CODEWITHSUNDEEP
phpjqueryajax
datether
datether

Reputation: 163

PHP / Ajax / Jquery ? Keep polling external PHP script till it returns a value

I have a main.php page which I want to show a message like : "Checking for completion.."

Main.php will keep calling (without leaving the page) "function.php",

function.php returns with a boolean .

If function.php returns true: I want main.php to write that the operation completed if it returns false, it will need to keep checking untill it returns true.

I am unfamiliar with Ajax/JQuery but from what I understood it might be the best approach. Is someone able to provide me a (working) example of how to accomplish this ?

Thanks!

Upvotes: 0

Views: 373

Answers (3)

Erwin Moller
Erwin Moller

Reputation: 2408

In summary: You main.php delivers HTML to a webbrowser. In your HTML you write some JavaScript (using XHR/'AJAX') that will start polling the server to check if a certain process is completed.

The script on the server (functions.php) returns true or false to the client. In case of false, you want to check again in, say 5 seconds. Right?

If this is all new to you, you have a lot to dive into, but here are a few pointers:

Good introduction to XMLHttpRequest

How to use window.setTimeout

If you only want a true or false returnvalue, you don't have to use XML. Just let the server return "true" or "false" as a string.

And last: Make sure your functions.php doesn't need to perform heavy operations to find out if the "process" is finished. If you do, you will put a lot of load on the server during the polling if you have many clients using the page.

Upvotes: 1

Think Different
Think Different

Reputation: 2815

main.php

<script type="text/javasctipt">
   var interval = window.setInterval(function(){
       $.ajax({
          type: 'POST',
          data: {key1: value1, key2: value2},
          url: 'function.php',
          success: function(response){
              if(response == 'true'){
                   console.log('Operation Completed'); //<== Completed message use it as you want 
                   window.clearInterval(interval);
               }
          }
       });
    },2000);
</script>

Following script will give you a good idea about what you require. I will call function.php every 2 seconds.:

function.php

<?php

   //Do you processing
   $result = 'true';

   echo $result;

 ?>

Upvotes: 1

Vanojx1
Vanojx1

Reputation: 5584

Try this

function check(){
return $.ajax({
    url: 'function.php',
    type:'POST',
    success: function(risp){
        if(!risp){
            check();
        }else{
            alert("finished!!");
        }
    },
    failure: function(jqXHR, textStatus, errorThrown){
        console.log(textStatus);
    }
});
}

check();

Upvotes: 1

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