Does someone know how to use the CSS selector :not() as #some_id:not(.any_class_name)?
The code looks as if it is right, but it doesn't work. Is there another way without the not selector? I couldn't find anything on the Internet.
I am making a web application, which includes more than one page, but several pages have divs with id=some_id. I thought I had to add specific CSS by adding any_class_name one time using the above CSS code solve the problem, but it doesn't work.
I believe that you are reversing the selectors. You have some elements with the same class, but you want to filter out an element with an specific ID. In that case:
HTML:
<p class="someclass">hello</p> <!-- will be targeted by css below, thus green -->
<p class="someclass" id="some-id">hi</p> <!-- will not be targeted by css below -->
CSS:
.someclass:not(#some-id){ color: green; }
/* selects all elements with classname 'someclass',
but excludes the one that has also has an id of 'some-id' */
And as #secretSquirrel pointed out, note the browser compatibility: this selector is not supported by Internet Explorer 8 and older.
This will set all the backgrounds except the ones that has <a></a>:
:not(a)
{
background: gray;
}
I hope this will help you.
Demo
Another way is:
You can override the css. May be you want something like this.
<div id="demo">
<p class="class">This is a paragraph.</p>
<p>This is another paragraph.</p>
</div>
Your css
#demo
{
color:#0000ff;
}
.class
{
color:#ff0000;
}
Related
I just wanted to know when is neccessary for me to place a div.cssclass when using two css classes together in my stylesheet. I normally troubleshoot by using with and without it until it works which obviously is fine and quick enough but I would be good to know the best practice.
Example:
.cssclass1 .cssclass2 { }
VS
.cssclass1 div.cssclass2 { }
Is it when its not a direct sibling to it, i.e the next class nested in there?
If both those elements are divs, then there is no difference, except that
.cssclass1 .cssclass2 {
is faster than
.cssclass1 div.cssclass2 {
If you'd have let's say:
<div class="cssclass1">
<div class="cssclass2"></div>
<a class="cssclass2"></a>
</div>
then .cssclass1 .cssclass2 { would select both div and a, while .cssclass1 div.cssclass2 { would select only the div.
The difference is Specificity because if you have .cssclass1 .cssclass2, all elements with that classes are affected BUT if you use .cssclass1 div.cssclass2, the only affected is the <div> element with the cssclass2 class.
As Jonjie said, it's about specificity. Here's an example...
div .cssclass2 {
background-color: green;
}
.cssclass1 div {
background-color: blue;
}
div div {
background-color: orange;
}
<div class="cssclass1">
<div class="cssclass2">
hello
</div>
</div>
As you can see, none of the styling declarations are an exact match for our html here. So, what colour should the background be? CSS has a way to resolve this ambiguity by identifying the css that is most specific to the html. There are some good blog posts about understanding CSS specificity.
<div class="wrapper">
<!--
Several random elements that I'm not able to predict.
div, p, h3, etc.
-->
<div class="foo">...</div>
<!--
Could have only 1 .foo, 2 .foo, or 3, 4, 5 .foo...
-->
<div class="foo">...</div>
<!--
Also several random elements
-->
</div>
HTML code is something like above. Now I know the reason why div.foo:first-of-type doesn't work. But is there any alternative solution?
How can I select the first .foo? How can I select the last .foo? Of course via pure css...
Thanks!
How can I select the first .foo?
The technique described here: CSS selector for first element with class:
div.foo {
/* Style all */
}
div.foo ~ div.foo {
/* Revert styles for all but the first */
}
How can I select the last .foo?
The technique described above relies on sibling selectors and overrides. The biggest limitation of sibling selectors is that they only work in one direction, and since they work for the first element by overriding for all elements after the first, they won't work for the last because you can't select siblings that come before some other element using sibling selectors.
There is no pure CSS alternative.
Any HTML5 browser will let you use nth-of-type as it is intended...
I am not saying this is a recomended technique, I am just showing how this option works ...
I don't know if you will like it or not, but AFAIK is the only way to get what you want for the last one (as BoltClock says)
foo:first-of-type {
background-color: lightgreen;
}
foo:last-of-type {
background-color: lightblue;
}
<div>
<div>div</div>
<foo>foo</foo>
<div>div</div>
<foo>foo</foo>
<div>div</div>
<foo>foo</foo>
</div>
you can use first-child, and last-child
html
<div class="wrapper">
<p>1</p>
<p>2</p>
<p>3</p>
</div>
css
p:first-child {
color: red;
}
p:last-child {
color: green;
}
Here's a JsFiddle Example
Beware that last-child is only supported since IE 9, and first-child is supported from IE 7
How can I set the style of only the first div that has class "bla"? (not the second).
<div class="outer">
<div>
....(more div's, unknown how many)
<div class="bla">
....
<div class="bla">some content</div>
</div>
....
</div>
</div>
I'm assuming with this answer that by adjacent elements you mean sibling elements. If you were referring to parent-child elements then go with N1xx1's answer. That being said...
You can't target the first bla with css selectors alone. But you can target all the blas but the first. So, one possibility is to set the styles you want only on the first bla on all blas. Then override those styles by targeting all blas but the first. Like so:
.bla {
...styles for the first bla..
}
.bla ~ .bla {
...override styles set on first bla that you dont want on the others
}
The tilde between the two ".bla"'s is called the general sibling selector. If you've never heard of it, head on over to css selectors spec.
You can do simple workaround for this since you can't do that with any special selector:
.bla {
/* style here, example: */
background-color: #f00;
}
.bla .bla {
/* negate the style, example: */
background-color: transparent;
}
I hope this is what you were looking for.
According to pure css, you can't select according to the ordering of the html elements. Search the spec (here: http://www.w3.org/TR/CSS2/selector.html). There is nothing that refers to how many or in what order html elements match the given selectors.
Javascript:
getElementsByClass('bla')[0].style
EDIT: JOPLOmacedo provided a CSS only (better) answer
I've also found a way to select for instance the second <p> after a <h1> tag:
h1 + p + p{
background: red;
}
Just thought I'd share that.
I have this CSS on my page.
img {
opacity:0.4;
filter:alpha(opacity=40);
}
img:hover {
opacity:1;
filter:alpha(opacity=100);
}
I want to have a few images that aren't affected by this opacity. How would I go about accomplishing this?
The best way to do it would be to give it a unique ID and target it separately:
img#theID {
// CSS for that particular image here
}
Method 1
The most popular method to accomplish something like this suggests the usage of specificity. Basically, the more specific the selector is, the higher precedence. Consider this markup
<section>
<div class="container">
<img src="blahblah.jpg" />
<div class="wrap">
<img src="blahblahblah.jpg">
</div>
</div>
<section>
<img>
<img>
If you use
img {
/* Styles */
}
Those styles will be applied to all. But if you used something like this
section .container .wrap img {
/* Different Styles */
}
Those styles will take precedence for that image, because CSS likes the most specific answer you can give.
Method 2
In addition to this answer given by user125697, which suggests using id's as such
/* img#ID - ID can be whatever you want*/
img#hover {
opacity:1;
filter:alpha(opacity=100);
}
And you would impliment it as such
<img id="hover" src="blahblah.jpg" />
Chris Coyier has published a pen about this. To test the results, just remove one of the classes from the box, and you will see that it changes colors. So basically classes are always overridden by IDs
Method 3
Not Encouraged
The final method I know of is to use !important, which overrides every style on the page. No matter what. This is highly disapproved of, because it can create a lot of problems down the road.
Is there some kind of "not" CSS selector?
For example when I write the following line in my CSS, all input fields inside an tag with class classname will have a red background.
.classname input {
background: red;
}
How do I select all input fields that are OUTSIDE of a tag with class classname?
With current browser CSS support, you can't.
Newer browsers now support it- see Sam's answer for more info.
(See other answers for the alternatives in CSS.)
If doing it in JavaScript/jQuery is acceptable, you can do:
$j(':not(.classname)>input').css({background:'red'});
Mozilla supports negation pseudo-class:
:not(.classname) input {background: red;}
See also: http://developer.mozilla.org/en/Mozilla_CSS_support_chart
Note that the negation pseudo class is in the Selectors Level 3 Recommendation and works in recent versions of Firefox, Chrome and Safari (at least). Sample code below.
<html>
<head>
<title>Negation pseudo class</title>
<style type="text/css">
div {
border: 1px solid green;
height: 10px;
}
div:not(#foo) {
border: 1px solid red;
}
</style>
</head>
<body>
<div id="foo"></div>
<div id="bar"></div>
<div id="foobar"></div>
</body>
</html>
Wouldn't you do that by setting the 'global' background to red, then using the classname to alter the others?
input { background: red; }
.classname input { background: white; }
I would do this
input { /* styles outside of .classname */ }
.classname input { /* styles inside of .classname, overriding above */ }
There is no way to select the parent of matched elements with CSS. You would have to use JavaScript to select them.
From your question I assume you have markup that looks more or less like this:
<form class="formclassname">
<div class="classname">
<input /> <!-- Your rule matches this -->
<input /> <!-- Your rule matches this -->
</div>
<input /> <!-- You want to select this? -->
<input /> <!-- You want to select this? -->
</form>
One option is to add a class to a higher element, say the <form>, and write a rule to style all of the inputs of the form. I.E:
.formclassname input {
/* Some properties here... */
}
Or
.formclassname > input {
/* Some properties here... */
}
If you want to select them based on the fact that they are not inside of an element with a specific class, you're out of luck without the use of JavaScript.
I think the closest you can get is to only affect direct descendants with a declaration
This code for example will only affect input fields directly under divs with class "maincontent"
div.maincontent > input {
// do something
}
Inputs are a bit annoying because, unlike most other html elements, there isn't necessarily a way of resetting all the css properties back to their default value.
If the styling is non-critical (ie a nice to have but doesn't affect functionality) I would use jQuery to get an array of all the inputs, check their parents, and then only carry out the styling on those outside that div. Something like:
$('input').each(function() {
if($(this).closest('.classname') == false)
{
// apply css styles
}
});
(By the way, I'm no jQuery expert, so there might be some errors in the above, but in principle something like this should work)