You would need to create an error event handler each time you change the
chart type, as you are creating a new object each time and assigning the
new object to the same variable. This would likely be easier to do with a
ChartWrapper object, as you can assign an "error" event handler for the
ChartWrapper.
The ChartWrapper should only load code that isn't already loaded, so if you
preload a package, the ChartWrapper should not reload it.
On Sunday, April 27, 2014 3:36:02 PM UTC-4, cyb wrote:
>
> Hi,
>
> at the moment i use a switch case for changing different charts like this:
>
> var chart=null;
>> switch (chartType) {
>> case 1:
>> chart=new google.visualization.LineChart(id);
>>
>> break;
>> case 2:
>> chart=new google.visualization.ColumnChart(id);
>>
>> break;
>> }
>> chart.draw(...);
>
>
>
> i have only one chart object for all charts, if i add a error listener
> like this :
>
> google.visualization.events.addListener(chart, 'error', function (err)
> {.....});
>
> must i do this for every chart ? i mean an extra listener for the
> LineChart and one for the ColumChart or can i only create one listener with
> the chart object?
>
>
> or is it better to use a chartWrapper ? if i use a chart wrapper i can add
> only this chartwarapper to the error handler !?
>
> and last question.. the chartWrapper loads the charts dynamicly, but if i
> add this in my code "google.load("visualization", "1", {packages:["table",
> "controls", "corechart","geomap","geochart"]});"
> did the charWrapper then load the charts from my HDD(because the charts
> already loaded) or did he trys to load the charts form the internet ?
>
>
>
>
>
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