A basic example of AJAX and CSV data

This is a basic example of using CSV and AJAX. AJAX is used to request the data and it is returned in CSV format. The JSON data is then evaluated and a chart created using it.

Note: In October 2013 a new CSV reader was added to RGraph. It makes reading CSV files much easier. You can read about the new CSV reader here.

This goes in the documents header:

<script src="RGraph.common.core.js"></script>
<script src="RGraph.line.js"></script>

Put this where you want the chart to show up:

<canvas id="cvs" width="600" height="250">
    [No canvas support]
</canvas>

This is the code that generates the chart:

<script>
    /**
    * Ths window.onload function initiates the AJAX request. The AJAX page is: http://www.rgraph.net/getdata.html
    * If you view this in your browser you'll see that all it does is output a sequence of numbers.
    */
    window.onload = function ()
    {
        RGraph.AJAX.getCSV('/getdata.html', drawGraph);
    };



    /**
    * This is the AJAX callback function. The AJAX getCSV() converts the strings to numbers for you.
    */
    function drawGraph (csv)
    {
        // Now draw the chart
        var line = new RGraph.Line({
            id: 'cvs',
            data: csv,
            options: {
                textAccessible: true,
                hmargin: 0,
                linewidth: 2,
                ymax: 100,
                numxticks: 9,
                    gutterLeft: 35,
                labels: ['Gary','Rachel','Neil','Martha','Kevin','Craig','John','Peter','Luis','Bert']
            }
        }).draw()
    }
</script>