Question

i have a ajax that needs to return some values, but if i use a while() to get all the result from my db, the return is “nothing”.

js:

$.post("ajax/file.ajax.php", 
  { 
    cache: false
  }, 
  function(data){ 
    alert(data.region);
  },'json'
);

php:

while(!$res->EOF)
    {
        header('Content-Type: application/json');
        $return_data = array('value'=>''.$res->fields['VALUE'].'','region'=>''.$res->fields['REGION'].'');
        echo json_encode($return_data);

        $res->MoveNext();
    }

so, how can i use the while with json ?

Answer 1

The easiest solution would be to create an array and then array.push the row you are generating onto the end of it.

For example:

PHP

$array = array();

while(!$res->EOF) {
    $dataFromDB = array('value'=>''.$res->fields['VALUE'].'','region'=>''.$res->fields['REGION'].'');
    $array[] = $dataFromDB; //or array_push($array, $dataFromDB); 

    $res->MoveNext();
}

header('Content-Type: application/json');
echo json_encode($array);

JS:

$.post("ajax/file.ajax.php", 
  { 
    cache: false
  }, 
  function(data){ 
    for(n in data) {
        alert(data[n].region);
    }
  },'json'
);

Then output the json encoded array to finish.

You should also move your header out of the while loop and put it just before you echo the new array.