I am doing an HTTP Post request in Javascript in order to update a JSON file.
function updateJson(dataNew){
var stringData = JSON.stringify(dataNew);
$.ajax({
type: 'POST',
contentType: 'application/json; charset=utf-8',
url: 'update.php',
data: {stringData},
success : function(d){
alert('done');}
})
}
Then in PHP:
<?php
$a = json_encode(file_get_contents("php://input"));
file_put_contents('newData.json', $a);
?>
I want JSON data in the JSON file however, the json file only includes a single string which is similar to the request payload of the http post. What am I doing wrong?
I would suggest to pass a key/value pair in the data object, and leave the contentType attribute as default (remove it), like:
$.ajax({
...
data: {myjson: stringData},
...
);
Then in PHP you should read the posted data and get that myjson element, without encoding it again, as it is already JSON:
<?php
$a = $_POST['myjson'];
file_put_contents('newData.json', $a);
?>
Related
I already looked up questions about this topic but couldn't figure my problem out.
I have a php file which contains the array:
$data = ['logged' => $_SESSION['loggedin'], 'sessName' => $_SESSION['name']];
echo json_encode($data);
Here's my AJAX code, but I have no idea what should I put in "data". Basically my goal is to use the $data array in my Javascript code. (So i can manipulate DOM with conditions).
<script>
$.ajax({
type: 'POST',
dataType: "json",
url:'sign-in.php',
data:
success: function(data)
{
try {
data = JSON.parse(data);
}catch(e) {}
console.log(data);
}
});
</script>
By specifying dataType: "json" in your $.ajax call, jQuery will automatically parse your JSON data into javascript object / array for you. You can probably remove the JSON.parse form you code.
Also there is an extra data: line, which would be a javascript syntax error.
<script>
$.ajax({
type: 'POST',
dataType: "json",
url:'sign-in.php',
success: function (data) {
console.log(data);
},
});
</script>
One more thing. Your PHP code, expects both 'loggedin' and 'name' to be set in your $_SESSION. If not, your PHP (depends on settings) might generate warning message in between and cause JSON parsing error.
You can use the null coalescing operator (introduced since PHP 7.0) to assign some value if either or both values are not set:
$data = [
'logged' => $_SESSION['loggedin'] ?? FALSE,
'sessName' => $_SESSION['name'] ?? '',
];
echo json_encode($data);
Updated: Add proper handling to potential invalid key issue.
In your example you haven't intiliaze the session with session_start(), also it recomanded to indicate the response content type, and i fix also your ajax request :
PHP :
session_start();
$data = [
'logged' => $_SESSION['loggedin'],
'sessName' => $_SESSION['name'],
];
header("Content-type: application/json");
echo json_encode($data);
exit();
Jquery :
$.ajax({
type: 'GET',
dataType: "json",
url:'sign-in.php',
success: function(data)
{
try {
data = JSON.parse(data);
} catch(e) {}
console.log(e);
}
}
});
I have an Ajax request to save data from JavaScript and write it to a file using a separate ("saveData.php") PHP file. I want to know if I can "POST" multiple JavaScript variables / strings within the same Ajax request.
For instance, I currently have this:
function saveData(){ //sends an AJAX request to saveData.php
$.ajax({
type: "POST",
url: "saveData.php",
dataType: "text/plain",
ContentType: "charset=utf-8",
data: {"data": dataString},
})
}
And this works great via my PHP file, which as this code:
$data = $_POST["data"];
$theFile = fopen("Data/" . FileNameHere . ".txt", "a+");
// Save data into a file based on their username
fwrite($theFile, $data);
fclose($theFile);
But I want to save the file based on their userID, which is a JavaScript variable.
Can I do something like this:
function saveData(){ //sends an AJAX request to saveData.php
$.ajax({
type: "POST",
url: "saveData.php",
dataType: "text/plain",
ContentType: "charset=utf-8",
data: {"data": dataString},
data1: {"data1": userID}, <-----new line with JS variable 'userID'
})
}
And PHP file like this:
// Prepare line of data to save.
$data = $_POST["data"];
$userID = $_POST["data1"]; <--------New code to POST "data1" from Ajax
$theFile = fopen("Data/" . $userID . ".txt", "a+");
// Save data into a file based on their username
fwrite($theFile, $data);
fclose($theFile);
Yes, you can, you are passing a JSON Object so it can have as many properties as you like.
Read More about, how to send multiple data in server side via ajax.
Try this
function saveData(){ //sends an AJAX request to saveData.php
$.ajax({
type: "POST",
url: "saveData.php",
dataType: "text/plain",
ContentType: "charset=utf-8",
data: {
"data": dataString,
"data2":val2,
"data3":val3,
"data4":val4
},
})
}
And PHP file like this:
$data = $_POST["data"];
$userID = $_POST["data2"];
$theFile = fopen("Data/" . $userID . ".txt", "a+");
// Save data into a file based on their username
fwrite($theFile, $data);
fclose($theFile);
So I'm trying to send a JSON as a string.
Then I have a PHP back-end that retrieves this JSON string and parses it using json_decode.
Unfortunately, I can't get to send this JSON as a string.
Here's the jQuery Ajax script I used:
var jsonString = JSON.stringify(checkables);
console.log(jsonString);
$.ajax({
url: $url,
type: 'POST',
data: {ajaxidate: JSON.stringify(jsonString)},
contentType: "application/json; charset=UTF-8",
success: function (data)
{
// just successful callback
},
error: function ()
{
// just error callback
}
});
Variable checkables contains raw form as JSON data:
After applying JSON.stringify(), this is now how it looks:
[{"name":"name","type":"multialphanumslug","value":"AD"},{"name":"server","type":"host","value":"10.1.1.1"},{"name":"port","type":"number","value":"8080"},{"name":"authid","type":"username","value":"barryallen"}]
At the back-end, I have this PHP script:
<?php
var_dump($_POST);
die();
?>
Now I suppose $_POST at back-end should now contain this:
array(
'ajaxidate' => "[{\"name\":\"name\",\"type\":\"multialphanumslug\",\"value\":\"AD\"},{\"name\":\"server\",\"type\":\"host\",\"value\":\"10.1.1.1\"},{\"name\":\"port\",\"type\":\"number\",\"value\":\"8080\"},{\"name\":\"authid\",\"type\":\"username\",\"value\":\"barryallen\"}]"
);
But it didn't receive anything. Here's the captured request:
The response from back-end?
I tried with POSTMan and I received an expected correct output:
Now that was ridiculous.
I'm stuck at this for 2 days trying to figure out what's going on or what did I miss. Any help will be greatly appreciated.
You need to parse the data on the server:
$myArray = json_decode($_POST['ajaxidate']);
var_dump($myArray);
Consider this:
<?php
$a = '[{"a": 1}]';
$b = json_decode($a);
var_dump($a);
var_dump($b);
?>
Output:
string(10) "[{"a": 1}]"
array(1) {
[0]=>
object(stdClass)#1 (1) {
["a"]=>
int(1)
}
}
dataType: 'json', tldr: Use It!
When setting dataType = json you tell jQuery that the response from the server should be interpreted as JSON and it will therefore parse it for you and give the parsed object / array as first argument to the success callback:
$.ajax({
// ...
dataType: 'json',
success: function(myJson) {
console.log(myJson); // this will be a JSON object/array...
}
});
As you mention dataType: json in your ajax call data need to be in json formate but using JSON.stringify convert Json object to json String that with make problem for you need to change
`var jsonString = JSON.stringify(checkables);`
to
var jsonString = checkables;
JSON.stringify()
Solved my own problem. Having #Munna suggested to use $.post() made me figure out to eliminate the unnecessary. From that case, the unnecessary is contentType option from $.ajax().
This is the updated working solution:
$.ajax({
url: $url,
type: 'POST',
data: {ajaxidate: JSON.stringify(jsonString)},
success: function (data)
{
// just successful callback
},
error: function ()
{
// just error callback
}
});
Thanks everyone who helped. Have a good day
I have a WAMP server with PHP 5.4.3 version. I encoded the data in JSON by php file below is the code (submit.php).
$username = 'User';
$comment = 'Test comment';
$date = date("Y-m-d G:i:s");
$image = '/img/sephiroth.png';
$return = array(
'username'=> $username,
'comment' => $comment,
'date' => $date,
'image' => $image );
echo json_encode($return);
Now i have a javascript file(script.js).
$.ajax({
type: "POST",
url: "submit.php",
data: dataString,
cache: false,
success: function(result){
alert(result); //It is showing all the JSON data.
$value = result;
$data = json_decode($value,true);
alert($data);
}
});
I want to decode all the JSON data separately. e.g Username, comment, date, image. So, i can show them on webpage, at the moment all data is coming together. I tried multiple times with multiple options (php array or result.username or result['username'] but no luck.
Now i am getting below error.
ReferenceError: json_decode is not defined
$data = json_decode($value,true);
you cannot use json_decode in JS json_decode is PHP function
use jQuery.parseJSON(json_data) to parse your json data;
jQuery.parseJSON( result );
Change
$value = result;
$data = json_decode($value,true);
To :
jQuery.parseJSON( result );
http://api.jquery.com/jQuery.parseJSON/
Try the following:
success: function(result){
var res = $.parseJSON(result);
var data = [res.username, res.comment, res.date, res.image]; // Array of the received response
}
This way you can get required output
try like below:
$.ajax({
type: "POST",
url: "submit.php",
data: dataString,
cache: false,
success: function(result){
alert(result); //It is showing all the JSON data.
jQuery.parseJSON( result );
}
});
Use the dataType option of ajax and set its value to json.
Then you can access the response as result['username']
My example:
Server-side returns {"username":"xxxxx","data":"xxxxxxxxxxxx and more"}
You can just deal with json like a javascript array, do not need to decode it.
the data below itself is the array of result.
$.ajax({
type: "POST",
url: "submit.php",
cache: false,
success: function(data){
var username = data['username'];
var data = data['data'];
//and so on
}
});
And make sure php sent the header Content-Type:application/json
header('Content-Type: application/json');
JavaScript code:
var data = {"hiSO": "my very complex - nested objects/arrays - data object"};
var j = jQuery.noConflict();
j.ajax({
type: "POST",
url: "postTestingResult.php",
contentType: "application/json; charset=utf-8",
data: {"data": JSON.stringify(data)},
dataType: "json",
success: ajaxSuccess,
error: ajaxError
});
PHP Code:
header('Content-Type: application/json');
if(!empty($_POST['data'])) {
$data = json_decode($_POST['data']);
//do things with data
echo json_encode(array("success" => "thanks for the info!"));
} else {
echo json_encode(array("error" => "'data' is not set or is NULL"));
}
No matter how I structure the data, $_POST['data'] always seems to be empty (specifically, Undefined). If you want a full copy of the data object I am using, check out this JSFiddle. Appreciate the help, thank you!
You've told the server you're sending JSON (via contentType: "application/json; charset=utf-8"), but you're not sending JSON, you're sending URI-encoded data. This is because you've given jQuery an object for the data option (an object with one property, whose value is a JSON string).
Your PHP code expects URI-encoded data, so to fix it just remove the contentType option so jQuery uses its default.
If you really want to send JSON instead (which would require changing your PHP), change
data: {"data": JSON.stringify(data)},
to
data: JSON.stringify(data),
or
data: JSON.stringify({data: data}),