How to use DOM1 (.onclick, .onmousemove) events

• The on() function
• Using the events property
• An example of the tooltip event

Previously, adding custom RGraph events was rather verbose - being modeled on the dom2 method of adding events. Now though you can use the older but more concise dom1 method. You can only add one dom1 event listener (which could do multiple things) but you can add both dom1 and dom2 style event listeners at the same time.

This example uses the draw custom event to add a highlight after-effect to the bars. The code to achieve this is shown below.

<script>
    bar = new RGraph.Bar({
        id: 'cvs',
        data: [[47,75],[32,74],[71,85],[25,19],[23,71],[81,59],[43,130],[23,20]],
        options: {
            colors: ['#494949','#35A0DA'],
            xaxisLabels: ['Alf','Bob','Carry','Dara','Edgar','Fliss','Gary','Harry'],
            yaxisLabelsCount: 3,
            marginLeft: 35,
            textSize: 14
        }
    });
    
    // Use the older DOM1 style of adding an event listener to the draw event
    bar.ondraw = function (obj)
    {
        var len = obj.coords.length;
        
        for (var i=0; i<len; ++i) {
            obj.path(
                'fs rgba(255,255,255,0.15) fr % % % %',
                obj.coords[i][0], obj.coords[i][1], obj.coords[i][2] / 2, obj.coords[i][3]
            );
        }
    }
    
    bar.draw();
</script>

The on() function

Because dom1 events don't work particularly well with chaining there's an on function which helps you to use the dom1 events and chaining. For example:

<script>
    bar = new RGraph.Bar({
        id: 'cvs',
        data: [5,8,9,6,4,5,5],
        options: {
            // ...
        }
    }).on('draw', function (obj)
    {
        // ...
    }).draw()
    
    bar.draw();
</script>

Using the events property

From version 6.22 there's now an events property that you can use to add events to your chart. More on the new events property here. This is an example of the tooltip event that you can use to create charts in tooltips.

<script>
    line = new RGraph.Line({
        id: 'cvs',
        data: [14,16,13,15,5,8,9,12],
        options: {
            labels: ['Luis','Kev','Jim','Harry','Hoolio','liss','Rhonda','Fred'],
            tooltips: '<canvas id="tooltip_canvas" width="300" height="100"></canvas>',
            tooltipsCss: {
                backgroundColor: 'white',
                color: 'black'
            },
            marginInner: 5,
            tickmarksStyle: 'endcircle',
            tickmarksSize: 7,
            textSize: 14,
            spline: true,
            events: {
                tooltip: function (obj)
                {
                    // This is the data for the tooltip bar chart
                    var tooltip_data = [[4,4,6],[4,7,5],[10,1,2],[5,5,5],[1,2,2],[4,2,2],[2,4,3],[6,4,2]];
                
                    // Get the visible tooltip
                    var tooltip = RGraph.Registry.get('tooltip');
                    var index   = tooltip.__index__;
                    
                    var bar = new RGraph.Bar({
                        id: 'tooltip_canvas',
                        data: tooltip_data[index],
                        options: {
                            marginLeft: 17,
                            marginRight: 5,
                            marginTop: 15,
                            xaxisLabels: ['Monday','Tuesday','Wednesday'],
                            backgroundGrid: false,
                            labelsAbovebar: true
                        }
                    }).draw();
                }
            }
        }
    }).draw();
</script>