Develop Reference

Show Navbar on Scroll: Not Shown on Reload

I'm using a bit of jquery to have a Bootstrap 4 navbar fade in when scrolling down past a certain point, by adding and removing a specific class. However, the code I have won't show the navbar if I reload the page having already scrolled down, and when scrolling back up the CSS transition doesn't fade the bar out but simply pops out of view instantly. How can I fix those issues? Would it be better to rely on purely jquery instead of relying on a CSS class? If so, how would that work? Thanks!
JS:
$(window).scroll(function(e) {
if($(window).width() >= 768)
var scroll = $(window).scrollTop();
if (scroll >= 300) {
$('.navbar-home').addClass("navbar-hide");
} else {
$('.navbar-home').removeClass("navbar-hide");
}
});
CSS:
.navbar-home {
opacity: 0;
visibility: hidden;
transition: opacity 0.5s ease-in-out;
-moz-transition: opacity .2s ease-in-out;
-o-transition: opacity .2s ease-in-out;
-webkit-transition: opacity .2s ease-in-out;
}
.navbar-hide {
opacity: 1;
visibility: visible;
}

You also need to call the same code on page load. Change the listener to:
$(window).on("scroll load", function(e) {...})

Javascript/jquery, why does my fadein/fadeout not work?

I have searched and looked through a lot of posts and seen a lot of answers, tried them with no luck.
I got it working with jquery color animation, but then i have to link another library which id like to avoid.
I tried the CSS animation which i couldnt make work, because when i remove the css class it doesnt get the chance to make the fadeout effect..
It is only the fadein/fadeout effect that doesnt happen. The background color switches correctly.
TL;DR: Want my top navigation bar to go from transparent background to white background when visitor has scrolled X amount from top, and then back to transparent when visitor is close to top of page with a smooth transition effect.
$(document).ready(function(){
$(document).scroll(function(){
if ($(this).scrollTop() > 200) {
if ($("#topnav").hasClass('transparent')){
$("#topnav").removeClass('transparent');
$("#topnav").addClass('black').fadeIn(1000);
}
} else if ($(this).scrollTop() < 200) {
if ($('#topnav').hasClass('black')){
$('#topnav').removeClass('black');
$('#topnav').addClass('transparent').fadeIn(1000);
}
}
});
});
why doesnt this work?

You can simply set the background color with CSS, and use CSS transition to achieve the fade in / fade out effect.
.box {
background-color: black;
-webkit-transition: background-color 2s;
transition: background-color 2s;
}
And in Javascript you can set the color:
if ($(this).scrollTop() > 200) {
$("#topnav").css({"background-color", "yellow"});
}
jsfiddle

Try out this simple example
In Your CSS file,
.transparent-background {
background-color: transparent;
-webkit-transition: background-color 1000ms ease;
-ms-transition: background-color 1000ms ease;
transition: background-color 1000ms ease;
}
.black-background {
background-color: black;
-webkit-transition: background-color 1000ms ease;
-ms-transition: background-color 1000ms ease;
transition: background-color 1000ms ease;
}
And in your js file just add class before that attach transparent-background class to topNav container
$(document).ready(function(){
$(document).scroll(function(){
if ($(this).scrollTop() > 200) {
$("#topnav").removeClass("transparent-background").addClass('black-
background')
} else {
$("#topnav").removeClass("black-
background").addClass('transparent-background')
}
});
});

Hiding Dropdown "caret" when sticky header is present

So right now I'm building out our new website, and I've programmed a nice little sticky header using javascript. Here's my Javascript.
http://dev.yoursparksource.com
<script>
jQuery(window).scroll(function() {
if ($(this).scrollTop() > 1){
$('.stickyheader1').addClass("sticky");
}
else{
$('.stickyheader1').removeClass("sticky");
}
});
</script>
And my CSS for the stickyheader and .sticky added class
.stickyheader1 {
position: fixed;
width: 100%;
-webkit-transition: background .3s ease-in-out;
-moz-transition: background .3s ease-in-out;
-ms-transition: background .3s ease-in-out;
-o-transition: background .3s ease-in-out;
transition: background .3s ease-in-out;
height: 85px;
}
.stickyheader1.sticky {
background: rgba(0,0,0,0.80);
-webkit-transition: background .4s ease-in-out;
-moz-transition: background .4s ease-in-out;
-ms-transition: background .4s ease-in-out;
-o-transition: background .4s ease-in-out;
transition: background .4s ease-in-out;
}
And this works PERFECT. My problem is the dropdown menu. I styled a little CSS caret, and when you scroll down and the header background activates, the caret is on top of the header's space, and you can see it behind the semi-transperent header. (EWW! Tacky...)
What I'm wondering, is how can I target this element, as it's an :after pseudo class.. Here's the current CSS for the caret (or top triangle as some call it.)
#nav ul ul:After {
content: '';
position: absolute;
border-style: solid;
border-width: 0 10px 10px;
border-color: rgba(0,0,0,0.40) transparent;
display: block;
width: 0;
z-index: 1;
top: -10px;
left: 20px;
}
I tried just using the same javascript with the "#nav ul ul:After", but after researching, I learned how you can't add styles to a pseudo class. Duh, I knew that, just forgot. That's all. ;-) Any assistance on getting that little caret to go away when I scroll and the stick header's bg activates? Would be a lifesaver for me. (Also, if it can animate with the opacity transition like the header, that would rock. Once I figure out how to target it, I can add the css animation.
Thanks a MILLION in advance! I love StackOverflow.

You will need JavaScript to loop through the stylesheet, find the rule for #nav ul ul:After and set its display property to none after the sticky class is added to .stickyheader1.
jQuery(window).scroll(function() {
if ($(this).scrollTop() > 1) {
$('.stickyheader1').addClass("sticky");
var ss = document.styleSheets;
for (i = 0; i < ss.length; i++) {
var rules = ss[i];
for (j = 0; j < rules.cssRules.length; j++) {
var r = rules.cssRules[j];
if (r.selectorText == "#nav ul ul:After" || r.selectorText == "#nav ul ul::After") {
r.style.display = 'none';
}
}
}
} else {
$('.stickyheader1').removeClass("sticky");
}
});

Make CSS hover element permanent onclick

So I have created a little box with some CSS animation:
.boxtest
{
width: 50px;
height: 50px;
background-color: green;
opacity: .2;
transition: opacity .8s, width .8s ease-out;
-moz-transition: opacity .8s, width .8s ease-out;
-webkit-transition: opacity .8s, width .8s ease-out;
-o-transition: opacity .8s, width.8s ease-out;
}
.boxtest:hover {
opacity: 1;
width: 70%;
}
What I'd like is for the CSS hover class to remain permanent after the user has hovered their mouse over the element.
I guess you'd need to use Javascript, but I'm no expert so can't figure out the right command. Any help would be awesome!
http://jsfiddle.net/r75gC/

Here you go!
Basically I used jQuery to add a class to the div. You can choose one of the two below.
//onClick
$(".boxtest").on("click", function () {
$(".boxtest").addClass('permahover');
});
//onHover
$(".boxtest").on("mouseenter", function () {
$(".boxtest").addClass('permahover');
});
I changed the CSS to:
.boxtest:hover,
.permahover {
opacity: 1;
width: 70%;
}
http://jsfiddle.net/rFRc5/2/

If you haven't a lot of experience with javascript I would recommend using JQuery. Use this to include the JQuery libraries in your website:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
this will allow you to simply do (in your html file):
<script>
$(".boxtest").mouseenter(function() { $(".boxtest").addClass("boxtestHover"); });
</script>
also for the above change .boxtest:hover to boxtesthover (or whatever you want)

jQuery is a bit overkill for this.
Instead of hover, use another class name, then just add this to the element
onmouseover="this.className='newClassName'"

How to prevent transition on carousel container when reseting its position?

I have applied CSS transition to translateX on the parent element of my carousel which I animate from 0 to 100% when clicking the next button, what I want to do however is prevent the animation kicking in when I reset the translate position back to 0 inside my setTimeout. Ideally I would like to set transition to none then quickly remove this when my carousel has reset. Can anyone recommend how I would do this?
CSS
.carousel {
height: 100%;
-webkit-transition: -webkit-transform .1s ease-in-out;
-webkit-transform: translate(0, 0);
}
JS
btnNext.on('click', function (e) {
e.preventDefault();
//move carousel to right 100%
carousel.css('transform', 'translateX(-100%)');
$('.slide:first').insertAfter('.slide:last');
setTimeout(function () {
resetSlides();
resetCarousel();
}, 5000);
});
function resetCarousel() {
$('.carousel').css({
'transform': 'translateX(0%)',
'transition': 'none'
});
//now remove inline transition:none style without a transition occurring?
}
JSFiddle: http://jsfiddle.net/GKv4p/22/

You could use a second css class, "animated". In your CSS you could then have:
.carousel {
height: 100%;
}
.carousel.animated {
-webkit-transition: -webkit-transform .1s ease-in-out;
-webkit-transform: translate(0, 0);
}
In your JavaScript you would then add or remove this extra class in order to add or remove the animation.

Ok, so I think I got it working as you want.
The main changes I made were to add the -webkit-transition: all .1s ease-in-out; to the .expose-* classes, and add a delay into $('.carousel').attr('style', '');
Ended up with this Fiddle