问题
I was trying to print an ExtJs grid and found rahul singla post:
http://www.rahulsingla.com/blog/2010/10/extjs-printing-gridpanels-with-groupingview-and-groupsummary-plugin
which led me to Ed Spencer Printer class, wich led me to Loaine's ExtJs4 version
https://github.com/loiane/extjs4-ux-gridprinter
which is absolutely great, so far so good, but the grid I'm trying to print has a multilevel groupingsummary feature for wich I used this UX
http://www.sencha.com/forum/showthread.php?265814-Multi-level-grouping-summary-and-grand-totals-for-Ext-JS-4.2
Problems are:
1.- While this grid does get printed it doesn't recognize the grouping feature.
2.- The second time the grid with the multilevel groupingsummary feature is rendered or tried to be rendered I get "TypeError: oldGroupCache is null"
I know this stuff is too specific but hopefully somebody else is trying to acomplish the same.
Any help would be appreciated.
(I'm using ExtJs 4.2.1 and can't go to a newer version because of my work)
来源：https://stackoverflow.com/questions/20172003/extjs4-multilevelgrouping-grid-and-being-able-to-print-it