hmm, third post is the charm, I swear.
You can only create the mousewheel handler after the treemap has been fully
rendered. So the code should be
function drawChart(){
//...
// Create the chart here
// ....
// Add a mousewheel handler when the chart has been drawn
google.visualization.events.addListener(tree, 'ready', function(){
document.getElementById('chart_div').onmousewheel = function(e){
if ("wheelDelta" in e) if (e.wheelDelta<0) return; // Only consider
scrolling in one direction
if (tree) tree.goUpAndDraw();
}
});
} // createChart()
-r
On Friday, June 17, 2011 7:47:16 PM UTC+10, MarkC wrote:
>
> I have set up a treemap, and its working fine on a desktop / laptop.
>
> However, the standard right mouse navigation 'up' the treemap doesn't
> work on an iPad when either double-tapping OR tapping and holding.
>
> Has anyone worked out a way around this?
>
> Thanks
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