Expand All / Collapse All panes in Ajax Accordion Extender
There is no direct way to Expand/Collapse all panes in Accordion Extender. Using following java script, Accordion can be Expand/Collapse all panes in one click. Expand All : var behavior = $get("<%=accMain.ClientID%>").AccordionBehavior; for (var i = 0; i < behavior._panes.length; i++) { behavior.get_Pane(i).content.style.display = 'block'; behavior.get_Pane(i).content.height = behavior.get_Pane(i).content.scrollHeight; behavior.get_Pane(i).content.style.height = behavior.get_Pane(i).content.scrollHeight + 'px'; } Collapse All : var behavior = $get("<%=accMain.ClientID%>").AccordionBehavior; for (var i = 0; i < behavior._panes.length; i++) { behavior.get_Pane(i).content.style.display = 'none'; behavior.get_Pane(i).content.height = 0; behavior.get_Pane