CODEWITHSUNDEEP
javascriptphpjqueryajax
datether
datether

Reputation: 163

PHP/Ajax /JQuery response not working properly

I have index.php file which is as following :

<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
        <script src="ajax.js"></script>
    </head>
    <body>
        <div id="summary">The returned value will go here</div>
    </body>
</html>

The content of ajax.js which is supposed to keep calling/invoking function.php until function.php returns '1' :

function check(){
    return $.ajax({
        url: 'function.php',
        type:'POST',
        success: function(response){
            if(response == '1'){
                $('#summary').html(response);
            }else{
                check();
            }
        },
        failure: function(jqXHR, textStatus, errorThrown){
            console.log(textStatus);
        }
    });
}

check();

And Finally function.php : 

<?php
  echo "1";
?>

I expected that function.php would only be invoked once since function.php returns "1". However it keeps calling function.php endlessly.

Can someone point me out how to get this working properly?

Upvotes: 0

Views: 474

Answers (1)

Arun P Johny
Arun P Johny

Reputation: 388316

The code looks fine, but 1 probable reason is the response might have leading or trailing spaces.

A solution could be is to trim the response value before comparing it

if (response.trim() == '1') {//use $.trim(response) if wants to support < IE9 or use a [polyfill](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/trim#Polyfill)
    $('#summary').html(response);
} else {
    check();
}

Upvotes: 1

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