在php和dart之间发送数据

Question

So i am trying to communicate between dart clientside and a php server side using AJAX. Since direct execution is not possible. I compiled the dart to javascript and then run it on a apache server.

json data is generated at client end, But there is no response from the the server

dart code

import 'dart:html';
import 'dart:json';

void main() {
  query("#clicker").on.click.add(callServer);

}

void callServer(Event event) {
  var data ={ 'name':"sendname"}
  ,jsondata=stringify(data);
  print(jsondata);

  var req = new HttpRequest();
  req.open('post','http://localhost:8080/darttest/server.php',true);
  //req.setRequestHeader('Content-type','application/json');
  req.send(jsondata);
  print(req.responseText);
}

php side i just echo the content received

<?php

$name = $_POST['name'];
echo $name;

?>

This is my first try at dart programming, so do let me know if this approach is even possible

Answer 1

To read the response, you have to put your code in a callback on readyStateChange :

var req = new HttpRequest();
req.open('post','http://localhost:8080/darttest/server.php',true);
req.on.readyStateChange.add((e){
  if (req.readyState == HttpRequest.DONE && req.status == 200){
    print(req.responseText);
  }
});
req.send(jsondata);

With your code the http request was not processed when you tried to read the response. You have to wait the completion of the request to read the response.