Ajax POST format with PHP

Ajax POST format with PHP - javascript

I have a form, inside which I want to have a "virtual form", which handles file attachments. I have a File-input and a button to send the file.
The problem is that my PHP backed gets only POST and that with structure:
"file"; filename="xxx.jpg"
Content-type: image/jpeg
.
.
.
where the dots represent the binary data from the file.
From what I have read it should be $_FILES and $_POST variables but I don't get them.
Here are the relevant codelines in HTML and in Javascript:
<input type="file" id="file-to-append" name="file-attachment">
<input type="button" onClick="append_file()" value="Add file">
function append_file() {
var formData = new FormData();
console.log(jQuery('#file-to-append'));
formData.append('file', jQuery(":file")[0].files[0]);
jQuery.ajax({
url : 'file_upload.php',
type : 'POST',
data : formData,
processData: false,
success : function(data) {
console.log(data);
alert("Added");
}
});
}
Could somebody spot or know where the problem lies?

The data is passing properly so there is no problem with your Ajax call.
You get the file object in PHP using the super global $_FILES.
In your case, you would use it like:
$file = $_FILES['file'];
echo $file['name'];
echo $file['tmp_name'];
.
.
.
To take a look at the $_FILES array you could:
echo "<pre>";
print_r($_FILES);
echo "</pre>";

Things are getting stranger and stranger. I got it working, but only on IE 11 by setting contentType: 'multipart/form-data' With Chrome it doesn't work at all with that setting.
I have tried with contentType: false, but it doesn't work on either platform though it should be the right thing(TM) to do :/.
I have also added enctype-setting in the outer form, but I wonder how it could help, because I am not submitting (whole form) but only adding things "inside" the main form (that I handle myself). Apparently it didn't help either.
This shouldn't be a problem but for some reason I am stuck with this ajax implementation, though I have used file upload since long time ago (two figure number)...
hank

Use right encrypte in your form
<form id="data" enctype="multipart/form-data" method="post" >
<input type="submit" value="Add file">
</form>
use ajax submit
$("form#data").submit(function()
{var formData = new FormData($(this)[0]);
$.ajax({
url: "filename.php",
type: 'POST',
data: formData,
async: false,
success: function (data)
{
var jsonData = $.parseJSON(data);
var errFlag =jsonData.errorFlag;
var errMsg =jsonData.errorMessage;
if(errFlag == 1)
{
//successmessage;
}
else
{
//errormessage;
}
},
cache: false,
contentType: false,
processData: false
});
return false;
});

Related

Accessing type="file" input from POST method on server side

Having some difficulty understanding how to access type="file" input on the server side. Below is the code I'm using. I use AJAX because I want my web app to not require refreshing, and am using a slightly roundabout way of submitting my form so I can have a better UI.
My HTML:
<form id="updateProfileImageForm" enctype="multipart/form-data">
<div class="updateProfileImageContainer">
<img src="images/profile/generic.png" class="updateProfileImage">
<div class="updateProfileImageOverlay" onclick="changeImageToUpload()">
<div class="updateProfileImageOverlayText">Upload new image</div>
</div>
<input type="file" id="imageToUpload" name="image" style="display: none;" onChange="$(this).closest('form').trigger('submit');"></input>
</div>
</form>
My JS:
function changeImageToUpload() {
$('#imageToUpload').trigger('click');
}
$('#updateProfileImageForm').submit(function(e) {
e.preventDefault();
var form_data = new FormData(this);
$.ajax({
type: 'POST',
url: '/changeProfile',
data: form_data,
processData: false,
success: function(response) {
if(response.message != null) {
alert(response.message);
} else {
// Change profile image displayed
$('.updateProfileImage').attr("src", response.newProfileImage);
alert('Profile picture successfully updated! Refresh your browser to update your window!');
}
}
})
});
My Server PHP:
if (isset($_FILES['image'])) {
$image = $_FILES['image'];
}
Var_dump on $_FILES shows an empty array, while var_dump on $_POST shows a lot of information (which I'm assuming is my data file). However, accessing the 'image' property on either $_POST or $_FILES (through either $_POST['image'] or $_FILES['image']) gives me either "undefined index" or "undefined variable".
Would you guys be so kind as to educate me on:
What's the difference between $_POST and $_FILES?
How should I be accessing the file in this case?
Thanks!

You're missing a necessary config option in your ajax request, you need to set contentType to false
$.ajax({
type: 'POST',
url: '/changeProfile',
data: form_data,
processData: false,
contentType: false,
success: function(response) {
if(response.message != null) {
alert(response.message);
} else {
// Change profile image displayed
$('.updateProfileImage').attr("src", response.newProfileImage);
alert('Profile picture successfully updated! Refresh your browser to update your window!');
}
}
})
jQuery.ajax sets the content type by default to application/x-www-form-urlencoded which is incorrect for your FormData object, if you set it to false it will be set correctly by the underlying XMLHTTTPRequest object.

Idea behind it.
Instead of using file as post to PHP, simply convert image to base64 and receive that string using ajax in php.
Refer to this URL

$_POST is not working in ajax form submit?

When I try to check user input name is already exist by ajax form submit !But it only get Undefined index: username in sessions.php ,what is missing ?
<form action="" method="POST" id="saveuser" enctype="multipart/form-data">
<input type="text" name="username"><br>
<input type="password" name="pass"><br>
<input type="file" name="fileupload"><br>
<input type="submit" name="submit" value="Confirm" id="confirm">
</form>
<script type="text/javascript">
$('#confirm').click(function(e){
e.preventDefault();
$.ajax({
type:'POST',
url :"sessions.php",
data:$("#saveuser").serialize(),
contentType : false,
processData: false,
success: function(d){
console.log(d);//[error] :Undefined index: username
}
});
});
</script>
sessions.php
<?php
$exist = "david";
if($_POST['username'] == $exist){
echo json_encode("Already exist");
}
else{
echo json_encode("You can succesfully add");
}
?>

If you set contentType to false, ajax header is not send, in result if you send somehing type:POST header doesn't contain your data, so server can't see it. If you use GET to do it, it will work, because data is sended with GET (after url) not in header.
Just remove contentType
$.ajax({
type:'POST',
url :"sessions.php",
data: $("#saveuser").serialize(),
success: function(d){
console.log(d);
}
});
contentType
(default: 'application/x-www-form-urlencoded;
charset=UTF-8')
Type: Boolean or String When sending data to the
server, use this content type. Default is
"application/x-www-form-urlencoded; charset=UTF-8", which is fine for
most cases. If you explicitly pass in a content-type to $.ajax(), then
it is always sent to the server (even if no data is sent). As of
jQuery 1.6 you can pass false to tell jQuery to not set any content
type header. Note: The W3C XMLHttpRequest specification dictates that
the charset is always UTF-8; specifying another charset will not force
the browser to change the encoding. Note: For cross-domain requests,
setting the content type to anything other than
application/x-www-form-urlencoded, multipart/form-data, or text/plain
will trigger the browser to send a preflight OPTIONS request to the
server.
processData is used to send data as it is - Ajax documentation
Sending Data to the Server
By default, Ajax requests are sent using the GET HTTP method. If the
POST method is required, the method can be specified by setting a
value for the type option. This option affects how the contents of the
data option are sent to the server. POST data will always be
transmitted to the server using UTF-8 charset, per the W3C
XMLHTTPRequest standard.
The data option can contain either a query string of the form
key1=value1&key2=value2, or an object of the form {key1: 'value1',
key2: 'value2'}. If the latter form is used, the data is converted
into a query string using jQuery.param() before it is sent. This
processing can be circumvented by setting processData to false. The
processing might be undesirable if you wish to send an XML object to
the server; in this case, change the contentType option from
application/x-www-form-urlencoded to a more appropriate MIME type.

There are few issues with your code, such as:
... it only get Undefined index: username in sessions.php
The problem is because of the following two lines,
contentType : false,
processData: false,
From the documentation,
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: Boolean or String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a content-type to $.ajax(), then it is always sent to the server (even if no data is sent). As of jQuery 1.6 you can pass false to tell jQuery to not set any content type header.
and
processData (default: true)
Type: Boolean
By default, data passed in to the data option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type "application/x-www-form-urlencoded". If you want to send a DOMDocument, or other non-processed data, set this option to false.
Hence, $_POST array would be empty in sessions.php page if you set contentType and processData to false, and that's why you're getting this undefined index: username error. But having said that, since you're sending a file with your AJAX request, it's okay to set these settings as false, which is further explained in the following point.
.serialize() method creates a URL encoded text string by serializing form control values, such as <input>, <textarea> and <select>. However, it doesn't include file input field while serializing the form, and hence your remote AJAX handler won't receive the file at all. So if you're uploading file through AJAX, use FormData object. But keep in mind that old browsers don't support FormData object. FormData support starts from the following desktop browsers versions: IE 10+, Firefox 4.0+, Chrome 7+, Safari 5+, Opera 12+.
Since you're expecting a json object from server, add this setting dataType:'json' to your AJAX request. dataType is the type of data you're expecting back from the server.
So the solution would be like this:
Keep your HTML form as it is, and change your jQuery/AJAX script in the following way,
$('#confirm').click(function(e){
e.preventDefault();
var formData = new FormData($('form')[0]);
$.ajax({
type: 'POST',
url : 'sessions.php',
data: formData,
dataType: 'json',
contentType: false,
processData: false,
success: function(d){
console.log(d.message);
}
});
});
And on sessions.php page, process your form like this:
<?php
$exist = "david";
if(isset($_POST['username']) && !empty($_POST['username']) && isset($_POST['pass']) && !empty($_POST['pass'])){
if($_POST['username'] == $exist){
echo json_encode(array("message" => "Already exist"));
}else{
echo json_encode(array("message" => "You can succesfully add"));
// get username and password
$username = $_POST['username'];
$password = $_POST['pass'];
// process file input
// Check whether user has uploaded any file or not
if(is_uploaded_file($_FILES['fileupload']['tmp_name'])){
// user has uploaded a file
}else{
// no file has been uploaded
}
}
}else{
echo json_encode(array("message" => "Invalid form inputs"));
}
?>

You are setting contentType to false, that is why PHP can not parse your post body

Use $.post() for ajax :
$('#confirm').click(function(e){
e.preventDefault();
$.post("sessions.php", $.param($("#saveuser").serializeArray()), function(data) { // use this ajax code
console.log(data);
});
});

Use the following code in your html code and remove contentType : false,
processData: false
<form action="" method="POST" id="saveuser" enctype="multipart/form-data">
<input type="text" name="username"><br>
<input type="password" name="pass"><br>
<input type="file" name="fileupload"><br>
<input type="submit" name="submit" value="Confirm" id="confirm">
</form>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-rc1/jquery.min.js"></script>
<script type="text/javascript">
$('#confirm').click(function(e){
e.preventDefault();
$.ajax({
type:'POST',
url :"sessions.php",
data: $('#saveuser').serialize(),
success: function(d){
console.log(d);//[error] :Undefined index: username
}
});
});
</script>

Considering this is your HTML form
<form method="POST" id="saveuser" enctype="multipart/form-data">
<input type="text" name="username" id="username"><br>
<input type="password" name="pass" id="pass"><br>
<input type="file" name="fileupload"><br>
<input type="submit" name="submit" value="Confirm" id="confirm">
</form>
You can call the jQuery function like this
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-rc1/jquery.min.js"></script>
jQuery("#saveuser").submit(function () {
//Validate the input here
jQuery.ajax({
type: 'POST',
url: 'sessions.php',
data: jQuery('#saveuser').serialize(),
success: function (msg) {
msg = jQuery.trim(msg);
if (msg == 'Success') {
//Do Whatever
//jQuery("#thanks_message").show('slow');
}
}
});
return false;
});
You will get all the params in your session.php file like
<?php
$username = trim($_POST['username']);
$pass = trim($_POST['pass']);
//rest of the params of the form
$exist = "david";
if ($username == $exist) {
echo json_encode("Already exist");
} else {
echo json_encode("You can succesfully add");
}
?>
I hope this resolves your problem.

<form method="POST" id="saveuser" enctype="multipart/form-data">
<input type="text" name="username"/><br>
<input type="password" name="pass"/><br>
<input type="file" name="fileupload"/><br>
<input type="button" name="save" id="save" value="save"/>
</form>
<script type="text/javascript">
$('#save').click(function(e){
var form = new FormData(document.getElementById('#saveuser'));
$.ajax({
url :"sessions.php",
type : 'POST',
dataType : 'text',
data : form,
processData : false,
contentType : false,
success: function(d){
console.log(d);//[error] :Undefined index: username
}
});
});
</script>

You need to change your script:
Try using new FormData instead of .serialize().
<script type="text/javascript">
$('#confirm').click(function(e){
e.preventDefault();
var formData = new FormData($("#saveuser")[0]);
$.ajax({
type:'POST',
url :"tt.php",
data:formData,
contentType : false,
processData: false,
success: function(d){
console.log(d);//[error] :Undefined index: username
}
});
});
</script>
Note : You are used contentType to false that mean jQuery not to add a Content-Type header. You are using jQuery's .serialize() method which creates a text string in standard URL-encoded notation. You need to pass un-encoded data when using "contentType: false".

Change your script to
<script type="text/javascript">
$(function(){
$('#confirm').click(function(e){
e.preventDefault();
$.ajax({
type:'POST',
url :"sessions.php",
data:$("#saveuser").serialize(),
contentType : false,
processData: false,
success: function(d){
console.log(d);//[error] :Undefined index: username
}
});
});
});
</script>

Your coding is correct.Remove processData and contentType from Ajax it will work
processData : false,
contentType : false,

Remove that method,action: post and blank from your form tag as you need to give all details in ajax method only.
or you can delete the form tag itself as ajax method will take care of the post call.
this will solve hopefully
<form id="saveuser" enctype="multipart/form-data">

Isset does not work with ajax call

I am making a simple page where user can upload a image without refreshing the whole page. But if(isset($_post[oneimgtxt])) is not working..
here is my serverSide Code that upload image :
<?php
$maxmum_size = 3145728; //3mb
$image_type_allowed = array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_BMP);
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if(isset($_POST["oneimgtxt"])){//<!------------------ this line is not working
if((!empty($_FILES[$_FILES['upimage']['tmp_name']])) && ($_FILES["upimage"]['error'] == 0)){
$file=$_FILES['upimage']['tmp_name'];
$image_count = count($_FILES['upimage']['tmp_name']);
if($image_count == 1){
$image_name = $_FILES["upimage"]["name"];
$image_type = $_FILES["upimage"]["type"];
$image_size = $_FILES["upimage"]["size"];
$image_error = $_FILES["upimage"]["error"];
if(file_exists($file)){//if file is uploaded on server in tmp folder (xampp) depends !!
$filetype =exif_imagetype($file); // 1st method to check if it is image, this read first binary data of image..
if (in_array($filetype, $image_type_allowed)) {
// second method to check valid image
if(verifyImage($filename)){// verifyImage is function created in fucrenzione file.. using getimagesize
if($ImageSizes < $maxmum_size){//3mb
$usr_dir = "folder/". $image_name;
move_uploaded_file($file, $usr_dir);
}else{
$error_container["1006"]=true;
}
}else{
$error_container["1005"]=true;
}
}else{
$error_container["1004"]=true;
}
}else{
$error_container["1003"]=true;
}
}else{
$error_container["1002"]=true;
}
}else{
$error_container["1007"]=true;
}
}else{//this else of image issset isset($_POST["oneimgtxt"])
$error_container["1001"]=true;//"Error during uploading image";
}
echo json_encode($error_container);
}
?>
in chrome inspect element i got this..
image
and this is my js code with ajax...
$(".sndbtn").click( function(e){
var form = $("#f12le")[0];
var formdata = new FormData(form)
$.ajax({
type:'POST',
//method:'post',
url: "pstrum/onphotx.php",
cache:false,
data: {oneimgtxt : formdata},
processData: false,
contentType: false,
success:function (e){console.log(e);}
});
});
Here is html code:
<form method="post" id="f12le" enctype="multipart/form-data">
<input type="file" name="upimage"/>
<label for="imgr">Choose an Image..</label>
<textarea placeholder="Write something about photo"></textarea>
<input type="button" name="addimagedata" value="Post" class="sndbtn"/>
</form>
Thanks for any help.

You should send your FormData as a whole data object not a part of another data object. So, it should be like this -
$(".sndbtn").click( function(e){
var form = $("#f12le")[0];
var formdata = new FormData(form)
$.ajax({
type:'POST',
//method:'post',
url: "pstrum/onphotx.php",
cache:false,
data: formdata,
processData: false,
contentType: false,
success:function (e){console.log(e);}
});
});
Now, you should be able to access the form as it is. For example if you have any input with name inputxt inside the form, you should be able to access it with $_POST['inputxt']. And if you have any input type="file" with the name upimage, you need to access through $_FILES['upimage']. So, if you want to do isset() for that. You can do like this :
if(isset($_FILES['upimage'])){

add enctype on form any time using file inputs
<form enctype="multipart/form-data" >
<input type=file />
...
</form>
and make sure it's always a POST request.
Good luck...!

I had headaches for this thing! you should use $_FILES['name_of_dom_element']; in your php code.

PHP upload file to Ajax using onchange

function chkFile(file1) {
var file = file1.files[0];
var formData = new FormData();
formData.append('formData', file);
$.ajax({
type: "POST",
url: "chkFileType.php",
contentType: false,
processData: false,
data: formData,
success: function (data) {
alert(data);
}
});
}
<form action="" method="post" name="myForm" id="myForm" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="30000" />
Upload Files
<input type="file" name="uploadFile" id="uploadFile" onChange="chkFile(this)"/>
<input type="submit" name="submitbutt" value="Checkout">
chkFileType.php
<?php
print_r($_FILE)
?>
I want to create a form that when the user uploads a file, it will do a check on the uploaded file before submitting the whole form. I use onChange when a file is uploaded and then pass the formData value to Ajax to call my chkFileType.php to do the checks and alert back the response.
The function is running without any errors, but no response from alert(data);
I know I am doing something wrong, but have no idea which direction to go from. Am I doing the right way?

Everything looks fine. You have done in right way. But to get any response from an ajax call, you have to print the required stuff in chkFileType.php.
Like,
if($ext =="jpg" || $ext == "png"){
echo "Image"; // data in alert will alert as Image
} else if(check for txt file){
echo "Text File"; // data in alert will alert as Text File
} else if(chck for pdf) {
echo "Pdf";// data in alert will alert as Pdf
}
EDIT
change this
var formData = new FormData( $("#formID")[0] );
Hope you understand what i meant to say.

I think the problem is in that you have written "type" instead of "method", "POST" is a method not a type.

Problems getting json array in php using json_decode

Im trying to pass and return an array to and from a php script, I've tested the json_ecode portion and its working but I can't get the json_decode on the php side.
Javascript
scid_list = [];
$('.filter_on').each(function(){scid_list.push($(this).data("scid"));});
$.ajax({
type: "POST",
dataType: "json",
data: {scid_list:scid_list},
url: "/scripts/products_filter.php",
success: function(data){
alert(data.join('\n'));
}
});
PHP
<?php
$scid_list=(json_decode($_POST['scid_list'], true));
echo json_encode($scid_list);
exit();
?>
Ive also tried leaving out the true on decode
$scid_list=(json_decode($_POST['scid_list']);
and not decoding it at all
$scid_list=$_POST['scid_list'];
I'm not sure what I'm missing. I've tried playing around with serializing the data too but read I didn't have to if you specify the dataType as json, I tried using stripslashes
Any help is appreciated!
Cheers

I think the problem is that the data you're sending isn't json even though you're specifying it on the Ajax call. As it's only a 2-dimensional array you're getting, why don't you just use Array.join in your JS before doing the post:
var scids = scid_list.join(',');
That would turn it in to a comma separated string. e.g.
"id1,id2..."
You can simplify the Ajax call a bit too:
$.post('/scripts/products_filter.php', {scids: scids}, function(data) {
// process data response here
});
Then in your PHP file you can use explode() to turn it back in to an array:
$ids = explode(",",$_POST["scids"]);
foreach ($ids as $id) {
// Do something with the array of ids.
};
Hope that all makes sense.

Your dataType parameter specifies that you expect JSON data in response, but it does not mean you are sending data as JSON. In your case you are sending an array, therefor in PHP instead of:
$scid_list=(json_decode($_POST['scid_list'], true)); /* WRONG */
you should simply use:
$scid_list=$_POST['scid_list'];
dataType (default: Intelligent Guess (xml, json, script, or html))
Type: String The type of data that you're expecting back from the
server.
Alltogether, for given HTML:
<form action="work.php" method="post">
<p><input class="filter_on" data-scid="22" type="checkbox" /> Filter 22</p>
<p><input class="filter_on" data-scid="28" type="checkbox" /> Filter 28</p>
<p><input class="filter_on" data-scid="31" type="checkbox" /> Filter 31</p>
<p><input type="submit" value="Send" /></p>
</form>
and SCRIPT:
$(document).on('ready', function() {
$('form').on('submit', function(e) {
e.preventDefault();
scid_list = [];
$('.filter_on:checked').each(function(i){
scid_list.push( $(this).data("scid") );
});
$.ajax({
type: "POST",
dataType: "json",
data: {scid_list:scid_list},
url: "work.php",
success: function(data){
alert(data.join('\n'));
}
});
});
});
PHP part is:
$scid_list=$_POST['scid_list'];
echo json_encode($scid_list);
exit();

Develop Reference

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Ajax POST format with PHP - javascript

Related

Accessing type="file" input from POST method on server side

$_POST is not working in ajax form submit?

Isset does not work with ajax call

PHP upload file to Ajax using onchange

Problems getting json array in php using json_decode

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