When I hover over a div or class with an id of "a", can I get the background color of a div or class with the id of "b" to change?
This question is related to
css
Yes, you can do that, but only if #b is after #a in the HTML.
If #b comes immediately after #a: http://jsfiddle.net/u7tYE/
#a:hover + #b {
background: #ccc
}
<div id="a">Div A</div>
<div id="b">Div B</div>
That's using the adjacent sibling combinator (+).
If there are other elements between #a and #b, you can use this: http://jsfiddle.net/u7tYE/1/
#a:hover ~ #b {
background: #ccc
}
<div id="a">Div A</div>
<div>random other elements</div>
<div>random other elements</div>
<div>random other elements</div>
<div id="b">Div B</div>
That's using the general sibling combinator (~).
Both + and ~ work in all modern browsers and IE7+
If #b is a descendant of #a, you can simply use #a:hover #b.
ALTERNATIVE: You can use pure CSS to do this by positioning the second element before the first. The first div is first in markup, but positioned to the right or below the second. It will work as if it were a previous sibling.
A pure solution without jQuery:
function chbg(color) {
document.getElementById('b').style.backgroundColor = color;
}
<div id="a" onmouseover="chbg('red')" onmouseout="chbg('white')">This is element a</div>
<div id="b">This is element b</div>
JSFiddle: http://jsfiddle.net/YShs2/
This can not be done purely with css. This is a behaviour, which affects the styling of the page.
With jquery you can quickly implement the behavior from your question:
$(function() {
$('#a').hover(function() {
$('#b').css('background-color', 'yellow');
}, function() {
// on mouseout, reset the background colour
$('#b').css('background-color', '');
});
});
The following example is based on jQuery but it can be achieved using any JS tool kit or even plain old JS
$(document).ready(function(){
$("#a").mouseover(function(){
$("#b").css("background-color", "red");
});
});
Source: Stackoverflow.com