Making multiple div appear when hovering a specific div - javascript

I'm trying to have elements appear when I'm hovering a specific one but I don't know which approach to chose. My project only contains html, css and javascript.
I want that when the user is hovering business rules (as seen on the picture), the other bubbles to lower in opacity and new bubbles to appear around the hovered one. Should I use js observer to add a class that will lower opacity on other bubbles and one that set visible the new bubbles ? My main problem being that I haven't found a way to trigger an observer on focus.

You can do everything with mouseenter and mouseleave events which you will set on large bubble divs.
Initial state would be that all large bubbles have the class large-bubble with normal opacity and small bubbles around the large one have the class small-bubble with display: none.
Add mouseenter and mouseleave event listeners to the large bubble
On mouseenter, do something like document.getElementsByClassName('.large-bubble') and apply different opacity. Add a class which will unset opacity to the bubble that is currently hovered. Then get all small bubbles belonging to the large bubble and remove display: none.
On mouseleave, reset everything to initial state.

There are many approaches,This is quite easy way. In this approach,you don't need JavaScript Dom manipulation to do this.
In order to do this, You need to have this kind of elements,
<div class="wrapper">
<div class="business_rules"></div>
</div>
<div class="other_bubbles"></div>
The Wrapper acts as parent for business bubble and other Bubbles.So you can design your business rules bubble inside the business_rules bubble div (I didn't designed it for simplicity of the code). Then your requirement is when hovering the business bubble,your other bubbles should display. So in the css file defined below rules,
.other_bubbles{
display:none;
}
.wrapper:hover ~ .other_bubbles {
display:block;
}
So that when you hovered the wrapper, your other bubbles will be displayed. In order to do that your other bubble should set it to display none at the beginning.

Related

How to fire mouseenter event when cursor is hidden behind other HTML element?

I am trying to create draggable chess pieces but I can't find any way to drop a piece on a square because when I hover over a droppable position while dragging a piece then the mouseenter event is not firing. I have noticed that z-index is the reason because when I put a lower z-index on a draggable piece then the mouseenter event works but this is not ideal since I can't see a piece that I am dragging anymore.
Here is a codepen that simulates the same behaviour (you have to open a console). When mouse enters a black box then mouseenter event fires but if mouse enters while dragging a blue box then mouseenter event doesnt fire.
Is there a way to force the mouseenter or mouseover event to fire even when the mouse is hidden behind another HTML element? My goal is to detect when I am dragging over a droppable position so I can move my piece from one div to the other.
I have found similar issue in this old question but I really don't like either tracking x-y coords of every droppable div or creating transparent element over a droppable div with high z-index so I am hoping there is a cleaner solution for this.
Based on Forwarding Mouse Events through layers/divs, looks like you simply have to modify your draggable CSS by adding...
pointer-events: none;
...so that it becomes...
.draggable{
cursor: grab;
position:absolute;
z-index: 5;
--size: calc(100% - 2*var(--padding));
pointer-events: none;
}
What does this do? When the drag starts and applies the draggable class to the element being dragged, it turns off mouse events for the dragged element, thus allowing the mouse events to pass through the dragged element to any elements underneath.
(See https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events for complete list of options and browser support.)

Event listener does not work when image element blocks it [duplicate]

I have a div that has background:transparent, along with border. Underneath this div, I have more elements.
Currently, I'm able to click the underlying elements when I click outside of the overlay div. However, I'm unable to click the underlying elements when clicking directly on the overlay div.
I want to be able to click through this div so that I can click on the underlying elements.
Yes, you CAN do this.
Using pointer-events: none along with CSS conditional statements for IE11 (does not work in IE10 or below), you can get a cross browser compatible solution for this problem.
Using AlphaImageLoader, you can even put transparent .PNG/.GIFs in the overlay div and have clicks flow through to elements underneath.
CSS:
pointer-events: none;
background: url('your_transparent.png');
IE11 conditional:
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='your_transparent.png', sizingMethod='scale');
background: none !important;
Here is a basic example page with all the code.
Yes, you CAN force overlapping layers to pass through (ignore) click events.
PLUS you CAN have specific children excluded from this behavior...
You can do this, using pointer-events
pointer-events influences the reaction to click-, tap-, scroll- und hover events.
In a layer that should ignore / pass-through mentioned events you set
pointer-events: none;
Children of that unresponsive layer that need to react mouse / tap events again need:
pointer-events: auto;
That second part is very helpful if you work with multiple overlapping div layers (probably some parents being transparent), where you need to be able to click on child elements and only that child elements.
Example usage:
.parent {
pointer-events:none;
}
.child {
pointer-events:auto;
}
<div class="parent">
I'm unresponsive
I'm clickable again, wohoo !
</div>
Allowing the user to click through a div to the underlying element depends on the browser. All modern browsers, including Firefox, Chrome, Safari, and Opera, understand pointer-events:none.
For IE, it depends on the background. If the background is transparent, clickthrough works without you needing to do anything. On the other hand, for something like background:white; opacity:0; filter:Alpha(opacity=0);, IE needs manual event forwarding.
See a JSFiddle test and CanIUse pointer events.
I'm adding this answer because I didn’t see it here in full. I was able to do this using elementFromPoint. So basically:
attach a click to the div you want to be clicked through
hide it
determine what element the pointer is on
fire the click on the element there.
var range-selector= $("")
.css("position", "absolute").addClass("range-selector")
.appendTo("")
.click(function(e) {
_range-selector.hide();
$(document.elementFromPoint(e.clientX,e.clientY)).trigger("click");
});
In my case the overlaying div is absolutely positioned—I am not sure if this makes a difference. This works on IE8/9, Safari Chrome and Firefox at least.
Hide overlaying the element
Determine cursor coordinates
Get element on those coordinates
Trigger click on element
Show overlaying element again
$('#elementontop').click(e => {
$('#elementontop').hide();
$(document.elementFromPoint(e.clientX, e.clientY)).trigger("click");
$('#elementontop').show();
});
I needed to do this and decided to take this route:
$('.overlay').click(function(e){
var left = $(window).scrollLeft();
var top = $(window).scrollTop();
//hide the overlay for now so the document can find the underlying elements
$(this).css('display','none');
//use the current scroll position to deduct from the click position
$(document.elementFromPoint(e.pageX-left, e.pageY-top)).click();
//show the overlay again
$(this).css('display','block');
});
I currently work with canvas speech balloons. But because the balloon with the pointer is wrapped in a div, some links under it aren't click able anymore. I cant use extjs in this case.
See basic example for my speech balloon tutorial requires HTML5
So I decided to collect all link coordinates from inside the balloons in an array.
var clickarray=[];
function getcoo(thatdiv){
thatdiv.find(".link").each(function(){
var offset=$(this).offset();
clickarray.unshift([(offset.left),
(offset.top),
(offset.left+$(this).width()),
(offset.top+$(this).height()),
($(this).attr('name')),
1]);
});
}
I call this function on each (new) balloon. It grabs the coordinates of the left/top and right/down corners of a link.class - additionally the name attribute for what to do if someone clicks in that coordinates and I loved to set a 1 which means that it wasn't clicked jet. And unshift this array to the clickarray. You could use push too.
To work with that array:
$("body").click(function(event){
event.preventDefault();//if it is a a-tag
var x=event.pageX;
var y=event.pageY;
var job="";
for(var i in clickarray){
if(x>=clickarray[i][0] && x<=clickarray[i][2] && y>=clickarray[i][1] && y<=clickarray[i][3] && clickarray[i][5]==1){
job=clickarray[i][4];
clickarray[i][5]=0;//set to allready clicked
break;
}
}
if(job.length>0){
// --do some thing with the job --
}
});
This function proofs the coordinates of a body click event or whether it was already clicked and returns the name attribute. I think it is not necessary to go deeper, but you see it is not that complicate.
Hope in was enlish...
Another idea to try (situationally) would be to:
Put the content you want in a div;
Put the non-clicking overlay over the entire page with a z-index higher,
make another cropped copy of the original div
overlay and abs position the copy div in the same place as the original content you want to be clickable with an even higher z-index?
Any thoughts?
I think the event.stopPropagation(); should be mentioned here as well. Add this to the Click function of your button.
Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event.
Just wrap a tag around all the HTML extract, for example
<a href="/categories/1">
<img alt="test1" class="img-responsive" src="/assets/photo.jpg" />
<div class="caption bg-orange">
<h2>
test1
</h2>
</div>
</a>
in my example my caption class has hover effects, that with pointer-events:none; you just will lose
wrapping the content will keep your hover effects and you can click in all the picture, div included, regards!
An easier way would be to inline the transparent background image using Data URIs as follows:
.click-through {
pointer-events: none;
background: url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7);
}
I think that you can consider changing your markup. If I am not wrong, you'd like to put an invisible layer above the document and your invisible markup may be preceding your document image (is this correct?).
Instead, I propose that you put the invisible right after the document image but changing the position to absolute.
Notice that you need a parent element to have position: relative and then you will be able to use this idea. Otherwise your absolute layer will be placed just in the top left corner.
An absolute position element is positioned relative to the first parent
element that has a position other than static.
If no such element is found, the containing block is html
Hope this helps. See here for more information about CSS positioning.
You can place an AP overlay like...
#overlay {
position: absolute;
top: -79px;
left: -60px;
height: 80px;
width: 380px;
z-index: 2;
background: url(fake.gif);
}
<div id="overlay"></div>
just put it over where you dont want ie cliked. Works in all.
This is not a precise answer for the question but may help in finding a workaround for it.
I had an image I was hiding on page load and displaying when waiting on an AJAX call then hiding again however...
I found the only way to display my image when loading the page then make it disappear and be able to click things where the image was located before hiding it was to put the image into a DIV, make the size of the DIV 10x10 pixels or small enough to prevent it causing an issue then hiding the containing div. This allowed the image to overflow the div while visible and when the div was hidden, only the divs area was affected by inability to click objects beneath and not the whole size of the image the DIV contained and was displaying.
I tried all the methods to hide the image including CSS display=none/block, opacity=0, hiding the image with hidden=true. All of them resulted in my image being hidden but the area where it was displayed to act like there was a cover over the stuff underneath so clicks and so on wouldn't act on the underlying objects. Once the image was inside a tiny DIV and I hid the tiny DIV, the entire area occupied by the image was clear and only the tiny area under the DIV I hid was affected but as I made it small enough (10x10 pixels), the issue was fixed (sort of).
I found this to be a dirty workaround for what should be a simple issue but I was not able to find any way to hide the object in its native format without a container. My object was in the form of etc. If anyone has a better way, please let me know.
I couldn't always use pointer-events: none in my scenario, because I wanted both the overlay and the underlying element(s) to be clickable / selectable.
The DOM structure looked like this:
<div id="outerElement">
<div id="canvas-wrapper">
<canvas id="overlay"></canvas>
</div>
<!-- Omitted: element(s) behind canvas that should still be selectable -->
</div>
(The outerElement, canvas-wrapper and canvas elements have the same size.)
To make the elements behind the canvas act normally (e.g. selectable, editable), I used the following code:
canvasWrapper.style.pointerEvents = 'none';
outerElement.addEventListener('mousedown', event => {
const clickedOnElementInCanvas = yourCheck // TODO: check if the event *would* click a canvas element.
if (!clickedOnElementInCanvas) {
// if necessary, add logic to deselect your canvas elements ...
wrapper.style.pointerEvents = 'none';
return true;
}
// Check if we emitted the event ourselves (avoid endless loop)
if (event.isTrusted) {
// Manually forward element to the canvas
const mouseEvent = new MouseEvent(event.type, event);
canvas.dispatchEvent(mouseEvent);
mouseEvent.stopPropagation();
}
return true;
});
Some canvas objects also came with input fields, so I had to allow keyboard events, too.
To do this, I had to update the pointerEvents property based on whether a canvas input field was currently focused or not:
onCanvasModified(canvas, () => {
const inputFieldInCanvasActive = // TODO: Check if an input field of the canvas is active.
wrapper.style.pointerEvents = inputFieldInCanvasActive ? 'auto' : 'none';
});
it doesn't work that way. the work around is to manually check the coordinates of the mouse click against the area occupied by each element.
area occupied by an element can found found by 1. getting the location of the element with respect to the top left of the page, and 2. the width and the height. a library like jQuery makes this pretty simple, although it can be done in plain js. adding an event handler for mousemove on the document object will provide continuous updates of the mouse position from the top and left of the page. deciding if the mouse is over any given object consists of checking if the mouse position is between the left, right, top and bottom edges of an element.
Nope, you can't click ‘through’ an element. You can get the co-ordinates of the click and try to work out what element was underneath the clicked element, but this is really tedious for browsers that don't have document.elementFromPoint. Then you still have to emulate the default action of clicking, which isn't necessarily trivial depending on what elements you have under there.
Since you've got a fully-transparent window area, you'll probably be better off implementing it as separate border elements around the outside, leaving the centre area free of obstruction so you can really just click straight through.

Javascript\Jquery mouse cursor - Inconsistencies when hovering items

I'd like to replace the mouse cursor on my website with a custom one, composed of two elements:
a cursor;
a trail that follows the cursor and lags behind it.
Doing that with jquery is extremely easy.
1) You hide the default cursor in CSS:
html, body {cursor:none;}
2) You create two different divs (one for the cursor itself and one for the trail) and style them:
<div id="mouse_cursor" class="mouse_cursor"></div>
<div id="mouse_trail" class="mouse_trail"></div>
3) You create the logic for each one of them:
function moveCursor(e) {
$('#mouse_cursor').css({'left' : e.pageX,'top' : e.pageY });
}
$(window).on('mousemove', moveCursor);
function moveTrail(e) {
TweenMax.to('#mouse_trail', 0.35, {
css: {left: e.pageX,top: e.pageY},
ease:SlowMo.easeIn
}
)};
$(window).on('mousemove', moveTrail);
(In my case the trail effect is made using Greensock's GSAP).
Now... this works perfectly as long as the cursor style isn't changed. Here's a fiddle, for your reference: https://jsfiddle.net/collederfomento/jvy1zfg8/27/
I'd like to change the style of the cursor once it hovers specific elements, however, and that's where I am encountering a few issues.
The way I have attempted to do that is the following:
1) Create a function bound to the mouseenter \ mouseover events that adds a class to the cursor if it's hovering the element:
$(".hover").bind( "mouseenter mouseover", function() {
$("#mouse_cursor").addClass("mouse_cursor_hover");
});
2) ... and then a second function that removes the class once the cursor is not hovering the element anymore:
$(".hover").mouseleave(function() {
$("#mouse_cursor").removeClass("mouse_cursor_hover");
});
3) Lastly, of course, I added the style for the "hover" cursor:
.mouse_cursor_hover {width:300px;height:300px;}
As you can see in this fiddle ( https://jsfiddle.net/collederfomento/z4e1qjbc/13/ ) the hover event is not firing properly, and the mouse cursor flickers.
I have tried several other approaches (using Javascript event listener rather than the above mentioned functions, using the css property rather than toggling a class, etc.) but they all behave in the same way.
What's curious is that if I remove the functions that make the cursors move, then the hover event is handled flawlessly. I believe the combination of the two functions is causing the issue, but I have no clue why (or how to solve it).
I think the cursor and the trail elements are interfering with the hover events. Even though they are at a high z-index, the browser still has to take them into account to figure out which element is actually getting hovered. The mouse cursor is still going over them after all, since they are not a “real” cursor, but actual elements positioned in that place.
Adding pointer-events none to both of them seems to fix the issue for the most part (checked in Chrome and Firefox, in both it seemed to significantly improve), so please give that a try:
.mouse_cursor,
.mouse_trail {
pointer-events:none;
}
https://jsfiddle.net/aur39py4/1/
I am assuming that you are not going to need any sort of hover effect on the cursor and trail themselves, so setting pointer-events:none should not have any adverse effects on the rest of what you’re doing on the page.

Sortable appending to wrong target

I have a sortable element whose children are also sortable.
Here's a JSFiddle demonstrating what I've got so far.
In the fiddle or image below, the blue area is #container, white boxes are .child and group of such boxes marked with a black border is .parent.
#container and .parent are sortables.
If an item is dragged and dropped from one .parent to another .parent, I'm simply appending the item (jQuery ui does this automatically). If an item (.child) is dropped into #container I'm wrapping it in a .parent div to mark it as a new parent.
Now, select prod3 by clicking it, drag it to the left of prod5 till placeholder appears to the left of prod5. drag prod3 down as much as possible while still having the placeholder to the left of prod5, then drop it.
If jQuery UI detects it as a drop inside the .parent of prod5, the expected result should look like the following:
If it is detected as a drop in #container the expected result should be as follows:
Now what's happening (evident from logs in console): a receive event is triggered on #container , even though placeholder was inside .parent. I can live with that - but the problem is, even though the receive event was fired on #container, the dragged item prod3 is appended to .parent and no receive event was triggered on .parent!
So due to this strange behavior, since the receive event is triggered on #container, the item is wrapped in a .parent div, but it's then appended to the .parent which contained prod5. Hence I get a .parent div inside a .parent div as shown in picture below, which should not happen.
Does any one have any idea why this is happening? Or can someone suggest a better way for doing this (sortable items inside a sortable container)?
Side note: this is a corner case and you might have to try it few times to reproduce this scenario.
Update:
According to this smaller demo, this seems to be a bug with jquery ui, which i reported here. A temporary workaround is to manually handle the situation inside #container's receive event as in this answer. any better solutions are welcome...
Solution is very easy
You need to add this condition:
if (!ui.item.parent().hasClass('parent')){
ui.item.wrap(parent).before(helper);
}
I found that additional .parent div appearing only when items parent has class .parent .ui-sortable and if it have class just .ui-sortable it fully works. So simply add this condition and all works fine.
FIDDLE
Okay, so it seems the .parent thinks the .child is still inside when it isn't.
A test with bigger borders shows that when the pointer is outside the margin, below the .parent, the expected behaviour is that the parent should collapse and the #container should accept the .child.
This only happens if you drag it down after half width of the .child, and this completely disappears if you drag it left onto the previous .child and go back to the normal position.
This is why the #container receives the drop event -- it's happening in the container!
In my version of your JSFiddle, one can reproduce the bug by moving a .child onto another .child and then downwards, until below the black margin. Notice that the parent (The black box) doesn't shrink even though it the child is outside.
This behaviour is partially fixed with higher versions of JQuery UI.
With JQuery 2.0.2 and JQuery UI 1.10.3, it's completely fixed.
It's very likely that this is a bug.

Fire click events on div but pass through hover

I have a div that is absolutely positioned above other absolutely positioned divs and I want the divs below the have both mouseover, mouseout and click events and the top div to have click events also.
The only way I've been able to get mouse events on the divs below is to add pointer-events: none to the above div but then the above div does not get click events when that css property is present.
Here is a codepen showing the problem
http://codepen.io/Wryte/pen/qsEBp
#Wryte AH! ok, there is a problem with what you are trying to accomplish. The shade is not a container as a layer over the whole outer div that covers the rest of the inner DIVs. Since the shade div is not in the chain for event bubbling it won't get called or if you catch events on the shade DIV you won't get the events triggered on the inner DIVs.
What you can do, is to darken the outer DIV and add transparency to the inner DIVs. Why do you need to track events on the shade DIV by the way?

Categories