Saving data to a json file with handsontable

Question

I'm trying to save spreadsheet data to json file. I use the following code. When i run this code nothing happens, and developer web console says 'no element found'. I'm using handsontable 0.29 Please help me with the working code. Your help is much appreciated.

js Code

Handsontable.Dom.addEvent(save, 'click', function() {
    // save all cell's data
    ajax('save.php', 'POST', {data: hot.getData()}, function (res) {
    });
});

save.php

<?php
    $myFile = "save.json";
    $fh = fopen($myFile, 'w');
    $stringData = $_POST["data"];
    fwrite($fh, json_decode($stringData));
    fclose($fh);
?>

Answer 1

js code

Handsontable.Dom.addEvent(save, 'click', function() {

    ajax('save.php', 'POST', 'value='+JSON.stringify({data : hot.getData()}), function (res){
    });
});

save.php

<?php

    $stringData = $_POST["value"];

    $myFile = "general.json";
    $fh = fopen($myFile, 'w') or die("can't open file");

    fwrite($fh, $stringData);
    fclose($fh)
?>

This works perfectly. Hope it would help someone else.