I would like to create a div, so its subnodes can not override my default CSS class.
For example :
.content { color:red; }
<div class="content">
<p style="color:green">Hello</p>
<p style="color:blue">World !</p>
</div>
I would like the text color to be 'red'. The reason is that the content of the div comes from human inputs and I don't want them to modify font, color, size...
I think than "color:red!important;" doesn't work for subnodes.
I think than "color:red!important;" doesn't work of subnodes.
You could write a selector like .content, .content * { } … but then the submitted data could override it by using !important in the style attribute, so it wouldn't be an effective solution.
The only way to do this is to change the style attributes on the paragraphs. This is impossible to do from a stylesheet.
The quick and dirty option would be to use JavaScript to loop over all the elements and remove the styles.
The better approach, since you said:
the content of the div comes from human inputs and I don't want them to modify font, color, size
… would be to put some proper XSS protection in on your server that would sanitise the external input.
You should use a DOM aware white-listing parser (such as HTML Purifier if your server side code is written in PHP) for this.
Indeed you can use !important to override styles defined in sub-nodes, I have modified your .content class a little, run code snippet to see
.content * { color:red !important; }
<div class="content">
<p style="color:green">Hello</p>
<p style="color:blue">World !</p>
</div>
Related
Is there anyway i can access the style property for the particular div? For example, I have a code like below
<div class="testing" style="background-color:#ff00ff;">
This is my test Paragraph
</div>
I want to apply some other background color for this division. But i don't want to modify the class "testing", because it is being used in some other places also. Is there anyway using CSS only to access the style property and apply my new color?
I think attribute selectors may be what you are looking for:
div.testing[style="background-color:#ff00ff;"] {
background-color: new_color !important;
}
You can create another class and overwrite necessary property:
.testing-active {
background-color: red;
}
and use it like this:
<div class="testing testing-active"></div>
You need to make a style that has higher priority than the style. You could use the !important attribute to do that:
<div class="testing" style="background-color:#ff00ff;background-color:red !important;">
Big important caveat: whatever it is you're trying to do doesn't sound like a good idea, because the code will be very difficult to maintain. What is the underlying problem that you are trying to solve?
You can access the elements with this certain style like this:
.testing[style="background-color:#ff00ff;"] {
/* put your attributes here*/
}
but you cannot change the background-color attribute since this one has a higher priority in the html.
see this:
.testing[style="background-color:#ff00ff;"] {
background-color: #00f; /* not possible */
margin: 30px; /* possible */
}
what you can do is add a new attribute to your html like this:
<div class="testing" changecss="true">
This is my test Paragraph
</div>
and add this css:
.testing[changecss="true"] {
background-color: #00f;
}
See the JsFiddle as well.
"Think it is a dynamic code. How can i add new class without using javascript? "
The Answers is You cannot add a new class using CSS dynamically/ runtime. The only way to do it is by using javascript/jquery:-
HTML:
<div id="mydiv" class="testing" style="background-color:#ff00ff;">
This is my test Paragraph
</div>
JQUERY:
$('#mydiv').css('background','#ColorCode');
This way your class also wont change( since its being used in other places) and you can change the background also.
Can i ask why you are trying to achieve this using CSS?
I know this has been asked before here. But let me put my problem in a different way. I am using PHP and would like to show a HTML string coming from database in my page. But the problem is as the CSS of the page is of a generic style, it's taking the them in the HTML string also. But I want it to show without any styling whatsoever. I have gone through some searching the internet only to find about the "not" selector of CSS. I would like to know whether there is a way to identify a single element in my html page that would “not” take the general styling/css? What “not” does is specify all other element and “not” the one in the argument. I just want the opposite.
<style>
.div-class p{font-weight: bold;}
.div-class p:not(.no-style){font-weight: normal;}
</style>
<div class="div-class">
<p>This should be bold.</p>
<p class="no-style">This should not be bold.</p>
</div>
I would like the “p” with the “no-style” class to have a normal font weight. It’s currently the opposite. I hope to have made myself clear.
Thanks,
You may place your script output in div with certain id/class. And reset css to this div. There are a lot of various css resets available.
P.S. IMHO there is no css rule to disable all css for certain elements.
P.P.S. You may create an empty iframe (src="about:blank") and place your content there with javascript.
<style>
.div-class p
{
font-weight: bold;
}
.div-class p.no-style
{
font-weight: normal;
}
</style>
<div class="div-class">
<p>This should be bold.</p>
<p class="no-style">This should not be bold. </p>
</div>
Edit: see it working: http://jsfiddle.net/C3jqc/
Edit 2: you can't avoid heritage. You could use "not" in your CSS in this way:
<style>
p:not(.unstyled){
font-weight : bold;
}
</style>
<p> this should be Bold</p>
<p class='unstyled'> This shouldn't be bold</p>
Then add the "unstyled" class to every content you create from your PHP and the ":not(.styled)" to every CSS declaration.
Another option is to redefine every style in your CSS to match my original response.
Bear in mind the availability of the "not" selector across browsers.
there is a simple way to override the styles applied
you can use !important
for example
p{
font-weight:bold;
}
will not be applied if u have
.nostyle
{
font-weight:normal !important;
}
JSfiddle
I have the following HTML markup:
<h1>
<div class="sponsor">
<span>Hello</span>
</div>
World
</h1>
When I use the CSS selector h1 I get Hello World.
I can't unfortunately change the markup and I have to use only CSS selectors because I work with the system that aggregates RSS feeds.
Is there any CSS selector which I can take only the text node? Specifically the World in this example?
The current state of CSS can't do this, check this link: W3C
The problem here is that the content you write to the screen doesn't show up in the DOM :P.
Also ::outside doesn't seem to work yet (at least for me in Safari 6.0.3) or it simply doesn't generate the desired result yet.
Check my fiddle and then check the DOM source: JSfiddle
Finally there are attribute selectors a { content: attr(href);}, making CSS able to read DOM-node attributes. There doesn't seem to be a innerHTML equivalent of this yet. It would be great tho if that was possible, whereas you might be able to manipulate the inner markup of a tag.
Bit of a workaround:
h1 {
color: red;
}
h1 * {
color: lime;
}
<h1>
<div class="sponsor">
<span>Hello</span>
</div>
World
</h1>
This is almost the opposite of a question I asked last week: Is it possible to select the very first element within a container that's otherwise pure text without using classes or identifiers in pure CSS?
The short answer is no. "World" in this example isn't an element of its own - therefore there isn't a way to select it.
What you would have to do here is style the h1 then override that styling with div.sponsor. For instance, if you wanted "World" here to have a black background with white text you woud use something similar to:
h1 {
background:black;
color:white;
}
h1 div.sponsor {
background:white;
color:black;
}
Unfortunately, however, this wouldn't work if you were only wanting the word "World" styled and your markup had more than just that within <div>Hello</div> World Foo, for instance.
I don't believe it would be possible with pure CSS to style just "World" in this situation.
I also met same problem, where I can't touch the markup and have no control with js.
I needed to hide a text nodes in a div element, but the element to remain visible.
So here is my solution:
markup:
<div id="settings_signout_and_help">
<a id="ctl00_btnHelpDocs" class="ico icoHelp" href="http://" Help Guide</a>
Signed in as: <a id="ctl00_lUsr" href="Profile.aspx">some</a>
Home
Sign out
</div>
css:
#settings_signout_and_help {
font-size: 1px !important;
}
#settings_signout_and_help a {
font-size: 13px !important;
}
Hope this helps guys!
I had a similar problem where I had to remove the "World" text from html generated by a C# function.
I set the font-size to 0 on the 'h1' element and then applied my css to div class. Basically hiding the extra text, but keeping content in the div.
I don't know how to do it with just CSS, but...
Using JQuery, you could select all the elements inside except the stuff inside its child element
$("h1:not(h1 > div)").css()
and put whatever CSS effect you want inside there.
I'm dealing with a real hash of a site, so this is why I'm asking about this absurd question.
I've looked everywhere to find some sort of way to make a class override another class in the HTML class tag to no avail.
I can either do this, try to untie a ton of spaghetti (which I probably won't be allowed to do anyways), or something anyone else can recommend (would be greatly appreciated).
Is this possible?
class="myClass !important"
If not, is there some sort of equivalent?
Please help! Many thanks in advance!
No, that's not possible. You're going to have to iron out the CSS Specificity by yourself I'm afraid.
If you have the ability to change the HTML templates, you can always go in and add a <div id="override"> or something like that to the outer most wrapper of the page to use as the "master" rule in your CSS classes. Then, in the CSS, you can just add that ID before any of the existing classes or ones that you need to modify.
For instance, if you have the following and want to override the .some-class:
<div class="some-class">Bleh.</div>
And the corresponding CSS:
.some-class { color: red; }
You can wrap the whole thing with:
<div id="override">
<div class="some-class">Bleh.</div>
</div>
And add the #override (or whatever you want to name it) before the .some-class and this rule will take precedence over the other:
#override .some-class { color: green; } /* This will override the red color form the other rule */
.some-class { color: red; }
You can't use !important for entire selectors. You need to find the specific rules you want to override, and use !important on each.
You can add more than one class to a selector as follows:
class="myClass myClass2"
Above is what the class attribute would look like on your HTML element.
As far as the CSS goes, define the classes as follows:
.myClass {
color: black;
font-size: 14px;
}
The above is just a sample of some properties you may have.
Defining "myClass2" after "myClass" in your stylesheet will allow the properties from "myClass2" to overrided the matching ones in "myClass":
//This goes below myClass
.myClass2 {
font-size: 16px;
}
As long as "myClass2" is after "myClass", your font will take the size property of '16px;' The value of "myClass" will be overwritten by that of "myClass2". If "myClass2" comes before "myClass", you can use !important to ensure that style is taken over the one defined later:
//This goes above myClass
.myClass2 {
font-size: 16px !important;
}
Hope this helps.
CSS classes are just a group of styles so you can use class instead of inline style tag.
The !important keyword helps you to override a specific style and not working on classes.
So, for example:
Lets say that we have a css rule on every div somewhere in our CSS file
div{border:solid 1px #ff0000;}
And later on we have this rule:
div{background:#000000;}
Every div in our page will be with border and a background if we want to override the div css rules we need to do something like this:
div{background:none !important;border:none !important;/*...ADD YOUR CSS...*/}
you can create a css reset class to reset all the settings that you want and than add your css
Note, this is different than the older question How can I apply CSS on all buttons which are present in that page? because this is an already existing style. So given that a style, which we'll call "standard_label_style" already exists in an included CSS file, what can I do to say that all the labels on this page should have that style short of adding:
class="standard_label_style"
to each and every one? And yes, I know I could apply the styles ex-post-facto with a snippet of jQuery or JavaScript code. I'm just trying to learn how I'm supposed to do it with CSS.
Follow Up
I've gotten several comments that say just use syntax like this .standard_label_style, label... Unfortunately that does nothing like what I want. That would allow me to apply additional rules to the standard_label_style class, as well as rules to labels within this page, but would not allow me to apply that style to all the labels on this page. To see an example of this, here is a stylesheet and html to demonstrate. The label without a class will still not appear in red but that's what I'm hoping to have happen. I want to apply an existing class to all those labels on the page, not just the one with the class and without adding new styling on this page, the existing style should be the only style.
included.css:
.standard_label_style { color: red; }
test.html:
<html>
<head>
<link rel="stylesheet" type="text/css" href="included.css">
<style>
.standard_label_style, label { }
</style>
</head>
<body>
<label class="standard_label_style">Test Label</label><br/>
<label>Unclassed Test Label</label>
</body>
</html>
CSS doesn't really work like that.
You can apply a style to all labels directly:
label {
color: Lime;
}
or apply a class to all labels
.labelClass {
color: Lime;
}
<label class="labelClass"></label>
You can also have multiple selectors, so you could ammend your current style to be
.labelClass, label {
color: Lime;
}
What you can't do in standard CSS is something like
label {
.labelClass;
}
The good news is that there are a bunch of server side libraries which make CSS suck less and let you do exactly this kind of thing, see for example dotLess if you're using .NET which provides nested rules and a basic inheratance model.
To apply a style to every label on the page, use this CSS:
label {
/* styles... */
}
If you have an existing style (e.g. "standard_label_style") in the CSS already, you can apply that to every label:
.standard_label_style, label {
/* styles... */
}
This will affect every label through the site, so use with caution!
In your css file, can't you just put
.standard_label_style, label
{
//styles
}
.standard_label_style, label {
/* stuff */
}
I'm not sure you can... one possible workaround (feels a bit hackish though) is to attach the style to your body tag, then change the css to be this:
body.standard_label_style label{
//Your styles here
}
One of the most underused CSS tricks of all time: Give your bodies an id or class!
HTML:
<body id="standard_label_style">
<label>Hey!</label>
</body>
CSS:
#standard_label_style label{
the styles
}
will take the styles, while
HTML:
<body id="custom_label_style">
<label>Custom!</label>
</body>
Will not.
You are dealing here with CSS precedence. Declarations which are "more vague" (body tag, classes) are applied before declarations which are "less vague" (specific elements, inline CSS).
Thus your answer depends on how the stylesheet is defining label styles. If for example it says label {...}, then that's fairly specific, and your best bet is to use a more specific CSS style, see:
http://www.vanseodesign.com/css/css-specificity-inheritance-cascaade/ (good tutorial?)
CSS precedence
The level of "specificity" you need to override, as I said, depend on how specific your other stylesheet was. According to the link, "CSS embedded in the html always come after external stylesheets regardless of the order in the html".
There is also a chance that if you yourself define label {your custom css} that should work, if you import your stylesheet afterwards. It is what I would try first to see if it works. Have you tried this? What was the result?
Note that if you want to completely override the other stylesheet, you will need to also reset any CSS you are not using by settings its values to inherit or as appropriate.