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jqPlotでブラウザが落ちる場合の対応

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jqPlotでグラフを描画しています。
セレクトボックスの値が切り替わったら、グラフを再描画しています。
セレクトボックスを数回変更したら、ブラウザが落ちてしまいました。

原因はメモリリークのようで、destroyメソッドを実行したら解決しました。

コード

document.getElementById("selectbox").onchange = drawChart;

function drawChart() {
 //グラフ描画処理
 $.jqPlot("chartArea", ...);
};
var chartObject; //グラフオブジェクト(グローバル変数)
document.getElementById("selectbox").onchange = drawChart;

function drawChart() {
 if (chartObject != null) {
   chartObject.destroy();
 }
 //グラフ描画処理
 chartObject = $.jqPlot("chartArea", ...);
};

参考サイト

http://www.jqplot.com/docs/files/jqplot-core-js.html#jqPlot.destroy
http://stackoverflow.com/questions/6380016/what-to-do-with-jqplot-memory-leak

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