Red square is the part of a container with class "parent". If I hover mouse over that red square it disappears. But why? I expected that it shouldn't.
Expected behaviour: it does not disappear since red square is a part of ".parent" container and I have clearly stated, that the mouseout event occurs on that container.
There was a suggestion, that this question is a duplicate of
JavaScript mouseover/mouseout issue with child element
In some way - yes, but I think that this question provides value, because it not only provides the solution ("you can try this"), but also explains WHY you should use that and WHY the initial solution is not working as it is supposed to.
<span class="parent">Hover mouse over this text<br></span>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
function removeSquare()
{
$(this).find(".kvadrat").remove();
}
function addSquare()
{
$(this).append("<span style='display:inline-block;width: 50px;height: 50px;background-color:red' class='kvadrat'></span>");
$(this).on("mouseout", removeSquare);
}
$(".parent").on("mouseover", addSquare);
</script>
It's normal behaviour of .mouseout() event.
Show the number of times mouseout and mouseleave events are triggered.
mouseout fires when the pointer moves out of the child element as
well, while mouseleave fires only when the pointer moves out of the
bound element.
You should use .mouseenter() and .mouseleave() events,
function removeSquare()
{
$(this).find(".kvadrat").remove();
}
function addSquare()
{
$(this).append ( "<span style='display:inline-block;width: 50px;height: 50px;background-color:red' class='kvadrat'></span>" );
}
$ ( ".parent" ).on ( "mouseenter", addSquare );
$(".parent").on("mouseleave", removeSquare);
.parent {
display: inline-block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span class="parent">Hover mouse over this text<br></span>
As other people have noted, your original problem is that mouseover and mouseout events also fire for child elements. The solution to that issue is either to use jQuery's mouseenter and mouseleave events, or simply to replace the JS code with the CSS :hover pseudo-class.
However, the reason why the other JS and CSS solutions posted here sometimes behave erratically (causing the square to disappear if you move the mouse over it slowly, but not if you move it fast, and not on all browsers even if you move it slowly) is because, depending on your browser and font settings, there may or may not be a small gap between the top line of text and the square below it. If the gap exists, and your mouse cursor hits it while moving from the text to the square, the browser will consider the mouse to have left the parent element, and will thus hide the square.
Setting a (light blue) background color on the parent element shows the issue clearly; depending on what font and line height the browser chooses, the parent element and the box can look like this:
or like this:
Manually setting a particularly large line height makes the problem easily reproducible (CSS example based on Thomas van Broekhoven's answer):
.kvadrat {
display: none;
}
.parent:hover > .kvadrat {
display: inline-block;
background-color: red;
width: 50px; height: 50px;
}
.parent {
line-height: 2.0;
background: lightblue;
}
<span class="parent">Hover mouse over this text!<br>
Here's another line of text.<br>
<span class='kvadrat'></span></span>
There are two general ways to fix this issue. The simplest option, where practical, is to make the parent element a block, thereby eliminating the gaps between the lines. You may also wish to add position: absolute to the square's style, so that it won't expand its parent element when it appears:
.kvadrat {
display: none;
}
.parent:hover > .kvadrat {
display: inline-block;
position: absolute;
background-color: red;
width: 50px; height: 50px;
}
.parent {
display: block;
line-height: 2.0;
background: lightblue;
}
<span class="parent">Hover mouse over this text!<br>
Here's another line of text.<br>
<span class='kvadrat'></span></span>
Alternatively, if you really want to stick with an inline parent element (e.g. because you want it to be able to wrap across several lines of text), you can set a negative top margin on the square to make sure it overlaps the line of text above it. If you don't want the square to visibly overlap the text, you can further move all the visible content of the square into an inner element and set a corresponding positive top margin on it, like this:
.kvadrat {
display: none;
}
.parent:hover > .kvadrat {
display: inline-block;
position: absolute;
margin-top: -1em;
border: 1px dashed gray; /* to show the extent of this otherwise invisible element */
}
.kvadrat > .inner {
display: block;
margin-top: 1em;
background-color: red;
width: 50px; height: 50px;
}
.parent {
line-height: 2.0;
background: lightblue;
}
<span class="parent">Hover mouse over this text!<br>
Here's another line of text.<br>
<span class='kvadrat'><span class='inner'></span></span></span>
I know this is not directly answering your JavaScript question, but I would like to open your eyes if you're not bounded to JavaScript. You can easily achieve this with CSS.
.kvadrat {
display: none:
}
.parent:hover > .kvadrat {
display: inline-block;
background-color: red;
width: 50px;height: 50px;
}
<span class="parent">Hover mouse over this text<br>
<span class='kvadrat'></span></span>
You can achieve the same using CSS.
.child {
display: none:
}
.parent:hover > .child {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
}
<span class="parent">Hover mouse over this text<br>
<span class='child'></span>
</span>
It is because of event bubbling. When you enter the child span, you jQuery will fire mouseout because you've now gone to a child span. If you want to keep it going, use mouseenter and louseleave which does not fire until you leave the actual element, regardless of child elements.
<span class="parent">Hover mouse over this text<br></span>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
function removeSquare()
{
$(this).find(".kvadrat").remove();
}
function addSquare()
{
$(this).append ( "<span style='display:inline-block;width: 50px;height: 50px;background-color:red' class='kvadrat'></span>" );
$(this).on("mouseleave", removeSquare);
}
$ ( ".parent" ).on ( "mouseenter", addSquare );
</script>
Related
Look at the code of below, as you can see there is a close icon floated to the right of a span element.
span {
width: 100%;
display: inline-block;
}
span:after {
content: "\2715";
float: right;
position: absolute;
}
span:hover:after {
cursor: pointer;
}
<span>Content</span>
I want the :after to behave like a button. As you could see, it makes the cursor a pointer on hover. How can I make it to behave like a button? For example, how can I add an onclick function to it?
Generally speaking, the pseudo element will inherit the events and event behavior assigned to the non-pseudo element that "owns" it.
So for instance, adding a click event listener to the above <span> will cause any pseudo elements of that span elemenet to inherit the same click event behavior.
If you wanted to achieve independence between the pseudo element and the "owner" element, in terms of click behavior (ie click behavior for the "pseudo" element only) you could use the pointer-events CSS property as shown below:
const span = document.querySelector("span");
span.addEventListener("click", () => alert("hey!"));
span {
display: inline-block;
position: relative;
background:red;
/* Blocks the click event from firing when span is clicked */
pointer-events:none;
}
span:after {
content: "'Pesudo button' - click me!";
position: absolute;
margin-left:1rem;
background:green;
width:15rem;
text-align:center;
color:white;
/* Allows the click event to fire when the pesudo element is clicked */
pointer-events:all;
}
span:hover:after {
cursor: pointer;
}
<span>I own the pesudo element</span>
I have a div that scrolls with a lot of text in it. My question is, is it possible to detect a click on the border of the div?
What I'd like to accomplish is if the user clicks on the bottom border (which is styled 4px wide with CSS), the div scrolls all the way to the bottom. Is this even possible without adding more markup?
You can try this:
$('div').click(function(e){
if(e.offsetY >$(this).outerHeight() - 4){
alert('clicked on the bottom border!');
}
});
Demo.
The .outerHeight() just returns the height of the content (including border). The e.offsetY returns the clicked Y relative to the element. Note about the outerHeight, if passing a bool true argument, it will include margin in the calculated value, the default is false, so it just returns content height + padding + border.
UPDATE: Looks like FireFox has its own way of behavior. You can see that when clicking, holding mouse down on an element, it's very natural and convenient to know the coordinates of the clicked point relative to the element. But looks like we have no convenient way to get that coordinates in the so-called FireFox because the e.offsetX and e.offsetY simply don't work (have no value). Instead you have to use the pageX and pageY to subtract the .offset().left and .offset().top respectively to get the coordinates relative to the element.
Updated demo
I never tried it, But I don't see why it shouldn't work :
Calculate the height of the element.
calculate the bottom border
calculate the offset inside the element itself, like in here
jQuery get mouse position within an element
Now you can check if the mouse position is inside the bottom border using some math.
I'm not sure how box-sizing fits into this, But that's how I would start around.
You have a wrapper around your element and set the padding to what ever you want to be detected.
jQuery
$("#border").click(function (e) {
if(e.target !== e.currentTarget) return;
console.log("border-clicked")
});
#border {
padding: 4px;
background: blue;
box-sizing: border-box;
cursor: pointer;
}
.box{
height: 100px;
width: 100%;
background: white;
cursor: default;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="border">
<div class="box"></div>
</div>
Vanilla JS
var border = document.getElementById("border");
border.onclick = function(e) {
if(e.target !== e.currentTarget) return;
console.log("border-clicked")
}
#border {
padding: 4px;
background: blue;
box-sizing: border-box;
cursor: pointer;
}
.box{
height: 100px;
width: 100%;
background: white;
cursor: default;
}
<div id="border">
<div class="box"></div>
</div>
I have a weird issue with drag & drop in HTML5.
There are 3 target zones which are divs with text in them and 1 source zone which is a div containing a image.
I use dragenter and dragleave events to change the border of the active target zone to project where the dragged object is going to land.
The problem is that as soon as you drag it over text, it for some reason fires the dragleave event, removing the border.
Here is a jsfiddle example illustrating the problem
And here is some inline code:
HTML
<h1>Targets</h1>
<div class="targets">
<div class="target">I am a target<br/>Touch text while dragging to see the problem</div>
<div class="target">I am a target<br/>Touch text while dragging to see the problem</div>
<div class="target">I am a target<br/>Touch text while dragging to see the problem</div>
</div>
<h1>Source</h1>
<div class="source" draggable="true">
<img class="source_image" src="http://lorempixel.com/output/technics-q-c-184-69-8.jpg" alt="image" width="184" height="69"/>
</div>
JS
$("div.source").on('dragstart', function(e) {
$(this).fadeTo('slow', 0.4);
});
$("div.source").on('dragend', function(e) {
$(this).fadeTo('slow', 1);
});
$("div.target").on('dragover', function(e) {
if (e.preventDefault) {
e.preventDefault();
}
e.dataTransfer.dropEffect = 'move';
return false;
});
$("div.target").on('dragenter', function(e) {
$(this).addClass('over');
});
$("div.target").on('dragleave', function(e) {
$(this).removeClass('over');
});
CSS
h1 {
font-size: 2em;
text-align: center;
}
.target {
margin: 1em;
display:inline-block;
width: 184px;
height: 69px;
border: 5px #995555 solid;
border-radius: 5px;
background-color: #AAAAAA;
vertical-align: bottom;
text-align: center;
font-size: 1.1em;
font-weight: bold;
line-height: 0.9em;
}
.target.over {
border: 5px #0A0 dashed;
}
.source {
margin: 1em;
display:inline-block;
width: 184px;
height: 69px;
border: 5px #555599 solid;
border-radius: 5px;
background-color: #CCCCCC;
vertical-align: bottom;
text-align: center;
font-size: 1.4em;
font-weight: bold;
}
Does anyone know of any solutions to keep the border changed even when touching text?
Another question would be whether it is possible to keep the border around the source div being dragged?
On a final note, I realize that both of these things can be done by using jQuery UI draggable and droppable, but I'm specifically wondering if it is possible to do this with native HTML5 drag & drop.
The problem is that the text constitutes an extra node in the DOM, and dragleave and dragenter take into account child elements as well as parent elements. When the cursor enters the text node, it leaves the div. This is similar to the mouseout vs mouseleave issue. A simple way to work around it is to keep a count of the events and only remove the style when all are accounted for:
var count=0;
$("div.target").on('dragenter', function(e) {
$(this).addClass('over');
count++;
}).on('dragleave', function(e) {
if (--count<=0) {
$(this).removeClass('over');
}
});
This isn't necessarily completely reliable (remember to set count to zero in the drop event), but it'll work better than your current setup. Another option is to not put any content in the div elements at all, instead add it with CSS:
.target:after {
content: 'I am a target \A Touch text while dragging to see the problem';
white-space: pre-wrap;
}
This has some accessibility drawbacks, because generated content is invisible to assistive technology, and will only let you add text, but is in many ways a cleaner solution.
I have a layout where images "float" within a certain area. The layout looks like this:
The source like this:
<div class="free_tile">
<a class="img_container canonical" href="/photos/10">
<img class="canonical" src="http://s3.amazonaws.com/t4e-development/photos/1/10/andrew_burleson_10_tile.jpg?1303238025" alt="Andrew_burleson_10_tile">
<!-- EDIT: I am aware that I can put the badge here. See the edit notes and image below. -->
</a>
<div class="location">Houston</div>
<div class="taxonomy"> T6 | Conduit | Infrastructure </div>
</div>
The CSS looks like this (in SCSS):
div.free_tile { width: 176px; height: 206px; float: left; margin: 0 20px 20px 0; position: relative;
&.last { margin: 0 0 20px 0; }
a.img_container { display: block; width: 176px; height: 158px; text-align: center; line-height: 156px; margin-bottom: 10px; }
img { margin: 0; border: 1px solid $dark3; display: inline-block; vertical-align: middle; #include boxShadow;
&.canonical { border: 1px solid $transect; }
}
.location, .taxonomy { width: 176px; }
.location { font-weight: 700; }
.taxonomy { line-height: 10px; font-size: 10px; text-transform: uppercase; height: 20px; overflow: hidden; }
}
div.transect_badge { height: 20px; width: 20px; background: url('/images/transect-badge.png'); }
So, basically the images are sitting vertically-aligned middle and text-aligned center, and they have a maximum width of 176 and max height of 158, but they're cropped to maintain the original aspect ratio so the actual top corner of each image falls differently depending on which image it is.
I have a badge that I'd like to put in the top corner of certain images (when the image is "canonical"). You see the style for this above (div.transect_badge).
The problem, of course, is I don't know where the top corner of the image will be so I can't hardcode the position via CSS.
I assume that I'll need to do this via jQuery or something. So, I started with a jQuery method to automatically append the badge div to any canonical images. That works fine, but I can't figure out how to position it over the top left corner.
How can this be done? (ideally using just HTML and CSS, but realistically using JS/jQuery)
--EDIT--
Here's the problem: The image is floating inside a container, so the corner of the image might fall anywhere inside the outer limits of the container. Here's an example of what happens if I try to use position:absolute; top:0; left:0 inside the same container the image is bound by:
It took some tryouts, but here it is: the size independent image badge positioner.
HTML:
<div class="tile">
<span class="photo">
<img src="/photos/10.jpg" alt="10" /><ins></ins>
</span>
<p class="location">Houston</p>
<p class="taxonomy">T6 | Conduit | Infrastructure</p>
</div>
CSS:
.tile {
float: left;
width: 176px;
height: 206px;
margin: 0 20px 20px 0;
}
.photo {
display: block;
width: 176px;
height: 158px;
text-align: center;
line-height: 158px;
margin-bottom: 10px;
}
a {
display: inline-block;
position: relative;
line-height: 0;
}
img {
border: none;
vertical-align: middle;
}
ins {
background: url('/images/badge.png') no-repeat 0 0;
position: absolute;
left: 0;
top: 0;
width: 20px;
height: 20px;
}
Example:
In previous less successful attempts (see edit history), the problem was getting the image vertically centered ánd to get its parent the same size (in order to position the badge in the top-left of that parent). As inline element that parent doesn't care about the height of its contents and thus remains to small, but as block element it stretches to hís parent's size and thus got to high, see demonstration fiddle. The trick seems to be to give that parent a very small line-height (e.g. 0) and display it as an inline-block. That way the parent will grow according to its childs.
Tested in Opera 11, Chrome 11, IE8, IE9, FF4 and Safari 5 with all DTD's. IE7 fails, but a center-top alignment of the photo with badge at the right position isn't that bad at all. Works also for IE7 now because I deleted the spaces in the markup within the a tag. Haha, how weird!
EDIT3: This solution is very similar to my original solution. I didn't really look at your code much so I should have noticed this earlier. Your a tag is already wrapping each image so you can just add the badge in there and position it absolute. The a tag doesn't need width/height. Also you must add the badge image at the beginning of your a tag.
Demo: http://jsfiddle.net/wdm954/czxj2/1/
div.free_tile {
width: 176px;
height: 206px;
float: left;
}
a.img_container {
display: block;
margin-bottom: 10px;
}
span.transect_badge {
display:block;
position: absolute;
height: 20px;
width: 20px;
background-image: url('/images/transect-badge.png');
}
HTML...
<a class="img_container canonical" href="/photos/10">
<span class="transect_badge"></span>
<img class="canonical" src="path/to/img" />
</a>
Other solutions...
In my code I'm using SPAN tags so simulate images, but it's the same idea. The badge image, when positioned absolute, will create the desired effect.
Demo: http://jsfiddle.net/wdm954/62faE/
EDIT: In the case that you need jQuery to position. This should work (where .box is your container and .corner is the badge image)...
$('.box').each(function() {
$(this).find('.corner')
.css('margin-top', ( $(this).width() - $(this).find('.img').width() ) / 2);
$(this).find('.corner')
.css('margin-left', ( $(this).height() - $(this).find('.img').height() ) / 2);
});
EDIT2: Another solution would be to wrap each image with a new container. You would have to move the code that you use to center each image to the class of the new wrapping container.
Demo: http://jsfiddle.net/wdm954/62faE/1/
$('.img').wrap('<span class="imgwrap" />');
$('.imgwrap').prepend('<span class="badge" />');
Technically you can just add something like this to your HTML though without using jQuery to insert it.
Use an element other than <div>, e.g. <span> and put it inside your <a> element after the <img> element. Then, give the <a> element position:relative; and the <span> gets position:absolute; top:0px; left:0px;. That is, if you don't mind the badge also being part of the same link - but it's the easiest way. Also, the reason for using <span> is to keep your HTML4 valid, <div> would still be HTML5 valid, however.
I did find one solution using jQuery. I don't prefer this because it noticably impacts page loading, but it is acceptable if nothing else will work. I'm more interested in NGLN's idea which seems promising but I haven't entirely figured out yet. However, since this thread has picked up a lot of traffic I thought I'd post one solution that I came up with for future readers to consider:
Given this markup:
<div class="free_tile">
<a class="img_container canonical" href="/photos/10">
<img class="canonical" src="http://s3.amazonaws.com/t4e-development/photos/1/10/andrew_burleson_10_tile.jpg?1303238025" alt="Andrew_burleson_10_tile">
<span class="transect-badge"></span>
</a>
<div class="location">Houston</div>
<div class="taxonomy"> T6 | Conduit | Infrastructure </div>
</div>
Same CSS as in question except:
span.transect-badge { display: block; height: 20px; width: 20px; position: absolute; background: url('/images/transect-badge.png'); }
Then this jQuery solves the problem:
$(function() {
$('img.canonical').load( function() {
var position = $(this).position();
$(this).next().css({ 'top': position.top+1, 'left': position.left+1 });
});
});
Like I said, though, this incurs noticeable run-time on the client end, so I'd prefer to use a non JS solution if I can. I'll continue to leave this question open while I test out and give feedback on the other solutions offered, with hopes of finding one of them workable without JS.
I have an image which may have some divs over it (specifying certain selections within that image). These divs are supposed to be clickable. Something like that:
#divOuter { width: 500px; height: 500px; border: 2px solid #0000FF; position: relative; }
#divInner { width: 100px; height: 100px; border: 2px solid #00FF00; position: absolute; cursor: pointer; top: 20px; left: 20px; }
<div id="divOuter">
<img src="SomeImage.jpg" />
<div id="divInner"></div>
</div>
$("#divOuter").click(function() { alert("divOuter"); });
$("#divInner").click(function() { alert("divInner"); });
In chrome and FF it works as expected (pointer appears over the div, and clicking it alerts "divInner" and then "divOuter").
However, in IE8 it didn't - I got the same behavior only when hovering/clicking on the inner div borders. When clicking inside that div, only "divOuter" was alerted.
How can this be fixed?
Here's a hack: add an CHAR like "O" to the inner div, and then give it an enormous font size(depends on the area you want to span over):
#divInner { /* ... */; font-size: 1000px; color: transparent; }
(Also set "overflow: hidden" I think.)
IE likes there to be something there in the container for the click to affect. If it's just completely empty, it ignores clicks.
a fiddle: https://jsfiddle.net/cbnk8wrk/1/ (watch in IE!)
I had the same problem with an unordered list, see Getting unordered list in front of image slide-show in IE8, IE7 and probably IE6
The solution : give the div a background color and make it transparent with a filter.
Adding an 1x1 px transparent background gif to the div is also working.
#divInner { background: url(/images/transparent.gif); }