EDIT: I've updated my code due to feedback from here, and it's no longer giving me an empty array but now it's simply giving me null.
EDIT 2: Someone in my organization solved this for me. Turns out I was using POST options that I didn't need: My working code is:
Frontend:
$.ajax({
type: "POST",
url: "update_data_ajax.php",
data: {
events: JSON.stringify(currentEventsRows)
}
}).done(function(data) {
console.log("Done");
console.log(data);
});
Backend:
echo json_encode($_POST);
Original post:
I'm trying to make an AJAX POST request to post some data to a SQL table, but it doesn't seem like my POST request is actually sending anything because the PHP backend is simply giving me a null.
To try to narrow down the problem, I simplified my page down to a JavaScript frontend that posts an array of data and a PHP backend that simply returns the data. Here's the relevant part of my frontend webpage (update_data.php):
let currentEventsRows = [/* array of dicts of strings */];
$.ajax({
method: "POST",
url: "update_data_ajax.php",
contentType: "application/json; charset=utf-8",
dataType: "JSON",
data: JSON.stringify{
events: currentEventsRows
},
processData: false
}).done(function(data) {
console.log("Done");
console.log(data);
});
Here's my PHP backend (update_data_ajax.php):
<?php
$_POST = json_decode(file_get_contents("php://input"), true);
echo $_POST;
?>
And here's the console output:
Done
null
What am I doing wrong? I feel like I'm missing something totally simple.
You have 2 issues here, 1. You aren't sending the JSON properly. 2. You're not reading the JSON properly.
You have to encode your JSON to send in your ajax call
let currentEventsRows = [/* array of dicts of strings */];
$.ajax({
method: "POST",
url: "update_data_ajax.php",
contentType: "application/json; charset=utf-8",
dataType: "JSON",
data: JSON.stringify({
events: currentEventsRows
})
// processData: false -- not needed since the JSON is a string
}).done(function(data) {
console.log("Done");
console.log(data);
});
Your JSON data is not populated in the $_post superglobal(this only happens for multipart/form-data and application/x-www-form-urlencoded), so you have to read it from php://input
<?php
echo file_get_contents('php://input');
?>
Someone from my organization actually solved this for me. Turns out I was using POST options that I didn't need.
Frontend:
$.ajax({
type: "POST",
url: "update_data_ajax.php",
data: {
events: JSON.stringify(currentEventsRows)
}
}).done(function(data) {
console.log("Done");
console.log(data);
});
Backend:
echo json_encode($_POST);
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