javascript - How to show/Hide ALL column in grid? -

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i have grid have header "show all" shows columns , "hide all" hides except default first column. here's code hide 1 of column header name, how go hiding @ same time?

var grid = ext.componentquery.query('grid[itemid=gridid]')[0]; var column = grid.getcolumnmanager();                                   column.getheaderbydataindex("columndataindexname").setvisible("true/false"); 

ext.array.each(grid.getcolumns(), function(column, index) {         if (index > 0) {             column.setvisible(false);         }     }, this);

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