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JSON Timed Ajax PHP MySQL Data Request Web Application

In this final lesson of the series we demonstrate how to request and parse JSON formatted PHP MySQL database data. To show the functionality we create a timed random MySQL JSON data request application using Ajax that you can run on your web pages. json_mysql_data.php <?php header("Content-Type: application/json"); if(isset($_POST['limit'])){ $limit = preg_replace('#[^0-9]#', '', $_POST['limit']); require_once("connect_db.php"); $i = 0; $jsonData = '{'; $sqlString = "SELECT * FROM tablename ORDER BY RAND() LIMIT $limit"; $query = mysql_query($sqlString) or die (mysql_error()); while ($row = mysql_fetch_array($query)) { $i++; $id = $row["id"]; $title = $row["title"]; $cd = $row["creationdate"]; $cd = strftime("%B %d, %Y", strtotime($cd)); $jsonData .= '"article'.$i.'":{ "id":"'.$id.'","title":"'.$title.'", "cd":"'.$cd.'" },'; } $now = getdate(); $timestamp = $now[0]; $jsonData .= '"arbitrary":{"itemcount":'.$i.', "returntime":"'.$timestamp.'"}'; $jsonData .= '}'; echo $jsonData; } ?> JSON_tutorial_7.html <!DOCTYPE html> <html> <head> <style> div#databox { padding:12px; background: #F3F3F3; border:#CCC 1px solid; width:550px; height:310px; } </style> <script> var myTimer; function ajax_json_data(){ var databox = document.getElementById("databox"); var arbitrarybox = document.getElementById("arbitrarybox"); var hr = new XMLHttpRequest(); hr.open("POST", "json_mysql_data.php", true); hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); hr.onreadystatechange = function() { if(hr.readyState == 4 && hr.status == 200) { var d = JSON.parse(hr.responseText); arbitrarybox.innerHTML = d.arbitrary.returntime; databox.innerHTML = ""; for(var o in d){ if(d[o].title){ databox.innerHTML += '<p><a href="page.php?id='+d[o].id+'">'+d[o].title+'</a><br>'; databox.innerHTML += ''+d[o].cd+'</p>'; } } } } hr.send("limit=4"); databox.innerHTML = "requesting..."; myTimer = setTimeout('ajax_json_data()',6000); } </script> </head> <body> <h2>Timed JSON Data Request Random Items Script</h2> <div id="databox"></div> <div id="arbitrarybox"></div> <script>ajax_json_data();</script> </body> </html>
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