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{"username":"Lorem", "password":"ipsum"}
<?php
if (
$_SERVER['REQUEST_METHOD'] === 'POST'
&& isset($_POST["username"])
&& isset($_POST["password"])
) {
$json = json_encode($_POST);
// Save JSON to file
file_put_contents("user.json", $json);
// Return some data back to the AJAX request.
echo $json;
// PS it's not wise to send passwords that way.
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="shortcut icon" href="#!" type="image/x-icon">
<title>AJAX PHP - SAVE USER DATA </title>
</head>
<body>
<h1>User: <span data-username>Unknown</span></h1>
<form id="form-login" action="./save.php" method="post">
<div class="form-group">
<label>
<span>Username</span>
<input placeholder="Username" autocomplete="off" type="text" name="username">
</label>
</div>
<div class="form-group">
<label>
<span>Password</span>
<input placeholder="Password" autocomplete="off" type="password" name="password">
</label>
</div>
<input id="button1" class="btn btn-success" type="submit" value="Login">
</form>
<script>
const EL_formLogin = document.querySelector("#form-login");
EL_formLogin.addEventListener("submit", (ev) => {
ev.preventDefault(); // Stop default form submit - we'll use AJAX
fetch(EL_formLogin.action, {
method: 'POST',
body: new FormData(EL_formLogin),
}).then(res => res.json()).then(data => {
// Hide the form
EL_formLogin.hidden = true;
// Show the user name
document.querySelector("[data-username]").textContent = data.username;
});
});
</script>
</body>
</html>
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