JavaScript和JSON

Question

I am new to JS & JSON.I am struggle with converting JSON array to JavaScript array.How to do that? Here is my code:

var data = {
items: [
<? $i=1; foreach($query->result() as $row){ ?>
<? if($i!=1){ ?>,<? } ?>
{label: '<?=$row->district_name;?>', data: <?=$row->countid;?>}
<? $i++; } ?>
]
};

how to get the JSON array value to JavaScript Array. i just tried but it doesn't work. please some suggestions. here is my javascript array

for(i=0;i<5;i++){
chartData[i]=data.items[i].label+";"+data.items[i].data;

}

Answer 1

As the others already said, be careful when talking about JavaScript and JSON. You actually want to create a JavaScript object and not JSON.

Don't mix PHP and JavaScript like this. It is horrible to maintain. Create an array beforehand, encode it as JSON^* and print it:

<?php

    $results = $query->result(); // get results

    function m($v) { // a helper function for `array_map`
        return array('label' => $v->district_name, 
                     'data' => $v->countid);
    }

    $data = array('items' => array_map('m', $results));

?>

var data = <?php echo json_encode($data); ?>

---

*: Here we use the fact that a JSON string is valid JavaScript too. You can just echo it directly in the JavaScript source code. When the JS code runs, it is not JSON, it is interpreted as JavaScript object.