问题
I am having trouble with the onmouseout function in an absolute positoned div. When the mouse hits a child element in the div, the mouseout event fires, but I do not want it to fire until the mouse is out of the parent, absolute div.
How can I prevent the mouseout event from firing when it hits a child element WITHOUT jquery.
I know this has something to do with event bubbling, but I am having no luck on finding out how to work this out.
I found a similar post here: How to disable mouseout events triggered by child elements?
However that solution uses jQuery.
回答1:
function onMouseOut(event) {
//this is the original element the event handler was assigned to
var e = event.toElement || event.relatedTarget;
if (e.parentNode == this || e == this) {
return;
}
alert('MouseOut');
// handle mouse event here!
}
document.getElementById('parent').addEventListener('mouseout',onMouseOut,true);
I made a quick JsFiddle demo, with all the CSS and HTML needed, check it out...
EDIT FIXED link for cross-browser support http://jsfiddle.net/RH3tA/9/
NOTE that this only checks the immediate parent, if the parent div had nested children then you have to somehow traverse through the elements parents looking for the "Orginal element"
EDIT example for nested children
EDIT Fixed for hopefully cross-browser
function makeMouseOutFn(elem){
var list = traverseChildren(elem);
return function onMouseOut(event) {
var e = event.toElement || event.relatedTarget;
if (!!~list.indexOf(e)) {
return;
}
alert('MouseOut');
// handle mouse event here!
};
}
//using closure to cache all child elements
var parent = document.getElementById("parent");
parent.addEventListener('mouseout',makeMouseOutFn(parent),true);
//quick and dirty DFS children traversal,
function traverseChildren(elem){
var children = [];
var q = [];
q.push(elem);
while (q.length > 0) {
var elem = q.pop();
children.push(elem);
pushAll(elem.children);
}
function pushAll(elemArray){
for(var i=0; i < elemArray.length; i++) {
q.push(elemArray[i]);
}
}
return children;
}
And a new JSFiddle, EDIT updated link
回答2:
Use onmouseleave.
Or, in jQuery, use mouseleave()
It is the exact thing you are looking for. Example:
<div class="outer" onmouseleave="yourFunction()">
<div class="inner">
</div>
</div>
or, in jQuery:
$(".outer").mouseleave(function(){
//your code here
});
an example is here.
回答3:
For a simpler pure CSS solution that works in some cases (IE11 or newer), one could remove children's pointer-events by setting them to none
.parent * {
pointer-events: none;
}
回答4:
Here's a more elegant solution based on what came below. it accounts for event bubbling up from more than one level of children. It also accounts for cross-browser issues.
function onMouseOut(this, event) {
//this is the original element the event handler was assigned to
var e = event.toElement || event.relatedTarget;
//check for all children levels (checking from bottom up)
while(e && e.parentNode && e.parentNode != window) {
if (e.parentNode == this|| e == this) {
if(e.preventDefault) e.preventDefault();
return false;
}
e = e.parentNode;
}
//Do something u need here
}
document.getElementById('parent').addEventListener('mouseout',onMouseOut,true);
回答5:
Thanks to Amjad Masad that inspired me.
I've the following solution which seems to work in IE9, FF and Chrome and the code is quite short (without the complex closure and transverse child things) :
DIV.onmouseout=function(e){
// check and loop relatedTarget.parentNode
// ignore event triggered mouse overing any child element or leaving itself
var obj=e.relatedTarget;
while(obj!=null){
if(obj==this){
return;
}
obj=obj.parentNode;
}
// now perform the actual action you want to do only when mouse is leaving the DIV
}
回答6:
If you're using jQuery you can also use the "mouseleave" function, which deals with all of this for you.
$('#thetargetdiv').mouseenter(do_something);
$('#thetargetdiv').mouseleave(do_something_else);
do_something will fire when the mouse enters thetargetdiv or any of its children, do_something_else will only fire when the mouse leaves thetargetdiv and any of its children.
回答7:
Try mouseleave()
Example :
<div id="parent" mouseleave="function">
<div id="child">
</div>
</div>
;)
回答8:
instead of onmouseout use onmouseleave.
You haven't showed to us your specific code so I cannot show you on your specific example how to do it.
But it is very simple: just replace onmouseout with onmouseleave.
That's all :) So, simple :)
If not sure how to do it, see explanation on:
https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onmousemove_leave_out
Peace of cake :) Enjoy it :)
回答9:
I think Quirksmode has all the answers you need (different browsers bubbling behaviour and the mouseenter/mouseleave events), but I think the most common conclusion to that event bubbling mess is the use of a framework like JQuery or Mootools (which has the mouseenter and mouseleave events, which are exactly what you intuited would happen).
Have a look at how they do it, if you want, do it yourself
or you can create your custom "lean mean" version of Mootools with just the event part (and its dependencies).
回答10:
I've found a very simple solution,
just use the onmouseleave="myfunc()" event than the onmousout="myfunc()" event
In my code it worked!!
Example:
<html>
<head>
<script type="text/javascript">
function myFunc(){
document.getElementById('hide_div').style.display = 'none';
}
function ShowFunc(){
document.getElementById('hide_div').style.display = 'block';
}
</script>
</head>
<body>
<div onmouseleave="myFunc()" style='border:double;width:50%;height:50%;position:absolute;top:25%;left:25%;'>
Hover mouse here
<div id='child_div' style='border:solid;width:25%;height:25%;position:absolute;top:10%;left:10%;'>
CHILD <br/> It doesn't fires if you hover mouse over this child_div
</div>
</div>
<div id="hide_div" >TEXT</div>
<a href='#' onclick="ShowFunc()">Show "TEXT"</a>
</body>
</html>
Same Example with mouseout function:
<html>
<head>
<script type="text/javascript">
function myFunc(){
document.getElementById('hide_div').style.display = 'none';
}
function ShowFunc(){
document.getElementById('hide_div').style.display = 'block';
}
</script>
</head>
<body>
<div onmouseout="myFunc()" style='border:double;width:50%;height:50%;position:absolute;top:25%;left:25%;'>
Hover mouse here
<div id='child_div' style='border:solid;width:25%;height:25%;position:absolute;top:10%;left:10%;'>
CHILD <br/> It fires if you hover mouse over this child_div
</div>
</div>
<div id="hide_div">TEXT</div>
<a href='#' onclick="ShowFunc()">Show "TEXT"</a>
</body>
</html>
Hope it helps :)
回答11:
Although the solution you referred to uses jquery, mouseenter and mouseleave are native dom events, so you might use without jquery.
回答12:
There are two ways to handle this.
1) Check the event.target result in your callback to see if it matches your parent div
var g_ParentDiv;
function OnMouseOut(event) {
if (event.target != g_ParentDiv) {
return;
}
// handle mouse event here!
};
window.onload = function() {
g_ParentDiv = document.getElementById("parentdiv");
g_ParentDiv.onmouseout = OnMouseOut;
};
<div id="parentdiv">
<img src="childimage.jpg" id="childimg" />
</div>
2) Or use event capturing and call event.stopPropagation in the callback function
var g_ParentDiv;
function OnMouseOut(event) {
event.stopPropagation(); // don't let the event recurse into children
// handle mouse event here!
};
window.onload = function() {
g_ParentDiv = document.getElementById("parentdiv");
g_ParentDiv.addEventListener("mouseout", OnMouseOut, true); // pass true to enable event capturing so parent gets event callback before children
};
<div id="parentdiv">
<img src="childimage.jpg" id="childimg" />
</div>
回答13:
I make it work like a charm with this:
function HideLayer(theEvent){
var MyDiv=document.getElementById('MyDiv');
if(MyDiv==(!theEvent?window.event:theEvent.target)){
MyDiv.style.display='none';
}
}
Ah, and MyDiv tag is like this:
<div id="MyDiv" onmouseout="JavaScript: HideLayer(event);">
<!-- Here whatever divs, inputs, links, images, anything you want... -->
<div>
This way, when onmouseout goes to a child, grand-child, etc... the style.display='none' is not executed; but when onmouseout goes out of MyDiv it runs.
So no need to stop propagation, use timers, etc...
Thanks for examples, i could make this code from them.
Hope this helps someone.
Also can be improved like this:
function HideLayer(theLayer,theEvent){
if(theLayer==(!theEvent?window.event:theEvent.target)){
theLayer.style.display='none';
}
}
And then the DIVs tags like this:
<div onmouseout="JavaScript: HideLayer(this,event);">
<!-- Here whatever divs, inputs, links, images, anything you want... -->
<div>
So more general, not only for one div and no need to add id="..." on each layer.
回答14:
If you have access to the element which the event is attached to inside the mouseout method, you can use contains() to see if the event.relatedTarget is a child element or not.
As event.relatedTarget is the element to which the mouse has passed into, if it isn't a child element, you have moused out of the element.
div.onmouseout = function (event) {
if (!div.contains(event.relatedTarget)) {
// moused out of div
}
}
回答15:
On Angular 5, 6 and 7
<div (mouseout)="onMouseOut($event)"
(mouseenter)="onMouseEnter($event)"></div>
Then on
import {Component,Renderer2} from '@angular/core';
...
@Component({
selector: 'app-test',
templateUrl: './test.component.html',
styleUrls: ['./test.component.scss']
})
export class TestComponent implements OnInit, OnDestroy {
...
public targetElement: HTMLElement;
constructor(private _renderer: Renderer2) {
}
ngOnInit(): void {
}
ngOnDestroy(): void {
//Maybe reset the targetElement
}
public onMouseEnter(event): void {
this.targetElement = event.target || event.srcElement;
console.log('Mouse Enter', this.targetElement);
}
public onMouseOut(event): void {
const elementRelated = event.toElement || event.relatedTarget;
if (this.targetElement.contains(elementRelated)) {
return;
}
console.log('Mouse Out');
}
}
回答16:
I check the original element's offset to get the page coordinates of the element's bounds, then make sure the mouseout action is only triggered when the mouseout is out of those bounds. Dirty but it works.
$(el).live('mouseout', function(event){
while(checkPosition(this, event)){
console.log("mouseovering including children")
}
console.log("moused out of the whole")
})
var checkPosition = function(el, event){
var position = $(el).offset()
var height = $(el).height()
var width = $(el).width()
if (event.pageY > position.top
|| event.pageY < (position.top + height)
|| event.pageX > position.left
|| event.pageX < (position.left + width)){
return true
}
}
回答17:
var elem = $('#some-id');
elem.mouseover(function () {
// Some code here
}).mouseout(function (event) {
var e = event.toElement || event.relatedTarget;
if (elem.has(e).length > 0) return;
// Some code here
});
回答18:
If you added (or have) a CSS class or id to the parent element, then you can do something like this:
<div id="parent">
<div>
</div>
</div>
JavaScript:
document.getElementById("parent").onmouseout = function(e) {
e = e ? e : window.event //For IE
if(e.target.id == "parent") {
//Do your stuff
}
}
So stuff only gets executed when the event is on the parent div.
回答19:
I just wanted to share something with you.
I got some hard time with ng-mouseenter and ng-mouseleave events.
The case study:
I created a floating navigation menu which is toggle when the cursor is over an icon.
This menu was on top of each page.
- To handle show/hide on the menu, I toggle a class.
ng-class="{down: vm.isHover}" - To toggle vm.isHover, I use the ng mouse events.
ng-mouseenter="vm.isHover = true"ng-mouseleave="vm.isHover = false"
For now, everything was fine and worked as expected.
The solution is clean and simple.
The incoming problem:
In a specific view, I have a list of elements.
I added an action panel when the cursor is over an element of the list.
I used the same code as above to handle the behavior.
The problem:
I figured out when my cursor is on the floating navigation menu and also on the top of an element, there is a conflict between each other.
The action panel showed up and the floating navigation was hide.
The thing is that even if the cursor is over the floating navigation menu, the list element ng-mouseenter is triggered.
It makes no sense to me, because I would expect an automatic break of the mouse propagation events.
I must say that I was disappointed and I spend some time to find out that problem.
First thoughts:
I tried to use these :
$event.stopPropagation()$event.stopImmediatePropagation()
I combined a lot of ng pointer events (mousemove, mouveover, ...) but none help me.
CSS solution:
I found the solution with a simple css property that I use more and more:
pointer-events: none;
Basically, I use it like that (on my list elements):
ng-style="{'pointer-events': vm.isHover ? 'none' : ''}"
With this tricky one, the ng-mouse events will no longer be triggered and my floating navigation menu will no longer close himself when the cursor is over it and over an element from the list.
To go further:
As you may expect, this solution works but I don't like it.
We do not control our events and it is bad.
Plus, you must have an access to the vm.isHover scope to achieve that and it may not be possible or possible but dirty in some way or another.
I could make a fiddle if someone want to look.
Nevertheless, I don't have another solution...
It's a long story and I can't give you a potato so please forgive me my friend.
Anyway, pointer-events: none is life, so remember it.
来源：https://stackoverflow.com/questions/4697758/prevent-onmouseout-when-hovering-child-element-of-the-parent-absolute-div-withou