Question

I’m using JQuery to call a PHP function that returns a JSON string upon success or throws some exceptions. Currently I’m calling jQuery.parseJSON() on the response and if it fails I assume the response contains an exception string.

$.ajax({
            type: "POST",
            url: "something.php",
            success: function(response){
                 try {
                     var json = jQuery.parseJSON(response);
                 }
                catch (e) {
                    alert(response);
                    return -1;
                 }
                 // ... do stuff with json
            }

Can anyone suggest a more elegant way to catch the exception?

Many thanks,
Itamar

Answer 1

Well, you can have a global exception handler in PHP that would call json_encode on it then echo it out.

<?php
    function handleException( $e ) {
       echo json_encode( $e );
    }
    set_exception_handler( 'handleException' );
?>

You could then check if, say, json.Exception != undefined.

$.ajax({
            type: "POST",
            url: "something.php",
            success: function(response){
                 var json = jQuery.parseJSON( response );
                 if( json.Exception != undefined ) {
                    //handle exception...
                 }
                 // ... do stuff with json
            }