If you click an element twice in a row, the second click deselects the
element, thus the selection array is empty. Index 0 of an empty array is
undefined. You should test the length of the array before attempting to
access its contents:
function timeLineSelected(){
var selection = chartTimeLine.getSelection();
if (selection.length) {
alert(selection[0].row);
}
}
On Wednesday, June 18, 2014 2:52:14 PM UTC-4, JProject wrote:
>
> Hello, I want to capture the selected element in my timeline, but
> chart.getSelection () [0]. Returns undefined.
>
> var container = document.getElementById('timeline');
> chartTimeLine = new google.visualization.Timeline(container);
> dataTimeLine = new google.visualization.DataTable();
> dataTimeLine.addColumn({ type: 'string', id: 'President' });
> dataTimeLine.addColumn({ type: 'date', id: 'Start' });
> dataTimeLine.addColumn({ type: 'date', id: 'End' });
>
> dataTimeLine.addRows([
> [ 'Washington', new Date(1789, 3, 29), new Date(1797, 2, 3) ],
> [ 'Jefferson', new Date(1801, 2, 3), new Date(1809, 2, 3) ]]);
> chartTimeLine.draw(dataTimeLine);
> google.visualization.events.addListener(chartTimeLine, 'select',
> timeLineSelected);
>
> function timeLineSelected(){
> alert(chartTimeLine.getSelection()[0].row);
> }
>
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