>
我从var_dump
得到的输出是:
阵列(大小= 0)
空
可能有人请告诉我什么是我的代码的问题呢?
那么,你有任何错误?如果是这样,请将它们包含在您的问题中。 – Epodax
@Epodax没有错误 –
尝试'ini_set(“display_errors”,1); error_reporting(E_ALL);'检查错误 –