How can I send JSON data from Javascript in the browser, to a server and have PHP parse it there?
This question is related to
php
javascript
ajax
json
This is a summary of the main solutions with easy-to-reproduce code:
var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/json") // or "text/plain"
xhr.send(JSON.stringify(data));
PHP side, you can get the data with:
print_r(json_decode(file_get_contents('php://input'), true));
var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send("json=" + encodeURIComponent(JSON.stringify(data)));
Note: encodeURIComponent(...) is needed for example if the JSON contains & character.
PHP side, you can get the data with:
print_r(json_decode($_POST['json'], true));
var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(new URLSearchParams(data).toString());
PHP side, you can get the data with:
print_r($_POST);
using JSON.stringify(yourObj) or Object.toJSON(yourObj) last one is for using prototype.js, then send it using whatever you want, ajax or submit, and you use, as suggested, json_decode ( http://www.php.net/manual/en/function.json-decode.php ) to parse it in php. And then you can use it as an array.
<html>
<script type="text/javascript">
var myJSONObject = {"bindings": 11};
alert(myJSONObject);
var stringJson =JSON.stringify(myJSONObject);
alert(stringJson);
</script>
</html>
I recommend the jquery.post() method.
There are 3 relevant ways to send Data from client Side (HTML, Javascript, Vbscript ..etc) to Server Side (PHP, ASP, JSP ...etc)
1. HTML form Posting Request (GET or POST).
2. AJAX (This also comes under GET and POST)
3. Cookie
HTML form Posting Request (GET or POST)
This is most commonly used method, and we can send more Data through this method
AJAX
This is Asynchronous method and this has to work with secure way, here also we can send more Data.
Cookie
This is nice way to use small amount of insensitive data. this is the best way to work with bit of data.
In your case You can prefer HTML form post or AJAX. But before sending to server validate your json by yourself or use link like http://jsonlint.com/
If you have Json Object convert it into String using JSON.stringify(object), If you have JSON string send it as it is.
Javascript file using jQuery (cleaner but library overhead):
$.ajax({
type: 'POST',
url: 'process.php',
data: {json: JSON.stringify(json_data)},
dataType: 'json'
});
PHP file (process.php):
directions = json_decode($_POST['json']);
var_dump(directions);
Note that if you use callback functions in your javascript:
$.ajax({
type: 'POST',
url: 'process.php',
data: {json: JSON.stringify(json_data)},
dataType: 'json'
})
.done( function( data ) {
console.log('done');
console.log(data);
})
.fail( function( data ) {
console.log('fail');
console.log(data);
});
You must, in your PHP file, return a JSON object (in javascript formatting), in order to get a 'done/success' outcome in your Javascript code. At a minimum return/print:
print('{}');
See Ajax request return 200 OK but error event is fired instead of success
Although for anything a bit more serious you should be sending back a proper header explicitly with the appropriate response code.
Simple example on JavaScript for HTML input-fields (sending to server JSON, parsing JSON in PHP and sending back to client) using AJAX:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
</head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<body>
<div align="center">
<label for="LName">Last Name</label>
<input type="text" class="form-control" name="LName" id="LName" maxlength="15"
placeholder="Last name"/>
</div>
<br/>
<div align="center">
<label for="Age">Age</label>
<input type="text" class="form-control" name="Age" id="Age" maxlength="3"
placeholder="Age"/>
</div>
<br/>
<div align="center">
<button type="submit" name="submit_show" id="submit_show" value="show" onclick="actionSend()">Show
</button>
</div>
<div id="result">
</div>
<script>
var xmlhttp;
function actionSend() {
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
var values = $("input").map(function () {
return $(this).val();
}).get();
var myJsonString = JSON.stringify(values);
xmlhttp.onreadystatechange = respond;
xmlhttp.open("POST", "ajax-test.php", true);
xmlhttp.send(myJsonString);
}
function respond() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById('result').innerHTML = xmlhttp.responseText;
}
}
</script>
</body>
</html>
PHP file ajax-test.php :
<?php
$str_json = file_get_contents('php://input'); //($_POST doesn't work here)
$response = json_decode($str_json, true); // decoding received JSON to array
$lName = $response[0];
$age = $response[1];
echo '
<div align="center">
<h5> Received data: </h5>
<table border="1" style="border-collapse: collapse;">
<tr> <th> First Name</th> <th> Age</th> </tr>
<tr>
<td> <center> '.$lName.'<center></td>
<td> <center> '.$age.'</center></td>
</tr>
</table></div>
';
?>
I found easy way to do but I know it not perfect
1.assign json to
if you JSON is
var data = [
{key:1,n: "Eve"}
,{key:2,n:"Mom"}
];
in ---main.php ----
<form action="second.php" method="get" >
<input name="data" type="text" id="data" style="display:none" >
<input id="submit" type="submit" style="display:none" >
</form>
<script>
var data = [
{key:1,n: "Eve"}
,{key:2,n:"Mom"} ];
function setInput(data){
var input = document.getElementById('data');
input.value = JSON.stringify(data);
var submit =document.getElementById('submit');
//to submit and goto second page
submit.click();
}
//call function
setInput(data);
</script>
in ------ second.php -----
<script>
printJson();
function printJson(){
var data = getUrlVars()["data"];
//decode uri to normal character
data = decodeURI(data);
//for special character , / ? : @ & = + $ #
data = decodeURIComponent(data);
//remove " ' " at first and last in string before parse string to JSON
data = data.slice(1,-1);
data = JSON.parse(data);
alert(JSON.stringify(data));
}
//read get variable form url
//credit http://papermashup.com/read-url-get-variables-withjavascript/
function getUrlVars() {
var vars = {};
var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
vars[key] = value;
});
return vars;
}
</script>
You can easily convert object into urlencoded string:
function objToUrlEncode(obj, keys) {
let str = "";
keys = keys || [];
for (let key in obj) {
keys.push(key);
if (typeof (obj[key]) === 'object') {
str += objToUrlEncode(obj[key], keys);
} else {
for (let i in keys) {
if (i == 0) str += keys[0];
else str += `[${keys[i]}]`
}
str += `=${obj[key]}&`;
keys.pop();
}
}
return str;
}
console.log(objToUrlEncode({ key: 'value', obj: { obj_key: 'obj_value' } }));
// key=value&obj[obj_key]=obj_value&
PHP has a built in function called json_decode(). Just pass the JSON string into this function and it will convert it to the PHP equivalent string, array or object.
In order to pass it as a string from Javascript, you can convert it to JSON using
JSON.stringify(object);
or a library such as Prototype
Source: Stackoverflow.com