![]() That’s the element that we are coming from/to, complementary to target.I have a little div tag that when I click on it ( onClick event), it will run the printMousePos() function. Events mouseover/out and mouseenter/leave have an additional property: relatedTarget.A fast mouse move may skip intermediate elements.We covered events mouseover, mouseout, mousemove, mouseenter and mouseleave. Only as a whole is highlighted, unlike the example before. Try to move the cursor in and out of table cells and inside them. any functions to handle entering/leaving an element RelatedTarget = relatedTarget.parentNode then that's an internal transition – ignore it go up the parent chain and check – if we're still inside currentElem we're leaving the element – where to? Maybe to a descendant? that's probably a move inside the table, but out of , if we're outside of any now, then ignore the event moved into, but outside of our table (possible in case of nested tables) ![]() that's a mouseover inside it, ignore the event if currentElem is set, we didn't leave the previous , before entering a new element, the mouse always leaves the previous one Here’s an example of code that accounts for all possible situations: On mouseout – ignore if we didn’t leave the current.On mouseover – ignore the event if we’re still inside the current.Remember the currently highlighted in a variable, let’s call it currentElem.Other transitions, such as inside the cell or outside of any cells, don’t interest us. In our case we’d like to handle transitions between table cells : entering a cell and leaving it. Let’s start with simple handlers that highlight the element under mouse:īagua Chart: Direction, Element, Color, Meaning It’s impossible to get any information about transitions inside it. Handlers for mouseenter/leave on only trigger when the pointer enters/leaves the table as a whole. So if such event happens on, then only a handler on that is able to catch it. The natural solution would be – to set the handler on and process events there. Imagine we want to handle mouse enter/leave for table cells. So we can’t use event delegation with them. Transitions between descendants are ignoredĮvents mouseenter/leave are very simple and easy to use. Nothing happens when the pointer goes to the child and back. This example is similar to the one above, but now the top element has mouseenter/mouseleave instead of mouseover/mouseout.Īs you can see, the only generated events are the ones related to moving the pointer in and out of the top element. When the pointer leaves an element – mouseleave triggers. The exact location of the pointer inside the element or its descendants doesn’t matter. When the pointer enters an element – mouseenter triggers. Events mouseenter/mouseleave do not bubble.Transitions inside the element, to/from descendants, are not counted.They trigger when the mouse pointer enters/leaves the element. Events mouseenter and mouseleaveĮvents mouseenter/mouseleave are like mouseover/mouseout. ![]() To avoid it, we can check relatedTarget in the handler and, if the mouse is still inside the element, then ignore such event.Īlternatively we can use other events: mouseenter and mouseleave, that we’ll be covering now, as they don’t have such problems. an animation runs in parent.onmouseout, we usually don’t want it when the pointer just goes deeper into #parent. ![]() If there are some actions upon leaving the parent element, e.g. If we don’t examine event.target inside the handlers, then it may seem that the mouse pointer left #parent element, and then immediately came back over it.īut that’s not the case! The pointer is still over the parent, it just moved deeper into the child element. * event.target: child element (bubbled) */ ![]()
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