JSON and PHP issues - php

Question

I'm new to JSON and AJAX, and as such have searched for solutions and experimented for a few days before resorting to asking here.
I am using AJAX to process a PHP page on submit. It is saving the information fine, but I also need the PHP page to pass back the inserted ID. Here is what I have so far.
In the success:
success: function(){
$('#popup_name img').remove();
$('#popup_name').html('Saved');
$('#fade , .popup_block').delay(2000).fadeOut(function() {
$('#fade, a.close').remove(); //fade them both out
$.getJSON(pathName, function(json){
alert('You are here');
alert("Json ID: " + json.id);
});
});
}
Then, the PHP script calls this method to insert the info and return the inserted id:
public static function doInsertQuery($sparamQuery="",$bparamAutoIncrement=true,$sparamDb="",$sparamTable=""){
//do the insert
$iReturn = 0;
$result = DbUtil::doQuery($sparamQuery);
if(!$result){
$iReturn = 0;
}
elseif(!$bparamAutoIncrement){
$iReturn = DbUtil::getInsertedId();
}
else{
$iReturn = DbUtil::getInsertedId();
}
//log the insert action
//if not a client logged in- cannot log to client db
if(Session::get_CurrentClientId() > 0){
if($sparamTable != LogLogin::table_LOGLOGINS()){
$oLog = new LogDbRequest();
$oLog->set_Type(LogDbRequest::enumTypeInsert);
$oLog->set_Request($sparamQuery);
$oLog->set_RowId($iReturn);
$oLog->set_TableName($sparamTable);
$oLog->set_Before("NULL");
$oLog->set_After(serialize(DbUtil::getRowCurrentValue($sparamDb,$sparamTable)));
$oLog->insertorupdate_LogDbRequest();
}
}
echo json_encode($iReturn);
return $iReturn;
}
I hope this makes sense. I'm at a complete loss here. Any help at all would be greatly appreciated!
~Mike~

Answer 1

It's simple really. The success function accepts an argument corresponding to the response from the server.
Client side:
$.ajax({
'url':'/path/to/script.php',
'dataType':'json',
'success':function(response){ //note the response argument
alert(response.id); //will alert the id
}
});
Server side:
<?php
//...previous stuff here...
$response = array('id' => $id); //where $id is the id to return to the client
header('Content-type: application/json'); //Set the right content-type header
echo json_encode($response); //Output array as JSON
?>