How to print variables which are on the header on javascript?
Question
I have the following code that is not working correctly and I need to check what it is happening. The problem is that most of the code is done on the html header. How can I print the variables in order to check what's wrong?
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Highstock Example</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$.getJSON('http://localhost/teste04.php', function(data) {
// split the data set into ohlc and volume
var ohlc = [],
volume = [],
dataLength = data.length;
for (i = 0; i < dataLength; i++) {
ohlc.push([
data[i][0], // the date
data[i][1], // open
data[i][2], // high
data[i][3], // low
data[i][4] // close
]);
volume.push([
data[i][0], // the date
data[i][5] // the volume
]);
}
// set the allowed units for data grouping
var groupingUnits = [[
'week', // unit name
[1] // allowed multiples
], [
'month',
[1, 2, 3, 4, 6]
]];
// create the chart
chart = new Highcharts.StockChart({
chart: {
renderTo: 'container',
alignTicks: false
},
rangeSelector: {
selected: 1
},
title: {
text: 'AAPL Historical'
},
yAxis: [{
title: {
text: 'OHLC'
},
height: 200,
lineWidth: 2
}, {
title: {
text: 'Volume'
},
top: 300,
height: 100,
offset: 0,
lineWidth: 2
}],
series: [{
type: 'candlestick',
name: 'AAPL',
data: ohlc,
dataGrouping: {
units: groupingUnits
}
}, {
type: 'column',
name: 'Volume',
data: volume,
yAxis: 1,
dataGrouping: {
units: groupingUnits
}
}]
});
});
});
</script>
</head>
<body>
<script src="js/highstock.js"></script>
<script src="js/modules/exporting.js"></script>
<div id="container" style="height: 500px; min-width: 500px"></div>
</body>
</html>
Edit: I would like to print "datalength" for example.
Thanks in advance, Luis
1 answers
solution1
1 ACCPTED 2012-08-14 16:49:49
variables inside the anonymous function you pass as parameter callback to $.getJSON only live inside it's scope.
You can use something like console.log(dataLength) inside that function and its value at that time will show up in the browser's console.
You can use a javascript debugger (firebug in firefox, Javascript Console in Chrome), set up a break point on the first line inside that function and execute it step by step to see the values in each variable.
Chrome, imho, has the best console and debugger, so just try this:
$.getJSON('http://localhost/teste04.php', function(data) {
console.log(data);
// split the data set into ohlc and volume
var ohlc = [],
............
hit F12 on chrome, refresh the page and whatch all the values inside the data object in the console
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