I know how to fix the animation that goes down only when the image is showing up in the window with jQuery, but now I want to do that with JavaScript. Struggling with that. The image must be fluently go down (+50px for 1.6 seconds). Have googling around, but most of them are done with jQuery I suggest and that is not what I want. Furtermore the animation should start when the scrollTop is between 600px and 800px.
function scrollFunction() {
var animate = document.getElementById("picture");
var position = 0;
var top = 0;
var scrollTop = window.pageYOffset || document.documentElement.scrollTop;
if(scrollTop > 600 && scrollTop < 800){
position++;
animate.style.top = position + "50px";
} else {
stop();
}
}
function stop() {
clearTimeout(animate);
}
#picture {
width: 100%;
height: auto;
top: -5px;
position: relative;
display: block;
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
}
<div class="col-sm-12 col-xs-12">
<h1 class="responsive-h1">Mi<span class="logo-orange"> Pad2</span></h1>
<p class="edition-title above-text-black">Black Edition</p>
<img src="Img/picture.jpg" id="picture"/>
</div>
jsFiddle : https://jsfiddle.net/n1q3fy8w/
Javascript
var imgSlide = document.getElementById('slidedown-image');
var slideDown = setInterval(function() {
var topVal = parseInt(window.getComputedStyle(imgSlide).top, 10);
imgSlide.style.top = (topVal + 1) + "px";
}, 15);
setTimeout(function( ) { clearInterval( slideDown ); }, 1600);
You get the element first, after that you setup a setInterval which will basically move our img downwards, we then also set a setTimeout which after 1600ms remvoes the slideDown interval and the image stops. Your image however may need position: absolute.
The above answer will only work in Chrome, this however should work in all browswers
jsFiddle : https://jsfiddle.net/n1q3fy8w/1/
javascript
var imgSlide = document.getElementById('slidedown-image');
var slideDown = setInterval(function() {
var topVal = parseInt(imgSlide.style.top, 10);
imgSlide.style.top = (topVal + 1) + "px";
}, 15);
setTimeout(function( ) { clearInterval( slideDown ); }, 1600);
Ok so getComputedStyle only works in chrome, so to get this to work on all other browsers, you have to specifically set the css property on the element and not via CSS.
When you use javascript to access an element and change its style like so element.style.bottom = '150px' the .style gets you all of the css values for your inline styles on that element, so any css changes on an element that is done via a .css/.less file you can't access via javascript.
So all the above code does is we set a top: 0 on the element itself and in our code we use imageSlide.style.top instead of chrome's window.getComputedStyle
Have you considered using a CSS transition? if you are changing the value of top you should be able to add transition: top 1.6s in your css (to picture). (Then the vendor prefixed versions when you get it working)
Related
On the website (please don't share), in WordPress, I set a sticky header using CSS
header#masthead {
position: sticky;
top: 0;
left: 0;
right: 0;
z-index: 10000;
}
This works correctly. However, the image in the header is too big, that's why I resized it with an animation when scrolling down
jQuery(document).ready(function() {
jQuery(function() {
var $nav = jQuery('#masthead .custom-logo');
var height_original = jQuery('#masthead .custom-logo').css("height").replace("px","");
var height_small = height_original * 0.666;
var width_original = jQuery('#masthead .custom-logo').css("width").replace("px","");
var width_small = width_original * 0.666;
jQuery(document).scroll( function() {
var value = jQuery(this).scrollTop();
if ( value > 0 ){
$nav.stop().animate({height:height_small,width:width_small},100);
} else if (value == 0 ) {
$nav.stop().animate({height:height_original,width:width_original},100);
}
});
});
});
But, it doesn't work properly.
I primarily use Opera GX, where it behaves like this - when scrolling down, the animation is slowed down. Also, if you just scroll down a little, the animation doesn't run all the way and the image goes back to its original size, scrolling up works without a problem.
The strange thing is that I've also tried it in Firefox, Chrome and Edge. It behaves differently in everyone, but nowhere does it work 100% correctly.
What is wrong with the code please?
Thank you
I think instead of that long jquery code you can use this simple javascript code with some css to get the results you want:
I hope this helps you to reach what you looking for :)
JS
// Add a class to the header when scrolling
let header = document.querySelector('header');
window.addEventListener('scroll' , function () {
let window_top = this.scrollY;
if (window_top == 0) {
header.classList.remove('resize');
}else {
header.classList.add('resize');
}
});
CSS
/* these are the default styles (when the user doesnt scroll down yet) */
header#masthead {
position: sticky;
top: 0;
left: 0;
right: 0;
z-index: 10000;
transition: .3s;
}
header#masthead img{
transition: .3s; /*here i added transition to give the image a smooth animation*/
}
/* these are the styles when the user scrolls */
header#masthead.resize img{
height: 50px; /* <=== here i gived the image a smaller size */
}
I'm working on a project that animate on page scroll.
This is the element I want to animate.
<h1 style="position: relative; top: 0; left: 0;"
onscroll="animateAfterPosition(200)"
data-animate-left="50px" data-animate-top="50px"
data-animate-time="0.2s">Animation on scroll</h1>
This is my JavaScript
function animateAfterPosition(scroll) {
console.log(scroll);
function(){
if (window.scrollY <= scroll) {
this.classList.add('animateAfterPosition');
} else {
this.classList.remove('animateAfterPosition');
}}
And this is my CSS
.animateAfterPosition {
transition: attr(data-animate-time);
left: attr(data-animate-left);
top: attr(data-animate-top);}
I need to run the function animateAfterPosition from the html. I expected to run the function with onscroll event, but it doesn't work. So how can I do this?
Edit
I found that css attr() is only working with the content: property and I managed to do it with JavaScript
You need to add selector to toggle class the animation. And your current css doesn't have enough height to make scrolling window. Here's an simple snippet to run your function onload, update onscroll and toggling class.
var dataAnimate = document.querySelector('[data-animate]');
function animateAfterPosition(scroll) {
dataAnimate.classList.toggle('active', window.scrollY <= scroll);
}
window.addEventListener("scroll", function() {
return animateAfterPosition(200);
});
.animateAfterPosition {
transition: attr(data-animate-time);
left: attr(data-animate-left);
top: attr(data-animate-top);
}
[data-animate] {
height: 1000px;
}
<body onload="animateAfterPosition(200)">
<h1 style="position: relative; top: 0; left: 0;"data-animate-left="50px" data-animate-top="50px" data-animate-time="0.2s" data-animate>Animation on scroll</h1>
</body>
Fiddle: https://jsfiddle.net/rafonzoo/phmg0u46/
A minimalistic solution
You can configure it using the first 4 variables in the function. I recommend adding the indicator class to the body itself and then use a selector like body.beyond-that-point h1. This way, it's possible to make several tags behave differently as the scrolling happens.
You can test it here
This version uses a fancier effect but the logic behind is the same.
https://deneskellner.com/stackoverflow-examples/62623588/index.html
<!doctype html>
<html>
<style>
body.beyond-that-point {background:silver;}
div.text {padding:75vh 0px;text-align:center;}
</style>
<body>
<div class="text">
Scroll me down and the background will change
</div>
<script>
setTimeout(function() {
var amount = 100; // how many pixels before the miracle happens
var beyondClass = 'beyond-that-point'; // this class will be added
var targetSelector = 'body'; // which element to add the class to
var checkMS = 20; // check scroll position every N milliseconds
var eClass = document.querySelector(targetSelector).classList;
setInterval(function() {
var y = window.scrollY;
var c = beyondClass;
var isBeyond = !!(y>=amount)?1:0;
if(isBeyond==1) if(!eClass.contains(c)) eClass.add(c);
if(isBeyond==0) if( eClass.contains(c)) eClass.remove(c);
},checkMS);
},1);
</script>
</body>
</html>
Note: there are better ways to check DOM readiness but for simplicity I used setTimeout here. Feel free to change it.
let's get straight to the point:
My code looks like the following:
<div id="keep_up">
<div id="thread_menu">
<div id="new_thread">
</div>
</div>
</div>
And my css:
#keep_up {
position: fixed;
width: 13%;
}
#thread_menu{
height: 80vh;
width: 100%;
float: left;
position: relative;
}
Now i use this for a forum. and this is basically to show the active and new threads on the side of the screen.
However. When watching a thread, the header disappears (Wich makes sense because we are scrolling down).
but i want the thread menu to stay on my side (So that it is always visible). In this case that is happening because my keep_up div has position: fixed. But i only see half of the thread menu becuase it is too long and won't scroll up.
My question:
I want the thread menu to scroll up, untill it reaches the top of my window. From then on i want it to stay there.
How do i do this?
I saw a few examples but none of them worked for me.
EDIT: Code i tried:
<script src="jquery.min.js">
$(window).scroll(function () {
var margin = null;
$(window).on("scroll", function () {
var scrollHeight = $(document).height(),
scrollTop = $(window).scrollTop(),
offsetBottom = 110, // Offset depending on the height of the footer
offsetTop = 100, // Offset depending on the height of the header
positionTop = $(".keep_up").offset().top,
affix;
if (margin != null && (scrollTop + margin <= positionTop)) {
// The sidebar has reached the bottom and is still on the bottom
affix = false;
} else if (positionTop + $(".keep_up").height() >= scrollHeight - offsetBottom) {
// The sidebar has reached the bottom
affix = 'bottom';
} else if (scrollTop <= offsetTop) {
// The sidebar has reached the top
affix = 'top';
} else {
// The sidebar is midway
affix = false;
}
// If the sidebar hasnot changed his state, return;
if ($(".keep_up").hasClass('at' + (affix ? '-' + affix : ''))) return;
if (affix == 'bottom') {
margin = positionTop - scrollTop;
} else {
margin = null;
}
// If the related class is added to the div
$(".keep_up").removeClass('at at-top at-bottom').addClass('at' + (affix ? '-' + affix : ''))
});
});
</script>
And the CSS:
.keep_up{
/*position: fixed;*/
width: 13%;
}
.keep_up.at {
top: 1px;
position: fixed;
}
.keep_up.at-top{
}
.keep_up.at-bottom {
top: 438px;
position: absolute;
}
modify this on HTML:
<div id="prevent"></div>
<div id="keep_up" data-spy="affix" data-offset-top="200">
Add this CSS:
.affix{position: fixed !important; top:0px; z-index:999;}
.affixpatch{margin-top:100px !important;}
this will fix the div when you scroll down 200px. Change data-offset-top value to reach it on different break point.
.affixpatch is a class that will be loaded with next jquery function. it prevents to hide content behind top fixed div. Change margin-top to another value if this don't solves the "hide content" problem that always generate affixing divs.
<script>
$(function() {
//caches a jQuery object containing the header element
var header = $(".affix");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 200) {
$('#prevent').addClass("affixpatch");
} else {
$('#prevent').removeClass("affixpatch");
}
});
});
</script>
Hope it helps. If not, you may have some class that rewrite or impede the correct function of this affix.
I've tested this hundreds of times, usually to fix navbars.
SCROLL:
Using overflow to scroll content:
#keep_up{
max-height:400px;
width: auto;
overflow:auto;}
This will scroll the content inside #keep_up div (or use it in another one)
NOTE: you must declare a fixed max height for this div. Set max-width only if you need.
You can use %, em, rem... no need to be px for fix the max witdth. (to get a responsive effect, use responsive measurements)
If I understand your scenario correctly, the way to do this might be to use jQuery (or native JS, but you've tagged jQuery so I'm assuming that's in play).
There's a plugin that handles this kind of thing: http://leafo.net/sticky-kit/
I'd suggest you look at the plugin source code to see how it works - an event handler function on $(window).scroll() which then toggles classes on your #thread_menu to fix it in place. To keep your code lightweight, you probably don't need everything the plugin provides.
Hello, I want a certain text to appear when I scroll past it or when I scroll until the point where the text is. The effect when appearing should be somewhat like the first effect on the top of the website http://namanyayg.com/.
I want the effect in minimal code with pure CSS and JS i.e no jQuery.
I was thinking that maybe I would use something like a display:none property for a span and then when you scroll past it the display becomes block but I dont know how to trigger the effect using javascript.
Any help would be appreciated.
First wrap whatever your text or content that you want to show on scroll, in one div so that you can show hide the div depending upon the scroll. Write two classes for your target div.
Your CSS:
/*Use this class when you want your content to be hidden*/
.BeforeScroll
{
height: 100px; /*Whatever you want*/
width: 100%; /*Whatever you want*/
.
.
display: none;
}
/*Use this class when you want your content to be shown after some scroll*/
.AfterScroll
{
height: 100px; /*Whatever you want*/
width: 100%; /*Whatever you want*/
.
.
display: block;
}
Your HTML:
<!--Set class BeforeScoll to your target div-->
<div id = "divToShowHide" class = "BeforeScroll">Content you want to show hide on scroll</div>
Your Script:
<!--include these script in head section or wherever you want-->
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.1/jquery-ui.min.js" type="text/javascript"></script>
<script type = "text/javascript">
$(document).ready(function(){
//Take your div into one js variable
var div = $("#divToShowHide");
//Take the current position (vertical position from top) of your div in the variable
var pos = div.position();
//Now when scroll event trigger do following
$(window).scroll(function () {
var windowpos = $(window).scrollTop();
//Now if you scroll more than 100 pixels vertically change the class to AfterScroll
// I am taking 100px scroll, you can take whatever you need
if (windowpos >= (pos.top - 100)) {
div.addClass("AfterScroll");
}
//If scroll is less than 100px, remove the class AfterScroll so that your content will be hidden again
else {
s.removeClass("AfterScroll");
}
//Note: If you want the content should be shown always once you scroll and do not want to hide it again when go to top agian, no need to write the else part
});
});
</script>
Hope it will solve your problem.
I would recommend this plugin
http://johnpolacek.github.io/superscrollorama/
Edit:
I don't know how no one noticed that the solution had to be made without using external libraries like jQuery. However, the solution is extremely easy with basic functionality. Find it here
HTML:
<div id="parent-div">
<div id="child-div">
Psst .. I am here!!
</div>
</div>
CSS:
#parent-div
{
position:relative;
height:3000px;
width:300px;
background-color:red;
}
#child-div
{
color:white;
position:relative;
top:1000px;
width:300px;
display:none;
text-align:center;
}
JS:
var body=document.getElementsByTagName("body")[0];
var parent=document.getElementById("parent-div");
var child=document.getElementById("child-div");
body.onscroll = function(){
//console.log(documenhttps://fiddle.jshell.net/3urv0tp0/#tidyt.getElementById("child-div").style.top)
if(document.documentElement.scrollTop>=child.offsetTop)//Adjust Tolerance as you want
{
child.style.display="block"
}
};
I was looking for this either. Here i was trying to make "show text after scrolling to (number)px with fade effect". I wish it will work as it works for me :) The animation will be playing again if u scroll back to it, idk how to make it just one like in web u showed xd (i will edit if I find out)
window.addEventListener("scroll", function() {showFunction()});
function showFunction() {
if (document.body.scrollTop > 900 || document.documentElement.scrollTop > 900) {
document.getElementById("toptexts2").style.display = "block";
} else {
document.getElementById("toptexts2").style.display = "none";
}
}
.toptexts2 {
animation: fadeEffect 3s; /* fading effect takes 3s */
}
#keyframes fadeEffect { /* from 0 to full opacity */
from {opacity: 0;}
to {opacity: 1;}
}
<div class="toptexts2" id="toptexts2">
<div>Hi!</div>
<div>↓ go down ↓</div>
</div>
I like this:
var doc = document, dE = doc.documentElement, bod = doc.body;
function E(e){
return doc.getElementById(e);
}
function xy(e, d){
if(!d)d = 'Top';
d = 'offset'+d;
var r = e[d];
while(e.offsetParent){
e = e.offsetParent; r += e[d];
}
return r;
}
function x(e){
return xy(e, 'Left');
}
function y(e){
return xy(e);
}
var txt = E('theId'), txtS = txt.style;
onscroll = function(){
var left = dE.scrollLeft || bod.scrollLeft || 0;
var top = dE.scrollTop || bod.scrollTop || 0;
var w = innerWidth || dE.clientWidth || bod.clientWidth;
var h = innerHeight || dE.clientHeight || bod.clientHeight;
if(top > y(txt)-h){
txtS.display = 'none';
}
else{
txtS.display = 'block';
}
}
I left the left stuff in there, just in case, but you can probably remove it.
var div=$("#divtochange");
$(window).scroll(function () {
var windowpos = $(window).scrollTop();
//---check the console to acurately see what the positions you need---
console.log(windowpos);
//---------------------
//Enter the band you want the div to be displayed
if ((windowpos >= 0) && (windowpos <= 114)){
div.addClass("AfterScroll");
}
else{
div.removeClass("AfterScroll");
}
I am trying to add a scroll event which will change the background of a div which also acts as the window background (it has 100% width and height). This is as far as I get. I am not so good at jquery. I have seen tutorials with click event listeners. but applying the same concept , like, returning scroll event as false, gets me nowhere. also I saw a tutorial on SO where the person suggest use of array. but I get pretty confused using arrays (mostly due to syntax).
I know about plugins like waypoints.js and skrollr.js which can be used but I need to change around 50-60 (for the illusion of a video being played when scrolled) ... but it wont be feasible.
here is the code im using:-
*
{
border: 2px solid black;
}
#frame
{
background: url('1.jpg') no-repeat;
height: 1000px;
width: 100%;
}
</style>
<script>
$(function(){
for ( i=0; i = $.scrolltop; i++)
{
$("#frame").attr('src', ''+i+'.jpg');
}
});
</script>
<body>
<div id="frame"></div>
</body>
Inside your for loop, you are setting the src attribute of #frame but it is a div not an img.
So, instead of this:
$("#frame").attr('src', ''+i+'.jpg');
Try this:
$("#frame").css('background-image', 'url(' + i + '.jpg)');
To bind a scroll event to a target element with jQuery:
$('#target').scroll(function() {
//do stuff here
});
To bind a scroll event to the window with jQuery:
$(window).scroll(function () {
//do stuff here
});
Here is the documentation for jQuery .scroll().
UPDATE:
If I understand right, here is a working demo on jsFiddle of what you want to achieve.
CSS:
html, body {
min-height: 1200px; /* for testing the scroll bar */
}
div#frame {
display: block;
position: fixed; /* Set this to fixed to lock that element on the position */
width: 300px;
height: 300px;
z-index: -1; /* Keep the bg frame at the bottom of other elements. */
}
Javascript:
$(document).ready(function() {
switchImage();
});
$(window).scroll(function () {
switchImage();
});
//using images from dummyimages.com for demonstration (300px by 300px)
var images = ["http://dummyimage.com/300x300/000000/fff",
"http://dummyimage.com/300x300/ffcc00/000",
"http://dummyimage.com/300x300/ff0000/000",
"http://dummyimage.com/300x300/ff00cc/000",
"http://dummyimage.com/300x300/ccff00/000"
];
//Gets a valid index from the image array using the scroll-y value as a factor.
function switchImage()
{
var sTop = $(window).scrollTop();
var index = sTop > 0 ? $(document).height() / sTop : 0;
index = Math.round(index) % images.length;
//console.log(index);
$("#frame").css('background-image', 'url(' + images[index] + ')');
}
HTML:
<div id="frame"></div>
Further Suggestions:
I suggest you change the background-image of the body, instead of the div. But, if you have to use a div for this; then you better add a resize event-istener to the window and set/update the height of that div with every resize. The reason is; height:100% does not work as expected in any browser.
I've done this before myself and if I were you I wouldn't use the image as a background, instead use a normal "img" tag prepend it to the top of your page use some css to ensure it stays in the back under all of the other elements. This way you could manipulate the size of the image to fit screen width better. I ran into a lot of issues trying to get the background to size correctly.
Html markup:
<body>
<img src="1.jpg" id="img" />
</body>
Script code:
$(function(){
var topPage = 0, count = 0;
$(window).scroll( function() {
topPage = $(document).scrollTop();
if(topPage > 200) {
// function goes here
$('img').attr('src', ++count +'.jpg');
}
});
});
I'm not totally sure if this is what you're trying to do but basically, when the window is scrolled, you assign the value of the distance to the top of the page, then you can run an if statement to see if you are a certain point. After that just simply change run the function you would like to run.
If you want to supply a range you want the image to change from do something like this, so what will happen is this will allow you to run a function only between the specificied range between 200 and 400 which is the distance from the top of the page.
$(function(){
var topPage = 0, count = 0;
$(window).scroll( function() {
topPage = $(document).scrollTop();
if(topPage > 200 && topPage < 400) {
// function goes here
$('#img').attr('src', ++count +'.jpg');
}
});
});