I already looked up questions about this topic but couldn't figure my problem out.
I have a php file which contains the array:
$data = ['logged' => $_SESSION['loggedin'], 'sessName' => $_SESSION['name']];
echo json_encode($data);
Here's my AJAX code, but I have no idea what should I put in "data". Basically my goal is to use the $data array in my Javascript code. (So i can manipulate DOM with conditions).
<script>
$.ajax({
type: 'POST',
dataType: "json",
url:'sign-in.php',
data:
success: function(data)
{
try {
data = JSON.parse(data);
}catch(e) {}
console.log(data);
}
});
</script>
By specifying dataType: "json" in your $.ajax call, jQuery will automatically parse your JSON data into javascript object / array for you. You can probably remove the JSON.parse form you code.
Also there is an extra data: line, which would be a javascript syntax error.
<script>
$.ajax({
type: 'POST',
dataType: "json",
url:'sign-in.php',
success: function (data) {
console.log(data);
},
});
</script>
One more thing. Your PHP code, expects both 'loggedin' and 'name' to be set in your $_SESSION. If not, your PHP (depends on settings) might generate warning message in between and cause JSON parsing error.
You can use the null coalescing operator (introduced since PHP 7.0) to assign some value if either or both values are not set:
$data = [
'logged' => $_SESSION['loggedin'] ?? FALSE,
'sessName' => $_SESSION['name'] ?? '',
];
echo json_encode($data);
Updated: Add proper handling to potential invalid key issue.
In your example you haven't intiliaze the session with session_start(), also it recomanded to indicate the response content type, and i fix also your ajax request :
PHP :
session_start();
$data = [
'logged' => $_SESSION['loggedin'],
'sessName' => $_SESSION['name'],
];
header("Content-type: application/json");
echo json_encode($data);
exit();
Jquery :
$.ajax({
type: 'GET',
dataType: "json",
url:'sign-in.php',
success: function(data)
{
try {
data = JSON.parse(data);
} catch(e) {}
console.log(e);
}
}
});
Related
I am working on a site using HTML/CSS/JS and AJAX for connecting to the server. (new to web development)
I currently have this to get data and put it in an array.
var addresses = [];
$.ajax({
type: "GET",
url: 'GetAddresses.php',
data: {"type":"check"},
success: function(response){
alert(response);
addresses.push(response) // add values from php to array
}
});
But what if php echoed an address, a name, and a city for example. How could I access those different values?
Thank you for your help.
Typically you would write PHP that outputs structured data, e.g. JSON, and then parse that on the client.
<?php
header("Content-Type: application/json");
$data = [ "address" => "foo", "name" => "bar", "city" => "baz" ];
echo json_encode($data);
?>
and then on the client:
$.ajax({
type: "GET",
url: 'GetAddresses.php',
data: {"type":"check"},
success: function(response){
alert(response);
console.log(response.address);
console.log(response.name);
console.log(response.city);
}
});
Unrelated to the focus of your question, pushing data into an array in the wider scope from an Ajax callback is likely to cause you problems.
I have an array where I want to loop through the array inside the JSON and show the data in the table based on the nationalities in the array. The problem is that the array data contains backslashes and I can't loop through it. I retrieve the data with an AJAX call from my PHP file.
PHP:
$arr
if (!empty($arr)) {
echo json_encode($arr);
// print_r($arr);
} else{
$errors = 'No data available.';
}
exit;
If I print_r() I see: Array ( [0] => stdClass Object ( [company] => John Comp [pro_countries] => ["BR","ES","FR"])
If I use echo json_encode my echo looks like but I can print company in my Jquery: [{"company":"John Comp","nationality":"[\"BR\",\"ES\",\"FR\"]"}]
But if I use print_r($arr) the slashes disappear but I can't seem to print the company in Jquery: [{"company":"John Comp","nationality":"["BR","ES","FR"]"}]
If I use Print_r() Then my AJAX call in JQuery goes straight to the error response.
JQuery:
$.ajax({
type: 'GET',
url: 'testurl',
dataType: 'json',
processData: false,
cache: false,
success: function (response){
response.nationality.forEach((item)=>{
});
I also tried:
$.ajax({
type: 'GET',
url: 'testurl',
dataType: 'json',
processData: false,
cache: false,
success: function (response){
var data = JSON.parse(response);
data.nationality.forEach((item)=>{
});
What I want after the loop:
nationality is a JSON string, you need to parse it so you can loop over it.
JSON.parse(response.nationality).forEach(item => ...)
I'm not sure why you encoded nationality in the first place. You should just make it an ordinary PHP array, and then it will be encoded as part of $arr.
Goal: Serialize data, send them in HTTP POST request using AJAX, proceed data in PHP (and answer)
Problem: PHP $_POST variable seems to be empty
JS/AJAX
var postData = [cmd, data];
alert(postData = JSON.stringify(postData));
$.ajax({
url: "./backendTag.php",
type: "post",
data: postData,
dataType: 'json',
success: function (response) {
alert(response); // Empty
//logToServerConsole(JSON.parse(response));
},
error: function(jqXHR, textStatus, errorThrown) {
logToServerConsole("E3"); // Communication Error
console.log(textStatus, errorThrown);
}
});
PHP
<?php echo json_encode($_POST);
The reason for the same is probably because you are not posting properly in javascript. Before i add the codes, let me add a couple of tips on how to debug in these situations.
First is, you check if the request is properly formed. Inspect the network in browser dev tools.
Second method could be to use var_dump on $_POST to list out all the post parameters and check if they have been recieved in PHP
Now as far as the code goes
here is the javascript
$.ajax({
method: "POST",
url: "url.php",
data: { name: "John Doe", age: "19" }
}).done(function( msg ) {
alert(msg);
});
and in php you can simply check using
<?php
print $_POST["name"];
?>
which would work perfectly. Notice how the data in javascript is a list, while from what you wrote seems to be json string
Apparently we can't pass an array directly after serializing him. The following code resolved the problem. (Split array)
data = JSON.stringify(data);
var JSONdata = {"cmd" : cmd, "data" : data};
$.ajax({
url: "./backendTag.php",
type: "post",
data: JSONata,
dataType: 'json',
/* Handlers hidden*/
});
JSON content won't be parsed to the $_POST globals. If you want to reach them, try to get from php://input with:
file_get_contents('php://input')
And I suggest giving the content-type during the ajax request:
contentType: 'application/json',
If it's not working, try to set the data as a string, with JSON.Stringify, like the following:
data: JSON.stringify(postData)
So I'm trying to send a JSON as a string.
Then I have a PHP back-end that retrieves this JSON string and parses it using json_decode.
Unfortunately, I can't get to send this JSON as a string.
Here's the jQuery Ajax script I used:
var jsonString = JSON.stringify(checkables);
console.log(jsonString);
$.ajax({
url: $url,
type: 'POST',
data: {ajaxidate: JSON.stringify(jsonString)},
contentType: "application/json; charset=UTF-8",
success: function (data)
{
// just successful callback
},
error: function ()
{
// just error callback
}
});
Variable checkables contains raw form as JSON data:
After applying JSON.stringify(), this is now how it looks:
[{"name":"name","type":"multialphanumslug","value":"AD"},{"name":"server","type":"host","value":"10.1.1.1"},{"name":"port","type":"number","value":"8080"},{"name":"authid","type":"username","value":"barryallen"}]
At the back-end, I have this PHP script:
<?php
var_dump($_POST);
die();
?>
Now I suppose $_POST at back-end should now contain this:
array(
'ajaxidate' => "[{\"name\":\"name\",\"type\":\"multialphanumslug\",\"value\":\"AD\"},{\"name\":\"server\",\"type\":\"host\",\"value\":\"10.1.1.1\"},{\"name\":\"port\",\"type\":\"number\",\"value\":\"8080\"},{\"name\":\"authid\",\"type\":\"username\",\"value\":\"barryallen\"}]"
);
But it didn't receive anything. Here's the captured request:
The response from back-end?
I tried with POSTMan and I received an expected correct output:
Now that was ridiculous.
I'm stuck at this for 2 days trying to figure out what's going on or what did I miss. Any help will be greatly appreciated.
You need to parse the data on the server:
$myArray = json_decode($_POST['ajaxidate']);
var_dump($myArray);
Consider this:
<?php
$a = '[{"a": 1}]';
$b = json_decode($a);
var_dump($a);
var_dump($b);
?>
Output:
string(10) "[{"a": 1}]"
array(1) {
[0]=>
object(stdClass)#1 (1) {
["a"]=>
int(1)
}
}
dataType: 'json', tldr: Use It!
When setting dataType = json you tell jQuery that the response from the server should be interpreted as JSON and it will therefore parse it for you and give the parsed object / array as first argument to the success callback:
$.ajax({
// ...
dataType: 'json',
success: function(myJson) {
console.log(myJson); // this will be a JSON object/array...
}
});
As you mention dataType: json in your ajax call data need to be in json formate but using JSON.stringify convert Json object to json String that with make problem for you need to change
`var jsonString = JSON.stringify(checkables);`
to
var jsonString = checkables;
JSON.stringify()
Solved my own problem. Having #Munna suggested to use $.post() made me figure out to eliminate the unnecessary. From that case, the unnecessary is contentType option from $.ajax().
This is the updated working solution:
$.ajax({
url: $url,
type: 'POST',
data: {ajaxidate: JSON.stringify(jsonString)},
success: function (data)
{
// just successful callback
},
error: function ()
{
// just error callback
}
});
Thanks everyone who helped. Have a good day
I have a WAMP server with PHP 5.4.3 version. I encoded the data in JSON by php file below is the code (submit.php).
$username = 'User';
$comment = 'Test comment';
$date = date("Y-m-d G:i:s");
$image = '/img/sephiroth.png';
$return = array(
'username'=> $username,
'comment' => $comment,
'date' => $date,
'image' => $image );
echo json_encode($return);
Now i have a javascript file(script.js).
$.ajax({
type: "POST",
url: "submit.php",
data: dataString,
cache: false,
success: function(result){
alert(result); //It is showing all the JSON data.
$value = result;
$data = json_decode($value,true);
alert($data);
}
});
I want to decode all the JSON data separately. e.g Username, comment, date, image. So, i can show them on webpage, at the moment all data is coming together. I tried multiple times with multiple options (php array or result.username or result['username'] but no luck.
Now i am getting below error.
ReferenceError: json_decode is not defined
$data = json_decode($value,true);
you cannot use json_decode in JS json_decode is PHP function
use jQuery.parseJSON(json_data) to parse your json data;
jQuery.parseJSON( result );
Change
$value = result;
$data = json_decode($value,true);
To :
jQuery.parseJSON( result );
http://api.jquery.com/jQuery.parseJSON/
Try the following:
success: function(result){
var res = $.parseJSON(result);
var data = [res.username, res.comment, res.date, res.image]; // Array of the received response
}
This way you can get required output
try like below:
$.ajax({
type: "POST",
url: "submit.php",
data: dataString,
cache: false,
success: function(result){
alert(result); //It is showing all the JSON data.
jQuery.parseJSON( result );
}
});
Use the dataType option of ajax and set its value to json.
Then you can access the response as result['username']
My example:
Server-side returns {"username":"xxxxx","data":"xxxxxxxxxxxx and more"}
You can just deal with json like a javascript array, do not need to decode it.
the data below itself is the array of result.
$.ajax({
type: "POST",
url: "submit.php",
cache: false,
success: function(data){
var username = data['username'];
var data = data['data'];
//and so on
}
});
And make sure php sent the header Content-Type:application/json
header('Content-Type: application/json');