Highlighting images on mouse enter - javascript

I have 4 images which will be thumbnails for news articles. When the user moves their mouse over one of the images I want it to highlight. I have done this by placing a div of the same size over the image. I then tried to use JQuery to add a class to that div on mouse enter which would make it a slightly see through blue box as shown here.
HTML:
<div class="col-5 parent-center">
<div id="news1" class="news-highlight"></div>
<img src="images/news.jpg" class="news-image"/>
</div>
I know that in the JQuery I use .content as a reference to find the IDs of the news images faster. That does exist I just didn't copy in that far up the code because it would have resulted in a lot of code unrelated to my problem being pasted in.
CSS:
.news-image
{
height: 100%;
width: 90%;
border: solid 2px #14a0dc;
}
.news-highlight
{
height: 100%;
width: 90%;
position: absolute;
background-color: #14a0dc;
opacity: 0.6;
}
JQuery:
function highlightNews(newsDiv)
{
newsDiv.addClass('news-highlight');
}
function unhighlightNews(newsDiv)
{
newsDiv.removeClass('news-highlight');
}
$(document).ready(function()
{
var $content = $('.content');
var $news1 = $content.find('#news-1');
var $news2 = $content.find('#news-2');
var $news3 = $content.find('#news-3');
var $news4 = $content.find('#news-4');
function newsMouse(newsDiv)
{
newsDiv.on('mouseenter', highlightNews(newsDiv)).on('mouseleave', unhighlightNews(newsDiv));
}
newsMouse($news1);
newsMouse($news2);
newsMouse($news3);
newsMouse($news4);
});
Now you're probably crying after seeing my JQuery, I'm trying to learn it on the fly so I don't really know what I'm doing.
Thanks in advance :)

Why don't you make it with pure css without nothing of js?
.news-image
{
height: 100%;
width: 90%;
border: solid 2px #14a0dc;
}
.news-image:hover
{
height: 100%;
width: 90%;
position: absolute;
background-color: #14a0dc;
opacity: 0.6;
}
<div class="col-5 parent-center">
<div id="news1" class="news-highlight"></div>
<img src="images/news.jpg" class="news-image"/>
</div>

you can do this using pure CSS. basically highlighting is nothing but box-shadow or border on the hover.
.news-image:hover{
border:solid 1px red;
}

If you want to use JQuery to do something like this, one option is to use hover and toggleClass
$('.news-image img').hover(function() {
$(this).toggleClass('news-highlight');
});
.news-image {
float: left;
width: 33.3%;
padding: 5px;
box-sizing: border-box;
}
.news-image img{
transition: all 0.3s ease-in;
width: 100%;
}
.news-highlight {
opacity: 0.6;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="news-image">
<img src="http://placehold.it/350x150">
</div>
<div class="news-image">
<img src="http://placehold.it/350x150">
</div>
<div class="news-image">
<img src="http://placehold.it/350x150">
</div>

If I understand what you want correctly, you should just need to change the colour of the div on top of your images when they are hovered on. This can easily be done with CSS. This should work:
.news-highlight
{
background: rgba(51, 153, 255, 0);
}
.news-highlight:hover
{
background: rgba(51, 153, 255, 0.5);
}
This will give the div a semi-transparent blue colour when the user hovers the cursor over it, and the image will show through.
You could also change the images to a greyscale at the same time, which may improve the effect.
EDIT: I should have also stated that you need to change the order of your html to this:
<div class="col-5 parent-center">
<img src="images/news.jpg" class="news-image"/>
<div id="news1" class="news-highlight"></div>
</div>
now the .news-highlight div will appear on top of your img.

Here is jsFiddle how does hover effect work. Practice is the answer! jQuery not required for something this simple
.news-image
{
height: 100%;
width: 90%;
border: solid 2px #14a0dc;
}
.news-image:hover
{
height: 100%;
width: 90%;
position: absolute;
background-color: #14a0dc;
opacity: 0.6;
}

Related

Make bar/progress chart with JS and CSS [closed]

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If I have data like displayed on top of the image. Is it posible to make a diagran like this (picture), with pure JS, CSS and HTML? I dont know what a diagram/chart like this is called. Any help is greatly appreciated!
The most straightforward approach is to use an absolutely positioned child in a relatively positioned parent and set its width as the progress.
function setProgress(percent) {
const range = document.querySelector('.range');
const progress = range.querySelector('.progress');
progress.style.width = `${percent}%`
}
setProgress(70);
.range {
position: relative;
height: 20px;
background-color: #ed3a23;
border: 2px solid #000;
box-sizing: border-box;
overflow: hidden;
}
.progress {
position: absolute;
left: 0;
top: 0;
width: 0;
height: 100%;
background-color: #4db24c;
border-right: 3px solid #000;
}
<div class="range">
<div class="progress"></div>
</div>
You don't need JavaScript.
Pass a CSS var() from HTML to CSS and use calc() to get the percentages
Using background linear gradient
.progress {
background: green;
height: 2em;
background: linear-gradient(to right, green calc(var(--val) * 10%), red calc(var(--val) * 10%));
background-size: 100%;
}
<div class="progress" style="--val:1"></div><br>
<div class="progress" style="--val:7"></div><br>
Using CSS pseudo element ::before
.progress {
background: red;
height: 2em;
}
.progress::before {
content: "";
display: block;
height: inherit;
background: green;
width: calc(var(--val) * 10%);
}
<div class="progress" style="--val:1"></div><br>
<div class="progress" style="--val:7"></div><br>
Here's pure HTML & CSS
.bar-wrap {
display: flex
}
.col {
display: block;
text-align:center;
width: var(--size)
}
.bar {
height: 50px;
width: 100%;
border: 3px solid #000;
background: var(--background)
}
.cgreen {
color: green
}
.cred {
color: red
}
<div class="bar-wrap">
<div class="col cgreen" style="--size:70%;">
<h3 class="heading">Correct</h3>
<div class="bar" style="--background:green"></div>
<p class="label">70%</p>
</div>
<div class="col cred" style="--size:30%;">
<h3 class="heading">Wrong</h3>
<div class="bar" style="--background:red"></div>
<p class="label">30%</p>
</div>
</div>
To meet accessibility and semantic code standards, I'd recommend having a look into the HTML <meter> element (official specification with all the attributes). Or you just have a look on HTML5 doctor to get a more compact/short conclusion.
However, keep in mind that according to caniuse.com, legacy browsers like Edge 12 and others don't support this HTML tag. So if you want to support these older browsers, that are listed there as non-supporting, you would need to come up with a fallback solution.
Rough code example for a fallback solution
<div class="meter-wrapper">
<div class="meter" style="width: 70%;">
<!-- `hidden` attribute to hide the text content but keeping the element accessible for screen readers. -->
<p class="meter__text-fallback meter__text-fallback--correct"><strong>70%</strong><span hidden>of given answers are correct.</span></p>
</div>
<p class="meter__text-fallback meter__text-fallback--incorrect"><strong>30%</strong><span hidden>of given answers are incorrect.</span></p>
</div>
and style it something like this:
/* CSS */
.meter-wrapper {
background-color: pink;
height: 40px;
position: relative;
}
.meter {
display: inline-block;
background-color: MediumAquamarine;
height: 100%;
position: relative;
}
.meter__text-fallback {
position: absolute;
margin: 0;
bottom: -25px;
}
/* This class block is not utterly necessary, since the default value for `left` is already `0`. Just in case you want to have different values. */
.meter__text-fallback--correct {
left: 0;
}
.meter__text-fallback--incorrect {
right: 0;
}
See this code example in action
Link to codepen
Important notes to this code example
I would recommend to change your layout from having the percentage of correct and incorrect answers outside the meter bars to avoid a case, where you would have a slimmer bar than the width of the typography overlapping it.
Setting the values for the style="width: 70%" attributes would need to be controlled via JS.
It is also arguable to style HTML elements with inline styles, like I did in this example. On the other hand creating a 100+ different CSS classes for such a case, might be overkill. Styling via data attributes is also not fully supported. So I'll leave this decision up to you.

Could background-color have different z-index than img?

I need to one image overlap an another. But the second image have background color and I need the first image between the second and second's background-color. It is possible? Already tried to made a new "div class" instead of style="background-color". Now i am stuck with this:
.mainRunner {
position: relative;
}
.firstimage {
position: relative;
z-index: 2;
}
.secondimage {
position: relative;
z-index: 3;
top: -75px;
}
.background {
position: relative;
z-index: 1
}
<div class="firstimage" style="max-width: 1170px;"><img src="" alt="" title="" style="width: 100%;" max-width="1168" height="399" caption="false" /></div>
<div class="background" style="background-color: #f2e5df;">
<div class="secondimage">
<img src="" alt="" title="" />
</div></div>
You can't give certain properties of an element different z-index values. However for certain elements like a div you can use ::before and ::after pseudo elements. And you can set a z-index on those, effectively creating three layers. More information here.
In this case you can create a div with the middle img inside. Then add a ::before and ::after to that div. Giving one a background color and a z-index of -1. And the other a background image and a z-index of 1.
In the example below I also added some margin and a border around the inital div so you can better see what is going on.
.image {
margin: 20px 0 0 20px;
position: relative;
border: 3px solid coral;
width: 200px;
height: 300px;
}
.image::before,
.image::after {
content: '';
display: block;
width: 200px;
height: 300px;
position: absolute;
}
.image::before {
z-index: -1;
background: cornflowerblue;
top: 20px;
left: 20px;
}
.image::after {
z-index: 1;
background: url("https://www.fillmurray.com/200/300");
top: -20px;
left: -20px;
}
<div class="image"><img src="https://www.fillmurray.com/200/300" /></div>
If I understand right what you're trying to achieve, you probably should be placing the images within background div and placing the second image with position: absolute:
<style>
.mainRunner {
position: relative;
}
.firstimage {
position: relative;
z-index: 2;
}
.secondimage {
position: absolute;
z-index: 3;
top: 20px; /* use top and left values to place the image exactly where you want it over the first image */
left: 20px
}
.background {
position: relative;
z-index: 1;
background-color: #f2e5df;
}
</style>
<div class="mainRunner">
<div class="background">
<img src="image1.png" class="firstimage" />
<img src="image2.png" class="secondimage " />
</div>
</div>
It sets the background color as the back-most element, then on top of it the secondimage and the firstimage.
Thank everyone for their ideas. In the end the solution was simple. In the style was the double definition of second image. And the first of them was just partly commented. So my first post working right like this:
.secondimage img{
max-width: 100%;
height: auto;
position: relative;
top: -75px;
margin: 5px;
margin-bottom: 10px;
}
Now just need to find out how to close this question...
Thank you :)
The answer is simply no... there is no way to address a z-index to specifically a background of an element, z-index and all the other CSS properties work on the entire element, not on only its background.
You're going to have to find another way to do this, have you thought of using a div with not content, and the same size of the image, and then just setting a background color to that specific div?

How to replace the white in an image using Javascript?

Pinterest (here is an example) and some other sites replace the white in their images with a gray color. They do that for all of their images and it seems to be on the client side.
Is this possible using Javascript, or is there another way they are doing this?
Here's a quick & dirty example that might help get you started:
$('#container').on("mouseenter mouseleave", () => {
$('.overlay').toggle();
});
#container {
display: inline-block;
position: relative;
}
.overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: black;
opacity: .25;
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id='container'>
<img src="http://imagizer.imageshack.com/v2/600x742q90/537/xAgiLR.jpg" width="200px" height="247px">
<div class="overlay" />
</div>

How to make a page "lights out" except for one element

I'm not really asking for help with my code, I'm more asking, how do you do this?
When you click my div, the screen goes black, but I want my div underneath to still show as normal, but the rest of the area to be blacked out.
function lightsout() {
document.getElementById("lightsout").style.visibility = "visible";
}
<div style="width:100px;height:100px;border:2px solid blue" onclick="lightsout()">Click Me</div>
<div id="lightsout" style="position:fixed;top:0;left:0;width:100%;height:100%;background-color:black;visibility:hidden;">
You can use the box-shadow property to achieve this effect.
Updated the Code
function lightsout() {
document.getElementById("maindiv").classList.toggle("visible");
}
.visible{
box-shadow: 0 0 0 10000px #000;
position: relative;
}
body{
color: red;
}
<div style="width:100px;height:100px;border:2px solid blue; color: #000;" onclick="lightsout()" id="maindiv">Click Me</div>
Other elements on the page will be hidden...
You can simply add z-indexes to your positioning. With giving the black area a lower z-index than your button but a higher z-index than the rest, you will have your effect.
Also it is recommended to not use inline styles, as your code becomes way more maintainable with styles and markup seperate.
function lightsout() {
document.getElementById("lightsout").classList.toggle("visible");
}
.button {
position: relative;
z-index: 10;
width: 100px;
height: 100px;
border: 2px solid blue;
background: white;
}
#lightsout {
position: fixed;
z-index: 5;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: gray;
visibility: hidden;
}
#lightsout.visible {
visibility: visible
}
<div class="button" onclick="lightsout()">Click Me</div>
<div id="lightsout"></div>
Other elements are hidden.
you can use css,
z-index, and add divbox background-color like this :)
function lightsout() {
document.getElementById("lightsout").style.visibility = "visible";
}
#lightsout{
z-index: -1
}
<div style="width:100px;height:100px;border:2px solid blue;background-color:white;" onclick="lightsout()">Click Me</div>
<div id="lightsout" style="position:fixed;top:0;left:0;width:100%;height:100%;background-color:black;visibility:hidden;">http://stackoverflow.com/questions/42688925/how-to-make-a-page-lights-out-except-for-one-element#

Can I use jquery to on image hover fade on load text to new text dependent on each image

I have 6 images that when hovered on I would like there corresponding text to fadeIn in the same position one overtaking the other on each image hover.
I am able to show/hide on hover but I am unable to get each element to remove when a new image is hovered.
I have been working on a fiddle here http://jsfiddle.net/PvVg9/
I am new to jquery and the help would really be appreciated.
$('.trigger').hover(function() {
$('.hide').fadeOut(function() {
$('.panel').fadeIn();
});
});
$('.trigger-two').hover(function() {
$('.hide').fadeOut(function() {
$('.panel-two').fadeIn();
});
});
No need for jQuery if you are happy to use CSS3:
JSFIDDLE
HTML
<div class="trigger">Image 1<div class="panel">SHOW ME 1</div></div>
<div class="trigger">Image 2<div class="panel">SHOW ME 2</div></div>
<div class="trigger">Image 3<div class="panel">SHOW ME 3</div></div>
<div class="trigger">Image 4<div class="panel">SHOW ME 4</div></div>
<div class="trigger">Image 5<div class="panel">SHOW ME 5</div></div>
<div class="trigger">Image 6<div class="panel">SHOW ME 6</div></div>
CSS
.panel,
.trigger {
width: 100px;
height: 20px;
margin: 2px;
}
.trigger {
position: relative;
background: grey;
border: 1px solid black;
}
.panel {
position: absolute;
left: 100%;
top: -3px;
background-color: red;
border: 1px solid darkred;
visibility:hidden;
opacity: 0;
transition: visibility 0.1s linear 0.5s,opacity 0.5s linear;
}
.trigger:hover .panel {
visibility:visible;
opacity:1;
transition-delay:0s;
}
Or if you want them one on top of the other then: JSFIDDLE
I do not understand what you want, I guess a tooltip JQuery plug may fit your need.
Check this tool.
I also update your example, you can have a look at it jsfiddle.net/PvVg9/154/

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