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    <title>A basic example of AJAX</title>

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    <meta name="description" content=" A basic example of a chart created using AJAX. It shows a simple example and there is little happening on the page so the source is easy to navigate." />
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    <h1>A basic example of AJAX</h1>
    
    <p>
        This is a basic example of using AJAX to request the data from the server. The window.onload function initiates the AJAX request
        and then the callback function - DrawGraph() - takes the response and creates the chart.
    </p>

    <canvas id="cvs" width="600" height="250">[No canvas support]</canvas><br />
    
    <button onclick="RGraph.AJAX('/getdata.html', DrawGraph)">Rfresh data</button>

    <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('/getdata.html', DrawGraph);
        };



        /**
        * This is the AJAX callback function. It splits up the response, converts it to numbers and then creates the chart.
        */
        function DrawGraph (response)
        {
            // The responseText is the output of the AJAX request
            var data = response;

            // Split the data up into an array
            data = data.split(',');

            // Convert the array of strings into an array of numbers
            for (var i=0; i<data.length; ++i) {
                data[i] = Number(data[i]);
            }
            
            // Reset the canvas
            RGraph.Reset(document.getElementById("cvs"));

            // Now draw the chart
            var line = new RGraph.Line({
                id: 'cvs',
                data: data,
                options: {
                    textAccessible: true,
                    hmargin: 10,
                    linewidth: 2,
                    ymax: 100,
                    gutterLeft: 35,
                    labels: ['Gary','Olga','Lewis','Rachel','Nathan','Matt','Kevin','Indigo','Lou','Pete']
                }
            }).draw()
        }
    </script>

    <p>
        <b>Note:</b>
        In October 2013 a new CSV reader was added to RGraph. It makes reading CSV files much easier. You can read about
        <a href="/docs/csv-file-reader.html">the new CSV reader</a> here.
    </p>







    <p></p>

    This goes in the documents header:
    <pre class="code">
&lt;script src="RGraph.common.core.js"&gt;&lt;/script&gt;
&lt;script src="RGraph.line.js"&gt;&lt;/script&gt;
</pre>
    
    Put this where you want the chart to show up:
    <pre class="code">
&lt;canvas id="cvs" width="600" height="250"&gt;
    [No canvas support]
&lt;/canvas&gt;
</pre>

    This is the code that generates the chart:
    <pre class="code">
&lt;script&gt;
    /**
    * 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('/getdata.html', DrawGraph);
    };



    <span>/**
    * This is the AJAX callback function. It splits up the response, converts it to numbers and then creates the chart.
    */</span>
    function DrawGraph (response)
    {
        <span>// The responseText is the output of the AJAX request</span>
        var data = response;

        <span>// Split the data up into an array</span>
        data = data.split(',');

        <span>// Convert the array of strings into an array of numbers</span>
        for (var i=0; i&lt;data.length; ++i) {
            data[i] = Number(data[i]);
        }
        
        <span>// Reset the canvas</span>
        RGraph.Reset(document.getElementById("cvs"));

        <span>// Now draw the chart</span>
        var line = new RGraph.Line({
            id: 'cvs',
            data: data,
            options: {
                textAccessible: true,
                hmargin: 10,
                linewidth: 2,
                ymax: 100,
                labels: ['Gary','Olga','Lewis','Rachel','Nathan','Matt','Kevin','Indigo','Lou','Pete']
            }
        }).draw()
    }
&lt;/script&gt;
</pre>


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