First, I put the array in localStorage into the variable.
var urls = JSON.parse(window.localStorage.getItem("urls"));
Now I need to transfer this array to a variable in php in the same page.
The ways I tried;
$urls = array();
for($i=0;$i<$count;$i++){
array_push($urls, "<script>document.write(urls[$i]);</script>");
}
Actually it kind of works.
<?php echo $urls[$i];?>
Normally when I say print to the screen, the variable works the way I want.
But
<a href="download.php?urls=<?php echo $urls[$i]; ?>" style="text-decoration: none">
When I say, the variable returns empty.
Or, when I say <img src = "<?php $urls [$i]; ?> it also returns blank.
AJAX
I tried very hard with Ajax and could not reach the result I wanted. My code is working. The problem is: I'm returning the variable with JS, but I can't use the variable over and over in php. I want to keep the variable in php and use it in php on the same page.
COOKIES
It worked for me perfectly. It meets what I want.
But
Data overload happened and crashed.
I do not intend to use it.
In short, I need to transfer an array in javascript to an array in PHP. I will use the array I transferred to PHP among php codes continuously.
Or isn't what I want is possible because php is a server-side language?
NOTE: My knowledge of JavaScript or PHP is limited. The primary language I use is SWIFT. I have been working on this problem for a long time. Thank you for your support.
In JavaScript you can fetch.
fetch("https://yourapi.api",
{
headers: {
"Content-Type": "application/json",
},
method: "POST",
body: JSON.stringify({
url: [
"https://otherurl1.url",
"https://otherurl2.url",
"https://otherurl3.url"
]
})
});
If window.localStorage.getItem("urls") is array you can put url:JSON.stringify(window.localStorage.getItem("urls"))
and In PHP you can get
$content = trim(file_get_contents("php://input")); //this will catch POST from JavaScript
$decoded = json_decode($content, true); //this will decode from JSON to PHP array
foreach($decoded['url'] as $url){
echo $url;
}
$decoded will be your array as PHP array
in PHP you can also check if post was sent as JSON
if ($_SERVER["CONTENT_TYPE"] === "application/json") {
$content = trim(file_get_contents("php://input"));
$decoded = json_decode($content, true);
}
To see as function/method, JavaScript will look like this
let fetchApi = () => {
fetch("https://yourapi.api",
{
headers: {
"Content-Type": "application/json",
},
method: "POST",
body: JSON.stringify({
url: window.localStorage.getItem("urls")
})
});
};
and PHP, you can use this everywhere
public static function get_data_from_js(){
$contentType = isset($_SERVER["CONTENT_TYPE"]) ? trim($_SERVER["CONTENT_TYPE"]) : '';
$decoded = [];
if ($contentType === "application/json") {
$content = trim(file_get_contents("php://input"));
$decoded = json_decode($content, true);
}else{
//You can do here anything
}
return $decoded;
}
Related
I have some PHP and JavaScript that works by PHP updating a MySQL database, and then outputting the updated code back onto the page without a hard refresh using the JavaScript fetch() method. This code works, but there is a part I don't understand — why is it when the json_encode() PHP method is used, which converts the data to a JSON string, when it is then used in the JavaScript it is automatically being converted into a JavaScript object without JSON.parse() being used?
In the Javascript when I use JSON.parse() it understandly throws an error, because the data isn't a string (which initially caused some confusion), when I console log the json variable being used in the JavaScript it does indeed return a JavaScript object where I can access its properties and methods etc.
There is no other JSON or json_encode() being used on the page (or indeed the site).
Also in the PHP script it echoes the JSON with echo json_encode($board_row); when the data is fetched from the database, before any HTML content is outputted. When I try and echo this in the HTML to see the value of json_encode($board_row); it just outputs the word false. I don't understand what is going on there either?
If I manually add a simply array into the HTML such as $arr = array('a' => 1, 'b' => "hello", 'c' => null); and then echo that in the HTML with echo json_encode($arr); as excepted it outputs a JSON string.
If someone could kindly explain why this is happening, that would be wonderful.
PHP
if (isset($_POST['submit-board-name'])) {
$create_board_name = $_POST['create-board-name'];
try {
// insert into database
$createBoardSQL = "
INSERT INTO boards (board_name, user_id)
VALUES (:board_name, :user_id )
";
$bstmt = $connection->prepare($createBoardSQL);
$bstmt->execute([
':board_name' => $create_board_name,
':user_id' => $db_id
]);
// ----- fetch as JSON
if(isset($_POST['json_response'])) {
$board_stmt = $connection->prepare("
SELECT * FROM `boards` WHERE `user_id` = :user_id
AND `board_name` = :board_name
ORDER BY `board_id` DESC");
$board_stmt -> execute([
':user_id' => $db_id,
':board_name' => $create_board_name
]);
$board_row = $board_stmt->fetch();
header('Content-type: application/json');
echo json_encode($board_row);
exit;
}
} catch(PDOException $e) {
echo "Error: " . $e->getMessage();
}
}
JavaScript
let boardModuleForm = document.querySelector('.board-module-form');
// URL details
let myURL = new URL(window.location.href),
pagePath = myURL.pathname;
if (boardModuleForm) {
boardModuleForm.addEventListener('submit', function (e) {
if (e.submitter && e.submitter.classList.contains('js-fetch-button')) {
e.preventDefault();
var formData = new FormData(this);
formData.set(e.submitter.name, e.submitter.value);
formData.set('json_response', 'yes');
fetch (pagePath, {
method: 'post',
body: formData
})
.then(function(response) {
if (response.status === 200) {
response.json().then(function(json){
const newBoardName = json.board_name,
boardId = json.board_id;
const newButton = `
<button name="board-name" type="submit">
<span>${newBoardName}</span>
<span style="margin:0" class="add-icon flex">+</span>
</button>
<input class="board-id-value" type="hidden" value="${boardId}">
`
// add new button from above onto page
document.querySelector('.board-list').insertAdjacentHTML('afterbegin', newButton);
});
}
})
.catch(function(error) {
console.error(error);
})
}
})
}
In the handler for your fetch response, you call response.json().then(...). This is already doing the JSON parsing for you without needing to call JSON.parse manually.
So i have this code that posts to a php file,
var values = {
'socketid': data.socketid,
'id': memberid.value
};
console.log(values);
$.ajax({
url: "continue.php",
type: "POST",
data: values,
});
but i am unsure how to get each seperate value from the php file continue.php, do i ruse $_REQUEST or something, im just not sure if i have to parse or anything, could i get an example on how i can do this
Since you are using POST method just:
$socketid = $_POST['socketid'];
$id = $_POST['id'];
$_REQUEST is to check both $_GET and $_POST at the same time but it is not necessay in your code
$_POST should work fine since your request is of type POST
Your continue.php will get values in the following way:
<?php
$socket_id=$_POST['socketid'];
id=$_POST['id'];
?>
For simple post use $.post() it's a shorthand for $.ajax() for POST request.
var values = {
'socketid': data.socketid,
'id': memberid.value
};
$.post('continue.php', values, function (response) {
var res = JSON.parse(response);
if (res.results == true) {
console.log('Data updated');
}else {
console.log('Data not updated');
}
})
In your PHP
<?php
$socket_id = $_POST['socketid'];
$id = $_POST['id'];
// here update your data/ use
// then send response to javascript
// echo json_encode(['results' => true]); for success
// echo json_encode(['results' => true]); for fail
I was wondering if you could help. I am attempting to pass a variable to a PHP file, then run a SQL query, using that variable, then pass back the result as a variable to the javascript. Currently, I have successfully received the PHP back to the javascript using Ajax, but not able to sending the ServiceName to the PHP File. It is essential that the files stay separate. Also just to clarify I have replaced certain sections for privacy, however, they are correct and working in the code. I have also used a $_GET method already, however, I could only get the javascript to access a new window and not return the PHP variable.
My current code is as follows:
// If the user changes the ServiceID field.
if (sender.getFieldName() == 'ServiceID')
// Declare the value of the new Service name and save it in the variable A.
a = sender.getValue();
{
// if it equals a new variable.
if (sender.getValue() == a) {
// Place it within the URL, in order for it to be processed in the php code.
window.location.href = "http://IP/development/Query01.php?service=" + a;
// Attempted code
// echo jason_encode(a);
// $.ajax({var service = a;
// $.post('http://IP/development/Query01.php', {variable: service});
// }
//use AJAX to retrieve the results, this does work if the service name is hard coded into the PHP.
$.ajax({
url: "http://IP/development/Query01.php",
dataType: "json", //the return type data is jsonn
success: function(data) { // <--- (data) is in json format
editors['Contact2'].setValue(data);
//alert(data);
//parse the json data
}
});
}
}
}
<?php
$serverName = "SeverIP"; //serverName\instanceName, portNumber (default is 1433)
$connectionInfo = array( "Database"=>"DatabaseName", "UID"=>"Username", "PWD"=>"Password
$conn = sqlsrv_connect( $serverName, $connectionInfo);
$service = $_GET['service'];
if ($conn)
{
//echo "Connection established.<br />";
}
else
{
echo "Connection could not be established.<br />";
die( print_r( sqlsrv_errors(), true));
}
$sql = ("SELECT DefaultContact2 FROM tblServices WHERE ServiceName = '$service'");
$stmt = sqlsrv_query($conn, $sql);
if ($stmt === false)
{
die( print_r( sqlsrv_errors(), true));
}
while ($row = sqlsrv_fetch_array( $stmt, SQLSRV_FETCH_ASSOC))
{
$dC2 = $row['DefaultContact2'];
}
echo json_encode ($dC2);
sqlsrv_free_stmt( $stmt);
?>
Any help would be greatly appreciated.
You could send data using your Ajax request like so.
$.ajax({
url: "http://IP/development/Query01.php",
method: "POST" // send as POST, you could also use GET or PUT,
data: { name: "John", location: "Boston" }
dataType: "json",
success: function(data) {
editors['Contact2'].setValue(data);
}
});
Then in PHP access the sent data:
<?php
print_r($_POST);
/*
[
"name" => "John",
"location" => "Boston"
]
*/
?>
You cannot pass the javascript's variable to php on same page.
You can do this with ajax call with POST or GET method, and then you can send the manipulated data back to you browser and store it in your javascript's object or variable.
You can do it in a single Ajax call.
Remove from your code this line:
window.location.href = "http://IP/development/Query01.php?service=" + a;
And modify a bit the Ajax call
$.ajax({
type: 'GET'
data : {
service: sender.getValue();
},
url: "http://IP/development/Query01.php",
dataType: "json", //the return type data is jsonn
success: function(data){ // <--- (data) is in json format
editors['Contact2'].setValue(data);
//alert(data);
//parse the json data
}
});
I put the same variable name for the Get in the Ajax call. But I don't know if your query01.php should accept to do now both actions in the same call.
Thank you guys for your help. Just thought it would be useful, if I posted of what I went with in the end, regardless of whether it is the right way, it certainly done the job.
// If the user changes the ServiceID field.
if (sender.getFieldName() == 'ServiceID')
{
// Variable Declaration
serviceName = sender.getValue();
{
// Use JQuery.Ajax to send a variable to the php file, and return the result.
$.ajax({
// Access the PHP file and save the serviceName variable in the URL, to allow the $_GET..
// method to access the javascript variable to apply it within the SQL Query.
url: "http://ServerName/development/DefaultContact1.php?service=" + serviceName,
// retrieve the result, using json.
dataType: "json", // the return type data is jsonn
success: function(data)// <--- (data) is in json format
{
// pre-fill the contact1 field with the result of the PHP file.
editors['Contact1'].setValue(data);
}
// End of Ajax Query
});
// End of function to prefill Contact1 field.
Thank again for your responses!
I'm making an interpreter for a mini language, and I'm storing related information in hash maps. I'm convering those hash maps with JSON stringify, to send them over via ajax to the server side.
This is is the post-JSON stringify code I'm sending over to the server side:
{"kv":["24","23","20"],"interface":"dropdown"},{"ma":["2","3","4"],"interface":"button"}
On the server side, how could I easily make a php array out of the "kv":["24","23","20"] bit without searching for certain characters?
Before sending it over ajax the output of json array is:
{"kv":["24","23","20"],"interface":"dropdown"},{"ma":["2","3","4"],"interface":"button"}
After receiving it, the data is:
{"kv":["24","23","20"],"interface":"dropdown"},{"ma":["2","3","4"],"interface":"button"}
after the htmlspecialchars_decode function, it becomes:
{"kv":["24","23","20"],"interface":"dropdown"},{"ma":["2","3","4"],"interface":"button"}
json_decoding that gives me null
The ajax code:
function addValues(jsonArray) {
alert(jsonArray);
$.ajax({
url: 'insertTree.php',
type: 'POST',
data: 'dataToReceive=' + jsonArray,
success: function(data) {
//called when successful
alert(data);
window.location.reload();
},
error: function(e) {
//called when there is an error
console.log(e.message);
}
});
}
the php receiving code:
$dataReceived = htmlspecialchars(strip_tags($_POST["dataToReceive"]));
$dataRefined = htmlspecialchars_decode($dataReceived);
$var = json_decode($dataRefined, true);
var_dump($var['kv']); //null
Use json_decode to get the value. Since your base string isn't valid JSON, I massaged it a bit to get it to be
$string = '{"kv":["24","23","20"],"interface":"dropdown"},{"ma":["2","3","4"],"interface":"button"}';
$data = explode('|', str_replace('},{', '}|{', $string));
foreach($data as $str) {
$var = json_decode($str, true);
if(isset($var['kv'])) var_dump($var['kv']);
}
(Secondary title): ajax array recieved as json encoded PHP array not behaving as javascript array
For some reason, my PHP array gets sent over to JavaScript just fine, but when I try to access an individual key of the array, it doesn't return anything, or it returns some other value which doesn't correspond. I am of course using json_encode() in the corresponding PHP file (echoClientData.php):
$id = $_GET['selected_id'];
$id = str_replace("clientSel","",$id);
$getclientinfo = "SELECT * FROM `clients` WHERE `ClientID` = $id";
if ($result = $Database->query($getclientinfo))
{
$row = $result->fetch_row();
$output = $row;
}
echo json_encode($output);
This code works fine:
$.ajax(
{
url: "echoClientData.php?selected_id=" + HTMLid,
type: 'GET',
success: function(data)
{
test = data;
$('#client-detail-box').html(test);
}
});
And returns an array into the #client-detail-box div, e.g.
["1566","","Adrian","Tiggert","","","","","","","","","","","","0000-00-00","0000-00-00","0.00","","0","","","102","Dimitri Papazov","2006-02-24","102","Dimitri Papazov","2006-02-24","1","0","0"]
However, when I do
$.ajax(
{
url: "echoClientData.php?selected_id=" + HTMLid,
type: 'GET',
success: function(data)
{
test = data[3]; // should be "Tiggert"
$('#client-detail-box').html(test);
}
});
}
It returns
5
You may need to do one of two things when returning JSON from PHP.
Either set your content type in PHP before echoing your output so that jQuery automatically parses it to a javascript object or array:
header('Content-type: application/json');
or specify that jQuery should treat the returned data as json:
$.ajax(
{
url: "echoClientData.php?selected_id=" + HTMLid,
type: 'GET',
dataType: 'json',
success: function(data)
{
var test = data[3]; // should be "Tiggert"
$('#client-detail-box').html(test);
}
});
Be aware, that in your current PHP script, in the event that your query fails, you will be json_encodeing an undefined variable.
Also, your PHP code is entirely open to SQL injection. Make sure you sanitize your $id, either by casting it to (int) or by escaping it before sending it through in your query.
Have you tried using JSON.parse on the value you are getting back from PHP?
e.g.
$.ajax(
{
url: "echoClientData.php?selected_id=" + HTMLid,
type: 'GET',
success: function(data)
{
test = JSON.parse(data); // should be "Tiggert"
$('#client-detail-box').html(test[3]);
}
});
That seems like it would be a fix.