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HM_OnMenuOver

Description:

The custom (user defined) method that is called when the user rolls their mouse over a menu.

Value:

JavaScript function.

Applies To:

Menus.

Browser Compatibility:

HM_OnMenuOver is supported in all browsers.

Parameters:

(menuEl)

menuEl is the HTML element for the menu

Comments:

HM_OnMenuOver is a HierMenus Menu Event Hook; a means for you to execute your own custom JavaScript code from within normal HierMenus processing. All menu event hooks expect to be set to the name of a custom function (typically of your own creation, although the HM_Loader.js file contains some custom functions designed for use with event hooks), a function literal, or a dynamically generated function.

The function you create for use with this menu event hook should be designed as a method of the menu object, i.e., the internal menu object that HierMenus creates to track the various unique parameters of the menu itself. Thus, the this keyword, within the context of your custom function, refers directly to the menu object.

The menu object (referred to by this) is not the same as the menu element. The menu object is the internal structure that HierMenus uses to track various pieces of information specific to this menu. The menu element is the actual HTML page element that represents the menu itself. You access the menu object via the this keyword within your custom method; you access the menu element via the first parameter passed to the function.

When using HM_OnMenuOver note that it is not guaranteed that the action that is being called for is strictly necessary on the menu. Most browsers will refire the mouseover event on an element repeatedly as the mouse rolls over elements that are themselves contained within the target element. HierMenus attempts to avoid this behavior (i.e., HierMenus attempts to call the mouseover handler for the menu only once, when the mouse initally enters the menu element) but this behavior cannot be relied upon for all browsers. Your methods will need to be designed with this fact in mind.

For further usage and implementation information, see the mini-tutorial Menu Event Hooks.

Example Method:

// write a message to the status 
// bar when the user is over a menu
function HM_fc_MenuOver() {
   window.status="Welcome to menu "+this.MenuID+"!";
}

Example Settings:

// Ok:
HM_OnMenuOver:HM_fc_MenuOver,
HM_OnMenuOver:null,  // remove hook for this menu

// Incorrect:
HM_OnMenuOver:"HM_fc_MenuOver",
   // do not quote function names here
HM_OnMenuOver:"null", 
   // do not quote null here

Default:

null

See Also:

HM_OnMove, HM_OnVisibilityToggle, HM_OnCreateMenu, HM_OnMenuCreated, HM_OnItemHilite, HM_OnBuildMenus, HM_OnItemClick, HM_OnItemHover, HM_OnCreateItem, HM_OnItemCreated, HM_OnMenuOut, HM_OnItemOver, HM_OnItemOut, HM_OnLink, setTrans, killTrans, Menu Event Hooks Mini-Tutorial