Problem with getChartFromId in hidden DHTML block for Firefox

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I have an interesting problem with a site I'm developing.




I have a page with several tables of data and a chart. I have the tables and chart each displayed in their own div blocks, which are hidden when not displayed, and then I use javaScript to switch between them without reloading the page - eg:









I have some select boxes on the chart page which change the data displayed on the chart using




var chartObj = getChartFromId("FundChart");

var chartUrl = '{new chart URL here}'

chartUrl = escape(chartUrl);





... this works fine.




Now when you view the other data in the tables, it hides the chart, and I have some links in the tables which use javascript to show the chart and load a new URL for the chart data using exactly the same code as above.




This works fine in IE - but in Firefox, I get a JavaScript error - "Error: chartObj.setDataURL is not a function". It works fine in Firefox if I don't have the chart div hidden - so I think it might be something about Firefox not allowing the getChartFromId to work for hidden objects ??




For reference - here is how I render the chart (PHP):




require_once(DIR . '/includes/FusionCharts.php');

$url = urlencode({chart URL here});

$fundchart = renderChart("/charts/MSLine.swf", $url, "", "FundChart", $width, $height, false, true);




Any suggestions ?

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When you hide a chart contained in a DIV and then show it back, the browsers actually need to reload the chart SWF. They do not perform simple show/hide.

As such, when you call setDataURL method again, the chart has not yet loaded and exposed its API to browser. As such, you'll need to track FC_Rendered event again, before calling the setDataURL method.

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