Background color change on scroll - javascript

I wanna change the background color on a scroll, but I think that problem is I'm using Bootstrap. Can you help me? Any solutions? I'm almost sure it doesn't work because of Bootstrap. I can't type in data-color !important or in JavaScript. What can I do to overwrite the Bootstrap class?
const sections = document.querySelectorAll('.bg');
function changeBackground(){
const bottom= window.scrollY + window.innerHeight;
sections.forEach(section => {
sectionMiddle= section.offsetTop + (section.offsetHeight / 2);
if(bottom >sectionMiddle){
document.body.style.backgroundColor = section.dataset.color;
}
});
}
window.addEventListener('scroll', changeBackground);
*{
margin:0;
padding:0;
box-sizing: border-box;
}
body{
background-color: #9bc3f6;
transition: background .8s;
}
.section1, .section2{
height:100vh;
width:100%;
}
<!DOCTYPE html>
<html>
<head>
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0- alpha3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-CuOF+2SnTUfTwSZjCXf01h7uYhfOBuxIhGKPbfEJ3+FqH/s6cIFN9bGr1HmAg4fQ" crossorigin="anonymous">
</head>
<body>
<div class="container-fluid section1 bg" data-color="yellow">
<h1>Hello World</h1>
</div>
<div class="container-fluid text-center section2 bg" data-color="blue">
<h1>Hello World 2</h1>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"
integrity="sha512-bLT0Qm9VnAYZDflyKcBaQ2gg0hSYNQrJ8RilYldYQ1FxQYoCLtUjuuRuZo+fjqhx/qtq/1itJ0C2ejDxltZVFg==" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-alpha3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-popRpmFF9JQgExhfw5tZT4I9/CI5e2QcuUZPOVXb1m7qUmeR2b50u+YFEYe1wgzy" crossorigin="anonymous"></script>
</body>
</html>

It's not a css best practice to put !important to override css rules, to override bootstrap css rules it's better to add extra tags in your selector :
for example:
``const sections = document.querySelectorAll('body .bg');``
or:
``const sections = document.querySelectorAll('html body .bg');``

Related

Slide a hidden bootstrap card from right to left on button click

I have a bootstrap4 `card' which is hidden and I want to display it with slide right to left slow animation on button click. Below is the markup
<div class="card" id="setup" style="display:none;">
<div class="card-header">Settings</div>
<div class="card-body">
Setup
</div>
</div>
</div>
Below is click event
$("#Finalize").click(function () {
$('#setup).show();
$("#setup").animate({ left: '0' }, 'slow');
});
With the above jquery code, I am just able to display the card, its animation effect is not working? What's wrong and how to make it work?
This worked for me:
$(function(){
$("#Finalize").click(function () {
$(".cardcontainer").show();
var left = $('#card').offset().left;
$("#card").css({left:left}).animate({"left":"0px"}, "slow");
});
});
.cardcontainer{
position:relative;
height: 220px;
display:none
}
.card{
position:absolute !important;
width:200px;
right:0px;
}
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<div class="cardcontainer">
<div class="card" id="card">
<div class="card-header">Settings</div>
<div class="card-body">
Setup
</div>
</div>
</div>
</div>
<div>
<a id="Finalize" href="#" class="btn btn-primary">Go somewhere</a>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>
Ok, here is the html:
<div class="card animatable" id="setup" style="display: none;">
<div class="card-header">Settings</div>
<div class="card-body">
Setup
</div>
</div>
</div>
here is the CSS (we need to define a width for the card. I just put 500px, you can make it however big you want it obviously)
#setup {
width: 500px;
}
And here is the javascript.
$("#Finalize").click(function () {
if ($('#setup').hasClass('animatable')) {
$('#setup').show();
$('#setup').css('margin-left', $(window).width());
$("#setup").animate({ right: "+=" + $(window).width()}, 'slow');
$('#setup').removeClass('animatable');
}
});
Note I know you said you didn't want a margin. According to the HTML code you posted, the card will appear on the left side of the screen with the DOM loads. So if you run the animation, it will fly off the screen because it's going to move to the left when it's already placed at the left. So we need to move it to the right, hence my margin-left. Now if you absolutely cannot have a margin, you can give the card an absolute position, and just left it over to the right side of the screen. Also, we need to give it a width so that the card won't crumple up when we move it to the right side of the screen.
I hope this helps!

Angular Js hide Div one by one with animation

I am looking to fadeout all Div (with css property display set to inline:block) with same class randomly one-by-one until 1 last random div remains. I am certainly able to do it with jquery but I am unable to make it work with fadeOut inline:block property.
So my div are aligned next to each other like
and I would need to hide them randomly one by one.
After a random div is removed
the removed div space should be retained as in css property visibility:hidden and the last div number which is left will be shown in JavaScript alert.
Here is my staring code
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="lib/style.css">
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.19/angular.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.20/angular-animate.min.js"></script>
<script src="lib/script.js"></script>
</head>
<body class="container" ng-app="animateApp" ng-controller="mainController">
<div class="row">
<div class="col-xs-12">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
</div>
</div>
</body>
</html>
Here is the fiddle https://plnkr.co/edit/OG1EmWjQi1bHj5OC69Z7?p=info
Any help is really appreciated.
You can define how items are hidden through the ng-hide CSS class. You can override the display attribute to keep it as inline-block, and use CSS animations to fade it away.
// Add your code here
angular.module("animateApp", [])
.controller("mainController", function($scope, $timeout) {
$scope.data = [1, 2, 3, 4, 5];
var hidden = [];
$scope.shouldHide = function(index) {
return hidden.indexOf(index) >= 0;
};
function hideRandom() {
if ($scope.data.length - 1 < hidden.length) {
return;
}
var randomTime = Math.floor(Math.random()*1000)
var randomElem = Math.floor(Math.random()*$scope.data.length);
while (hidden.indexOf(randomElem) >= 0) {
randomElem = Math.floor(Math.random()*$scope.data.length);
}
$timeout(function() {
hidden.push(randomElem);
hideRandom();
}, randomTime);
}
hideRandom();
});
/* Add your styles here */
.item{
height:30px;
width:30px;
display:inline-block;
border:1px solid #000000;
}
.item.ng-hide {
transition:0.5s linear opacity;
opacity:0;
display:inline-block !important;
}
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.19/angular.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.20/angular-animate.min.js"></script>
</head>
<body class="container" ng-app="animateApp" ng-controller="mainController">
<div class="row">
<div class="col-xs-12">
<div class="item" ng-repeat="i in data track by $index" ng-show="!shouldHide(i)">{{i}}</div>
</div>
</div>
</body>
</html>

after giving the transition-duration property i cant able to use the jQuery functions properly

jQuery functions like .hide(),.fadeIn(),.fadeOut() are not properly working after giving the transition duration property.
example : hide(2000) then after 2 second it is hiding but the animation is not getting applied and it is the common problem i am having with all the jQuery functions
if i delete the transition-duration then all working with animation. Why this is happening? Someone explain it to me and also give solution to solve this problem
HTML
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title> Opening Sequence </title>
<link rel="stylesheet" href="open.css">
<script src="jquery.js"></script>
<script src="open.js"></script>
</head>
<body>
<br><br>
<section id="container">
<p id="content"> This is cool </p>
</section>
</body>
</html>
CSS
#charset "utf-8";
/* CSS Document */
#container
{
width:600px;
height:600px;
margin:0 auto;
border:1px solid red;
line-height:500px;
}
#content
{
font-weight:bold;
font-family:Verdana, Geneva, sans-serif;
font-size:20px;
text-align:center;
transition-duration:3s;
}
JS
$(document).ready(function()
{
//alert("Application has been started");
$i=0;
var ob=$('#content');
ob.slideUp(4000);
//ob.hide(2000);
});
problem is after 4 seconds it is hiding but not sliding up, in the sense not animating like hiding from the down to the top

Resizable split screen divs using jquery UI

I have a design in mind that involves a split panel view in html, similar to a winforms split panel. I've been expirimenting with jQuery UI - Resizable and I like the function, I just can't seem to co-ordinate the resizing of the two divs. The problem with the current code is that the two divs resize away from each other, not with one following the other. How can I make the two divs work together?
<html>
<head>
<title>Test</title>
<link rel="stylesheet" type="text/css" href="css/custom.css" />
<link rel="stylesheet" type="text/css" href="css/superfish.css" media="screen">
<link rel="stylesheet" type="text/css" href="css/jquery-ui-1.8.10.custom.css" media="screen">
<script type="text/javascript" src="script/jquery-1.5.1.js"></script>
<script type="text/javascript" src="script/superfish.js"></script>
<script type="text/javascript" src="script/jquery-ui-1.8.10.custom.min.js"></script>
<script type="text/javascript">
// initialise plugins
$(function(){
try {
$('ul.sf-menu').superfish();
//set up divs
$('#Content').resizable({ handles: 'e', alsoResize: $('#Attributes')});
}catch(ex){
alert(ex.message);
}
});
</script>
</head>
<body>
<div id="Header">
<div id="Menu">
<ul class="sf-menu" id="nav">
<!-- Snip menu -->
</ul>
</div>
</div>
<div id="Middle">
<div id="Content" class="ui-widget-content">This is where the view is.<br/>
Imagine an image here ...
<br/>
<br/>
<br/>
</div>
<div id="Attributes" class="ui-widget-content">
<ul>
<li>A</li>
<li>B</li>
<li>C</li>
</ul>
</div>
</div>
<div id="FootBreak"/>
<div id="Footer">
Help
</div>
</body>
</html>
I have worked out a reasonable hack, using the resize event.
<script type="text/javascript">
var WIDTH_ATTR = 'initWidth';
// initialise plugins
$(function(){
try {
$('#Content').resizable({ handles: 'e', resize: resizeAttr });
$('#Content').attr(WIDTH_ATTR, $('#Content').width());
$('#InfoPanel').attr(WIDTH_ATTR, $('#InfoPanel').width());
}catch(ex){
alert(ex.message);
}
});
function resizeAttr(event, ui){
var change = ui.size.width - $('#Content').attr(WIDTH_ATTR);
$('#InfoPanel').width($('#InfoPanel').attr(WIDTH_ATTR) - change);
};
</script>
I'm still open to cleaner answers from others...
I am not sure if this meets the requirements, but ExtJS handles split panes with ease and works cross-browser. For example, see this RSS feed client in ExtJS. Be aware the ExtJS has commercial licensing restrictions if your intent is to sell your product.
Here is an example with a horizontal split (one top div, one bottom div), maybe slightly more minimalistic:
HTML:
<html>
<head>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div id="div1">1st</div>
<div id="div2">2nd</div>
</body>
</html>
CSS:
#div1, #div2 {
position: absolute;
left: 0;
right: 0;
outline: solid 1px #ccc; /* just for making the divs visible */
margin: 5px; /* just for making the divs visible */
}
#div1 {
height: 100px;
top: 0;
}
#div2 {
top: 110px;
bottom: 0;
}
JavaScript:
$('#div1').resizable({
handles: 's',
resize: resizeEventHandler
});
function resizeEventHandler(event, ui){
var new_height = ui.size.height;
$('#div2').css('top', new_height + 10);
}
See demo here.

How to apply 100% height to div?

I want to make the last/third div to be filled the whole remaining space. I given the 100% height but there is scroll bar is coming, which i dont want to show. I there any CSS solution for same. if not possible from css then the jQuery/JS solution will be fine.
<html style="height:100%">
<head>
<style type="css">
html , body {
width:100%; height:100%;
padding:0px;
margin:0px;
}
</style>
</head>
<body style="height:100%;padding:0px;margin:0px;">
<div style="height:100%;width:100%">
<div style="height:100px;background-color:#ddd"> </div>
<div style="height:25px;background-color:#eee"> </div>
<div style="display:block;height:100%;background-color:#ccc"> </div>
</div>
</body>
</html>
In jQuery, you can try something like this:
$(function() {
$(window).resize(function() {
$('div:last').height($(window).height() - $('div:last').offset().top);
});
$(window).resize();
});
Whenever the window is resized, the last div's height is modified so that the div extends to the bottom of the page. Window's resize method is called on page load so that the div is resized immediately.
If you substract the top offset of the div from the height of the window, you are left with the maximum height available. If you have margins, borders of padding applied, you might have to adjust the value which is substracted, for example:
$('div:last').height($(window).height() - $('div:last').offset().top - 30);
Assuming you want the div 30px from the bottom of the window.
On modern browsers: set position: relative on the container div, position: absolute on the third div. Then you can position it to the top and bottom of the container the same time: top: 0px, bottom: 0px;
You could also use faux columns by adding a vertically repeating background image to the CSS making the columns appear toy the space - this gives the appear. You could add this image to the div that wraps the three columns or to the body tag.
If these columns a going to have content in them it's probably worth adding some as the columns will behave differently.
You can hide the overflow in the containing DIV:
<html>
<head>
<style>
*{margin:0;padding:0;}
html,body{height:100%;}
</style>
</head>
<body>
<div style="overflow:hidden;height:100%">
<div style="height:100px;background-color:#ddd"></div>
<div style="height:25px;background-color:#eee"></div>
<div style="height:100%;background-color:#ccc"> </div>
</div>
</body>
</html>
Note that content might dissapear when resizing the window using this technique.
You can use pure CSS height:100% (where 100% is the height of the visible area in the window) values in quirks mode by not using DOCTYPE at all or using IE-faulty HTML 4.0 DOCTYPE (without the .dtd url)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body style="margin:0; padding:0; overflow:hidden;">
<div style="height: 100%; background: red"></div>
</body>
</html>
You can ditch the <!DOCTYPE.. entirely, it still would have the same effect. overflow:hidden declaration in body style is to get rid of the empty scrollbar in IE. But remember - this is quirks mode which means that you are on unpredictable territory, CSS box model differs from browser to browser!
html style="height:100%">
<head>
<style type="css">
html , body {
width:100%;
height:100%;
padding:0px;
margin:0px;
}
</style>
</head>
<body style="height:100%;padding:0px;margin:0px;">
<div style="height:100%;">
<div style="height:100px;background-color:#ddd"> </div>
<div style="height:25px;background-color:#eee"> </div>
<div style="position:fixed;top:125px;height:100%;width:100%;background-color:#ccc"> </div>
</div>
</body>
</html>
Perhaps this could work?! But I don't know whats happens if there is to mutch text...
Simply don't worry about it if your goal is to have the colour fill the bottom.
Set the colour of the outer div, and let the third one resize its height however it wants as content goes in.
<html style="height:100%">
<head>
<style type="css">
html , body {
width:100%; height:100%;
padding:0px;
margin:0px;
}
</style>
</head>
<body style="height:100%;padding:0px;margin:0px;">
<div style="height:100%;width:100%;background-color:#ccc">
<div style="height:100px;background-color:#ddd"> </div>
<div style="height:25px;background-color:#eee"> </div>
<div style=""> </div>
</div>
</body>
</html>
The property 'height: 100%;' will instruct browsers to take the 100 per cent of the available screen space for that particular div, which means that your browser will check the browsing space size and return it to the CSS engine without checking whether there are any elements inside it.
The only workaround that I see to fit here is to use the solution provided by David to use 'position: absolute; bottom: 0;' for that div.
it a bit ugly, but it works..
<html style="height:100%">
<head>
<style type="css">
html , body {
width:100%;
height:100%;
padding:0px;
margin:0px;
}
</style>
</head>
<body style="height:100%;padding:0px;margin:0px;">
<div style="width:100%;height:100%;">
<div style="width:100%;height:100px;background-color:#ddd;"> </div>
<div style="width:100%;height:25px;background-color:#eee;"> </div>
<div style="width:100%;height:100%;background-color:#ccc;margin-bottom:-1000em;padding-bottom:1000em;"> </div>
</div>
</body>
</html>
Here's a litle jquery fix I have done:
<html>
<head>
<title>test</title>
<script src="jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
var heightToFill = $("#parentDiv").height() - $("#firstDiv").height() - $("#secondDiv").height();
$("#thirdDiv").height(heightToFill);
});
</script>
</head>
<body style="height: 100%; padding: 0px; margin: 0px;">
<div id="parentDiv" style="height: 100%; width: 100%; position:absolute;">
<div id="firstDiv" style="height: 100px; background-color: #ddd">
</div>
<div id="secondDiv" style="height: 25px; background-color: #eee">
</div>
<div id="thirdDiv" style="background-color: #ccc;">
a</div>
</div>
</body>
</html>
$(window).resize(function(){
$('.elastic').each(function(i,n){
var ph = $(this).parent().height();
var pw = $(this).parent().width();
var sh = 0;
var s = $(this).siblings().each(function(i,n){
sh += $(this).height();
})
$(this).height(ph-sh);
sh = 0, ph = 0, s=0;
});
});
put the following on on your script tag or external javascript.
then change
when you resize the window... it will automatically fit its height to available space on the bottom. you could have as many divs as you like however you can only have one elastic inside that parent. couldnt be bothered to calculate multiple elastics :) hope it helps
$(document).ready(function() {
var heightToFill = $("#parentDiv").height() - $("#firstDiv").height() - $("#secondDiv").height();
$("#thirdDiv").height(heightToFill);
$(window).resize(function(){ var heightToFill = $("#parentDiv").height() - $("#firstDiv").height() - $("#secondDiv").height();
$("#thirdDiv").height(heightToFill);
});
This should be included in case the browser is resized....
window.onload = setHeight
window.onresize = setHeight
function setHeight() {
document.getElementById('app').style.height = window.innerHeight + "px"
}

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