I have a scrolled div and I want to have an event when I click on it, it will force this div to scroll to view an element inside.
I wrote its JavasSript like this:
document.getElementById(chr).scrollIntoView(true);
but this scrolls all the page while scrolling the div itself.
How to fix that?
I want to say it like this:
MyContainerDiv.getElementById(chr).scrollIntoView(true);
You need to get the top offset of the element you'd like to scroll into view, relative to its parent (the scrolling div container):
var myElement = document.getElementById('element_within_div');
var topPos = myElement.offsetTop;
The variable topPos is now set to the distance between the top of the scrolling div and the element you wish to have visible (in pixels).
Now we tell the div to scroll to that position using scrollTop:
document.getElementById('scrolling_div').scrollTop = topPos;
If you're using the prototype JS framework, you'd do the same thing like this:
var posArray = $('element_within_div').positionedOffset();
$('scrolling_div').scrollTop = posArray[1];
Again, this will scroll the div so that the element you wish to see is exactly at the top (or if that's not possible, scrolled as far down as it can so it's visible).
You would have to find the position of the element in the DIV you want to scroll to, and set the scrollTop property.
divElem.scrollTop = 0;
Update:
Sample code to move up or down
function move_up() {
document.getElementById('divElem').scrollTop += 10;
}
function move_down() {
document.getElementById('divElem').scrollTop -= 10;
}
Method 1 - Smooth scrolling to an element inside an element
var box = document.querySelector('.box'),
targetElm = document.querySelector('.boxChild'); // <-- Scroll to here within ".box"
document.querySelector('button').addEventListener('click', function(){
scrollToElm( box, targetElm , 600 );
});
/////////////
function scrollToElm(container, elm, duration){
var pos = getRelativePos(elm);
scrollTo( container, pos.top , 2); // duration in seconds
}
function getRelativePos(elm){
var pPos = elm.parentNode.getBoundingClientRect(), // parent pos
cPos = elm.getBoundingClientRect(), // target pos
pos = {};
pos.top = cPos.top - pPos.top + elm.parentNode.scrollTop,
pos.right = cPos.right - pPos.right,
pos.bottom = cPos.bottom - pPos.bottom,
pos.left = cPos.left - pPos.left;
return pos;
}
function scrollTo(element, to, duration, onDone) {
var start = element.scrollTop,
change = to - start,
startTime = performance.now(),
val, now, elapsed, t;
function animateScroll(){
now = performance.now();
elapsed = (now - startTime)/1000;
t = (elapsed/duration);
element.scrollTop = start + change * easeInOutQuad(t);
if( t < 1 )
window.requestAnimationFrame(animateScroll);
else
onDone && onDone();
};
animateScroll();
}
function easeInOutQuad(t){ return t<.5 ? 2*t*t : -1+(4-2*t)*t };
.box{ width:80%; border:2px dashed; height:180px; overflow:auto; }
.boxChild{
margin:600px 0 300px;
width: 40px;
height:40px;
background:green;
}
<button>Scroll to element</button>
<div class='box'>
<div class='boxChild'></div>
</div>
Method 2 - Using Element.scrollIntoView:
Note that browser support isn't great for this one
var targetElm = document.querySelector('.boxChild'), // reference to scroll target
button = document.querySelector('button'); // button that triggers the scroll
// bind "click" event to a button
button.addEventListener('click', function(){
targetElm.scrollIntoView()
})
.box {
width: 80%;
border: 2px dashed;
height: 180px;
overflow: auto;
scroll-behavior: smooth; /* <-- for smooth scroll */
}
.boxChild {
margin: 600px 0 300px;
width: 40px;
height: 40px;
background: green;
}
<button>Scroll to element</button>
<div class='box'>
<div class='boxChild'></div>
</div>
Method 3 - Using CSS scroll-behavior:
.box {
width: 80%;
border: 2px dashed;
height: 180px;
overflow-y: scroll;
scroll-behavior: smooth; /* <--- */
}
#boxChild {
margin: 600px 0 300px;
width: 40px;
height: 40px;
background: green;
}
<a href='#boxChild'>Scroll to element</a>
<div class='box'>
<div id='boxChild'></div>
</div>
Native JS, Cross Browser, Smooth Scroll (Update 2020)
Setting ScrollTop does give the desired result but the scroll is very abrupt. Using jquery to have smooth scroll was not an option. So here's a native way to get the job done that supports all major browsers. Reference - caniuse
// get the "Div" inside which you wish to scroll (i.e. the container element)
const El = document.getElementById('xyz');
// Lets say you wish to scroll by 100px,
El.scrollTo({top: 100, behavior: 'smooth'});
// If you wish to scroll until the end of the container
El.scrollTo({top: El.scrollHeight, behavior: 'smooth'});
That's it!
And here's a working snippet for the doubtful -
document.getElementById('btn').addEventListener('click', e => {
e.preventDefault();
// smooth scroll
document.getElementById('container').scrollTo({top: 175, behavior: 'smooth'});
});
/* just some styling for you to ignore */
.scrollContainer {
overflow-y: auto;
max-height: 100px;
position: relative;
border: 1px solid red;
width: 120px;
}
body {
padding: 10px;
}
.box {
margin: 5px;
background-color: yellow;
height: 25px;
display: flex;
align-items: center;
justify-content: center;
}
#goose {
background-color: lime;
}
<!-- Dummy html to be ignored -->
<div id="container" class="scrollContainer">
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div id="goose" class="box">goose</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
</div>
<button id="btn">goose</button>
Update: As you can perceive in the comments, it seems that Element.scrollTo() is not supported in IE11. So if you don't care about IE11 (you really shouldn't, Microsoft is retiring IE11 in June 2022), feel free to use this in all your projects. Note that support exists for Edge! So you're not really leaving your Edge/Windows users behind ;)
Reference
To scroll an element into view of a div, only if needed, you can use this scrollIfNeeded function:
function scrollIfNeeded(element, container) {
if (element.offsetTop < container.scrollTop) {
container.scrollTop = element.offsetTop;
} else {
const offsetBottom = element.offsetTop + element.offsetHeight;
const scrollBottom = container.scrollTop + container.offsetHeight;
if (offsetBottom > scrollBottom) {
container.scrollTop = offsetBottom - container.offsetHeight;
}
}
}
document.getElementById('btn').addEventListener('click', ev => {
ev.preventDefault();
scrollIfNeeded(document.getElementById('goose'), document.getElementById('container'));
});
.scrollContainer {
overflow-y: auto;
max-height: 100px;
position: relative;
border: 1px solid red;
width: 120px;
}
body {
padding: 10px;
}
.box {
margin: 5px;
background-color: yellow;
height: 25px;
display: flex;
align-items: center;
justify-content: center;
}
#goose {
background-color: lime;
}
<div id="container" class="scrollContainer">
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div id="goose" class="box">goose</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
</div>
<button id="btn">scroll to goose</button>
Code should be:
var divElem = document.getElementById('scrolling_div');
var chElem = document.getElementById('element_within_div');
var topPos = divElem.offsetTop;
divElem.scrollTop = topPos - chElem.offsetTop;
You want to scroll the difference between child top position and div's top position.
Get access to child elements using:
var divElem = document.getElementById('scrolling_div');
var numChildren = divElem.childNodes.length;
and so on....
If you are using jQuery, you could scroll with an animation using the following:
$(MyContainerDiv).animate({scrollTop: $(MyContainerDiv).scrollTop() + ($('element_within_div').offset().top - $(MyContainerDiv).offset().top)});
The animation is optional: you could also take the scrollTop value calculated above and put it directly in the container's scrollTop property.
We can resolve this problem without using JQuery and other libs.
I wrote following code for this purpose:
You have similar structure ->
<div class="parent">
<div class="child-one">
</div>
<div class="child-two">
</div>
</div>
JS:
scrollToElement() {
var parentElement = document.querySelector('.parent');
var childElement = document.querySelector('.child-two');
parentElement.scrollTop = childElement.offsetTop - parentElement.offsetTop;
}
We can easily rewrite this method for passing parent and child as an arguments
Another example of using jQuery and animate.
var container = $('#container');
var element = $('#element');
container.animate({
scrollTop: container.scrollTop = container.scrollTop() + element.offset().top - container.offset().top
}, {
duration: 1000,
specialEasing: {
width: 'linear',
height: 'easeOutBounce'
},
complete: function (e) {
console.log("animation completed");
}
});
None of other answer fixed my issue.
I played around with scrollIntoView arguments and managed to found a solution. Setting inline to start and block to nearest prevents parent element (or entire page) to scroll:
document.getElementById(chr).scrollIntoView({
behavior: 'smooth',
block: 'nearest',
inline: 'start'
});
There are two facts :
1) Component scrollIntoView is not supported by safari.
2) JS framework jQuery can do the job like this:
parent = 'some parent div has css position==="fixed"' || 'html, body';
$(parent).animate({scrollTop: $(child).offset().top}, duration)
Here's a simple pure JavaScript solution that works for a target Number (value for scrollTop), target DOM element, or some special String cases:
/**
* target - target to scroll to (DOM element, scrollTop Number, 'top', or 'bottom'
* containerEl - DOM element for the container with scrollbars
*/
var scrollToTarget = function(target, containerEl) {
// Moved up here for readability:
var isElement = target && target.nodeType === 1,
isNumber = Object.prototype.toString.call(target) === '[object Number]';
if (isElement) {
containerEl.scrollTop = target.offsetTop;
} else if (isNumber) {
containerEl.scrollTop = target;
} else if (target === 'bottom') {
containerEl.scrollTop = containerEl.scrollHeight - containerEl.offsetHeight;
} else if (target === 'top') {
containerEl.scrollTop = 0;
}
};
And here are some examples of usage:
// Scroll to the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget('top', scrollableDiv);
or
// Scroll to 200px from the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget(200, scrollableDiv);
or
// Scroll to targetElement
var scrollableDiv = document.getElementById('scrollable_div');
var targetElement= document.getElementById('target_element');
scrollToTarget(targetElement, scrollableDiv);
given you have a div element you need to scroll inside, try this piece of code
document.querySelector('div').scroll(x,y)
this works with me inside a div with a scroll, this should work with you in case you pointed the mouse over this element and then tried to scroll down or up. If it manually works, it should work too
User Animated Scrolling
Here's an example of how to programmatically scroll a <div> horizontally, without JQuery. To scroll vertically, you would replace JavaScript's writes to scrollLeft with scrollTop, instead.
JSFiddle
https://jsfiddle.net/fNPvf/38536/
HTML
<!-- Left Button. -->
<div style="float:left;">
<!-- (1) Whilst it's pressed, increment the scroll. When we release, clear the timer to stop recursive scroll calls. -->
<input type="button" value="«" style="height: 100px;" onmousedown="scroll('scroller',3, 10);" onmouseup="clearTimeout(TIMER_SCROLL);"/>
</div>
<!-- Contents to scroll. -->
<div id="scroller" style="float: left; width: 100px; height: 100px; overflow: hidden;">
<!-- <3 -->
<img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a" alt="image large" style="height: 100px" />
</div>
<!-- Right Button. -->
<div style="float:left;">
<!-- As (1). (Use a negative value of 'd' to decrease the scroll.) -->
<input type="button" value="»" style="height: 100px;" onmousedown="scroll('scroller',-3, 10);" onmouseup="clearTimeout(TIMER_SCROLL);"/>
</div>
JavaScript
// Declare the Shared Timer.
var TIMER_SCROLL;
/**
Scroll function.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scroll(id, d, del){
// Scroll the element.
document.getElementById(id).scrollLeft += d;
// Perform a delay before recursing this function again.
TIMER_SCROLL = setTimeout("scroll('"+id+"',"+d+", "+del+");", del);
}
Credit to Dux.
Auto Animated Scrolling
In addition, here are functions for scrolling a <div> fully to the left and right. The only thing we change here is we make a check to see if the full extension of the scroll has been utilised before making a recursive call to scroll again.
JSFiddle
https://jsfiddle.net/0nLc2fhh/1/
HTML
<!-- Left Button. -->
<div style="float:left;">
<!-- (1) Whilst it's pressed, increment the scroll. When we release, clear the timer to stop recursive scroll calls. -->
<input type="button" value="«" style="height: 100px;" onclick="scrollFullyLeft('scroller',3, 10);"/>
</div>
<!-- Contents to scroll. -->
<div id="scroller" style="float: left; width: 100px; height: 100px; overflow: hidden;">
<!-- <3 -->
<img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a" alt="image large" style="height: 100px" />
</div>
<!-- Right Button. -->
<div style="float:left;">
<!-- As (1). (Use a negative value of 'd' to decrease the scroll.) -->
<input type="button" value="»" style="height: 100px;" onclick="scrollFullyRight('scroller',3, 10);"/>
</div>
JavaScript
// Declare the Shared Timer.
var TIMER_SCROLL;
/**
Scroll fully left function; completely scrolls a <div> to the left, as far as it will go.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scrollFullyLeft(id, d, del){
// Fetch the element.
var el = document.getElementById(id);
// Scroll the element.
el.scrollLeft += d;
// Have we not finished scrolling yet?
if(el.scrollLeft < (el.scrollWidth - el.clientWidth)) {
TIMER_SCROLL = setTimeout("scrollFullyLeft('"+id+"',"+d+", "+del+");", del);
}
}
/**
Scroll fully right function; completely scrolls a <div> to the right, as far as it will go.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scrollFullyRight(id, d, del){
// Fetch the element.
var el = document.getElementById(id);
// Scroll the element.
el.scrollLeft -= d;
// Have we not finished scrolling yet?
if(el.scrollLeft > 0) {
TIMER_SCROLL = setTimeout("scrollFullyRight('"+id+"',"+d+", "+del+");", del);
}
}
This is what has finally served me
/** Set parent scroll to show element
* #param element {object} The HTML object to show
* #param parent {object} The HTML object where the element is shown */
var scrollToView = function(element, parent) {
//Algorithm: Accumulate the height of the previous elements and add half the height of the parent
var offsetAccumulator = 0;
parent = $(parent);
parent.children().each(function() {
if(this == element) {
return false; //brake each loop
}
offsetAccumulator += $(this).innerHeight();
});
parent.scrollTop(offsetAccumulator - parent.innerHeight()/2);
}
I needed to scroll a dynamically loading element on a page so my solution was a little more involved.
This will work on static elements that are not lazy loading data and data being dynamically loaded.
const smoothScrollElement = async (selector: string, scrollBy = 12, prevCurrPos = 0) => {
const wait = (timeout: number) => new Promise(resolve => setTimeout(resolve, timeout));
const el = document.querySelector(selector) as HTMLElement;
let positionToScrollTo = el.scrollHeight;
let currentPosition = Math.floor(el.scrollTop) || 0;
let pageYOffset = (el.clientHeight + currentPosition);
if (positionToScrollTo == pageYOffset) {
await wait(1000);
}
if ((prevCurrPos > 0 && currentPosition <= prevCurrPos) !== true) {
setTimeout(async () => {
el.scrollBy(0, scrollBy);
await smoothScrollElement(selector, scrollBy, currentPosition);
}, scrollBy);
}
};
browser does scrolling automatically to an element that gets focus, so what you can also do it to wrap the element that you need to be scrolled to into <a>...</a> and then when you need scroll just set the focus on that a
Related
I'm making a small game in JavaScript. I've created a small example js fiddle demo link. There are three situations as listed bellow:
A: Outside of target object.
B: Overlaping with target object's border.
C: Inside of target object.
According to Have object detect if completely inside other object JavaScript, I've known how to detect if the object inside of target (Situation C). How about situation A and B?
<div class="main">
<div class="target"></div>
<div class="obj">A</div>
<div style="top:15%; left:50%;" class="obj">B</div>
<div style="top:25%; left:35%;" class="obj">C</div>
</div>
One way to do this would be to use Element#getBoundingClientRect() to obtain the absolute coordinates of the DOM elements being classified for overlap, containment, etc.
This function returns to top, right, bottom and left coordiates of the corresponding DOM element which you can use to determine containment of an element with respect to a container.
You could implement a function like findContainment() shown below, where the containment of element is classified against a container element:
function findContainment(element, container) {
/*
Obtain the bounding rectangle for each element
*/
const brE = element.getBoundingClientRect()
const brC = container.getBoundingClientRect()
/*
If the boundaries of container pass through the boundaries of
element then classifiy this as an overlap
*/
if (
/* Does container left or right edge pass through element? */
(brE.left < brC.left && brE.right > brC.left) ||
(brE.left < brC.right && brE.right > brC.right) ||
/* Does container top or bottom edge pass through element? */
(brE.top < brC.top && brE.bottom > brC.top) ||
(brE.top < brC.bottom && brE.bottom > brC.bottom)) {
return "overlap";
}
/*
If boundaries of element fully contained inside bounday of
container, classify this as containment of element in container
*/
if (
brE.left >= brC.left &&
brE.top >= brC.top &&
brE.bottom <= brC.bottom &&
brE.right <= brC.right
) {
return "contained"
}
/*
Otherwise, the element is fully outside the container
*/
return "outside"
}
const main = document.querySelector(".main")
console.log("A", findContainment(document.querySelector(".a"), main))
console.log("B", findContainment(document.querySelector(".b"), main))
console.log("C", findContainment(document.querySelector(".c"), main))
console.log("D", findContainment(document.querySelector(".d"), main))
console.log("E", findContainment(document.querySelector(".e"), main))
.main {
width: 50%;
height: 200px;
border: 5px solid #000;
position: relative;
}
.obj {
width: 40px;
height: 40px;
border: 1px solid blue;
position: absolute;
}
<div class="main">
<div style="top:105%; left:25%;" class="obj a">A</div>
<div style="top:15%; left:-5%;" class="obj b">B</div>
<div style="top:20%; left:40%;" class="obj c">C</div>
<div style="top:20%; left:110%;" class="obj d">D</div>
<div style="top:90%; left:95%;" class="obj e">E</div>
</div>
Here's a working fiddle as well - hope that helps!
I'm trying to create a roll up div while mouse is over another div. It opens but I'd like it not to close when leaving through the bottom border. Is it possible using JS or JQuery? Here is my current code:
$("#sell1").mouseenter(function(){
$("#rollup1").css("display","inline");
});
$("#rollup1").mouseleave(function(){
$("#rollup1").css("display","none");
});
$("#sell1").mouseleave(function(){
$("#rollup1").css("display","none");
});
When processing the mouseleave, you can get the dimensions of the element and see whether the event's pageY is below the element:
$("#rollup1").mouseenter(function() {
$("#status").text("Over the element...");
});
$("#rollup1").mouseleave(function(e) {
var $this = $(this);
var bottom = $this.offset().top + $this.height();
if (bottom < e.pageY) {
$("#status").text("Left via bottom edge");
} else {
$("#status").text("Left NOT via bottom edge");
}
});
#rollup1 {
width: 50px;
height: 50px;
border: 1px solid black;
}
<div id="status"> </div>
<div id="rollup1"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
I Want to show div on click with slideup effect using javascript(not jquery).
Here is my HTML code:-
<div class="title-box">show text</div>
<div class="box"><span class="activity-title">our regions bla bla</span></div>
Kindly advise me asap.
The question states that the solution needs to be done with pure JavaScript as opposed to jQuery, but it does not preclude the use of CSS. I would argue that CSS is the best approach because the slide effect is presentational.
See http://jsfiddle.net/L9s13nhf/
<html><head>
<style type="text/css">
#d {
height: 100px;
width: 100px;
border: 1px solid red;
margin-top: -200px;
transition: margin-top 2s;
}
#d.shown {
margin-top: 100px;
}
</style>
</head>
<body>
<button id="b">Toggle slide</button>
<div id="d">Weeeeeeee</div>
<script type="text/javascript">
var b = document.getElementById('b');
var d = document.getElementById('d');
b.addEventListener('click', function() {
d.classList.toggle('shown');
});
</script>
</body></html>
The basic algorithm is to add a class to the element you want to slide in/out whenever some button or link is clicked (I'd also argue that a button is more semantically appropriate here than an anchor tag which is more for linking web pages).
The CSS kicks in automatically and updates the margin-top of the sliding element to be visible on-screen. The transition property of the element tells the browser to animate the margin-top property for two seconds.
You can try below code:
Working Demo
document.getElementById('bar').onclick = (function()
{
var that, interval, step = 20,
id = document.getElementById('foo'),
handler = function()
{
that = that || this;
that.onclick = null;
id = document.getElementById('foo');
interval =setInterval (function()
{
id.style.top = (parseInt(id.style.top, 10) + step)+ 'px';
if (id.style.top === '0px' || id.style.top === '400px')
{
that.onclick = handler;
clearInterval(interval);
if (id.style.top === '400px')
{
id.style.display = 'none';
}
step *= -1;
}
else
{
id.style.display = 'block';
}
},100);
};
return handler;
}());
You can refer following below:
<div class="title-box">
show text
</div>
<div class="box" id="slidedown_demo" style="width:100px; height:80px; background:#ccc; text-align:center;">
<span class="activity-title">our regions bla bla</span>
</div>
I am creating my product pages by using the object tag code, but every time I click the "view" button, the next page is staying at the same position of previous page which I just viewed. How can I add functionality that will let me view from the top of page every time I click the "view" button?
<div id="container" class="clearfix"><!--! end of #sidebar -->
<div class="holder"></div>
<div id="content" class="defaults"><!-- navigation holder -->
<div id="title2">Office Section</div>
<!-- item container -->
<ul id="itemContainer">
<li>
<div id="product">
<div id="title">FuBang®</div>
<div class="imageOuter" style="margin:0">
<a class="image" href="officesection010.html">
<span class="rollover" ></span>
<img class="imgborder" src="product/officesection/010.jpg" width="165" height="165" />
</a>
</div><br />
<div id="text">Sofa </div><br />
<div id="button">
View Details
</div>
</div>
</li>
</ul>
<br />
<div id="title2"></div>
<div class="holder"></div>
</div>
</div> <!--! end of #content -->
</div> <!--! end of #container -->
When I click the "View Details" button at a specific position "x" here: http://postimg.org/image/vgs0lwhtr/
The next page shows the same position "x", but I want it to jump to the top of page:
http://postimg.org/image/vn80e2lph/
Using Javascript:
document.body.scrollTop = document.documentElement.scrollTop = 0;
Using jQuery:
$(function() {
$('body').scrollTop(0);
});
jQuery(document).ready(function($){
$(window).scroll(function(){
if ($(this).scrollTop() > 50) {
$('#backToTop').fadeIn('slow');
} else {
$('#backToTop').fadeOut('slow');
}
});
$('#backToTop').click(function(){
$("html, body").animate({ scrollTop: 0 }, 500);
//$("html, body").scrollTop(0); //For without animation
return false;
});
});
please refere this, may this help
Sometimes placing scroll to body doesn't work if your current content is generated through jQuery (as it was in my case). In such situation you can just do following.
$(function() {
$('html').scrollTop(0);
});
A small issue with Subhash's jQuery solution is that you must call this code within $(document).ready() in order for your $('body') selector to work. The ready event may not fire before parts of your page have been rendered to the screen.
An better approach is to simply modify the user's location as a work-around to this browser 'feature':
//Above all of your $(document).ready(...) code
document.location = "#";
Simple HTML solution for jumping between page parts
// Place a tag like this where you would like to go
// in your case at the top
<a name="top"></a>
// you will reach there by click of this link better use an image reach their by clicking on this we can also use an image, align in right
last
Back to top button, works in all browsers.To change the scroll speed simply change the x in counter -= x here x = 10
function scrollToTop(){
var myBody = document.body;
var id = setInterval(secondFunction,1);
var height = window.pageYOffset;
var counter = height;
function secondFunction(){
if(window.pageYOffset == 0){
clearInterval(id);
}
else {
if(!!navigator.userAgent.match(/Trident/g) || !!navigator.userAgent.match(/MSIE/g)){
counter -= 10;
counter--;
document.documentElement.scrollTop = counter;
}
else {
counter -= 10;
counter--;
myBody.scrollTop = counter;
}
}
}
}
body {
height: 5000px;
margin: 0;
padding: 0;
}
.backToTop {
position: fixed;
/* Fixed at page */
top: auto;
bottom: 20px;
left: auto;
right: 20px;
background-color: crimson;
color: white;
padding: 5px;
cursor: pointer;
}
header {
position: relative;
top: 0;
left: 0;
width: 100%;
height: 100px;
background-color: black;
}
<!-- back to top button -->
<span class="backToTop" onclick="scrollToTop()">TOP</span>
<!-- Header -->
<header>
</header>
Assign an id="#body" and tabindex in the <body> tag
<body id="#body" tabindex="1">
and use jquery focus()
$(function() {
$("#body").attr("tabindex",-1).focus();
}
You can use this method:
function gototop() {
if (window.scrollY>0) {
window.scrollTo(0,window.scrollY-20)
setTimeout("gototop()",10)
}
}
I want to be able to move an object from one position to another using buttons for example 3 buttons left right and center that always put the object at the exact same positions everytime.
I have tried using style.position="absolute" but it moves left or right or whatever position depending on it last position never the same three positions.
Which one of static, absolute, fixed, relative, inherit would be best to use in this case? and is it possible to get an example of how a particular object would be set to a particular position thanks in advance
position: absolute tells the browser HOW to position your element, but not WHERE to position your element. You still need to position your element by setting left or right and top or bottom values in your css.
Given some markup:
<button id="left">LEFT</button>
<button id="right">RIGHT</button>
<button id="center">CENTER</button>
<div id="wrapper">
<div id="thingy"/>
</div>
and some styles:
#wrapper {
position: relative;
margin-top: 10px;
}
#thingy {
margin: 0 auto;
width: 25px;
height: 25px;
background-color: #f69;
}
You can move the thingy this way:
var thingy = document.getElementById('thingy');
document.getElementById('left').onclick = function() {
thingy.style.position = 'absolute';
thingy.style.right = null;
thingy.style.left = 0;
};
document.getElementById('right').onclick = function() {
thingy.style.position = 'absolute';
thingy.style.left = null;
thingy.style.right = 0;
};
document.getElementById('center').onclick = function() {
thingy.style.position = 'inherit';
thingy.style.left = null;
thingy.style.right = null;
};
Code is posted at: http://jsfiddle.net/TXWfh/1/
You could make it work with absolute, but I think relative might work best in your case.
HTML
<div id="test"></div>
<input type="button" id="left" value="Left">
<input type="button" id="middle" value="Middle">
<input type="button" id="right" value="Right">
CSS
#test {
position: relative;
width: 100px;
height: 100px;
background-color: red;
}
input {
padding: 4px;
}
JavaScript
var test = document.getElementById("test");
document.getElementById("left").onclick = function() {
test.style.left = "0px";
};
document.getElementById("middle").onclick = function() {
test.style.left = "250px";
};
document.getElementById("right").onclick = function() {
test.style.left = "500px";
};
Live example
Don't know what you are trying to do, but it really doesn't matter if you don't have a lot of surrounding html code that can get affected by your choice of position value.
following 3 fiddles do same things but with subtle difference that they have different value for position attribute.
http://jsfiddle.net/9uQT8/3/
http://jsfiddle.net/9uQT8/4/
http://jsfiddle.net/9uQT8/5/
try clicking left center right. and see. I used jQuery though, super cool JS framework.