| The extent of the problem
depends entirely on the browser and platform being used; later version
browsers, for example, are doing a much better job of eliminating the
problem then earlier version browsers did.
A possible HM work around for form and other select elements
is to hide the select element completely when the menu pops up, using the
UponDisplay/UponHide parameters. Another technique involves the use
of IFRAME masking, but this technique works only in Internet Explorer
5.5 and 6. Links to further information on the application of both techniques
in HierMenus 6 are presented below.
For a general discussion of the problem, see this page:
http://www.webreference.com/dhtml/diner/seethru/
HierMenus work arounds primarily take one of two possible approaches:
Hide the form elements/applets when the menus are displayed, and restore them
when the menus are hidden. Use an iframe mask between the menus and the element
(this technique works only in Internet Explorer 5.5/6).
Page elements can be hidden by way of the HM_f_ToggleElementList function
included in the HierMenus 6 HM_Loader.js file, used in combination with the
TopUponDisplay, ChildUponDisplay, TopUponHide, and
ChildUponHide parameters. Further information pertaining to each of these
components can be found at these links:
Bulletin 6: HM_f_ToggleElementList
TopUponHide
TopUponDisplay
ChildUponHide
ChildUponDisplay
The Internet Explorer only IFRAME masking technique can be utilized by way of the
HM_f_IEMaskCreate, HM_f_IEMaskToggle, and HM_f_IEMaskMove
methods included in the HM_Loader.js file. Further description of these
functions and how to implement them can be found at these links:
Using the Custom Code in HM_Loader.js
HM_OnMove
HM_OnVisibilityToggle
HM_OnMenuCreated
Finally, for Flash applets in particular, you may also want to have a look at
Macromedia's own documentation on the subject:
http://www.macromedia.com/support/flash/ts/documents/wmode.htm
http://www.macromedia.com/support/flash/ts/documents/flash_top_layer.htm
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