I've been searching on many posts but almost all of them are confusing.
I'm working with animate.css into a which is at the middle of my page.
For default the animation is played when the page is loaded, but i want that it play when i reach the (when i'm scrolling).
Please, don't say about JS Reveal, i'd like to use the animation from animate.css
What i was trying:
HTML
<!-- Others div above -->
<div class="row sf-medida" id="sf-medida" onscroll="Animar();">
<!-- Others div below -->
JS
function Animar() {
setTimeout(function(){
document.getElementById("sf-medida").style.visibility = "visible";
$("#titulo-general").addClass("animated fadeInLeft");
$(".sub-titulo").addClass("animated bounceInRight");
$(".titulo-izquierda").addClass("animated swing");
$(".texto-1").addClass("animated fadeIn");
$(".texto-2").addClass("animated fadeIn");
},1000)
}
But it doesn't work, however, i've tried adding
window.addEventListener("scroll", Animar);
But what it does is that the animation is played whenever i scroll on the page,
This can be very easily done using little jquery. All you need to do is listen to the scroll event, then check if user have scrolled to the target element. If the user did, then add animation class from your animate.css. Adjust your if condition according to your desires. Check the below code and fiddle https://jsfiddle.net/15z6x5ko/ for reference
$(document).ready(function(){
$(document).scroll(function(evt){
var v2 = Math.abs($('.box').position().top - $(window).height()/2);
var v1 = $(this).scrollTop();
if( v1 > v2 ){
console.log('in');
$('.box').addClass('animated flip')
}
});
});
So as per your request, let me try to explain the code line by line
$(document).ready(function(){
This is easy to understand. It just waits for browser to load all HTML & CSS first and when everything is loaded, the javascript code inside this function will run.
$(document).scroll(function(evt){
This is an event handler, our callback function will run whenever user scrolls on document. Remember change $(document) according whatever the parent is of your target element. So if your target div is inside another div whose class is .parent then use $('.parent').scroll . As for my code I am listening the event on document. When my document scrolls, my event will trigger.
var v1 = $(this).scrollTop();
This code will get the amount of scrolling user had done in pixels.
var v2 = Math.abs($('.box').position().top - $(window).height()/2);
This is a simple math that checks the position of my target div from its parent element subtracting the half of the size of window from it. This will return the pixel positing of your target div. So when user reaches this pixel positing while scrolling, your animation will start.
$('.box').addClass('animated flip')
Now this code simply adds the animation css classes into the target div as soon as user scrolls to the target div.
I'm using "WoW.js" for my scroll reveal library. It's pretty easy to use, like for real. One line of code
<div class="wow fadeIn">content</div>
Here, take a look: http://mynameismatthieu.com/WOW/docs.html
Here's an example using Jquery.
In it we use .scrollTop and .height to measure the videos container from the top of the page so that we know when it comes into view when scrolling. (it's actually set to load when it reaches 100px below the bottom of the viewable area, a sort of preload. you can adjust it to whatever you like.)
The video load is done by copying the url from data-src= into src= when the video container is at the desired spot on the page. (in this case, 100px below the viewable area)
fiddle
note, the video won't load on stack so be sure to view the fiddle
https://jsfiddle.net/Hastig/xszu6b1p/
I scraped it together from these two answers..
Youtube Autoplay
Ladyload Images
$(window).scroll(function() {
$.each($('iframe'), function() {
if ( $(this).attr('data-src') && $(this).offset().top < ($(window).scrollTop() + $(window).height() + 100) ) {
var source = $(this).data('src');
$(this).attr('src', source);
$(this).removeAttr('data-src');
}
})
})
body {
margin: 0;
}
.filler {
display: flex;
justify-content: center;
align-items: center;
height: 800px;
}
.filler-top { background-color: blue }
.filler-btm { background-color: green; }
.video-container {
/* css tricks - responsive iframe video */
/* https://css-tricks.com/NetMag/FluidWidthVideo/Article-FluidWidthVideo.php */
position: relative;
padding-bottom: 56.25%; /* 16:9 */
padding-top: 25px;
height: 0;
display: flex;
justify-content: center;
background-color: red;
}
.video-container iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="filler filler-top">filler top</div>
<div class="video-container">
<iframe data-src="https://www.youtube.com/embed/f0JDs4FY8cQ?rel=0&autoplay=1"></iframe>
</div>
<div class="filler filler-btm">filler bottom</div>
When you drag an file on browser screen, an image appear side of mouse cursor that is windows default image. This images is various like Copy, Move and Forbide. See its at bottom.
How can i change image side of mouse cursor to this images using javascript or JQuery? For example when i drag a file and move mouse in undragable area, forbiden image display side of cursor.
You can use the dataTransfer.dropEffect property of the dragover event to set the small image besides the cursor:
$(".targetDiv").on("dragover", function (event) {
event.preventDefault();
event.originalEvent.dataTransfer.dropEffect = "none"; // Shows the "forbidden" image
});
The values for that property are copy, move, link and none. You can test these values in the code snippet below. Please note that the originalEvent must be used. According to my tests, it works in Firefox and Chrome but not in IE.
$(function () {
$(".targetDiv").on("dragover", function (event) {
event.preventDefault();
event.originalEvent.dataTransfer.dropEffect = event.target.getAttribute("data-effect");
});
});
.targetDiv
{
display: inline-block;
border: solid 1px black;
width: 80px;
height: 50px;
margin: 4px;
text-align: center;
line-height: 50px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Drag a file over each block </p>
<div>
<div data-effect="link" class="targetDiv">Link</div>
<div data-effect="move" class="targetDiv">Move</div>
</div>
<div>
<div data-effect="copy" class="targetDiv">Copy</div>
<div data-effect="none" class="targetDiv">None</div>
</div>
You can change the cursor image by changing the property of the cursor by css using jquery.
function ondrag(event) {
$('body').css('cursor', 'wait');
}
You can check the various cursor property here.
http://www.w3schools.com/cssref/pr_class_cursor.asp
If you want to replace the cursor with a custom image you can use this:
https://github.com/Webbrother/jquery.change-cursor
If you want to limit draggables to a certain area,
Try using "containment" option:
http://docs.jquery.com/UI/Draggable#option-containment
You can do it with jquery draggable
Here is the preview what i have done
$( ".your_image" ).draggable({
drag: function() {
$(".your_image").css("cursor","url(https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/actions/move.png), auto");
},
stop: function() {
$(".your_image").css("cursor","url(https://cdn4.iconfinder.com/data/icons/32x32-free-design-icons/32/Copy.png), auto");
}
});
.your_image{
height:100px;
width:100px;
background-color:red;
cursor:url(https://cdn4.iconfinder.com/data/icons/32x32-free-design-icons/32/Copy.png), auto;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<div>
<div class="your_image">
</div>
</div>
<div class="log">
</div>
This question already has answers here:
Fixed page header overlaps in-page anchors
(38 answers)
Closed 7 years ago.
I am trying to clean up the way my anchors work. I have a header that is fixed to the top of the page, so when you link to an anchor elsewhere in the page, the page jumps so the anchor is at the top of the page, leaving the content behind the fixed header (I hope that makes sense). I need a way to offset the anchor by the 25px from the height of the header. I would prefer HTML or CSS, but Javascript would be acceptable as well.
You could just use CSS without any javascript.
Give your anchor a class:
<a class="anchor" id="top"></a>
You can then position the anchor an offset higher or lower than where it actually appears on the page, by making it a block element and relatively positioning it. -250px will position the anchor up 250px
a.anchor {
display: block;
position: relative;
top: -250px;
visibility: hidden;
}
I found this solution:
<a name="myanchor">
<h1 style="padding-top: 40px; margin-top: -40px;">My anchor</h1>
</a>
This doesn't create any gap in the content and anchor links works really nice.
I was looking for a solution to this as well. In my case, it was pretty easy.
I have a list menu with all the links:
<ul>
<li>one</li>
<li>two</li>
<li>three</li>
<li>four</li>
</ul>
And below that the headings where it should go to.
<h3>one</h3>
<p>text here</p>
<h3>two</h3>
<p>text here</p>
<h3>three</h3>
<p>text here</p>
<h3>four</h3>
<p>text here</p>
Now because I have a fixed menu at the top of my page I can't just make it go to my tag because that would be behind the menu.
Instead, I put a span tag inside my tag with the proper id.
<h3><span id="one"></span>one</h3>
Now use 2 lines of CSS to position them properly.
h3{ position:relative; }
h3 span{ position:absolute; top:-200px;}
Change the top value to match the height of your fixed header (or more).
Now I assume this would work with other elements as well.
FWIW this worked for me:
[id]::before {
content: '';
display: block;
height: 75px;
margin-top: -75px;
visibility: hidden;
}
As this is a concern of presentation, a pure CSS solution would be ideal. However, this question was posed in 2012, and although relative positioning / negative margin solutions have been suggested, these approaches seem rather hacky, create potential flow issues, and cannot respond dynamically to changes in the DOM / viewport.
With that in mind I believe that using JavaScript is still (February 2017) the best approach. Below is a vanilla-JS solution which will respond both to anchor clicks and resolve the page hash on load (See JSFiddle). Modify the .getFixedOffset() method if dynamic calculations are required. If you're using jQuery, here's a modified solution with better event delegation and smooth scrolling.
(function(document, history, location) {
var HISTORY_SUPPORT = !!(history && history.pushState);
var anchorScrolls = {
ANCHOR_REGEX: /^#[^ ]+$/,
OFFSET_HEIGHT_PX: 50,
/**
* Establish events, and fix initial scroll position if a hash is provided.
*/
init: function() {
this.scrollToCurrent();
window.addEventListener('hashchange', this.scrollToCurrent.bind(this));
document.body.addEventListener('click', this.delegateAnchors.bind(this));
},
/**
* Return the offset amount to deduct from the normal scroll position.
* Modify as appropriate to allow for dynamic calculations
*/
getFixedOffset: function() {
return this.OFFSET_HEIGHT_PX;
},
/**
* If the provided href is an anchor which resolves to an element on the
* page, scroll to it.
* #param {String} href
* #return {Boolean} - Was the href an anchor.
*/
scrollIfAnchor: function(href, pushToHistory) {
var match, rect, anchorOffset;
if(!this.ANCHOR_REGEX.test(href)) {
return false;
}
match = document.getElementById(href.slice(1));
if(match) {
rect = match.getBoundingClientRect();
anchorOffset = window.pageYOffset + rect.top - this.getFixedOffset();
window.scrollTo(window.pageXOffset, anchorOffset);
// Add the state to history as-per normal anchor links
if(HISTORY_SUPPORT && pushToHistory) {
history.pushState({}, document.title, location.pathname + href);
}
}
return !!match;
},
/**
* Attempt to scroll to the current location's hash.
*/
scrollToCurrent: function() {
this.scrollIfAnchor(window.location.hash);
},
/**
* If the click event's target was an anchor, fix the scroll position.
*/
delegateAnchors: function(e) {
var elem = e.target;
if(
elem.nodeName === 'A' &&
this.scrollIfAnchor(elem.getAttribute('href'), true)
) {
e.preventDefault();
}
}
};
window.addEventListener(
'DOMContentLoaded', anchorScrolls.init.bind(anchorScrolls)
);
})(window.document, window.history, window.location);
Pure css solution inspired by Alexander Savin:
a[name] {
padding-top: 40px;
margin-top: -40px;
display: inline-block; /* required for webkit browsers */
}
Optionally you may want to add the following if the target is still off the screen:
vertical-align: top;
My solution combines the target and before selectors for our CMS. Other techniques don't account for text in the anchor. Adjust the height and the negative margin to the offset you need...
:target::before {
content: '';
display: block;
height: 180px;
margin-top: -180px;
}
This takes many elements from previous answers and combines into a tiny (194 bytes minified) anonymous jQuery function. Adjust fixedElementHeight for the height of your menu or blocking element.
(function($, window) {
var adjustAnchor = function() {
var $anchor = $(':target'),
fixedElementHeight = 100;
if ($anchor.length > 0) {
$('html, body')
.stop()
.animate({
scrollTop: $anchor.offset().top - fixedElementHeight
}, 200);
}
};
$(window).on('hashchange load', function() {
adjustAnchor();
});
})(jQuery, window);
If you don't like the animation, replace
$('html, body')
.stop()
.animate({
scrollTop: $anchor.offset().top - fixedElementHeight
}, 200);
with:
window.scrollTo(0, $anchor.offset().top - fixedElementHeight);
Uglified version:
!function(o,n){var t=function(){var n=o(":target"),t=100;n.length>0&&o("html, body").stop().animate({scrollTop:n.offset().top-t},200)};o(n).on("hashchange load",function(){t()})}(jQuery,window);
For modern browsers, just add the CSS3 :target selector to the page. This will apply to all the anchors automatically.
:target {
display: block;
position: relative;
top: -100px;
visibility: hidden;
}
You can do it without js and without altering html. It´s css-only.
a[id]::before {
content: '';
display: block;
height: 50px;
margin: -30px 0 0;
}
That will append a pseudo-element before every a-tag with an id. Adjust values to match the height of your header.
I had been facing a similar issue, unfortunately after implementing all the solutions above, I came to the following conclusion.
My inner elements had a fragile CSS structure and implementing a position relative / absolute play, was completely breaking the page design.
CSS is not my strong suit.
I wrote this simple scrolling js, that accounts for the offset caused due to the header and relocated the div about 125 pixels below. Please use it as you see fit.
The HTML
<div id="#anchor"></div> <!-- #anchor here is the anchor tag which is on your URL -->
The JavaScript
$(function() {
$('a[href*=#]:not([href=#])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
&& location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top - 125 //offsets for fixed header
}, 1000);
return false;
}
}
});
//Executed on page load with URL containing an anchor tag.
if($(location.href.split("#")[1])) {
var target = $('#'+location.href.split("#")[1]);
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top - 125 //offset height of header here too.
}, 1000);
return false;
}
}
});
See a live implementation here.
For the same issue, I used an easy solution : put a padding-top of 40px on each anchor.
As #moeffju suggests, this can be achieved with CSS. The issue I ran into (which I'm surprised I haven't seen discussed) is the trick of overlapping previous elements with padding or a transparent border prevents hover and click actions at the bottom of those sections because the following one comes higher in the z-order.
The best fix I found was to place section content in a div that is at z-index: 1:
// Apply to elements that serve as anchors
.offset-anchor {
border-top: 75px solid transparent;
margin: -75px 0 0;
-webkit-background-clip: padding-box;
-moz-background-clip: padding;
background-clip: padding-box;
}
// Because offset-anchor causes sections to overlap the bottom of previous ones,
// we need to put content higher so links aren't blocked by the transparent border.
.container {
position: relative;
z-index: 1;
}
Solutions with changing position property are not always possible (it can destroy layout) therefore I suggest this:
HTML:
<a id="top">Anchor</a>
CSS:
#top {
margin-top: -250px;
padding-top: 250px;
}
Use this:
<a id="top"> </a>
to minimize overlapping, and set font-size to 1px. Empty anchor will not work in some browsers.
Borrowing some of the code from an answer given at this link (no author is specified), you can include a nice smooth-scroll effect to the anchor, while making it stop at -60px above the anchor, fitting nicely underneath the fixed bootstrap navigation bar (requires jQuery):
$(".dropdown-menu a[href^='#']").on('click', function(e) {
// prevent default anchor click behavior
e.preventDefault();
// animate
$('html, body').animate({
scrollTop: $(this.hash).offset().top - 60
}, 300, function(){
});
});
The above methods don't work very well if your anchor is a table element or within a table (row or cell).
I had to use javascript and bind to the window hashchange event to work around this (demo):
function moveUnderNav() {
var $el, h = window.location.hash;
if (h) {
$el = $(h);
if ($el.length && $el.closest('table').length) {
$('body').scrollTop( $el.closest('table, tr').position().top - 26 );
}
}
}
$(window)
.load(function () {
moveUnderNav();
})
.on('hashchange', function () {
moveUnderNav();
});
* Note: The hashchange event is not available in all browsers.
You can achieve this without an ID using the a[name]:not([href]) css selector. This simply looks for links with a name and no href e.g. <a name="anc1"></a>
An example rule might be:
a[name]:not([href]){
display: block;
position: relative;
top: -100px;
visibility: hidden;
}
Instead of having a fixed-position navbar which is underlapped by the rest of the content of the page (with the whole page body being scrollable), consider instead having a non-scrollable body with a static navbar and then having the page content in an absolutely-positioned scrollable div below.
That is, have HTML like this...
<div class="static-navbar">NAVBAR</div>
<div class="scrollable-content">
<p>Bla bla bla</p>
<p>Yadda yadda yadda</p>
<p>Mary had a little lamb</p>
<h2 id="stuff-i-want-to-link-to">Stuff</h2>
<p>More nonsense</p>
</div>
... and CSS like this:
.static-navbar {
height: 100px;
}
.scrollable-content {
position: absolute;
top: 100px;
bottom: 0;
overflow-y: scroll;
width: 100%;
}
There is one significant downside to this approach, however, which is that while an element from the page header is focused, the user will not be able to scroll the page using the keyboard (e.g. via the up and down arrows or the Page Up and Page Down keys).
Here's a JSFiddle demonstrating this in action.
This was inspired by the answer by Shouvik - same concept as his, only the size of the fixed header isn't hard coded. As long as your fixed header is in the first header node, this should "just work"
/*jslint browser: true, plusplus: true, regexp: true */
function anchorScroll(fragment) {
"use strict";
var amount, ttarget;
amount = $('header').height();
ttarget = $('#' + fragment);
$('html,body').animate({ scrollTop: ttarget.offset().top - amount }, 250);
return false;
}
function outsideToHash() {
"use strict";
var fragment;
if (window.location.hash) {
fragment = window.location.hash.substring(1);
anchorScroll(fragment);
}
}
function insideToHash(nnode) {
"use strict";
var fragment;
fragment = $(nnode).attr('href').substring(1);
anchorScroll(fragment);
}
$(document).ready(function () {
"use strict";
$("a[href^='#']").bind('click', function () {insideToHash(this); });
outsideToHash();
});
I'm facing this problem in a TYPO3 website, where all "Content Elements" are wrapped with something like:
<div id="c1234" class="contentElement">...</div>
and i changed the rendering so it renders like this:
<div id="c1234" class="anchor"></div>
<div class="contentElement">...</div>
And this CSS:
.anchor{
position: relative;
top: -50px;
}
The fixed topbar being 40px high, now the anchors work again and start 10px under the topbar.
Only drawback of this technique is you can no longer use :target.
Adding to Ziav's answer (with thanks to Alexander Savin), I need to be using the old-school <a name="...">...</a> as we're using <div id="...">...</div> for another purpose in our code. I had some display issues using display: inline-block -- the first line of every <p> element was turning out to be slightly right-indented (on both Webkit and Firefox browsers). I ended up trying other display values and display: table-caption works perfectly for me.
.anchor {
padding-top: 60px;
margin-top: -60px;
display: table-caption;
}
I added 40px-height .vspace element holding the anchor before each of my h1 elements.
<div class="vspace" id="gherkin"></div>
<div class="page-header">
<h1>Gherkin</h1>
</div>
In the CSS:
.vspace { height: 40px;}
It's working great and the space is not chocking.
how about hidden span tags with linkable IDs that provide the height of the navbar:
#head1 {
padding-top: 60px;
height: 0px;
visibility: hidden;
}
<span class="head1">somecontent</span>
<h5 id="headline1">This Headline is not obscured</h5>
heres the fiddle: http://jsfiddle.net/N6f2f/7
You can also add an anchor with follow attr:
(text-indent:-99999px;)
visibility: hidden;
position:absolute;
top:-80px;
and give the parent container a position relative.
Works perfect for me.
A further twist to the excellent answer from #Jan is to incorporate this into the #uberbar fixed header, which uses jQuery (or MooTools). (http://davidwalsh.name/persistent-header-opacity)
I've tweaked the code so the the top of the content is always below not under the fixed header and also added the anchors from #Jan again making sure that the anchors are always positioned below the fixed header.
The CSS:
#uberbar {
border-bottom:1px solid #0000cc;
position:fixed;
top:0;
left:0;
z-index:2000;
width:100%;
}
a.anchor {
display: block;
position: relative;
visibility: hidden;
}
The jQuery (including tweaks to both the #uberbar and the anchor approaches:
<script type="text/javascript">
$(document).ready(function() {
(function() {
//settings
var fadeSpeed = 200, fadeTo = 0.85, topDistance = 30;
var topbarME = function() { $('#uberbar').fadeTo(fadeSpeed,1); }, topbarML = function() { $('#uberbar').fadeTo(fadeSpeed,fadeTo); };
var inside = false;
//do
$(window).scroll(function() {
position = $(window).scrollTop();
if(position > topDistance && !inside) {
//add events
topbarML();
$('#uberbar').bind('mouseenter',topbarME);
$('#uberbar').bind('mouseleave',topbarML);
inside = true;
}
else if (position < topDistance){
topbarME();
$('#uberbar').unbind('mouseenter',topbarME);
$('#uberbar').unbind('mouseleave',topbarML);
inside = false;
}
});
$('#content').css({'margin-top': $('#uberbar').outerHeight(true)});
$('a.anchor').css({'top': - $('#uberbar').outerHeight(true)});
})();
});
</script>
And finally the HTML:
<div id="uberbar">
<!--CONTENT OF FIXED HEADER-->
</div>
....
<div id="content">
<!--MAIN CONTENT-->
....
<a class="anchor" id="anchor1"></a>
....
<a class="anchor" id="anchor2"></a>
....
</div>
Maybe this is useful to somebody who likes the #uberbar fading dixed header!
#AlexanderSavin's solution works great in WebKit browsers for me.
I additionally had to use :target pseudo-class which applies style to the selected anchor to adjust padding in FF, Opera & IE9:
a:target {
padding-top: 40px
}
Note that this style is not for Chrome / Safari so you'll probably have to use css-hacks, conditional comments etc.
Also I'd like to notice that Alexander's solution works due to the fact that targeted element is inline. If you don't want link you could simply change display property:
<div id="myanchor" style="display: inline">
<h1 style="padding-top: 40px; margin-top: -40px;">My anchor</h1>
</div>
Here's the solution that we use on our site. Adjust the headerHeight variable to whatever your header height is. Add the js-scroll class to the anchor that should scroll on click.
// SCROLL ON CLICK
// --------------------------------------------------------------------------
$('.js-scroll').click(function(){
var headerHeight = 60;
$('html, body').animate({
scrollTop: $( $.attr(this, 'href') ).offset().top - headerHeight
}, 500);
return false;
});
I ran into this same issue and ended up handling the click events manually, like:
$('#mynav a').click(() ->
$('html, body').animate({
scrollTop: $($(this).attr('href')).offset().top - 40
}, 200
return false
)
Scroll animation optional, of course.