In my project I need to animate some element, change its height with animation and I'm not allowed to use jQuery. I'm having hard time converting the following code (only the animation part) to vanilla js:
jsfiddle
$("#button").click(function() {
$("#div").height(20).animate({
height: 50
}, 200);
})
Vanilla JS doesn't have any animation routines. To do this you'll need to write your own timers to update the properties of the element at the required intervals.
However a better alternative would be to do the animation in CSS and use JS to simply add a class to the element which triggers the animation, something like this:
document.getElementById('button').addEventListener('click', function() {
document.getElementById('div').classList.add('foo');
})
#div {
height: 20px;
width: 50px;
border: 1px solid red;
transition: height 0.2s;
}
#div.foo {
height: 50px;
}
<div id="div"></div>
<button id="button">animate height</button>
Note the transition rule on the #div is what is doing the animation magic here.
Related
Hi i a wondering what is the best way to resize a div for a time frame say 5 seconds after a button is clicked. what is the best solution to do this javascript or jquery
You will have to use javascript in order to do anything on the button click.
If it was me - I would add a class to the div on the click, and set a time out to remove the class. The class would have the altered styling that would affect the size of the div. In this demo - I am making the target div twice as big for a time of 2 seconds and then reoving the class to return the div back to ormal.
Note that there are numerous ways to alter the size of the div, but you will need to use javascript to trigger them. You don't need the jQuery library just this though- straight js can do it. You should investigate some of the funky CSS ways to affecting DOM elements to get a nice smooth transition or altertion.
function alterSize(type) {
var targetDiv = document.querySelector("#target-div");
targetDiv.classList.add(type);
setTimeout(function(){
targetDiv.classList.remove(type);
}, 2000)
}
#target-div {
height: 100px;
width: 100px;
border: solid 1px blue;
background: #efefef;
transition: all 0.5s ease-in-out;
}
#target-div.small {
height: 50px;
width: 50px;
}
#target-div.large {
height: 200px;
width: 200px;
}
<button type="button" onclick="alterSize('small')">Click me to decrease the size</button>
<button type="button" onclick="alterSize('large')">Click me to increase the size</button>
<hr/>
<div id="target-div">
I was reading this article http://semisignal.com/?p=5298 and the author wrote that
"Reflow needs to be triggered before the invisible class is removed in order for the transition to work as expected. "
My questions are :
1) Why does reflow need to be triggered?
2) I understand that we should avoid using reflow, if that is true why is the author suggesting to use reflow in order to make the transition work?
3) Instead of using reflow, is there a different method to make the transition work?
Thank you.
(Effectively: "Why can't I easily use transitions with the display property")
Short Answer:
CSS Transitions rely on starting or static properties of an element. When an element is set to display: none; the document (DOM) is rendered as though the element doesn't exist. This means when it's set to display: block; - There are no starting values for it to transition.
Longer Answer:
Reflow needs to be triggered because elements set to display: none; are not drawn in the document yet. This prevents transitions from having a starting value/initial state. Setting an element to display: none; makes the document render as if the element isn't there at all.
He suggest reflowing because it's generally accepted to hide and show elements with display: none; and display: block; - typically after the element has been requested by an action (tab or button click, callback function, timeout function, etc.). Transitions are a huge bonus to UX, so reflowing is a relatively simple way to allow these transitions to occur. It doesn't have an enormous impact when you use simple transitions on simple sites, so for general purposes you can trigger a reflow, even if technically you shouldn't. Think of the guy's example like using unminified JavaScript files in a production site. Can you? Sure! Should you? Probably not, but for most cases, it won't make a hugely noticeable difference.
There are different options available that prevent reflowing, or are generally easier to use than the method in the link you provided. Take the following snippet for a few examples:
A: This element is set to height: 0; and overflow: hidden;. When shown, it's set to height: auto;. We apply the animation to only the opacity. This gives us a similar effect, but we can transition it without a reflow because it's already rendered in the document and gives the transitions initial values to work with.
B: This element is the same as A, but sets the height to a defined size.
A and B work well enough for fading in elements, but because we set the height from auto/100px to 0 instantly, they appear to collapse on "fade out"
C: This element is hidden and we attempt to transition the child. You can see that this doesn't work either and requires a reflow to be triggered.
D: This element is hidden and we animate the child. Since the animation keyframes give a defined starting and ending value, this works much better. However note that the black box snaps into view because it's still attached to the parent.
E: This works similarly to D but we run everything off the child, which doesn't solve our "black box" issue we had with D.
F: This is probably the best of both worlds solution. We move the styling off the parent onto the child. We can trigger the animation off of the parent, and we can control the display property of the child and animate the transition as we want. The downside to this being you need use animation keyframes instead of transitions.
G: While I don't know if this triggers a reflow inside the function as I haven't parsed it myself, you can just simply use jQuery's .fadeToggle() function to accomplish all of this with a single line of JavaScript, and is used so often (or similar JS/jQuery fadeIn/fadeOut methods) that the subject of reflowing doesn't come up all that often.
Examples:
Here's a CodePen: https://codepen.io/xhynk/pen/gerPKq
Here's a Snippet:
jQuery(document).ready(function($){
$('button:not(#g)').click(function(){
$(this).next('div').toggleClass('show');
});
$('#g').click(function(){
$(this).next('div').stop().fadeToggle(2000);
});
});
* { box-sizing: border-box; }
button {
text-align: center;
width: 400px;
}
div {
margin-top: 20px;
background: #000;
color: #fff;
}
.a,
.b {
overflow: hidden;
height: 0;
opacity: 0;
transition: opacity 3s;
}
.a.show {
height: auto;
opacity: 1;
}
.b.show {
height: 100px;
opacity: 1;
}
.c,
.d {
display: none;
}
.c.show,
.d.show {
display: block;
}
.c div {
opacity: 0;
transition: 3s all;
}
.c.show div {
opacity: 1;
}
.d div {
opacity: 0;
}
.d.show div {
animation: fade 3s;
}
#keyframes fade {
from { opacity: 0; }
to { opacity: 1; }
}
.e div {
display: none;
}
.e.show div {
display: block;
animation: fade 3s;
}
.f {
background: transparent;
}
.f div {
background: #000;
display: none;
}
.f.show div {
display: block;
animation: fade 3s;
}
.g {
display: none;
}
<button id="a">A: Box Height: Auto</button>
<div class="a">This<br/>Has<br/>Some Strange<br/><br/>Content<br>But<br>That doesn't really<br>Matter<br/>Because shown,<br/>I'll be<br/>AUTO</div>
<button id="b">B: Box Height: 100px</button>
<div class="b">Content For 2</div>
<button id="c">C: Hidden - Child Transitions (bad)</button>
<div class="c"><div>Content<br/>For<br/>3<br/></div></div>
<div style="clear: both;"></div>
<button id="d">D: Hidden - Child Animates (Better)</button>
<div class="d"><div>Content<br/>For<br/>4<br/></div></div>
<div style="clear: both;"></div>
<button id="e">E: Hidden - Child Hidden & Animates</button>
<div class="e"><div>Content<br/>For<br/>5<br/></div></div>
<button id="f">F: Child Has BG & Animates (Works)</button>
<div class="f"><div>Content<br/>For<br/>5<br/></div></div>
<div style="clear: both;"></div>
<button id="g">G: This uses fadeToggle to avoid this</button>
<div class="g">I animate with<br/>JavaScript</div>
<footer>I'm just the footer to show the bottom of the document.</footer>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
I really don't know why this doesn't work: fiddle
When I click on the red box, I want it to move down 50px and change the height to 200px.
Any Idea?
Well this is how CSS work sadly, IDs take higher priority as a selector than a class would read this article for more info.
On click i added a class with the size/marign changes you wanted.
.box {
background-color: red;
height: 100px;
margin-top: 0px;
width: 100px;
display: block;
transition: all .5s ease-in-out;
}
.box-active {
height: 200px;
margin-top: 50px;
}
The JS
$('.box').click(function(){
$(this).addClass("box-active");
});
Here's a fiddle with the working solution.
Fiddle
You could use this instead:
jsFiddle example
$('#box').click(function(){
$(this).css('margin-top','50px');
$(this).css('height','200px');
});
I also added in the -webkit-/-moz- vendors/prefixes.
function changeprop(id)
{
$(id).css({'margin-top', '50px'});
$(id).css({'height', '200px'});
}
SyntaxError: missing : after property id
$(id).css({'margin-top', '50px'});
use : between property name and value not ,
function changeprop(id)
{
$(id).css({'margin-top': '50px'});
$(id).css({'height': '200px'});
}
this will work fine
maybe you can write your code in local html file and watch the console message throw firebug or other develop tool
thus can suffer less from error
Is there a way to change how fast the tooltip from an element's "title" attribute? I'd like it if the tooltip appeared immediately, but it seems to take a few seconds to appear.
No, there's no way. The title attribute is implemented in a browser dependent fashion. For example I remember differences between IE and FF when using \r\n inside it.
Mozilla's docs explain the limits and functionality well.
If you want customization you may take a look at third party plugins such as qTip2 which mimic it using divs and stuff and provide you full control.
You could use jqueryUI as suggested. An example of controlling the duration on the show property:
$( ".selector" ).tooltip({ show: { effect: "blind", duration: 800 } });
Jquery UI tooltip is extremely simple and customizable: Just download or include jquery UI in your page.
If you want all the tooltips of your page to show immediately at hover, just use this:
$(document).tooltip({show: null});
Note that this applies to all elements that have a 'title' attribute.
You can modify the selector to affect only a class, and set custom speed or effect:
$('.yourClass').tooltip({show: {effect:"none", delay:0}});
Unfortunately, there is no way to do this yet,
so I am using the following methods to help. (No dependencies required)
<style>
[title] {
position: relative;
}
[title]:after {
content: attr(title);
position: absolute;
left: 50%;
bottom: 100%; /* put it on the top */
background-color: yellow;
width: max-content;
opacity: 0;
-webkit-transition: opacity 0.75s ease-in-out; /* 👈 Change the time to meet your requirements. */
}
[title]:hover:after {
opacity: 1;
}
</style>
<div style="min-height:5rem"></div>
<div style="min-width: 5rem; border: 2px solid red;" title="hello world">my div</div>
<button title="for debug">button</button>
If you don't want the title to conflict with it, you can use data-* w3school.data-* help you, for example.
<style>
[data-tooltip] {
position: relative;
}
[data-tooltip]:after {
content: attr(data-tooltip);
position: absolute;
left: 50%;
bottom: 100%; /* put it on the top */
background-color: yellow;
width: max-content;
opacity: 0;
-webkit-transition: opacity 0.75s ease-in-out;
}
[data-tooltip]:hover:after {
opacity: 1;
}
div[data-tooltip]:after {
left: 5px!important;
}
</style>
<div style="min-height:5rem"></div>
<div style="min-width: 5rem; border: 2px solid red;" data-tooltip="hello world">my div</div>
<button data-tooltip="for debug">button</button>
<button title="for debug">title only</button>
<button data-tooltip="my tool tip msg" title="my title msg">title and tooltip</button>
below link may help you too.
fade in and out on simple css tooltip
It isn't possible to change how fast default browser's tooltip appear, but you can use one of the tooltip plugins (here is few: http://www.1stwebdesigner.com/css/stylish-jquery-tooltip-plugins-webdesign/ ) where you can customise lot's of things, including delay.
TippyJS has a billion customization options.
https://atomiks.github.io/tippyjs
https://github.com/atomiks/tippyjs
I have a div which currently has a static background image.
I need to create a slideshow of background images for this div.
I am able to achieve this by just setting a timeout and then changing the background image in the CSS but this is not very elegant.
I would ideally like to fade the background images out and in, but the div contains other page elements so I can not alter the opacity in any way.
Does anyone know of a good way to do this using jquery??
Here's some code which fades out/in but fades out the contents of the div too.
$("#slideshow").fadeOut(5000, function(){
$("#slideshow").css('background-image','url(myImage.jpg)');
$("#slideshow").fadeIn(5000);
});
HTML:
<div class="slideshow"></div>
CSS:
.slideshow
{
position: relative;
width: 350px;
height: 150px;
}
.slideshow img
{
position: absolute;
width: 350px;
height: 150px;
z-index:-1;
}
jQuery
var images=new Array('http://placehold.it/250x150','http://placehold.it/250x150/123456','http://placehold.it/250x150/dbca98');
var nextimage=0;
doSlideshow();
function doSlideshow()
{
if($('.slideshowimage').length!=0)
{
$('.slideshowimage').fadeOut(500,function(){slideshowFadeIn();$(this).remove()});
}
else
{
slideshowFadeIn();
}
}
function slideshowFadeIn()
{
$('.slideshow').prepend($('<img class="slideshowimage" src="'+images[nextimage++]+'" style="display:none">').fadeIn(500,function(){setTimeout(doSlideshow,1000);}));
if(nextimage>=images.length)
nextimage=0;
}
jsfiddle Demo
How about adding a thumbs pagination list, to update the background image on click, and then, a second or two, and it starts fading in and out with the next bg img automatically?
HTML:
<div class="slideshow">
<h1>Text</h1>
<input type="button" value="Hello" />
</div>
<ul>
<li><img src="http://placehold.it/50x50"></li>
<li><img src="http://placehold.it/50x50/123456"></li>
<li><img src="http://placehold.it/50x50/dbca98"></li>
</ul>
CSS:
.slideshow
{
position: relative;
width: 350px;
height: 150px;
}
.slideshow img
{
position: absolute;
width: 350px;
height: 150px;
z-index:-1;
}
ul {position: absolute; top: 125px; left: 75px;}
li {
float: left;
border: 1px solid #000;
margin: 15px;
}
Javascript:
var images=new Array('http://placehold.it/250x150','http://placehold.it/250x150/123456','http://placehold.it/250x150/dbca98');
var nextimage=0;
doSlideshow();
function doSlideshow()
{
if($('.slideshowimage').length!=0)
{
$('.slideshowimage').fadeOut(500,function(){slideshowFadeIn();$(this).remove()});
}
else
{
slideshowFadeIn();
}
}
function slideshowFadeIn()
{
$('.slideshow').prepend($('<img class="slideshowimage" src="'+images[nextimage++]+'" style="display:none">').fadeIn(500,function(){setTimeout(doSlideshow,1000);}));
if(nextimage>=images.length)
nextimage=0;
}
See it all together at http://jsfiddle.net/tatygrassini/R4ZHX/75/.
Instead of just changing the background image, you could first call
fadeOut()
then change source, and then call
fadeIn()
something like...
$('#image').fadeOut(500, function() {
$(this).attr('src', 'new-image.png')
.load(function() {
$(this).fadeIn();
});
});
To use a variety of images, there are a number of solutions, but you could simply iterate through a list of them.
You can create an positioned absolutely and with a slider plugin change the images contained in the div. Otherwize you have to sprite the background. I achieved this with the Jquery Tools tabs plugin.
$(".slidetabs").tabs(".images > div", {
// enable "cross-fading" effect
effect: 'fade',
fadeOutSpeed: "slow",
// start from the beginning after the last tab
rotate: true
// use the slideshow plugin. It accepts its own configuration
}).slideshow();
Here is a solution that not only addresses your problem, but will also solve some other problems as well. Create another DIV on your DOM as an overlay, and execute your fade functions on this DIV only. It will appear as though the content is fading in / out. This approach is also more performant, as you are only fading a single DIV instead of multiple elements. Here is an example:
$('#containeroverlay').width($('#container').width()).height($('#container').height()).fadeIn('normal', function() {
// Step 1: change your content underneath the hidden div
// Step 2: hide the overlay
$('#containeroverlay').fadeOut('normal');
})
Most importantly, this approach will work in IE6-8 without screwing up the font aliasing of elements you may have on the div.