Develop Reference

Scroll to top button visible only on desktop (no mobile)

I made a scroll to top button that appears when the user scrolls down 25px from the top of the document (otherwise it's not visible) thanks to JavaScript following a tutorial because I still don't know anything about this programming language.
However, I would like it to be visible only on desktop websites and not also on mobile.
I tried using media queries but they don't work since JavaScript has control over the visibility of the button.
What function can I integrate to manage everything with JS?
Here is the code I'm using.
let myButton = document.getElementById("to-top-container");
window.onscroll = function() {
scrollFunction()
};
function scrollFunction() {
if (document.body.scrollTop > 25 || document.documentElement.scrollTop > 25) {
myButton.style.display = "block";
} else {
myButton.style.display = "none";
}
}
#to-top-container {
position: fixed;
bottom: 30px;
right: 3px;
}
.to-top-button {
background-color: #263238;
min-height: 40px;
min-width: 40px;
border-radius: 20px;
text-decoration: none;
display: flex;
justify-content: center;
align-items: center;
box-shadow: 2px 4px 5px rgb(0 0 0 / 30%);
/* animation: Up 2.3s infinite; */
}
#to-top-container .lni {
font-size: 14px;
font-weight: 900;
color: white;
}
<div id="to-top-container">
<a href="#body-container" title="Torna su" class="to-top-button">
<i class="lni lni-chevron-up"></i>
</a>
</div>

There is a JS way to detect if a media query is matched: this is done by using window.matchMedia(). Then it is a matter of adding the appropriate media query to matchMedia() function, and then checking the .matches property in your if block:
let myButton = document.getElementById("to-top-container");
window.onscroll = function() {
scrollFunction()
};
function scrollFunction() {
const matchesMediaQuery = window.matchMedia('(min-width: 600px)');
if (matchesMediaQuery.matches && (document.body.scrollTop > 25 || document.documentElement.scrollTop > 25)) {
myButton.style.display = "block";
} else {
myButton.style.display = "none";
}
}
scrollFunction();
#to-top-container {
position: fixed;
bottom: 30px;
right: 3px;
}
.to-top-button {
background-color: #263238;
min-height: 40px;
min-width: 40px;
border-radius: 20px;
text-decoration: none;
display: flex;
justify-content: center;
align-items: center;
box-shadow: 2px 4px 5px rgb(0 0 0 / 30%);
/* animation: Up 2.3s infinite; */
}
#to-top-container .lni {
font-size: 14px;
font-weight: 900;
color: white;
}
<div id="to-top-container">
<a href="#body-container" title="Torna su" class="to-top-button">
<i class="lni lni-chevron-up"></i>
</a>
</div>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>

Just Add this css in your css file or if you are using bootstrap then add bootstrap media query to disable display in mobile
#media only screen and (max-width: 600px) {
#to-top-container {
display: none;
}
}

You don't need javaScript to do it, you should have used the "a" tag to jump to other pages. But the "a" tag can also jump to an element on the same page.
As defined in the HTML specification, you can use href="#top" or href="#" to link to the top of the current page.
The #media query is set to max-width: 600px - adjust the max-width to fit your needs.
html {
scroll-behavior:smooth;
}
body {
position: relative;
}
.section {
height: 100vh;
background: #dedede;
margin-bottom: 20px;
font-size: 100px;
}
.scroll-container {
position: absolute;
top: 0;
right:0;
height: 100%;
}
.scroll-container:before {
content: '';
display: block;
height: 100vh;
pointer-events: none;
}
.scroll-container a {
position: sticky;
top: 88vh;
cursor: pointer;
font-size: 20px;
}
#media (max-width: 600px) {
.scroll-container a {
display: none;
}
}
<div class="section">Section 1</div>
<div class="section">Section 2</div>
<div class="section">Section 3</div>
<div class="scroll-container">
To Top
</div>

how to place the "read more" text next to the end of truncated line- Javascript [duplicate]

This question already has answers here:
Generating ellipsis AND "Read more" link with CSS
(3 answers)
Closed 2 years ago.
I have a text that I have truncated using the css - height and overflow property.
.container {
width: 600px;
border: 1px solid #888;
padding: 0.5em;
line-height: 1.2em;
margin-bottom: 10px;
}
.summary {
height: 47px;
/* adjust based on line-height * rows desired */
overflow: hidden;
}
.ellipsis {
height: 0;
}
.ellipsis span {
background: white;
padding-left: 0.5em;
position: relative;
top: -1.2em;
left: 3.2em;
color: blue;
}
<div class="container">
<div class="summary">
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
</p>
<ul>
<li>test</li>
<li>test333</li>
</ul>
<strong>testststststs</strong>
</div>
<div class="ellipsis"><span>... Read more</span></div>
</div>
however my issue is when I try placing the "...read more" using he position relative property it does not work: ex below:
http://jsfiddle.net/ctges45w/3/
As you can see the above fiddle the text is floating in middle of the sentence.
http://jsfiddle.net/ctges45w/5/
how can I make sure that the "read more" text always get placed at the end of the line where its truncated regardless of the width of the content?- something like this:
http://jsfiddle.net/ctges45w/4/
I have tried looking up at sources on stack overflow with similar issue and those havent or partially worked for me: ex here:how to place " ...view more " text next to the truncated sentence in a container-Javscript
any ideas?

Forget all the relative positioning. Just simply put the readmore at the end of the text and style it as you wish.
let summary = document.querySelector('.summary')
if (summary.textContent.length > 100){
let truncated = summary.textContent.substring(0, 100)
summary.innerHTML = `<p style="margin:0;">${truncated}<span class='ellipsis'>... Read more</span></p>`
}
.container {
width: 600px;
border: 1px solid #888;
padding: 0.5em;
line-height: 1.2em;
margin-bottom: 10px;
}
.summary{
overflow: hidden;
height: 47px;
padding: 0;
}
.ellipsis{
color: blue;
}
<div class="container">
<div class="summary">
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
</p>
<ul>
<li>test</li>
<li>test333</li>
</ul>
<p>
<strong>testststststs</strong>
<span class="ellipsis">... Read more</span>
</p>
</div>
</div>

CSS simultaneous transition on multiple elements

So, I have 3 flexbox containers of the same dimension. When I click on one of them, it should stretch to become bigger then the others, and then back to normal if I click on it again.
I've made it using JS, and it works.
The problem is that when I already have one the boxes stretched and I try to stretch another one, the transition duration increases. And I can't figure out why. I thought the different transitions would start simultaneously.
This is the code:
/* HTML */
<div class="flexbox">
<div class="box-1" onclick="box1();">
<h3>Box 1</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
<div class="box-2" onclick="box2();">
<h3>Box 2</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
<div class="box-3" onclick="box3();">
<h3>Box 3</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
</div>
/* CSS */
.flexbox {
display: flex;
width: auto;
justify-content: center;
}
.flexbox div {
border: 1px #ccc solid;
border-radius: 10px;
width: 250px;
height: 250px;
padding: 10px;
margin: 2px 10px;
transition: flex-grow 1s linear 0s;
}
.box-1{
flex-grow: 0;
}
.box-2 {
flex-grow: 0;
}
.box-3 {
flex-grow: 0;
}
/* JS */
function box1(){
const box1 = document.getElementsByClassName('box-1')[0];
if(box1.style.flexGrow != '4'){
box1.style.flexGrow = '4';
} else {
box1.style.flexGrow = '0';
}
const box2 = document.getElementsByClassName('box-2')[0];
box2.style.flexGrow = '0';
const box3 = document.getElementsByClassName('box-3')[0];
box3.style.flexGrow = '0';
}
function box2(){
const box2 = document.getElementsByClassName('box-2')[0];
if(box2.style.flexGrow != '4'){
box2.style.flexGrow = '4';
} else {
box2.style.flexGrow = '0';
}
const box1 = document.getElementsByClassName('box-1')[0];
box1.style.flexGrow = '0';
const box3 = document.getElementsByClassName('box-3')[0];
box3.style.flexGrow = '0';
}
function box3(){
const box3 = document.getElementsByClassName('box-3')[0];
if(box3.style.flexGrow != '4'){
box3.style.flexGrow = '4';
} else {
box3.style.flexGrow = '0';
}
const box1 = document.getElementsByClassName('box-1')[0];
box1.style.flexGrow = '0';
const box2 = document.getElementsByClassName('box-2')[0];
box2.style.flexGrow = '0';
}
How can I have the transition duration to be always the same (1s in this example)?

There are a number of improvements that can be made to your code that will reduce duplication, avoid complications of interacting with the live HTMLCollection that getElementsByClassName returns, allow you to avoid using inline onclick assignments, and will cause the transition to only take 1 second.
The example below implements a single grow() function which is called by listeners attached to each box. The listeners are added by iterating over the NodeList returned by querying the DOM with .querySelectorAll('.box') and calling addEventListener() on each element.
In the CSS we declare classes for each state we want our boxes to be able to have - in this case flex-grow: 0 and flex-grow:4. Then in our grow() function we simply add or remove these styles as necessary based on which box was clicked.
function grow(e){
// if the clicked box already has class 'flexgrow4' return
if (e.currentTarget.classList.contains('flexgrow4')) return;
// otherwise find the element in the flexbox container that has
// class 'flexgrow4' and replace it with 'flexgrow0'
const lastActive = flexbox.querySelector('.flexgrow4');
if (lastActive) lastActive.classList.replace('flexgrow4', 'flexgrow0');
// finally, replace 'flexgrow0' with 'flexgrow4' on the clicked box
e.currentTarget.classList.replace('flexgrow0', 'flexgrow4');
}
const flexbox = document.querySelector('.flexbox');
const boxes = document.querySelectorAll('.box')
boxes.forEach(box => box.addEventListener("click", grow, false));
.flexbox {
display: flex;
width: 100vw;
justify-content: center;
}
.flexbox div {
border: 1px #ccc solid;
border-radius: 10px;
width: 100px;
height: 250px;
padding: 10px;
margin: 2px 10px;
transition: all 1s linear 0s;
}
.flexgrow0 {
flex-grow: 1;
}
.flexgrow4 {
flex-grow: 4;
background-color:tomato;
}
<div class="flexbox">
<div class="box flexgrow0">
<h3>Box 1</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
<div class="box flexgrow0">
<h3>Box 2</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
<div class="box flexgrow0">
<h3>Box 3</h3>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore</p>
</div>
</div>

Image Slider Javascript won't work

I'm currently working on an image slider for my company's new homepage and just can't figure out the error that seems to lie in the javascript part ..
The slider contains 4 images and should, as soon as the last image is reached, begin at the first image again. The problem is that the images are displayed in that order "1-2-1-2-3-4-1-2-3-4..."
Here the code:
$('.slide').first().addClass('active');
$('.slide').hide();
$('.active').show();
$('#next').on('click', nextSlide);
$('#prev').on('click', prevSlide);
// Auto slider
if (options.autoswitch === true) {
setInterval(nextSlide, options.autoswitch_speed);
}
function nextSlide() {
$('.active').removeClass('active').addClass('prevActive');
if ($('.prevActive').is(':last-child')) {
$('.slide').first().addClass('active');
} else {
$('.prevActive').next().addClass('active');
}
$('.prevActive').removeClass('prevActive');
$('.slide').fadeOut(options.speed);
$('.active').fadeIn(options.speed);
}
function prevSlide() {
$('.active').removeClass('active').addClass('prevActive');
if ($('.prevActive').is(':first-child')) {
$('.slide').last().addClass('active');
} else {
$('.prevActive').prev().addClass('active');
}
$('.prevActive').removeClass('prevActive');
$('.slide').fadeOut(options.speed);
$('.active').fadeIn(options.speed);
}
});
and the corresponding CSS:
#slider-container {
height: 600px;
margin: 0 auto;
max-width: 100%;
overflow: hidden;
position: relative;
width: 800px;
}
#sldier {
height: 100%;
width: 100%;
}
#slider .slide img {
height: 100%;
width: auto;
}
#prev, #next {
cursor: pointer;
max-width: 30px;
opacity: 1;
position: absolute;
top: 8%;
-webkit-transition: opacity 0.2s linear;
-moz-transition: opacity 0.2s linear;
-o-transition: opacity 0.2s linear;
transition: opacity 0.2s linear;
z-index: 999;
}
#prev { left: 12px; }
#next { right: 3px; }
#slider-container:hover #prev, #slider-container:hover #next { opacity: .7; }
.slide {
position: absolute;
width: 100%;
}
.slide-copy {
background: #777;
background: rgba(0, 0, 0, .5);
bottom: 0;
color: #fff;
left: 0;
padding: 20px;
position: absolute;
}
#media (min-width: 600px) {
#prev, #next {
top: 45%;
}
}
and the HTML
<div id="slider-container">
<img src="img/arrowprev" id="prev" alt="prev">
<ul id="slider">
<li class="slide">
<div class="slide-copy">
<h2>Placeholder</h2>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.</p>
</div>
<img src="img/placeholder" alt="placeholder">
</li>
<li class="slide">
<div class="slide-copy">
<h2>Placeholder2</h2>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.</p>
</div>
<img src="img/placeholder" alt="placeholder">
</li>
<li class="slide">
<div class="slide-copy">
<h2>Placeholder3</h2>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.</p>
</div>
<img src="img/placeholder" alt="placeholder">
</li>
<li class="slide">
<div class="slide-copy">
<h2>Placeholder4</h2>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.</p>
</div>
<img src="img/placeholder" alt="placeholder">
</li>
</ul>
<img src="img/arrownext" id="next" alt="next">
</div>
Maybe it has something to do with
if ($('.prevActive').is(':first-child')) {
$('.slide').last().addClass('active');
I just can't figure out the problem and would appreciate any help.
Thank you in advance :)
This is the page I took as source:
https://www.jqueryscript.net/slider/Tiny-jQuery-Image-Slider-Slideshow-With-Caption-Support.html

I found the fail, the unique thing it wasn't working, is the apply of visibility on each prevActive and active elements on each next/prev actions, so I've added this lines to both functions:
$('.prevActive').hide();
$('.active').show();
(Also I've commented the lines referencing to options variable, as is not defined in the description).
You can see the fiddle working here:
https://jsfiddle.net/a4bssrf5/8/

Show more/less with effect

I found this code: link
$(".show-more a").on("click", function() {
var $this = $(this);
var $content = $this.parent().prev("div.content");
var linkText = $this.text().toUpperCase();
if(linkText === "SHOW MORE"){
linkText = "Show less";
$content.switchClass("hideContent", "showContent", 400);
} else {
linkText = "Show more";
$content.switchClass("showContent", "hideContent", 400);
};
$this.text(linkText);
});​
CSS:
div.text-container {
margin: 0 auto;
width: 75%;
}
.hideContent {
overflow: hidden;
line-height: 1em;
height: 2em;
}
.showContent {
line-height: 1em;
height: auto;
}
.showContent{
height: auto;
}
h1 {
font-size: 24px;
}
p {
padding: 10px 0;
}
.show-more {
padding: 10px 0;
text-align: center;
}
​
It was exactly what I was looking for, but as you can see here, if you modify it (link), the "Show more" link is there if you have only one or two lines, and it is not needed in that case.
Thank you for your answers!

As your sample code was not fully working I decided to enhance one of my own samples I created in a post a while ago.
DEMO - Show more/less and hide the link when not needed
The demo shows the first text to have no link and the second to have a link. If you add a few more characters to the first text you see the link appear when you run the fiddle again.
The idea is to double check the client vs the actual height and determine then if you want to show the link. Similar to the below.
$(".show-more a").each(function() {
var $link = $(this);
var $content = $link.parent().prev("div.text-content");
console.log($link);
var visibleHeight = $content[0].clientHeight;
var actualHide = $content[0].scrollHeight - 1; // -1 is needed in this example or you get a 1-line offset.
console.log(actualHide);
console.log(visibleHeight);
if (actualHide > visibleHeight) {
$link.show();
} else {
$link.hide();
}
});
The demo is using the following HTML:
<div class="text-container">
<h1>Lorem ipsum dolor</h1>
<div class="text-content short-text">
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut
labore Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt
</div>
<div class="show-more">
Show more
</div>
</div>
<div class="text-container">
<h1>Lorem ipsum dolor</h1>
<div class="text-content short-text">
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
</div>
<div class="show-more">
Show more
</div>
</div>​
and the following basic CSS:
div.text-container {
margin: 0 auto;
width: 75%;
}
.text-content{
line-height: 1em;
}
.short-text {
overflow: hidden;
height: 2em;
}
.full-text{
height: auto;
}
h1 {
font-size: 24px;
}
.show-more {
padding: 10px 0;
text-align: center;
}
​

See the working fiddle here - http://jsfiddle.net/tariqulazam/hpeyH/
First you have to measure if the content has overflowed or not. I have used the solution from detect elements overflow using jquery.
Finally use this plugin to decide whether to show or hide the 'show more' link.
$("div.content").HasScrollBar() ==true ? $(".show-more").show():$(".show-more").hide();

I don't know whats your real question is, but I suppose you want to deactive the show more link, if the text is only 1 or 2 lines and active it if the text has more than 2 lines.
For this purpose you have to check if the div with the text is bigger than you threshold (2 lines). In my solution I use the height() function which give you the height in pixel. In the original example the link text is not visible if the height is more than 2em.
You better should use also pixel for that or use a tool to convert the units.
Here are my addition lines for a solution with a threshold of 1 line:
var text = $('.text-container');
if (text.height() <= 20) {
$('.show-more').hide();
}
http://jsfiddle.net/JRDzf/

if( $('.text-container').html().indexOf("<br") >= 0 ) {
$(".show-more").hide()
}