I'm happy that you found a solution. It is not clear what causes the error but it is possible it is somehow related to the frame the chart is building for its drawing.
Hopefully we would be able to solve it in the future but for now it seems you have a workaround. Best, Viz Kid On Wed, Sep 15, 2010 at 5:09 PM, Josh <[email protected]> wrote: > Hmm... one more detail. Going off Viz Kid's thought that this was a > race condition, if I just insert a delay before drawing the chart, > things seem to work fine. I changed my onLoadCallback to: > > google.setOnLoadCallback(setTimeout('drawChart()', 10)); > > and no longer see the problem. Is it possible that there is a timing > issue with the google.load function? > > Josh > > On Sep 15, 10:16 am, Josh Ain <[email protected]> wrote: > > Viz Kid, > > > > Thank you for your response. I can't (thus far) reproduce the issue on > > a simpler page. Even on this page, if I load different data, the issue > > usually does not occur. The issue does consistently occur with any > > data in this set of data, and four other sets of data (that do not > > have any discernible similarities that I can see). > > > > I am only loading the visualization api once on the page. I thought > > that the issue might be a race condition, but I have debugged through > > the js code (which should slow down any execution) and the issue still > > consistently occurs. > > > > Any other thoughts? > > > > Josh Ain > > > > On Wed, Sep 15, 2010 at 10:09 AM, Viz Kid <[email protected]> wrote: > > > > > Can you possibly give a simpler example page where this happens? > > > Your current page is very complex and it would be impossible to follow. > > > In general, such errors might be result of race conditions when you > load > > > several things. Maybe you can load the visualization API only once > instead > > > of each operation? > > > Best, > > > Viz Kid > > > > > On Tue, Sep 14, 2010 at 11:58 PM, Josh <[email protected]> wrote: > > > > >> Oh, and I think I used the wrong url for a reproducer. Here are more > > >> details on reproducing the issue. In chrome, goto > > > > >> > https://pub.needlebase.com/actions/visualizer/V2Visualizer.do?domain=...&typeId=9149585060559937610&render=Chart&chartSort=&selectedChart=LineChart&colIds=9149585060559937628&startPage=1&actionType=&targetParam=&messageJsp=&query=&queryDescription=&folder=&advQuery=&showCheckboxes=false&lastQueryName=&defaultTypeQuery=&ownerOnly= > > > > >> Then, in the first select box in the upper left, change the value from > > >> Disaster to _Batch. This will submit a form on the page, reload the > > >> page, and reproduce the issue. > > > > >> Josh > > > > >> On Sep 14, 5:45 pm, Josh <[email protected]> wrote: > > >> > Hello Visualization API group, > > > > >> > I am hitting a very odd error using a couple of very basic core > google > > >> > visualization charts. > > > > >> > Using the area, bar, column or line charts, whenever I reload the > page > > >> > by a form submission (get or post) I get a error message 'cannot > read > > >> > property "document" of null' instead of my expected chart. If I hit > > >> > reload, or go to the page directly from a url, the chart renders > > >> > fine. > > > > >> > My charting code is very simple: > > > > >> > google.load('visualization', '1', > {'packages':['corechart']}); > > >> > google.setOnLoadCallback(drawChart); > > >> > function drawChart() { > > > > >> > var data = new google.visualization.DataTable( > > >> > (my datatable json), > > >> > 0.6 > > >> > ); > > > > >> > var chart = new > > >> > > google.visualization.LineChart(document.getElementById('chart_div1')); > > >> > var params = {(some parameters)}; > > >> > chart.draw(data, params); > > > > >> > I encounter the error right after chart.draw. Even if I delete the > > >> > contents of the parameter array, I still encounter the issue. > > > > >> > This error is not occurring in firefox 3.6.8, and is occurring > > >> > consistently on google chrome 6.0.472.53, both running on Ubuntu. I > > >> > have heard of others encountering the issue on safari, but have not > > >> > confirmed the issue there. > > > > >> > I have a consistent reproducer for chrome here: > > > > >> > > https://pub.needlebase.com/actions/visualizer/V2Visualizer.do?domain=... > > > > >> > (note that in about a week, we may deploy a workaround that simply > > >> > refreshes the page if we encounter an error). > > > > >> > What makes this issue particularly odd, is that it does not always > > >> > occur. We have a number of different 'domains of data'. In the > > >> > Disasters domain that I linked above, the issue consistently occurs > > >> > for anything that we try to chart in that domain. The issue does not > > >> > occur for other domains, even others served by the same machine. > > >> > Several other domains consistently exhibit this behavior with > chrome, > > >> > while most domains do not. > > > > >> > Has anybody encountered this issue before? Searching for the error > > >> > text did not turn up much of use. It appears that we are hitting a > js > > >> > exception deep within the charting code, and falling through to a > > >> > catch block. > > > > >> > Thank you for any assistance. > > > > >> > Josh Ain > > > > >> -- > > >> You received this message because you are subscribed to the Google > Groups > > >> "Google Visualization API" group. > > >> To post to this group, send email to > > >> [email protected]. > > >> To unsubscribe from this group, send email to > > >> [email protected]<google-visualization-api%[email protected]> > . > > >> For more options, visit this group at > > >>http://groups.google.com/group/google-visualization-api?hl=en. > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "Google Visualization API" group. > > > To post to this group, send email to > > > [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<google-visualization-api%[email protected]> > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-visualization-api?hl=en. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Google Visualization API" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-visualization-api%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-visualization-api?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. 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