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How to prevent Read More/Read less button to jumping to the bottom?

I've created a button for Read More/Read Less functionality but when I'm clicking on the show less it jumps to the bottom. Could you please tell me how to fix this?...it should go to the same position...I'm using oxygen builder (code for this [ https://codepen.io/nick7961/pen/qByYMXZ?editors=0010
])

One way of doing this is to grab the current scroll y value and divide it by the body height to get the scroll position as a percentage. You'll have to do this in the event listener, before changes are made. In my function, setScroll, you can get the new body height and multiply it by the percentage you grabbed earlier, to keep the scroll in the same relative position.
button.addEventListener('click', () => {
const defaultValue = {
element: arrowIcon,
currentIcon: 'fa-chevron-down',
newIcon: 'fa-chevron-up',
};
//show content
if (initial.showAllContent){
showButton(buttonShowLess);
showButton(buttonShowMore, false);
content.classList.remove('gradientContent', 'maxContentHeight');
}else{
let relativeScroll = window.scrollY / document.body.clientHeight;
showButton(buttonShowLess, false);
showButton(buttonShowMore);
defaultValue.currentIcon = 'fa-chevron-up';
defaultValue.newIcon = 'fa-chevron-down';
content.classList.add('gradientContent', 'maxContentHeight');
setScroll(relativeScroll);
}
changeIcon(defaultValue);
initial.showAllContent = !initial.showAllContent;
});
function setScroll(relativeScroll) {
let scrollValue = document.body.clientHeight * relativeScroll;
window.scroll(0, scrollValue);
}
If you wanted to bounce the user back to the top, you could simply use:
window.scroll(0, 0);

How to change the cursor on an image on mouse move

In an Angular 7 application, I'm trying to implement left and right arrows for an image slideshow. If the mouse is hovered on the left half of the image, it should show a left arrow, and a right arrow on the right half. Clicking the image then will take the user to either the next or previous image in the array of images. Something like this: https://wells-demo.squarespace.com/human-nature-wells/uml9t64gkm48jijkt8y6slmtd0jush
<img src="url" (click)="navigate()">
I tried to set up something with #HostListener, but can't quite figure out how to progress.
urls = [url1, url2, url3, ....url10];
currIndex = 2;
url = urls[currIndex];
#HostListener('mousemove', ['$event'])
onMouseMove(event: MouseEvent) {
//console.log(event.pageX);
//console.log(this.el.nativeElement.offsetLeft);
//not completely sure what to do here...
}
navigate() {
if (leftHalf) { //how to figure this out?
prevImage();
} else {
nextImage();
}
nextImage() {
this.url = this.urls[this.currIndex + 1];
}
prevImage() {
this.url = this.urls[this.currIndex - 1]
}
1) How do I change the mouse cursor to a left arrow based on the position?
2) How to detect if left half or right half was clicked on?
Appreciate any help I can get on this!

Make use of offsetWidth of the element and offsetX of the mousemove event.
if(event.offsetX > element.offsetWidth / 2) {
// right half
} else {
// left half
}
To change the pointer's you have to make use of add/remove class using the cursor property. Refer this https://css-tricks.com/using-css-cursors/

check out the below code for adding arrows as per your requirement
.left_div{
cursor:w-resize;
float:left
}
.right_div{
cursor:n-resize;
float:right
}
<div class="left_div">this is left div</div>
<div class="right_div">this is right div</div>

Create a wiggle effect for a text

So what I want to happen is that when viewing the Span the text is normal but as you scroll down it starts moving until it looks like such:
Before the effect:
While the effect occurs:
The header is represented by spans for each letter. In the initial state, the top pixel value for each is 0. But the idea as mentioned is that that changes alongside the scroll value.
I wanted to keep track of the scroll position through JS and jQuery and then change the pixel value as needed. But that's what I have been having trouble with. Also making it smooth has been another issue.

Use the mathematical functions sine and cosine, for characters at even and odd indices respectively, as the graphs of the functions move up and down like waves. This will create a smooth effect:
cos(x) == 1 - sin(x), so in a sense, each character will be the "opposite" of the next one to create that scattered look:
function makeContainerWiggleOnScroll(container, speed = 0.01, distance = 4) {
let wiggle = function() {
// y-axis scroll value
var y = window.pageYOffset || document.body.scrollTop;
// make div pseudo-(position:fixed), because setting the position to fixed makes the letters overlap
container.style.marginTop = y + 'px';
for (var i = 0; i < container.children.length; i++) {
var span = container.children[i];
// margin-top = { amplitude of the sine/cosine function (to make it always positive) } + { the sine/cosine function (to make it move up and down }
// cos(x) = 1 - sin(x)
var trigFunc = i % 2 ? Math.cos : Math.sin;
span.style.marginTop = distance + distance * trigFunc(speed * y)/2 + 'px';
}
};
window.addEventListener('scroll', wiggle);
wiggle(); // init
}
makeContainerWiggleOnScroll(document.querySelector('h2'));
body {
height: 500px;
margin-top: 0;
}
span {
display: inline-block;
vertical-align: top;
}
<h2>
<span>H</span><span>e</span><span>a</span><span>d</span><span>e</span><span>r</span>
</h2>
Important styling note: the spans' display must be set to inline-block, so that margin-top works.

Something like this will be the core of your JS functionality:
window.addEventListener('scroll', function(e) {
var scrl = window.scrollY
// Changing the position of elements that we want to go up
document.querySelectorAll('.up').forEach(function(el){
el.style.top = - scrl/30 +'px';
});
// Changing the position of elements that we want to go down
document.querySelectorAll('.down').forEach(function(el){
el.style.top = scrl/30 +'px';
});
});
We're basically listening in on the scroll event, checking how much has the user scrolled and then act upon it by offsetting our spans (which i've classed as up & down)
JSBin Example
Something you can improve on yourself would be making sure that the letters wont go off the page when the user scrolls a lot.
You can do this with simple math calculation, taking in consideration the window's total height and using the current scrollY as a multiplier.
- As RokoC has pointed out there is room for performance improvements.Implement some debouncing or other kinds of limiters

jQuery image slider using an increment/decrement

Im trying to create a slider that uses an increment/decrement to move and then hide or show the buttons depending on the max number of images in the row. It uses a div within a div, with an overflow of hidden that should move until the max number of images is hit, this is when the arrow should be hidden so the person cannot just keep going into the white space created by the overflow. However, the hide/shows do not work and the person can just keep incrementing because the arrow is still visible even after the max number of images has been reached.
How do I get the left and right arrows to hide when they hit the respective numbers?
Edit: i know the .css is messed-up, i just want to get the arrows to hide/ show first, thanks
var pressCounter = 0;
var maxImgCounter = $('.carousel-image').length; // gain the max amount of images
var maxSlide = maxImgCounter - 4;// - the amount of images visible on the screen so it does notshow white space
if ( pressCounter < maxSlide){
$('#right').show();
}else{
$('#right').hide();
}
if (pressCounter > 0){
$('#left').show();
}else{
$('#left').hide();
}
/* Left arrow */
$('#left').click(function(){
$( '.slide' ).css({
"position": "relative",
"right": -280 * pressCounter
});
pressCounter--;
return pressCounter;
});
/* Right arrow */
$('#right').click(function(){
$( '.slide' ).css({
"position": "relative",
"right": 280 * pressCounter
});
pressCounter++;
return pressCounter;
});

if ( pressCounter < maxSlide){
$('#right').show();
}else{
$('#right').hide();
}
if (pressCounter > 0){
$('#left').show();
}else{
$('#left').hide();
}
Consider what happens when the value is less than maxslide and presscounter is greater than zero. Pretty much, this condition will always be true the way you have it written so both if statements are firing each time - one after the other. The result is that your left and right arrows will always be displayed - allowing users to keep clicking past the last slide.

Adjust top position according to height of div with javascript

function jsiBoxAdjustTop()
{
var top
if ( jsiBox.preloadImg.height <= 699){
top = 216;
}
else{
top = 17;
}
jsiBox.boxNode.style.top = (top) + 'px';
}
I'm using that function to adjust a div's top position depending on the image that is in it's height. It's on a light box sort of script so every time I click the next button, a new image which could either be taller or smaller appears. It's working alright and it adjusts its position when the image is taller but my problem is it just jumps to that position. I'm really new to javascript so can anyone help me out to make this as if it's travelling/animating to it's position? I tried using setTimeOut but I think I was doing it wrong. I'd really love to know what I'm doing wrong.
Here's the full script if that helps. Link

you can use jQuery or YUI to do animate, such as
jQuery(jsiBox.boxNode).animate({'top': top}, 3000);
or you can write some simple code with setTimeout just for this case;
following code assume the begin top is 0.
var boxStyle = jsiBox.boxNode.style;
function animateTop(to) {
boxStyle.top = parseInt(boxStyle.top, 10) + 1 + 'px';
if (parseInt(boxStyle.top, 10) != to) {
setTimeout(function() {
animate(to);
}, 50);
}
}
animateTop(top);