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jquery – Sending JSON to PHP using ajax

Posted by: admin April 23, 2020 Leave a comment

Questions:

I want to send some data in json format to php and do some operation in php. My problem is i can’t send json data via ajax to my php file.Please help me how can i do that. I have tried this way..

<script>
$(function (){
 $("#add-cart").click(function(){
    var bid=$('#bid').val();
    var myqty=new Array()
    var myprice=new Array()

    qty1=$('#qty10').val();
    qty2=$('#qty11').val();
    qty3=$('#qty12').val();

    price1=$('#price1').val();
    price2=$('#price2').val();
    price3=$('#price3').val();

    var postData = 
                {
                    "bid":bid,
                    "location1":"1","quantity1":qty1,"price1":price1,
                    "location2":"2","quantity2":qty2,"price2":price2,
                    "location3":"3","quantity3":qty3,"price3":price3
                }
    var dataString = JSON.stringify(postData);

    $.ajax({
            type: "POST",
            dataType: "json",
            url: "add_cart.php",
            data: {myData:dataString},
            contentType: "application/json; charset=utf-8",
            success: function(data){
                alert('Items added');
            },
            error: function(e){
                console.log(e.message);
            }
    });
});
});
</script>

And in PHP i use:

if(isset($_POST['myData'])){
 $obj = json_decode($_POST['myData']);
 //some php operation
}

When in add print_r($_POST) in php file, it shows array(0) {} in firebug.

How to&Answers:

Lose the contentType: "application/json; charset=utf-8",. You’re not sending JSON to the server, you’re sending a normal POST query (that happens to contain a JSON string).

That should make what you have work.

Thing is, you don’t need to use JSON.stringify or json_decode here at all. Just do:

data: {myData:postData},

Then in PHP:

$obj = $_POST['myData'];

Answer:

That’s because $_POST is pre-populated with form data.

To get JSON data (or any raw input), use php://input.

$json = json_decode(file_get_contents("php://input"));

Answer:

To send javascript obj to php using json and ajax:

js:

var dataPost = {
   "var": "foo"
};
var dataString = JSON.stringify(dataPost);

$.ajax({
   url: 'server.php',
   data: {myData: dataString},
   type: 'POST',
   success: function(response) {
      alert(response);
   }
});

to use that object in php:

$obj = json_decode($_POST["myData"]);

echo $obj->var;

Answer:

If you want to get the values via the $_POST variable then you should not specify the contentType as "application/json" but rather use the default "application/x-www-form-urlencoded; charset=UTF-8":

JavaScript:

var person = { name: "John" };

$.ajax({
    //contentType: "application/json", // php://input
    contentType: "application/x-www-form-urlencoded; charset=UTF-8", // $_POST
    dataType : "json",
    method: "POST",
    url: "http://localhost/test/test.php",
    data: {data: person}
})
.done(function(data) {  
    console.log("test: ", data);
    $("#result").text(data.name);
})
.fail(function(data) {
    console.log("error: ", data);
});

PHP:

<?php

// $_POST

$jsonString = $_POST['data'];

$newJsonString = json_encode($jsonString);
header('Content-Type: application/json');
echo $newJsonString;

Else if you want to send a JSON from JavaScript to PHP:

JavaScript:

var person = { name: "John" };

$.ajax({
    contentType: "application/json", // php://input
    //contentType: "application/x-www-form-urlencoded; charset=UTF-8", // $_POST
    dataType : "json",
    method: "POST",
    url: "http://localhost/test/test.php",
    data: person
})
.done(function(data) {  
    console.log("test: ", data);
    $("#result").text(data.name);
})
.fail(function(data) {
    console.log("error: ", data);
});

PHP:

<?php

$jsonString = file_get_contents("php://input");
$phpObject = json_decode($jsonString);

$newJsonString = json_encode($phpObject);
header('Content-Type: application/json');
echo $newJsonString;

Answer:

I believe you could try something like this:

var postData = 
            {
                "bid":bid,
                "location1":"1","quantity1":qty1,"price1":price1,
                "location2":"2","quantity2":qty2,"price2":price2,
                "location3":"3","quantity3":qty3,"price3":price3
            }
$.ajax({
        type: "POST",
        dataType: "json",
        url: "add_cart.php",
        data: postData,
        success: function(data){
            alert('Items added');
        },
        error: function(e){
            console.log(e.message);
        }
});

the json encode should happen automatically, and a dump of your post should give you something like:

array(
    "bid"=>bid,
    "location1"=>"1",
    "quantity1"=>qty1,
    "price1"=>price1,
    "location2"=>"2",
    "quantity2"=>qty2,
    "price2"=>price2,
    "location3"=>"3",
    "quantity3"=>qty3,
    "price3"=>price3
)

Answer:

just remove:

...
//dataType: "json",
url: "index.php",
data: {myData:postData},
//contentType: "application/json; charset=utf-8",
...

Answer:

You are tryng to send js array with js object format.

Instead of use

var a = new array();
a['something']=...

try:

var a = new Object();
a.something = ...

Answer:

I know it’s been a while, but just in case someone still needs it:

The JSON object I need to pass:

0:{CommunityId: 509, ListingKey: "20281", Type: 10, Name: "", District: "", Description: "",…}
1:{CommunityId: 510, ListingKey: "20281", Type: 10, Name: "", District: "", Description: "",…}

The Ajax code:

data: JSON.stringify(The-data-shows-above),
type: 'POST',
datatype: 'JSON',
contentType: "application/json; charset=utf-8"

And the PHP side:

json_decode(file_get_contents("php://input"));

It works for me, hope it can help!