I have been trying to put an element to fixed position within a given scroll height with Javascript. Outside of this height range, the position should be back to relative.
Here is what I have done so far. The position:fixed is inside the about-option class. When it gets to 4680, the class is added.
How do I make it have a height end-point of 5800 i.e 4680 - 5800, and also remove the class outside this height range?
window.onscroll = function () {
myFunction();
};
function myFunction() {
if (
document.documentElement.scrollTop > 4680 ||
document.body.scrollTop > 4680
) {
document.getElementById("about-txt").classList.add("about-option");
} else {
document.getElementById("about-text").className = "";
}
}
css
.about-option {
position: fixed;
top: 20%;
width: 40%;
right: 7%;
I guess you are trying to do what position sticky does: once the element hits the window's top boundery it starts sticking and if you scroll to the inverse way, it goes back to move together with content. Like here:
https://codepen.io/elad2412/pen/QYLEdK
<main class="main-container">
<header class="main-header">HEADER</header>
<div class="main-content">MAIN CONTENT</div>
<footer class="main-footer">FOOTER</footer>
</main>
body{color:#fff; font-family:arial; font-weight:bold; font-size:40px; }
.main-container{ max-width:600px; margin:0 auto; border:solid 10px green; padding:10px; margin-top:40px;}
.main-container *{padding:10px;background:#aaa; border:dashed 5px #000;}
.main-container * + *{margin-top:20px;}
.main-header{
height:50px; background:#aaa; border-color:red;
}
.main-content{
min-height:1000px;
}
.main-header{position:-webkit-sticky; position:sticky; top:0;}
The trick part is to remember to add a container outside the sticky element, otherwise, it will not work.
I hope it helps!
Related
I have a page which i need to dim a certain area (div) instead of the entire page. How can I achieve this?
I have googled some answer but all of them is about dimming the whole page. Below is the sample code that I got but it dimmed the entire page.
<div id="dimmer"></div>
#dimmer
{
background:#000;
opacity:0.5;
position:fixed; /* important to use fixed, not absolute */
top:0;
left:0;
width:100%;
height:100%;
display:none;
z-index:9999; /* may not be necessary */
}
It covered the whole page because you set the width and height to 100%. If you were to make it 100px or 50%, that would work, but if you set it to 100%, it will cover 100% of the page.
.area-to-dim {
position: relative;
}
.dimmer {
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
background-color: rgba(0,0,0,0.5);
}
HTML
<div class="area-to-dim">
<div class="dimmer"></div>
</div>
Two ways, one really simple but I'm not 100% sure this is what you wanted.
First way, use CSS
.genericClassGivenToDivs, #idOfDiv {
background:#fff;
}
/* on mouse over, change the background colour */
.genericClassGivenToDivs:hover, #idOfDiv:hover {
background:#aaa;
}
The second way is more complex. Basically, reposition a div using javascript on mouse over. This requires some CSS and javascript. The following could be a lot cleaner with some work.
<html>
<head>
<style>
body {
margin:1em;
background:#ddd;
}
#contain {
margin:auto;
width:100%;
max-width:720px;
text-align:center;
}
#row1, #row2, #row3 {
width:100%;
height:48px;
line-height:48px;
color:#000;
background:#fff;
}
#row2 {
background:#eee;
}
#dim {
position:absolute;
top:0px;
left:0px;
width:100%;
height:100%;
background:rgba(0,0,0,0.5);
display:none;
}
</style>
</head>
<body>
<div id="contain">
<div id="row1">Row 1</div>
<div id="row2">Row 2</div>
<div id="row3">Row 3</div>
</div>
<div id="dim"></div>
<script>
var dimEl = document.getElementById('dim');
function over() {
//console.log('over:['+ this.id +']');
dimEl.style.top = this.offsetTop +'px';
dimEl.style.left = this.offsetLeft +'px';
dimEl.style.height = this.offsetHeight +'px';
dimEl.style.width = this.offsetWidth +'px';
dimEl.style.display = 'block';
}
window.onload = function() {
var list = ['row1', 'row2', 'row3'];
var e;
for(x in list) {
e = document.getElementById(list[x]);
if (e) {
e.onmouseover = over;
}
}
}
</script>
</body>
</html>
Not entirely sure what "dimming a certain area" means, but I recently created a solution that might be applicable in some extent.
I had a div with a background image and some overlaid text, and the background (but not the text) should darken slightly on mouse over.
I solved it by having two containers and a textfield, so that the outermost div had the background image, the inner div expanded to 100% height and width and had a transparent black solid-color background, and then there was some text in that div.
Then, simply, on hover, I change the inner div background-color from rgba(0, 0, 0, 0) to rgba(0, 0, 0, .3), dimming the background image.
If this sounds applicable, see this jsFiddle
Why the display is none?
Check this?
#dimmer {
background: #111;
top: 0;
left: 0;
width: 100px;
height: 100px;
z-index: 9999;
/* may not be necessary */
}
#dimmer:hover {
background: #000;
opacity: 0.5;
transition: opacity 1s ease;
cursor: pointer;
}
<div id="dimmer">ok</div>
I would like to display indicators for a certain div to show that it can be scrolled right or left depending on its state. To do so I would need to know if element can be scrolled to respective positions, e.g. if there is content to be seen on the right show indicator and after scrolling show another indicator on the left to indicate that users can now scroll there as well. I have a simple setup like this one: https://jsfiddle.net/udv8u596/
(You can scroll horizontally, scrollbar is hidden intentionally)
HTML:
<div class="scroll-container">
<div class="scroll-content">
Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally
</div>
</div>
CSS:
.scroll-container {
width: 80%;
margin: 0 auto;
background: cyan;
overflow-y: hidden;
height: 36px;
}
.scroll-content {
padding: 10px 0;
height: 50px;
white-space: nowrap;
overflow-x: scroll;
overflow-y: hidden;
}
To check if an element is overflowing along the x-axis, you can simply compare its computed width, accessible via jQuery's .width() method, and its scrollWidth, a native JS function:
var $ele = $('.scroll-content'),
overflowing = $ele[0].scrollWidth > $ele.width();
You can then check the boolean value of overflowing if the element is overflowing or not. However, note that if you want this variable to be updated if the window resizes, a little more work has to be done:
var $ele = $('.scroll-content'),
overflowing = function() {
if($ele[0].scrollWidth > $ele.width()) {
return true;
} else {
return false;
}
};
console.log(overflowing());
$(window).resize(function() {
console.log(overflowing());
});
Here's a fiddle with the above logic implemented, with some slight modifications: https://jsfiddle.net/teddyrised/udv8u596/5/
Ilya basically you need to check your element right postion. On way of achieving this is to set the inner element to have absolute oistion and get right postion with jQuery
parseInt($('.scroll-content').css('right')) >= 0
I have modified you code as: https://jsfiddle.net/udv8u596/4/
In this example before animating the element it checks if the righ position is bigger than 0.
Please not that righ position is calculated based on the parent element. Left position is set to be 0 in the css but righ postion will be calculated in this example is ~-250.
I hope this gives you an idea how to solve your problem.
Here's a quick start for what you are looking for :
HTML
<div class="scroll-container">
<div class="mask">
<div class="scroll-content">
Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally
</div>
</div>
</div>
<div class="scrollRight">Scroll Right »</div>
<div class="scrollLeft">» Scroll Left </div>
CSS
.scroll-container {
width: 80%;
margin: 0 auto;
background: cyan;
overflow-y: hidden;
overflow-x: hidden;
height: 36px;
}
.mask{
position:relative;
overflow-x: hidden;
overflow-y: hidden;
height: 36px;
width: 100%;
}
.scroll-content {
position:absolute;
padding: 10px 0;
height: 50px;
white-space: nowrap;
overflow-x: visible;
width:auto;
}
.scrollRight, .scrollLeft{
font-size:10px;
display:none;
}
JS
var contentWidth = $(".scroll-content").width();
var containerWidth = $(".scroll-container").width();
if(contentWidth>containerWidth){
$(".scrollRight").show();
}
$("body").on("click", ".scrollRight", function(){
var scrollValue = contentWidth-containerWidth;
$(".scroll-content").animate({"margin-left":"-"+scrollValue+"px"});
$(".scrollRight").hide();
$(".scrollLeft").show();
})
$("body").on("click", ".scrollLeft", function(){
var scrollValue = contentWidth-containerWidth;
$(".scroll-content").animate({"margin-left":"0px"});
$(".scrollRight").show();
$(".scrollLeft").hide();
})
See Update JSFiddle
I'm having a problem with the property position:fixed.
If you check out my
jfiddle you see, that when you scroll, and the black div hits the top, then via JS it adds the style "stick" which makes it fixed in position - as intended. Unfortunately, when I do this, and the div is getting the fixed style, the div below the black bar jumps up a bit, which ruins the idea.
The main CSS I think you have to look at is:
.orangeContent {
max-width:960px;
width:100%;
margin:0px auto;
padding:40px 0px 0px 0px;}
header {
max-width:1920px;
width:100%;
margin:0px auto;
padding:0px;
background:#ffffff;
.stick {
position:fixed;
top:0px;
box-shadow:0px 4px 2px -2px #b32f01 ;
transition-duration:0.2s;}
And of course the Javascript:
$(document).ready(function() {
var s = $("header");
var pos = s.position();
$(window).scroll(function() {
var windowpos = $(window).scrollTop();
if (windowpos >= pos.top) {
s.addClass("stick");
} else {
s.removeClass("stick");
}
});
});
So, basically, any idea on how to fix this ?
Thanks in advance.
This is due to the fact that the black header jumps out of the box flow, so the div below jumps up. I suggest you add the class fix to the pageWrapper instead of the header itself and then, in your css:
.pageWrapper header{
position: static
}
.pageWrapper div { /* the one with all the lorem ipsum */
padding-top: 0;
}
.pageWrapper.stick header{
position: fixed
}
.pageWrapper.stick div { /* the one with all the lorem ipsum */
padding-top: 20px; /* needs to be set as the same height of the header */
}
I edited your fiddle to show you what I mean.
http://jsfiddle.net/AyLNL/3/
I used the .stick + .text selector which basically means the .text after the .stick, but I suggest you place the .text inside the pageWrapper and then go with .stick .text
Of course div will jump as position:fixed takes element from the flow. If your header has static height than adjust padding(or margin) of header.stick + div in your css file otherwise recalculate it on adding/removing 'stick' class
I want to get the position of an element relative to its parent element. So for this i am using jquery position function I created a JsFiddle.
In this fiddle i am accessing the top & left position of #child element. It should return top : 0 and left : 0 because it is the children of #p element and its position is relative but it is returning top : 223px and left : 1px. Can anyone please help me ?
here is the tweak
The problem was you did not specify the parent's position as relative. So the child position was calculated with respect to body
<style type="text/css">
#gp {
width: 500px;
height: 200px;
margin: 0;
border: 1px solid black;
background-color:gray;
overflow:hidden;
}
#p {
width: 600px;
height: auto;
float: left;
position: relative;
}
#child{
position: relative;
}
</style>
<div id="gp">
<div id="p">
<div id="child">
</div>
</div>
</div>
jQuery(document).ready(function(){
alert($("#child").position().top + " " + $("#child").position().left);
});
Perhaps something like this :
function relative_pos(node) {
var parentOf = $(node).parent().offset();
var child = $(node).offset();
return {top: child.top - parentOf.top, left: child.left - parentOf.left};
}
console.log(relative_pos("#child"));
Try !!!
say i have
<div id ="outer" class="outer">
<div id= "inner" class="inner">
//some stuff
</div>
</div>
the inner div has a dynamic height, it changes depending on what is inside the div. the outer div is just a container which is set to have the height of the window.
I want to set it so that the inner div is vertically centered within the outer div. Is there a way to do this easily in CSS or is JavaScript necessary?
THE SOLUTION I FOUND:
var container= document.getElementById("outer");
var inner= document.getElementById("inner");
var inHeight=inner.offsetHeight;
container.style.height=(window.innerHeight-10);
container.style.width=window.innerWidth;
var conHeight=container.offsetHeight;
inner.style.marginTop=((conHeight-inHeight)/2);
In case anyone else searching for a solution to the same problem, this worked for me.
emphasized text
try this out http://jsfiddle.net/gLChk/12/
but it won't be supported in IE<8 browsers. To make it work on all the browsers, you'll have to write a js which will find the height of .inner and apply these css properties
$(document).ready(function(){
var inner = $('.inner'),
ht = inner.height();
inner.css({'position':'absolute','top':'50%','margin':-ht/2+'px 0 0 0'});
});
Hope this helps. :)
.outer {
display: table;
position: relative;
width:100%;
height:200px;
border:1px red solid;
}
.inner {
display: table-cell;
position: relative;
vertical-align: middle;
}
Try it with
.inner {
top: 50%;
bottom: 50%;
}
jsfiddle
greets
use:
.inner
{
margin-top:auto;
margin-bottom:auto;
}