This example creates context menu for an HTML table and illustrates how the content of a ContextMenu instance can be replaced on the fly based on the element that triggered its display.
Please Note: Opera users will need to do the following to use this example:
When adding context menus to large data structures like a
<table> or large list (
<ul>), it is recommended to bind a single
YAHOO.widget.ContextMenu instance to the structure's root element, than to each of its
child nodes (
Doing so significantly improves the performance of a web page or
application by reducing the number of "contextmenu" event handlers
as well as the number of YAHOO.widget.ContextMenu instances in memory.
Begin by creating an
<table> and giving
<tr> elements that should have the same context menu a
similar class name.
Next, use the
method of the Event utility to listen for when the
element is are ready to be scripted.
Inside the function passed to the Event Utility's
onContentReady method, create a
shortcut to the Dom Utility (since it will be used frequently) and an object literal that maps each
class name to a set of MenuItem configuration properties.
Lastly, add a "beforeShow" event handler to the ContextMenu instance.
This event handler makes use of the "contextEventTarget" property to determine
<tr> element was the target of the "contextmenu"
event. Once found, the
<tr> element's class name is
used to look up its corresponding menu items in the "oContextMenuItems"
map, which are then added to the ContextMenu instance via the "addItems" method.