css transition with javascript has no transition - javascript

when I try to make a simple transition with pure CSS all works fine.
But when I try to call a javascript-function which modiefies the CSS when clicked on a link, there is no transition. I want to fade in a grey layer.
HTML:
<a href="someImage.jpg" id="test">
<img src="someImage.jpg" alt="" />
</a>
<section id="grey">
</section>
JS:
var grey = document.getElementById("grey");
var link = document.getElementById("test");
link.onclick = function () {
grey.style.display = "block";
grey.style.opacity = "1";
return false;
};
CSS:
section {
display:none;
size and position...
opacity: 0;
background-color: rgba(0,0,0,0.5);
transition: opacity 1s .5s;
}
(see http://jsfiddle.net/7zEhx/5/ )
I'm using FF22, does anyone know any solutions?

display: none elements don’t transition, and the display: block hasn’t kicked in before you set the other style. There are horrible hacks like this:
setTimeout(function() {
grey.style.opacity = "1";
}, 0);
But I’d just set width to 0 instead of setting display and then put it back at 100%.
Updated jsFiddle

Related

Animate text using intervals (and timeouts?) Javascript, JQuery

I would like to make a Text run from left to right in a loop. Here is the fiddle with my attempt:
https://jsfiddle.net/9Lruxym8/33/
I started with css #keyframes but I think I need the width of the text itself if I want the text to run seamlessly. My idea was to write down the text two times and once the div with the texts has run exactly halfway, the animation starts again.
After #keyframes didn't work, I tried jQuery animation. It did work somewhat but didn't run smoothly. Now I'd like to do it via transition. I thought a combination of intervals and timeouts could do the trick but I still don't get it to work - and now, I don't know why. Does anyone have a hit for me?
function runText() {
var text_width = $('#runningP').width()/2;
console.log(text_width)
setInterval(function(){
console.log("interval");
$('.text').css({'transition':'margin-left 5s'});
$('.text').css({'margin-left':'-' + text_width + 'px'});
moveBack();
}, 3000);
function moveBack() {
console.log("timeout")
setTimeout(function(){
$('.text').css({'transition':'none'});
$('.text').css({'margin-left': 0});
}, 3000);
}
}
runText();
I've recently made a bit of custom code for this functionality.
Looking at my code, it seems a bit much having essentially 3 "levels" (.scrollTextWrap > .scrollingText > .scrollContent) but this was the structure I ended up using to get a clean and consistent effect.
I've added in an initialiser too so that you could simply add the scrollMe class and have them setup the html for you
In the snippet I've added a .parentContainer purely to show how it works when constrained
$(document)
.ready(function(){
// check that scrollingText has 2 scrollContent element
$('.scrollMe')
.each(function(){
initScrollingText($(this));
});
});
function initScrollingText($this){
// store text
var text = $this.text();
// empty element
$this.html(null);
var $wrap = $('<div class="scrollTextWrap" />'),
$text = $('<div class="scrollingText" />'),
$content = $('<div class="scrollContent" />');
// set content value
$content.text(text);
// duplicate content
$text
.append($content)
.append($content.clone());
// append text to wrap
$wrap.append($text)
// add $wrap to DOM
$wrap.insertAfter($this);
// remove old element
$this.remove();
}
/* to simulate width constraints */
.parentContainer {
width: 140px;
position:relative;
overflow:hidden;
}
.scrollTextWrap {
position:relative;
width:auto;
display:inline-block;
}
.scrollingText {
display: flex;
position:relative;
transition:left 0.1s;
animation: scrollText 5s infinite linear;
}
.scrollContent {
white-space: nowrap;
padding-right:5px;
}
#keyframes scrollText {
0% { left:0 }
100% { left:-50% }
}
<div class="parentContainer">
<div class="scrollMe">Content you want to scroll goes here</div>
<!-- alternatively you can just structure the html -->
<div class="scrollTextWrap">
<div class="scrollingText">
<div class="scrollContent">Content you want to scroll goes here</div>
<div class="scrollContent">Content you want to scroll goes here</div>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

workaround for display block and css transitions work properly

CSS transitions will not apply if you set the display property of an element to block immediately before changing the property with the transition attached. You can see the issue in the following example:
var dom = {};
dom.creative = document.getElementById('creative');
dom.creative.style.display = 'block';
dom.creative.style.opacity = 1;
#creative {
display: none;
opacity: 0;
transition: opacity 2s;
}
<div id="creative">
<span>Sample text</span>
</div>
The issue can be fixed by forcing a repaint on the element:
var dom = {};
dom.creative = document.getElementById('creative');
dom.creative.style.display = 'block';
var a = dom.creative.offsetHeight; /* <-- forces repaint */
dom.creative.style.opacity = 1;
#creative {
display: none;
opacity: 0;
transition: opacity 2s;
}
<div id="creative">
<span>Sample text</span>
</div>
This solution is not good because it adds the need of a non intuitive extra line of code everytime you need the display transition combination.
A SO user found an elegant solution (https://stackoverflow.com/a/38210213/6004250) to this problem replacing the transition by the animation property. I'm still curious about making it work together with CSS transitions (because they are easier to understand and to use). Any ideas?

Smooth background images transition - Javascript

http://www.chooseyourtelescope.com/ (>> Please watch it on a minimum 15'' screen, the site is not entirely responsive yet and you wont see what I'm talking about)
When you hover the buttons (moon, planet, etc...) it changes the background. But the transition is buggy on Chrome (image0>blank>image1). And worknig on IE11 but sometimes with a lag. I didn t try with the other browsers.
How to make a smooth transition?
A quick fade Image0>image1, not image0>transition color>image1
Here is the code for the MOON button. Thats the same with the others.
(I don't know anything about Javascript. I found the script below on Stackoverflow.)
HTML
<div class="top-logos-home" id="top-logos-moon-front"><img src="moon-logo.png" alt="MOON"></div>
CSS
.image-home {
position: absolute;
width: 100%;
height: 100%;
background-image: url(Frontpage.jpg);
background-size: cover;
display:inline;
top:0;
}
JAVASCRIPT
jQuery(function(){
var $body = $('.image-home');
$('#top-logos-moon-front').hover(function(){
$body.css('background-image', 'url("Frontpage-moon.jpg")')
}, function() {
$body.css('background-image', '')
})
})
You need to change just your script code if you want smooth transtion.
jQuery(function(){
var $body = $('.image-home');
$('#top-logos-moon-front').hover(function(){
$body.fadeOut('slow',function(){
$body.css('background-image', 'url("Frontpage-moon.jpg")').fadeIn('slow');
});
}, function() {
$body.css('background-image', '')
})
})
If you want to do best solution for this you need follow the steps below.
Firstly you need to defined your path of images in the js with the below code.
var imgs = [
'http://i.imgur.com/DwLjYhh.jpg',
'http://i.imgur.com/gAlqfUU.jpg'
];
After this step, you need to add new attiribute your buttons like data-id.
<div class="top-logos-home" id="top-logos-moon-front" data-id='0'>
<img src="button_image_jpg" alt="MOON">
</div>
When you defined all variables, you need to detect the hover with your current code and choose the right image that is in imgs array for your background.
jQuery(function(){
var $body = $('.image-home');
$('#top-logos-moon-front').hover(function(){
$body.fadeOut('slow',function(){
//fade out slowly element and after change the style of inner elements then fade in slowly.
$body.css('background-image','url('+imgs[$(this).attr('data-id')]+')').fadeIn('slow');
});
});
});
In my personal opinion; Image transitions shouldn't manage in this way. Create different element for each planets. When user click the button, planets slip and overlapping. You can see a demo in the below code.
http://codepen.io/thegeek/pen/GDwCa
I found a solution by using the opacity property. Now its working perfectly.
HTML
<img id="background-moon-front" class="hover-backgrounds" src="Frontpage-moon.jpg" />
CSS
.hover-backgrounds {
opacity:0;
transition: opacity 0.6s linear;
top:0;
position:absolute;
background-size: 100%;
}
JAVASCRIPT
$(document).ready(function (e) {
$("#top-logos-lune-front").hover(function (e) {
$("#background-moon-front").css("opacity", "1");
}, function() {
$("#background-moon-front").css("opacity", "0")
})
});

JavaScript - Make an image turn white on click

I've got a bunch of images, on click I want the images to turn white emulating some kind of fade effect. So you click it and for 1 second it fades from the original image to just white. I also need it to turn back to the original image when the user clicks something else.
Is this possible with JavaScript? - If so what should I be looking at (I'm really bad with graphics).
I've had a go at trying this with opacity but I don't want the background to be visible behind the image
Psuedo-element Solution
You could use a wrapper with a pseudo-element to overlay what you're looking for -- and the animations are handled by a toggled CSS class (which is ideal for performance).
CodePen Demonstration
HTML
<div class="whiteclicker">
<img src="http://lorempixel.com/400/200" alt=""/>
</div>
SCSS
#import "compass/css3/transition";
body { background: gainsboro; text-align: center; }
.whiteclicker {
display: inline-block;
position: relative;
&::after {
content: "";
display: block;
position: absolute;
top:0; left:0; right:0; bottom:0;
background: white;
opacity: 0;
#include transition(opacity 1s ease);
}
&.active::after {
opacity: 1;
}
}
JS
$('.whiteclicker').click(function(){
$(this).toggleClass('active');
});
To ameliorate the Spencer Wieczorek solution (the way two seems to be the best solution on my opinion) :
What about creating the white div on the fly (and fade it in and out) instead of put it in the html code ?
See the fiddle.
$("#myImage").click(function(){
$(this)
.parent().css({position:'relative'}).end()
.after($('<div>')
.hide()
.css({position:'absolute'
, top: $(this).position().top
, left: $(this).position().left
, width: $(this).width()
, height: $(this).height()
, background: '#FFF'
})
.fadeIn('fast')
.on({
click : function(e){
$(this).fadeOut('fast', function(){ $(this).remove();});
}
})
);
});
Then, you don't have anything to add to the html code or in the css styles, Jquery does everything.
#Spencer Wieczorek : I did my own answer, because I did not agree with your way of designing the css style (the fixed position is really not good, especially if the page is scrolled for example...). Mine is more ... standalone-y ;)
You might want to try having two images stacked on each other.
See this:
<script type="text/javascript">
var image1 = '<img class="images" src="Image 1" onClick="switch();" />';
var image2 = '<img class="images" src="Image 2" onClick="switch();" />';
var currentImage = 1;
function switch(){
if(currentImage==1){
currentImage++;
document.getElementById("image").innerHTML = image2;
}
if(currentImage==2){
currentImage--;
document.getElementById("image").innerHTML = image1;
}
}
</script>
<style>
.images{ position:fixed; top: 0; left: 0; }
</style>
<img class="images" src="Black image" />
<div id="image"><img class="images" src="Image 1" onClick="switch();" /></div>
For the fade I'm just gonna see how you could do it.
EDIT:
<script type="text/javascript">
var fadecount = 100;
function fade() {
document.getElementById("imageToFade").style.opacity = fadecount;
fadecount--;
if(fadecount==0){
clearTimeout(fade);
}
}
function start_fade(){
var fade = setTimeout(fade(), 10);
}
</script>
With Base 64 you can just have the binary version of the picture and then an all white picture and based on the .click you reassign the src to the white base64...
document.getElementById("img").src = "data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
9TXL0Y4OHwAAAABJRU5ErkJggg=="
just change to the all white version after the click, technically js driven from click event, and doesn't involve two different elements existing just at different layers...

show loading icon until the page is load?

I wanted to show a loading icon to users until the page elements are fully loaded. How can I do that with javascript and I want to do it with javascript, not jquery?
Here is a link how google does it
How can I do this?
triggering some function on onload event or something like this .. I know it will be done somewhat like this or any other ways to do it?
Or there is some event for it?
UPDATE
I did something using display property I hide the body element but and onload of body tag I change its property but where to put the loading icon and add more interactivity.
HTML
<body>
<div id="load"></div>
<div id="contents">
jlkjjlkjlkjlkjlklk
</div>
</body>
JS
document.onreadystatechange = function () {
var state = document.readyState
if (state == 'interactive') {
document.getElementById('contents').style.visibility="hidden";
} else if (state == 'complete') {
setTimeout(function(){
document.getElementById('interactive');
document.getElementById('load').style.visibility="hidden";
document.getElementById('contents').style.visibility="visible";
},1000);
}
}
CSS
#load{
width:100%;
height:100%;
position:fixed;
z-index:9999;
background:url("/loading.gif") no-repeat center center rgba(0,0,0,0.25)
}
Note:
you wont see any loading gif if your page is loaded fast, so use this code on a page with high loading time, and i also recommend to put your js on the bottom of the page.
DEMO
http://jsfiddle.net/6AcAr/ - with timeout(only for demo)
http://jsfiddle.net/47PkH/ - no timeout(use this for actual page)
update
http://jsfiddle.net/d9ngT/
The easiest way to put the loader in the website.
HTML:
<div id="loading"></div>
CSS:
#loading {
position: fixed;
width: 100%;
height: 100vh;
background: #fff url('images/loader.gif') no-repeat center center;
z-index: 9999;
}
JQUERY:
<script>
jQuery(document).ready(function() {
jQuery('#loading').fadeOut(3000);
});
</script>
add class="loading" in the body tag then use below script with follwing css code
body {
-webkit-transition: background-color 1s;
transition: background-color 1s;
}
html, body { min-height: 100%; }
body.loading {
background: #333 url('http://code.jquery.com/mobile/1.3.1/images/ajax-loader.gif') no-repeat 50% 50%;
-webkit-transition: background-color 0;
transition: background-color 0;
opacity: 0;
-webkit-transition: opacity 0;
transition: opacity 0;
}
Use this code
var body = document.getElementsByTagName('body')[0];
var removeLoading = function() {
setTimeout(function() {
body.className = body.className.replace(/loading/, '');
}, 3000);
};
removeLoading();
Demo: https://jsfiddle.net/0qpuaeph/
HTML, CSS, JS are all good as given in above answers. However they won't stop user from clicking the loader and visiting page. And if page time is large, it looks broken and defeats the purpose.
So in CSS consider adding
pointer-events: none;
cursor: default;
Also, instead of using gif files, if you are using fontawesome which everybody uses now a days, consider using in your html
<i class="fa fa-spinner fa-spin">
Element making ajax call can call loading(targetElementId) method as below to put loading/icon in target div and it'll get over written by ajax results when ready. This works great for me.
<div style='display:none;'><div id="loading" class="divLoading"><p>Loading... <img src="loading_image.gif" /></p></div></div>
<script type="text/javascript">
function loading(id) {
jQuery("#" + id).html(jQuery("#loading").html());
jQuery("#" + id).show();
}
HTML page
<div id="overlay">
<img src="<?php echo base_url()?>assest/website/images/loading1.gif" alt="Loading" />
Loading...
</div>
Script
$(window).load(function(){
//PAGE IS FULLY LOADED
//FADE OUT YOUR OVERLAYING DIV
$('#overlay').fadeOut();
});
firstly, in your main page use a loading icon
then, delete your </body> and </HTML> from your main page and replace it by
<?php include('footer.php');?>
in the footer.php file type :
<?php
$iconPath="myIcon.ico" // myIcon is the final icon
echo '<script>changeIcon($iconPath)</script>'; // where changeIcon is a javascript function whiwh change your icon.
echo '</body>';
echo '</HTML>';
?>

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