javascript - Ajax mysql long polling -


i'm working on ajax long polling function mysql , doesn't seem work. computer overheating , website crashes after minutes. also, poll.php doesn't receive content data.php, instead, poll.php shows {"type":"connect_error).

i have not done long polling before.

i have 3 files:

data.php

<?php  session_start();  define ('db_host', 'localhost'); define ('db_user', 'root'); define ('db_password', 'root'); define ('db_name', 'story_creator');  function sqlselect($query) {  // create connection $conn = mysqli_connect(db_host, db_user, db_password, db_name); // check connection if ($conn->connect_error) {     die("connection failed: " . $conn->connect_error); }  $result = mysqli_query($conn, $query);  // check connection if (mysqli_errno($conn)) {     echo "failed: " . mysqli_error($conn); }  $resultarray = array();  if ($result) {       while ($row = mysqli_fetch_array($result)) {         $resultarray[] = $row;     } }  return $resultarray;  }  $news = sqlselect("select type users_news_feed user_id =               {$_session['user_id']} , date > 0;");  echo json_encode($news);  ?>

poll.php

<?php  $filename = 'data.php';  $lastmodif = isset($_post['timestamp'])? $_post['timestamp']: 0; $currentmodif = filemtime($filename);  while ($currentmodif <= $lastmodif) {     usleep(10000);     clearstatcache();     $currentmodif = filemtime($filename); }   $response = array(); $response['type'] = file_get_contents($filename); $response['timestamp'] = $currentmodif; echo json_encode($response);  ?>

javascript

<script>     var timestamp = null;      function waitformsg(){     $.ajax({     type: "post",     url: "functions/poll.php",     async: true,     cache: false,     timeout: 50000, /* timeout in ms */     data: { 'timestamp': timestamp },     success: function(data){     // if(data == ''){         // console.log data         console.log(data);     setinterval(         waitformsg(), /* try again after.. */         1000); /* milliseconds (15seconds) */     // }     },     complete: function(){         setinterval(waitformsg(), 7000);     } }); } $(document).ready(function() {     waitformsg(); }); </script>


-

Comments

Post a Comment

Popular posts from this blog

c# - Binding a comma separated list to a List<int> in asp.net web api -

the default binder in web api expecst http://url.com/webapi/report/?pageids=3243&pageids=2365 to bind public ihttpactionresult report(list<int> pageids){ // exciting webapi code} i wish bind http://url.com/webapi/report/?pageids=3243,2365 as running out of space in url get . i have created class public class commaseparatedmodelbinder : system.web.http.modelbinding.imodelbinder { public bool bindmodel(httpactioncontext actioncontext, modelbindingcontext bindingcontext) { //binding in here } } and registered in webapiconfig.cs var provider = new simplemodelbinderprovider( typeof(list<int>), new commaseparatedmodelbinder()); config.services.insert(typeof(modelbinderprovider), 0, provider); i have altered method signature use model binder so public ihttpactionresult report( [modelbinder] list<int> pageids){ // exciting webapi code} however break point in binder not being
Read more

Delphi 7 and decode UTF-8 base64 -

in delphi 7, have widestring encoded base64(that received web service widestring result) : pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg== when decoded it, result not utf-8: <?xml version="1.0"?> <string>طھط³طھ</string> but when decoded base64decode.org, result true : <?xml version="1.0"?> <string>تست</string> i have use encddecd unit decodestring function. the problem have using decodestring . function, in delphi 7, treats decoded binary data being ansi encoded. , problem text utf-8 encoded. to continue encddecd unit have couple of options. can switch decodestream . instance, code produce utf-8 encoded text file data: {$apptype console} uses classes, encddecd; const data = 'pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg=='; var input: tstringstream; output: tfilestream; begin input := tstringstream.create(data); try output := tfilestream.
Read more

html - Is there any way to exclude a single element from the style? (Bootstrap) -

so, have img logo, overlaid on div styled background-image: url("...") , , both elements inside 2 div classes .to-color , .to-overlay respectively, black transparent overlay. is there way exclude logo style given these 2 classes? here's jsfiddle example: link html , css example: - html - <div class="to-color"> <div class="to-overlay"> <div class="respo"> <div class="row"> <div class="col-xs-4 col-xs-offset-4 text-center"> <img src="http://ansonalex.com/wp-content/uploads/2011/06/google-logo-768x260.png" alt="..." class="img-responsive"> </div> </div> </div> </div> </div> - css - .to-color { background-color: #000; } .to-overlay { opacity : 0.5; } .respo { background-image: url("https://source.unsplash.com/category/objects/1600x900"); background-position: center center;
Read more