Sending data from JavaScript to PHP via XMLHttpRequest
Question
Good day.
I'm trying to send a simple piece of data from one php file (manage.php) to another (view.php).
I cannot send the data via a form, I want to send it via a JS script. Here's my attempt:
var read = function(id) { xmlhttp = new XMLHttpRequest(); xmlhttp.open("POST", "view.php", true); xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xmlhttp.send("id=" + id); }
In view.php, using $_POST["id"] causes an error stating that the index "id" is undefined.
What's the correct way to send the data? Thank you.
2 answers
solution1
4 2017-05-17 12:42:51
Your input is not complete. So I did the full example below that you can follow. I made a function, named readid(id), doing the same thing as you want. Then I call that function from html, when needed.
<!doctype html>
<html lang="fr">
<head>
<meta charset="iso-8859-1">
<title>Untitled Document</title>
<script type="text/javascript" charset="iso-8859-1">
function readid(id){
"use strict";
console.log("id=", id)
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST", "/cgi-bin/view.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.onreadystatechange = function() {
if (this.readyState === 4 || this.status === 200){
console.log(this.responseText); // echo from php
}
};
xmlhttp.send("id=" + id);
}
</script>
</head>
<body>
<p>This is a test</p>
<input type="button" name="Submit" value="Submit" id="formsubmit" onClick="readid(id)">
</body>
</html>
view.php
<?php
$logFile = "view.log";
$id = $_POST['id'];
file_put_contents($logFile, $id);
echo $id;
?>
solution2
-1 2017-03-29 16:18:43
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<body>
<form id="formoid" title="" method="post">
<div>
<label class="title">First Name</label>
<input type="text" id="name" name="name" >
</div>
<div>
<label class="title">Name</label>
<input type="text" id="name2" name="name2" >
</div>
<div>
<input type="submit" id="submitButton" name="submitButton" value="Submit">
</div>
</form>
<script type='text/javascript'>
/* attach a submit handler to the form */
$("#formoid").submit(function(event) {
/* stop form from submitting normally */
event.preventDefault();
$.ajax({
type: 'POST',
data: id,
url: 'PATH_TO_VIEW.PHP',
success: function(data) {
//do something
},
error: function(data){
console.log('Something went wrong.');
}
});
});
</script>
</body>
</html>
Now the data in ajax can be collected numerous eg serialized and new FormData(form) to quickly name two.
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