I'm changing my background-image css property using Mootools:
$(document.body).setStyle('background-image','url(' + pBackground + ')');
And it's its working, but how can a make one fade effect between picture change?
Thanks,
Pedro
You can't fade a background specifically... you have to fade the element that has the background.
For your situation, I would suggest using a <div> that encompasses everything in the <body> of your HTML, ie:
<html>
<body>
<div id="main">
</div>
</body>
You could then set the background-image property of the #main div, and do something like this:
function backgroundChange(pBackground)
{
var m = $('main');
var fx = new Fx.Tween(m,{
duration: 1500,
onComplete: function(){
m.setStyle('background-image','url(' + pBackground + ')');
m.fade('in');
}
});
fx.start('opacity',1,0);
}
Just as a caution, any child elements of that div will also fade, so if you want the background to fade while elements over it remain opaque, you will need to absolutely position any child elements.
Absolutely positioning all elements brings other problems with it when you have variable length content, but there are ways around that too.
Not sure of what i am saying, BUT since it's not a part of the html document, it's not an 'element' so javascript should not be able to work on it.
But, just an idea, and depending on how your site looks, you could try to set an opacity, to simulate an opacity on the body, which can lead to the effect you want..
Related
I'd like to check if an image width has more than 400px I'd like this image to get full div width. if image is less than 400px just print it in its normal size.
any ideas how to do this?
<div id="volta">
<img src="/img/volta.jpg">
</div>
#volta{
width:500px;
}
As far as I know, this does not exist in CSS. What you should do instead is use classes.
Define some CSS class that applies the styles you want:
.long_width {
background: blue;
}
Then you would use Javascript to check the width of the image. You don't need jQuery to do this you can do it in vanilla Javascript (unless you already have jQuery imported and need it for other things). Maybe something like this:
let elm = document.querySelector('[src="/img/volta.jpg]"');
let width = window.getComputedStyle(elm).getPropertyValue('width');
And then you would use Javascript to add and remove styles accordingly:
if (width > 400) {
elm.classList.add("long_width");
}
else {
elm.classList.remove("long_width");
}
The specific answer to your question depends on what your intentions are. But to keep your code simple, you should use Javascript to handle the logic and not depend on CSS selectors for things this complicated. Instead, create a CSS class that contains the styles you need, and then use Javascript to apply it based on the size of the user uploaded image.
Additionally, if the user uploads the image, you should load it into memory and check its attributes in memory rather than by depending on a DOM element. Something like:
let img = new Image();
img.src = "{data URL of img}"
You will need javascript / jQuery to work. Something like this:
$('img').each(function(){
if($(this).width() > 400){
$(this).css('width', '100%');
}
});
Here is also working jquery example.
Apply an id to the image, and with jquery check its width
If it is greather than 400px modify his width or add a class that does the same.
Example
$(document).ready(function(){
if($("#image").width() > 400){
$("#image").css("width", "100%");
}
else{
$("#image").css("width", "10px");
}
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img id = "image" src = "https://pm1.narvii.com/6919/98f453834b5d87a6c92118da9c24fe98e1784f6ar1-637-358v2_hq.jpg"/>
You can do it like FlokiTheFisherman (with %), or you can use "wv" instead of "%".
I recommend using vw.
img[width='400'] {
width: 100%;
}
Basically:
div:hover
{
body{ background-image:(bg.png); }
}
This is logical code, I know it does not work, but its the best how I can show you my problem.
Well what your trying to accomplish cannot be achieved that way using Css only, You can do it using jquery like this
$("#someDiv").hover(function(){
$("body").css("background-image", "url('image_url')")
});
In css ,You can not do this as "body" is parent element to "div" and it should come next to the element hovered to use the for format like
firstelement:hover second_element {/*styles*/}
you can use jquery to achieve it
$("div").hover(function(){
$("body").css("background", "url('url_of_image_here')")
});
or javascript
elem = document.getElementById("ID");
elem.addEventListener("mouseout", function(){
document.getElementsByTagName("body")[0].style.backgroundImage="url()";
});
How do I achieve something like this:
*:hover{
background-color:lightblue;
}
I am trying to change background color of any element on the page when hovering on the element. Not sure why it doesnt work.
It works fine http://jsfiddle.net/mendesjuan/9pta8vbz/
The problem is that it's highlighting the entire body since the mouse is over the body, so you don't see highlighting on children any differently.
The following example should clarify it http://jsfiddle.net/mendesjuan/9pta8vbz/1/ It will highlight items inside the body
CSS
body *:hover{
background-color:lightblue;
}
HTML
<p>1 <span>inside</span></p><p>2</p><p>3</p>
It will highlight the paragraphs, but the span will behave the same way since the paragraph will also be highlighted
What you are doing cannot be done with CSS alone, you can use JS to add a CSS class to the element that the mouse is over http://jsfiddle.net/mendesjuan/9pta8vbz/2/
CSS
.highlight {
background-color:lightblue;
}
JavaScript
// This is a simplified version that doesn't take care of edge cases
// known bugs: should use addEventListener, should not wipe out existing `className`,
// e.target is not 100% cross browser, but those are other topics
document.onmouseover = function(e) {
e.target.className = 'highlight';
}
document.onmouseout = function(e) {
e.target.className = '';
}
I have div box which contains two items. One is under the other one. So when the lower item is hover I'd make it animated and slide it out of the top item.
<div id="main">
<div id="box"></div>
<div id="item"></div>
</div>
With my knowledge in CSS3 I could only make a transition for item to slide it out in hover. But I want it happen when #main is hover not #item.
Have a look at the them please.
http://jsfiddle.net/sL3Pw/
You are correct, there is no way currently to style a parent element of a child in pure CSS. You can use JavaScript as a way to achieve the desired effect.
(UPDATE)
You can achieve this in JavaScript by doing the following (DEMO: Fiddle)
JS
This should run onload or else it will not work.
// On Hover
document.getElementById('main').onmouseover = function () {
document.getElementById('item').classList.add("to-left"); // Add To Left Class
}
// OnMouseOut (Not Hover)
document.getElementById('main').onmouseout = function () {
document.getElementById('item').classList.remove("to-left"); // Remove To Left Class
}
Please remember to change the IDs of the elements if needed.
CSS
Add this CSS class to your CSS
.to-left {
margin-left: 60px;
}
And your HTML stays the same. This should get what I believe your desired result is. Let me know if this works for you.
My CSS has to change using a transition ,and till now i used div:hover for that.
The transition needs to be activated when you click another div, not when you hover over the div that has to move/change .
How can I do that ?
Thanks
Evert
You cannot handle click events on dom elements with css, you will need to use javascript for this.
You can add a click event to the first div which is fired when you click it. Within the event you select the other div, and make the transition.
Working Demo
You can do this by adding a class with the css transition:
Html:
<div id="clickme">1</div>
<div id="changeMe">2</div>
Javascript:
var el = document.getElementById('clickme');
el.onclick = function() {
document.getElementById('changeMe').className = "transition";
};
CSS:
.transition{
/* transition css */
}