如何使用AJAX和JSON发送和接收

Question

I'm trying to setup a simple AJAX call that sends it's data via JSON to my PHP script, which then returns the data.

But I am having no luck.

Here is my code for sending:

$.ajax({
      url: ROOT+'Address/fetchAddress',
      type: 'POST',
      async: false,
      dataType: 'json',
      data: {
        json: {
          "Id":"0",
          "Name":"Jim"
        }
      },
      error: function(a, b)
      {
        alert(b)
      },
      success: function(data)
      {
        data = $.parseJSON(data);
        alert(data)
      }
    })

Serverside:

public function fetchAddress()
  {
    $JSON = $_POST['json'];
    echo json_decode($JSON);
  }

But I am getting "parseerror" in alert box and if I inspect the response I get:

Warning: json_decode() expects parameter 1 to be string, array given in ...public_html\controllers\Address.php on line 20

Answer 1

There's a conceptual mistake here.

When you say dataType: 'json' it means returned data is in JSON format.

You are still sending data in a POST array

public function fetchAddress(){
    echo $_POST['json'];
}

to fetch the data

To pick up on the other side you have a pre-passed object (as data is returned as JSON)

So

success: function(data)
  {

    alert(data.id+"NAME"+data.name);
  }

(Oh and your data is not a string (which a post expects) and JSON is so clean it up into a nice string

json: '{"Id":"0","Name":"Jim"}'