Can you use the word div to name a div class? or id?
for example:
#div.leftcol
or does it just get seen as
#leftcol
The browser will see that as <div id="div" class="leftcol"></div>
I don't follow what you mean, but I think what you're asking is can you use the word div to apply a class to div elements. If that's what you mean, then yes you can, and you do it exactly as you have shown in your question:
div.leftcol { color: red }
That style would be applied to all elements of type div with class leftcol. Without the div part, the style would apply to any element with class leftcol, regardless of what type of element it is:
.leftcol { color: red }
Edit now the question has been edited...
After the edit to your question, it makes a bit more sense (I think). Your first example would apply to an element with an id of div and a class of leftcol:
<div id="div" class="leftcol"></div>
The second example would apply to an element with an id of leftcol:
<div id="leftcol"></div>
Or if you are simply asking whether div is a some sort of reserved word in CSS, no, it's not, so feel free to use it as an identifier. However, that could get confusing (for example, you could end up with selectors like div.div #div)
can you provide an example?
you can use <div class="leftcol"> left content </div>
and then in your css .leftcol { background:red; }
you can address it either div.leftcol or just simple .leftcol
As in?
<div id="div.leftcol">Some content</div>
While it may work for HTML and Javascript it should cause a problem if you try to style it in a CSS stylesheet. As I am sure you know the following
div.leftcol {
color: #efefef;
}
means "Set the text color to #efefef for any div element that has leftcol as a class name" so it would not work. I have no idea if
div.div.leftcol {
color: #efefef;
}
would work but that is just ugly...
Related
This would be easier to explain with an example:
I have a div ID that is used many times on my page.
I would like to style only 1 of these div's differently, without changing its name.
Is there a way to style this 1 div, if it is inside another div?
For example, my page contains many of these:
<div id="text2">Some text</div>
And the one I wish to change is:
<div id="container">
<div id="text2">Some different styled text</div>
</div>
Is this possible?
PS. This is all with Wordpress, therefore they are dynamically generated. Adding individual inline CSS with style will not work. This MUST be done in my external CSS sheet.
In your case you could treat the inner div witin a div as a child and as a result you can use this css
#container #text2 {
/* Unique Div Style */
}
It is correct that if you have an element that is being repeated a lot,, you should use a class and not an id.
If you have a lot of
<div id="text2">Some text</div>
then it should really be like this
<div class="text2">Some text</div>
If you do that then your CSS could look like this for that ONE div that you want to style differently
#container .text2 {
/* Unique Div Style */
}
Of course, provided that your container ID is unique ID.
ALSO, if you changed your code and you styled repetitive elements with classes then you could apply multiple classes to the same element..
Like so:
<div class="text2 text2new">Some text</div>
Now you could write CSS for class .text2new
.text2new{
/* make sure your css code overrides the old class*/
}
If it is important to you to have the site display correctly in older browsers multiple classes are not supported btw.
Hope this makes it clearer.
Try:
#container #text2 {
/* YOUR CSS HERE */
}
As commented above, if you want to apply the same style to multiple elements, use class instead of id. Styles could be applied to specific elements following the specified structure, which means in your case, you should be using
#container .text2 {
// styles go here...
}
If however your text2 remains an id, the style would only be applied to the first element with that particular id found.
Currently tweaking a theme and have tried searching for an answer to this question to this! I'm not stuck - but more just want to know the answer out of curiosity.
I understand that
"#" means an id and
"." means a class.
I've also been reading on this post about how you can add specificity to your html/css through combination of elements/ids/classes ie:
a.fancy { color: red; } /*an element that has an anchor and a class = red.*/
However the code I am working on has the following elements that I don't understand:
div.footer {background-color: {{ settings.footer_color }};
Why would you specify "div.footer" as both the div and the class when simply using a "." would suffice? In my mind there would be no point when the class ".footer" could be used without a div?
Hope you can help me work this one out!
div.footer means the element must both BE a <div> and HAVE the class footer.
.footer would trigger for any element with class footer; for example, a <span class="footer".
div.footer means you are targeting only <div> elements with the class .footer.
<div class="footer">This is targeted.</div>
<p class="footer">This isn't targeted, as it isn't a div with the class .footer.</p>
div .footer, however, would target all elements with the class .footer that are descendants from <div> elements.
<div><p class="footer">This is targeted.</p></div>
<section><p class="footer">But this isn't targeted.</p></section>
With the new implementation of html5 <footer> is a legitimate tag just like <div> or <p>. As confusing as it may be the period . before the footer declaration constrains it to a class name instead of the tag.
So in your case: div.footer = <div> with class name footer = <div class="footer>.
There are numerous reasons why you may make such a declaration.
Sample html
<div>
<div class="footer">Footer only</footer>
<div>Div only</div>
<footer>Footer tag; DIFFERENT</footer>
</div>
Example Css
div {
border: 1px solid red;
}
.footer {
background: blue;
color: #fff; /* white font color */
}
Depending on what you want to do, let's use the specific div.footer examples to show what we can do.back
Inheritance
By inheritance, div.footer will inherit "3 properties" -> background, color and border from the div and .footer declarations.
Now you may want to override some of these properties so...
Overriding Property
Use something like div.footer { color: red; } this will override the white color.
Layout Insight
The beauty of css is that you can use declaration to give you "insight" on what the html markup will be laid out as.
Omitting properties I would write the css as follows:
#footer {}
#footer ul {}
#footer ul li {}
#footer p {}
#footer p a {}
The html:
<div id="footer">
<ul>
<li>List 1</li>
<li>LIst 2</li>
</ul>
<p>Hello! Copyright website company name.</p>
</div>
You could then reverse engineer the html through just css because of the descendent character use. This maximizes the power of "cascading".
--
NOow I hope some of this has given you some insight. A few other pointers are this:
Typically a webpage has only one footer. When there is only one of something use the # id selector ALWAYS.
Use classes to not only apply styles to multiple elements but to also provide "meaning to your markup" -> go back to the principle of "layout insight" to understand what I mean.
div.footer should could more simply be .footer Now, it may be necessary to include div just to say "I only want to apply this class to divs only" and in that case go for it. But defining all your declarations with div.someClasName is not all that valuable.
DO NOT use names of tags as classnames. div.div is very confusing - especially if you are programming for a while. Therefore, since <footer> is now a legit tag you shouldn't apply it as a classname. On the other hand "#footer" could be argued differently because it can only exist once in a webpage.
It's about specificity. div.footer is more specific (a div with that particular class) than .footer (any element with that class).
As to when to use one or the other, it really depends on the markup and CSS you are building.
I'm using jQuery to add a Class to a few elements.
I'm not new to adding classes, nor removing them. But I'm still somewhat intermediate with styles and any flexibility styles can perform to single elements.
Here's what's going on:
I have 2 Divs that I'm affecting with jQuery:
<div id="columnleft">stuff in here</div>
<div id="columncenter">bigger stuff in here</div>
In a nutshell, column left is about 155px wide, while columncenter is positioned relative to columnleft, with a margin-left of 162px
Here's my styles:
<style>
#columnleft {
float:left;
position:relative;
text-align:left;
width:155px;
}
#columncenter {
position:relative;
padding-bottom:50px
margin:0;
margin-left:162px;
}
</style>
I'm basically toggling these 2 divs with the jQuery examples below:
So far I've gotten these 2 separate instances to work:
$("#columnleft").hide();
$("#columncenter").css("margin","0px");
then........
$("#columnleft").show();
$("#columncenter").css("margin-left","162px");
Though this works, I'm not quite satisfied.
I'd prefer to create a class or two that I can use to toggle the hiding of columnleft, while also changing the margin-left at the same time.
It's all fine with the example above, when I'm only using jQuery. But there are times when a page loads, and the columnleft is meant to be hidden, and columncenter is meant to be expanded, from the beginning. Would be nice to not need jQuery to enter the scene at those moments.
All I could come up with is:
<style>
.disappear { display:none; }
.maximize { margin:0px; margin-left:0px; }
</style>
When the page loads:
<div id="columnleft" class="disappear">stuff in here</div>
<div id="columncenter" class="maximize">bigger stuff in here</div>
it seems that columncenter is ignored. (columnleft indeed does disappear)
Also, toggling with jquery, the same result occurs.
Column Center hates me!
Does anyone see where I'm missing the mark?
View JSFiddle: http://jsfiddle.net/tuanderful/bTZq8/
What if you had another div that contains both #columnleft and #columncenter, and has a class of .hide-left or .show-left:
<div class="hide-left">
<div id="columnleft">stuff in here</div>
<div id="columncenter">bigger stuff in here</div>
</div>
Then add the following CSS:
.show-left #columnleft {
display: block;
}
.show-left #columncenter {
margin-left: 162px;
}
.hide-left #columnleft {
display: none;
}
.hide-left #columncenter {
margin-left: 0;
}
You can update your jQuery to simply toggle the .hide-left or .show-left classes on the parent container.
What I did here is similar to adding .disappear and .maximize styling, but I added a bit of context around the two columns. The neat thing is that all of the styling is handled purely by CSS - when you want to show or hide your sidebar, you only need JavaScript to update the state of the container; that is, change the class in the container from hide to show or vice versa.
You need to put !important on the css styling.
.maximize {
margin-left: 0px !important;
}
That makes it so that it overrides any other styling of the same kind. Check it out here.
There is an order of importance in CSS. An id # is considered more important than a class . (there can only be one id and many classes after all). So if you are trying to override an id with a class, you need to use !important.
each type of selector in css is weighted differently id being higher than classes and classes being higher than objects
to fix your problem make the selector as such
#columncenter.maximize
this will overwrite the rule before it
don't use !important while it might work now it can be hard to find out why something is being overridden later on
This question already has answers here:
Closed 11 years ago.
Possible Duplicates:
How do I prevent CSS inheritance?
is there a way to exclude a tag from css class
I have CSS like this
.div1 img {
// ...
}
.myimg {
// ...
}
and my HTML code is like this,
<div class="div1">
...
<img src="..." class="myimg"> // image html
...
</div>
The css formatting defined in .div1 img is obviously applied to the image html code. However, I actually don't want it happen. What can I do to not to have '.div1 img' effects on that image html code? I don't want to modify the content of div1 img or related html code because it is used in other places already (and it is a template code that I don't want to mess with).
P.S. I cannot remove or modify <div class="div1"> either because there is other template code around.
Thanks.
You have two options:
You can explicitly override all of the styling defined in .div1 img with what they should be in .myimg
You can write .div1 img:not(.myimg) for the first rule.
You could do:
.div1 img:not(.myimg) {
// ...
}
:not selector explained here
There is a nice little not selector that would work, but unfortunately it doesn't work in all browsers.
One sure way to do that is redefine all your .div1 styles in your child .mying class so it overrides the parent.
here is a little demo in jsfiddle: http://jsfiddle.net/u6MnN/1/
mess around with it and see what's best for you.
you need to neutralize all those stylings you are giving to ".div1 img" for example if you say "width:100px" there you need to say "width:auto" in the other one.
Although if you have lots of rules in the first set it would be very dirty this way and you need to change your layout.
If you have img tags inside a container div with class .div1 they will of course get the styling you define in .div1 img, but if you want lets say 2 images out of 8 in that div to have another style (which i believe is why you made class .myimg), you need to put !important after the defined stylings in .myimg like so:
.div1 img
{
height: 125px;
width: 125px;
}
.myimg
{
height: 150px !important;
width: 150px !important;
}
This is only if you are NOT using CSS 3.0
I have something like:
<div id="content>
<h1>Welcome to Motor City Deli!</h1>
<div style=" font-size: 1.2em; font-weight: bolder;">Sep 19, 2010</div>
<div > ... </div>
What is the css selector for the second div (1st div within the "content" div) such that I can set the font color of the date within that div?
The MOST CORRECT answer to your question is...
#content > div:first-of-type { /* css */ }
This will apply the CSS to the first div that is a direct child of #content (which may or may not be the first child element of #content)
Another option:
#content > div:nth-of-type(1) { /* css */ }
You want
#content div:first-child {
/*css*/
}
If we can assume that the H1 is always going to be there, then
div h1+div {...}
but don't be afraid to specify the id of the content div:
#content h1+div {...}
That's about as good as you can get cross-browser right now without resorting to a JavaScript library like jQuery. Using h1+div ensures that only the first div after the H1 gets the style. There are alternatives, but they rely on CSS3 selectors, and thus won't work on most IE installs.
The closest thing to what you're looking for is the :first-child pseudoclass; unfortunately this will not work in your case because you have an <h1> before the <div>s. What I would suggest is that you either add a class to the <div>, like <div class="first"> and then style it that way, or use jQuery if you really can't add a class:
$('#content > div.first')