Javascript: Using server-sent events with PHP? -


i'm trying first time use server sent events inmy project , i'm quite excited it. because can goodbye ajax. ( love ajax not i'm doing now).

any way, tried use server sent events check ping server (php script) , if ping happens, show simple alert('hello world'); in page.

however, don't know why never in page.. no errors either indicate went wrong.

this javascript server sent code:

var pin =localstorage.getitem("pin");  var evtsource = new eventsource("https://example.com/check-for-orders.php?pin="+pin+"");     evtsource.addeventlistener("ping", function(e) {           var data = json.parse(e.data);           alert(data);          alert('hello world');  }, false);

and php code:

<?php header("access-control-allow-origin: *"); header("content-type: text/event-stream"); header("cache-control: no-cache"); //header("connection: keep-alive");  session_start(); //don't forget enable mod_headers module in httpd.conf. include "../config/connect.php"; // block grabs whole list viewing  $pin = $_get['pin'];  $pin2 = $pin.', ';  $sql = "select * orders something=0 limit 1"; $query = mysqli_query($db_conx, $sql); $productcount2 = mysqli_num_rows($query ); if ($productcount2 > 0) {     while($row = mysqli_fetch_array($query, mysqli_assoc)){          $id2 = $row["id"];      $full_address = $row["full_address"];         $drop_address = $row["drop_address"];          $uphone = $row["uphone"];          $ulat = $row["ulat"];          $ulng = $row["ulng"];          $order_id = $row["order_id"];    echo "event: ping\n";  echo "".$order_id." - pick location: ". $full_address .""; echo "<br /><br />"; echo "drop location: ".$drop_address.", phone: ".$uphone."";     } } else {  } mysqli_close($db_conx); ?>

could please advise on issue?

any appreciated.

you need put code in try.....catch block, if error occuers show there.

try  {     header("access-control-allow-origin: *");     header("content-type: text/event-stream");     header("cache-control: no-cache");      session_start();     include "../config/connect.php";      $pin = $_get['pin'];     $pin2 = $pin.', ';      $sql = "select * orders something=0 limit 1";     $query = mysqli_query($db_conx, $sql);     $productcount2 = mysqli_num_rows($query );     if ($productcount2 > 0)      {        while($row = mysqli_fetch_array($query, mysqli_assoc))        {        $id2 = $row["id"];        $full_address = $row["full_address"];        $drop_address = $row["drop_address"];        $uphone = $row["uphone"];        $ulat = $row["ulat"];        $ulng = $row["ulng"];        $order_id = $row["order_id"];        echo "event: ping\n";        echo "".$order_id." - pick location: ". $full_address ."";        echo "<br /><br />";        echo "drop location: ".$drop_address.", phone: ".$uphone."";      }    }     else {     }    mysqli_close($db_conx); }  catch (exception $e)  {     echo 'caught exception: ',  $e->getmessage(), "\n"; }

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