I want a function that tells me which element the mouse cursor is over.
So, for example, if the user's mouse is over this textarea (with id wmd-input), calling window.which_element_is_the_mouse_on() will be functionally equivalent to $("#wmd-input").
DEMO
There's a really cool function called document.elementFromPoint which does what it sounds like.
What we need is to find the x and y coords of the mouse and then call it using those values:
document.addEventListener('mousemove', e => {
console.clear()
console.log( document.elementFromPoint(e.clientX, e.clientY) )
}, {passive: true})
[class^='level']{
width: 100px;
height: 100px;
padding: 15px;
background: #00000033;
}
<div class='level-1'>
<div class='level-2'>
<div class='level-3'>
Hover
</div>
</div>
</div>
document.elementFromPoint
jQuery event object
In newer browsers, you could do the following:
document.querySelectorAll( ":hover" );
That'll give you a NodeList of items that the mouse is currently over in document order. The last element in the NodeList is the most specific, each preceding one should be a parent, grandparent, and so on.
Although the following may not actually answering the question, since this is the first result of googling (the googler may not asking exactly the same question:), hope it will provide some extra input.
There are actually two different approaches to get a list of all elements the mouse is currently over (for newer browsers, perhaps):
The "structural" approach - Ascending DOM tree
As in dherman's answer, one can call
var elements = document.querySelectorAll(':hover');
However, this assumes that only children will overlay their ancestors, which is usually the case, but not true in general, especially when dealing with SVG where element in different branches of the DOM tree may overlap each other.
The "visual" approach - Based on "visual" overlapping
This method uses document.elementFromPoint(x, y) to find the topmost element, temporarily hide it (since we recover it immediately in the same context, the browser will not actually renders this), then go on to find the second topmost element... Looks a little hacky, but it returns what you expect when there are, e.g., siblings elements in a tree occluding each other. Please find this post for more details,
function allElementsFromPoint(x, y) {
var element, elements = [];
var old_visibility = [];
while (true) {
element = document.elementFromPoint(x, y);
if (!element || element === document.documentElement) {
break;
}
elements.push(element);
old_visibility.push(element.style.visibility);
element.style.visibility = 'hidden'; // Temporarily hide the element (without changing the layout)
}
for (var k = 0; k < elements.length; k++) {
elements[k].style.visibility = old_visibility[k];
}
elements.reverse();
return elements;
}
Try both, and check their different returns.
elementFromPoint() gets only the first element in DOM tree. This is mostly not enough for developers needs. To get more than one element at e.g. the current mouse pointer position, this is the function you need:
document.elementsFromPoint(x, y) . // Mind the 's' in elements
This returns an array of all element objects under the given point.
Just pass the mouse X and Y values to this function.
More information is here: DocumentOrShadowRoot.elementsFromPoint()
For very old browsers which are not supported, you may use this answer as a fallback.
The following code will help you to get the element of the mouse pointer. The resulted elements will display in the console.
document.addEventListener('mousemove', function(e) {
console.log(document.elementFromPoint(e.pageX, e.pageY));
})
Mouseover events bubble, so you can put a single listener on the body and wait for them to bubble up, then grab the event.target or event.srcElement:
function getTarget(event) {
var el = event.target || event.srcElement;
return el.nodeType == 1? el : el.parentNode;
}
<body onmouseover="doSomething(getTarget(event));">
You can look at the target of the mouseover event on some suitable ancestor:
var currentElement = null;
document.addEventListener('mouseover', function (e) {
currentElement = e.target;
});
Here’s a demo.
Demo :D
Move your mouse in the snippet window :D
<script>
document.addEventListener('mouseover', function (e) {
console.log ("You are in ", e.target.tagName);
});
</script>
<!-- One simple solution to your problem could be like this: -->
<div>
<input type="text" id="fname" onmousemove="javascript: alert(this.id);" />
<!-- OR -->
<input type="text" id="fname" onclick="javascript: alert(this.id);" />
</div>
<!-- Both mousemove over the field & click on the field displays "fname"-->
<!-- Works fantastic in IE, FireFox, Chrome, Opera. -->
<!-- I didn't test it for Safari. -->
You can use this selector to undermouse object and then manipulate it as a jQuery object:
$(':hover').last();
2022 Update:
document.elementsFromPoint() (Note the 's' in elements) is compatible with all major browsers. It basically does the same thing that elementFrompoint does, but retrieves all the elements in DOM order.
Mozilla has a good example of this:
HTML
<div>
<p>Some text</p>
</div>
<p>Elements at point 30, 20:</p>
<div id="output"></div>
JavaScript
let output = document.getElementById("output");
if (document.elementsFromPoint) {
let elements = document.elementsFromPoint(30, 20);
for (var i = 0; i < elements.length; i++) {
output.textContent += elements[i].localName;
if (i < elements.length - 1) {
output.textContent += " < ";
}
}
} else {
output.innerHTML = "<span style=\"color: red;\">" +
"Browser does not support <code>document.elementsFromPoint()</code>" +
"</span>";
}
Output
Some text
Elements at point 30, 20:
p < div < body < html
https://developer.mozilla.org/en-US/docs/Web/API/Document/elementsFromPoint
The target of the mousemove DOM event is the top-most DOM element under the cursor when the mouse moves:
(function(){
//Don't fire multiple times in a row for the same element
var prevTarget=null;
document.addEventListener('mousemove', function(e) {
//This will be the top-most DOM element under cursor
var target=e.target;
if(target!==prevTarget){
console.log(target);
prevTarget=target;
}
});
})();
This is similar to #Philip Walton's solution, but doesn't require jQuery or a setInterval.
Here's a solution for those that may still be struggling. You want to add a mouseover event on the 'parent' element of the child element(s) you want detected. The below code shows you how to go about it.
const wrapper = document.getElementById('wrapper') //parent element
const position = document.getElementById("displaySelection")
wrapper.addEventListener('mousemove', function(e) {
let elementPointed = document.elementFromPoint(e.clientX, e.clientY)
console.log(elementPointed)
});
Demo on CodePen
Let me start out by saying that I don't recommend using the method I'm about to suggest. It's much better to use event driven development and bind events only to the elements you're interested in knowing whether or not the mouse is over with mouseover, mouseout, mouseenter, mouseleave, etc.
If you absolutely must have the ability to know which element the mouse is over, you'd need to write a function that binds the mouseover event to everything in the DOM, and then store whatever the current element is in some variable.
You could so something like this:
window.which_element_is_the_mouse_on = (function() {
var currentElement;
$("body *").on('mouseover', function(e) {
if(e.target === e.currentTarget) {
currentElement = this;
}
});
return function() {
console.log(currentElement);
}
}());
Basically, I've created an immediate function which sets the event on all elements and stores the current element within the closure to minimize your footprint.
Here's a working demo that calls window.which_element_is_the_mouse_on every second and logs what element the mouse is currently over to the console.
http://jsfiddle.net/LWFpJ/1/
So basically what I want to do is if the use hits mouse down inside of a div select the last cursor point inside of a textbox this way the user could still drag the mouse over the text to select it.
Currently I have this:
HTML:
<div class="VS-search-inner" onclick="innerSearchPanelClicked(event)">
JS:
function innerSearchPanelClicked(e){
var inputToFocus = $( e.target ).find("input").last();
if(inputToFocus.is('input')){
inputToFocus.focus();
var length = inputToFocus.val().length;
inputToFocus.setCursorPosition(length);
}
}
This works well on click but if I try to change it to mouse down it keeps loosing focus on the input.
The mouse click is going through after the input is selected, causing it to lose focus. Try using a timeout.
function innerSearchPanelClicked(e){
var target = e.target;
setTimeout(function () {
var inputToFocus = $( target ).find("input").last();
if(inputToFocus.is('input')){
inputToFocus.focus();
var length = inputToFocus.val().length;
inputToFocus.setCursorPosition(length);
}
},10);
}
So let's say we have:
A container for everything
A baseDiv inside that container
//let's create a base layer
var container = document.getElementById('container')
var baseDiv = document.createElement('div')
baseDiv.id = 'baseDiv'
baseDiv.innerText = 'this is the base div'
baseDiv.addEventListener('mouseover', createLayer)
container.appendChild(baseDiv)
When the user mouses over:
A layerOnTop, of the same size is put on top of the baseDiv.
When the user mouses out:
The layerOnTop is removed.
function createLayer(){
console.log('creating layer')
layerOnTop = document.createElement('div')
layerOnTop.id = 'layerOnTop'
layerOnTop.addEventListener('mouseout',
function(){
console.log('removing layer')
return layerOnTop.parentElement.removeChild(layerOnTop)
})
container.appendChild(layerOnTop) }
Simple and works great.
However, when layerOnTop contains elements as well (buttons, inputs), the behavior gets very erratic and starts flicking as you're technically exiting the layerOnTop.
//it contains two textareas
layerOnTop.appendChild(document.createElement('textarea'))
layerOnTop.appendChild(document.createElement('textarea'))
I wish I could use mouseenter but it doesn't seem to be supported by Chrome.
Here's my jsfiddle: http://jsfiddle.net/DjRBP/
How can I stop this? I wish I could merge the textareas and layerOnTop into one large mouseover-handling conglomerate.
You need to check in your mouse out event that it's actually leaving the element. Change your mouseout function to:
function(event) {
var e = event.toElement || event.relatedTarget;
if (e.parentNode == this || e == this) {
// We're not actually leaving the parent node so don't remove layer
return;
}
console.log('removing layer')
return layerOnTop.parentElement.removeChild(layerOnTop)
})
I Have created Custom Alert Box in Javascript . I Have added text with images. but It is not align proberly. It came some thing like this.
I am trying to add the correct mark and text with same line, how can I achieve this. can anyone please help me. I have added my Custom alert box Function below.
function createCustomAlert(txt, string_url,fd) {
// shortcut reference to the document object
d = document;
// if the modalContainer object already exists in the DOM, bail out.
if (d.getElementById("modalContainer")) return;
// create the modalContainer div as a child of the BODY element
mObj = d.getElementsByTagName("body")[0].appendChild(d.createElement("div"));
mObj.id = "modalContainer";
// make sure its as tall as it needs to be to overlay all the content on the page
mObj.style.height = document.documentElement.scrollHeight + "px";
// create the DIV that will be the alert
alertObj = mObj.appendChild(d.createElement("div"));
alertObj.id = "alertBox";
// MSIE doesnt treat position:fixed correctly, so this compensates for positioning the alert
if (d.all && !window.opera) alertObj.style.top = document.documentElement.scrollTop + "px";
// center the alert box
alertObj.style.left = (d.documentElement.scrollWidth - alertObj.offsetWidth) / 2 + "px";
// create an H1 element as the title bar
h1 = alertObj.appendChild(d.createElement("h1"));
h1.appendChild(d.createTextNode(ALERT_TITLE));
btn2 = alertObj.appendChild(d.createElement("img"));
btn2.id = "fd";
btn2.src = fd;
// create a paragraph element to contain the txt argument
msg = alertObj.appendChild(d.createElement("p"));
msg.innerHTML = txt;
// create an anchor element to use as the confirmation button.
//btn = alertObj.appendChild(d.createElement("a"));
//btn.id = "closeBtn";
//btn.appendChild(d.createTextNode(ALERT_BUTTON_TEXT));
//btn.href = "";
btn = alertObj.appendChild(d.createElement("img"));
btn.id = "closeBtn";
btn.src = 'new-go-next2.png';
btn.href="#ss";
//btn.height="30px";
//btn.width="30px";
//btn.href="#";
// set up the onclick event to remove the alert when the anchor is clicked
btn.onclick = function () { removeCustomAlert(); window.location = string_url; return false; }
}
well yes creating a table would be a great approach to solve your problems , btw u can also try some internal divs with proper position anf the element having correct float attribute
Rather creating div element create table with two Columns. First of which will contain 'Image' for OK and Second one will contain your 'Text'.
Check if this helps.
I'm new to Javascript and am having a bit of an issue with using a NOT selector, and adding a class during the function, hopefully this will make sense to someone.
I am creating a small gallery, and my goal is to have clickable navigation, however the active image will redirect to another page when clicked.
Code is as follows:
$("ul#mainGallery li:not(.active) a").click(function(){
var thisListClass = $(this).parent().attr('class');
var activeListId = $(this).parent().attr('id');
var newMarginLeft = (activeListId-3) * -200;
var animateAction = {};
animateAction['margin-left'] = newMarginLeft + 'px';
$("ul#mainGallery").animate(animateAction, 1000);
$('li.active img').animate({width:'100px', height:'100px'},1000)
$(this + 'img').animate({width:'300px', height:'300px'},1000)
$(li.active).removeClass('active');
$(this).parent().addClass('active');
return false;
I know there is likely a much better way to do this, but I can't get my head around it.
Edit: I should probably say what the problem is...
When an active image is clicked, it follows the hyperlink all is well.
When a non active image is clicked, it begins the animation, then (i assume) when the 'active' class is added, instead of returning false, it returns true and follows the hyperlink.
You are binding the click event to $("ul#mainGallery li:not(.active) a") whenever that code is run (presumably on document load). The items which are not active at that point will have that item bound, and changing the class afterwards on other items won't bind this event to them. You will need to either change how you bind it or check inside the function whether the item has that class.
Something like this:
$("ul#mainGallery li a").click(function(){
if(!$(this).parent().hasClass('active')){
var thisListClass = $(this).parent().attr('class');
var activeListId = $(this).parent().attr('id');
var newMarginLeft = (activeListId-3) * -200;
var animateAction = {};
animateAction['margin-left'] = newMarginLeft + 'px';
$("ul#mainGallery").animate(animateAction, 1000);
$('li.active img').animate({width:'100px', height:'100px'},1000)
$(this + 'img').animate({width:'300px', height:'300px'},1000)
$('li.active').removeClass('active');
$(this).parent().addClass('active');
return false;
}
EDIT, or if you prefer to continue using the same selector with the :not and everything, then switch your click function to .live()
To stop the default behaviour use the preventDefault() function
$("ul#mainGallery li:not(.active) a").click(function(e){
e.preventDefault(); // will stop the default behaviour
}
Read more on Jquery docs