run a function every second without reloading page.

[MadnessRed]

ok, could someone help me as I am a bit stuck.

What i want is for a php script to run every x seconds, then if the script returns true I want it to reload the page.

 

so here is an example.

 

//loop this code ever 1 second
loop{
    $qry = mysql_query("select * from `table` where `read` = '0' ;");
    if(mysql_num_rows($qry) > 0){ header("location: messages.php"); }
}

 

the actually code is not real but it shows what I would like, also the loop is made up. but I am wondering if there is a real version or something similar.

 

 

[Orio]

You'll need to look into AJAX. Your client side script (JS) will count the x seconds, and then send behind the scenes a request to your server. The server will check if there are new records, and return the result (true/false) back to the client side script. From there the script could decide whether to reload the page or not.

 

The whole "behind the scenes" part is done using AJAX.

 

Orio.

[MadnessRed]

ahh, thats sounds complicated.

 

is it possible to reload one frame from another

 

so I have 1 page which reloads every second and a second which page whch can be reloaded from the first page.

[The Little Guy]

Make sure to respect your hosts resources (if you have a web host). Making a request to the server every so often can put a large load on the web server.

 

Here is your sample AJAX/JavaScript:

 

function ajaxPost(){
   var contentType = "application/x-www-form-urlencoded; charset=UTF-8";
   var ajaxRequest;
   try{
      ajaxRequest = new XMLHttpRequest();
   } catch (e){
      try{
         ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e) {
         try{
            ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
         } catch (e){
            alert("Your Browser Doesn't support AJAX.");
            return false;
         }
      }
   }
   return Array(ajaxRequest,contentType);
} 

setInterval ( "myFunction()", 30000 ); // every seconds
function myFunction(){
   connect = ajaxPost();
   connect[0].onreadystatechange = function(){ 
      if(connect[0].readyState == 4){
         eval(connect[0].responseText);
         alert(cTime);
      }
   }
   var va = '';
   connect[0].open("POST", '/mypage/file.php', true);
   connect[0].setRequestHeader("Content-Type", connect[1]);
   connect[0].send(va);
}

 

 

Your example PHP:

 

if(date("a") == 'am'){
     echo 'var cTime = "Good Morning!";';
}else{
     echo 'var cTime = "Good Evening!";';
}

[Andy-H]

ahh, thats sounds complicated.

 

is it possible to reload one frame from another

 

so I have 1 page which reloads every second and a second which page whch can be reloaded from the first page.

 

<script type="text/javascript">
parent.frameName.location.reload(true);
</script>