This question already has answers here:
Assigning classes to elements through CSS
(3 answers)
Closed 8 years ago.
Is it possible to make all h3 elements be of the class responsive-heading through CSS. For a better idea of what I am trying to achieve please see the CSS code below:
h3 { .responsive-heading }
/* The class responsive-heading is implemented inside another CSS file and its contents are:
.responsive-heading { font-size: 30px; .... etc. }
*/
I am aware I could use Javascript and/or JQuery for assigning each h3 the class .responsive-heading but I before I start doing that I'd rather know if there is a css way?
In short: I want to apply .responsive-heading style to all h3. We hav hundreds of pages to update the H3 elements.
As stated, no you can't do that.
However, in your CSS, you can simply apply the same styles to H3s.
h3, .responsive-heading {...styles...}
No, you can't use css to change the class of an element.
If you could or would modify the external css,
you can change the selector to
h3, .responsive-heading {
...styles...
}
Or you can copy style rules of .responsive-heading to your h3 style, if you really sure ALL h3 should implement this.
Besides, I have to say hundreds of pages are not that many. If I was you, I will search h3 in my code and add the class to every one when I'm sure that one is one of whom need the class.
Related
I want to make class2 {display:none;} but only if class1 exists.
Basically I have an age-gate plugin which, when triggered/visible, is selectable via the "age-gate-form" class.
I want to have another class, "banner", be invisible when age gate is visible/triggered.
Is this doable without touching JS/jQuery?
How is it doable?
I tried to check other answers and google a bit but I'm not sure i've found anything to do exactly what I need.
EDIT:
2 classes are
.age-gate-wrapper < If this exists Then
.pum-container {display:none !important;}
I tried to
.age-gate-wrapper.pum-container {display:none !important;}
on the page where both classes existed but it didnt work, pum-container is still visible
The two classes are in different elements (age-gate comes first)
If you want to do this only with CSS and not touch any JS/Jquery, you can do it like this.
.class1.class2{ display:none; }
This will work only if one item has both of these two classes. You can check the example here
https://stackoverflow.com/a/5796669/9914401
Adding my comment as an answer (since it solved the issue).
Since these are two different elements, you can use the general sibling selector: ~ since both elements are in the <body> tag:
.age-gate-wrapper ~ .pum-container { display: none }
If you need to be more specific, or override default styles you can add the !important attribute to the property style:
.age-gate-wrapper ~ .pum-container { display: none !important}
or in your case:
.age-gate-wrapper ~ .pum { display: none !important}
This question already has answers here:
Selecting and manipulating CSS pseudo-elements such as ::before and ::after using javascript (or jQuery)
(26 answers)
How to update placeholder color using Javascript?
(5 answers)
Closed 2 years ago.
Is it possible to change a CSS pseudo-element style via JavaScript?
For example, I want to dynamically set the color of the scrollbar like so:
document.querySelector("#editor::-webkit-scrollbar-thumb:vertical").style.background = localStorage.getItem("Color");
and I also want to be able to tell the scrollbar to hide like so:
document.querySelector("#editor::-webkit-scrollbar").style.visibility = "hidden";
Both of these scripts, however, return:
Uncaught TypeError: Cannot read property 'style' of null
Is there some other way of going about this?
Cross-browser interoperability is not important, I just need it to work in webkit browsers.
If you're comfortable with some graceful degradation in older browsers you can use CSS Vars. Definitely the easiest of the methods I've seen here and elsewhere.
So in your CSS you can write:
#editor {
--scrollbar-background: #ccc;
}
#editor::-webkit-scrollbar-thumb:vertical {
/* Fallback */
background-color: #ccc;
/* Dynamic value */
background-color: var(--scrollbar-background);
}
Then in your JS you can manipulate that value on the #editor element:
document.getElementById("#editor").style.setProperty('--scrollbar-background', localStorage.getItem("Color"));
Lots of other examples of manipulating CSS vars with JS here: https://eager.io/blog/communicating-between-javascript-and-css-with-css-variables/
To edit an existing one which you don't have a direct reference to requires iterating all style sheets on the page and then iterating all rules in each and then string matching the selector.
Here's a reference to a method I posted for adding new CSS for pseudo-elements, the easy version where you're setting from js
Javascript set CSS :after styles
var addRule = (function (style) {
var sheet = document.head.appendChild(style).sheet;
return function (selector, css) {
var propText = typeof css === "string" ? css : Object.keys(css).map(function (p) {
return p + ":" + (p === "content" ? "'" + css[p] + "'" : css[p]);
}).join(";");
sheet.insertRule(selector + "{" + propText + "}", sheet.cssRules.length);
};
})(document.createElement("style"));
addRule("p:before", {
display: "block",
width: "100px",
height: "100px",
background: "red",
"border-radius": "50%",
content: "''"
});
sheet.insertRule returns the index of the new rule which you can use to get a reference to it for it which can be used later to edit it.
EDIT: There is technically a way of directly changing CSS pseudo-element styles via JavaScript, as this answer describes, but the method provided here is preferable.
The closest to changing the style of a pseudo-element in JavaScript is adding and removing classes, then using the pseudo-element with those classes. An example to hide the scrollbar:
CSS
.hidden-scrollbar::-webkit-scrollbar {
visibility: hidden;
}
JavaScript
document.getElementById("editor").classList.add('hidden-scrollbar');
To later remove the same class, you could use:
document.getElementById("editor").classList.remove('hidden-scrollbar');
I changed the background of the ::selection pseudo-element by using CSS custom properties doing the following:
/*CSS Part*/
:root {
--selection-background: #000000;
}
#editor::selection {
background: var(--selection-background);
}
//JavaScript Part
document.documentElement.style.setProperty("--selection-background", "#A4CDFF");
You can't apply styles to psuedo-elements in JavaScript.
You can, however, append a <style> tag to the head of your document (or have a placeholding <style id='mystyles'> and change its content), which adjusts the styles. (This would work better than loading in another stylesheet, because embedded <style> tags have higher precedence than <link>'d ones, making sure you don't get cascading problems.
Alternatively, you could use different class names and have them defined with different psuedo-element styles in the original stylesheet.
I posted a question similar to, but not completely like, this question.
I found a way to retrieve and change styles for pseudo elements and asked what people thought of the method.
My question is at Retrieving or changing css rules for pseudo elements
Basically, you can get a style via a statement such as:
document.styleSheets[0].cssRules[0].style.backgroundColor
And change one with:
document.styleSheets[0].cssRules[0].style.backgroundColor = newColor;
You, of course, have to change the stylesheet and cssRules index. Read my question and the comments it drew.
I've found this works for pseudo elements as well as "regular" element/styles.
An old question, but one I came across when try to dynamically change the colour of the content of an element's :before selector.
The simplest solution I can think of is to use CSS variables, a solution not applicable when the question was asked:
"#editor::-webkit-scrollbar-thumb:vertical {
background: --editorScrollbarClr
}
Change the value in JavaScript:
document.body.style.setProperty(
'--editorScrollbarClr',
localStorage.getItem("Color")
);
The same can be done for other properties.
Looks like querySelector won't work with pseudo-classes/pseudo-elements, at least not those. The only thing I can think of is to dynamically add a stylesheet (or change an existing one) to do what you need.
Lots of good examples here:
How do I load css rules dynamically in Webkit (Safari/Chrome)?
This question already has answers here:
Selecting and manipulating CSS pseudo-elements such as ::before and ::after using javascript (or jQuery)
(26 answers)
How to update placeholder color using Javascript?
(5 answers)
Closed 2 years ago.
Is it possible to change a CSS pseudo-element style via JavaScript?
For example, I want to dynamically set the color of the scrollbar like so:
document.querySelector("#editor::-webkit-scrollbar-thumb:vertical").style.background = localStorage.getItem("Color");
and I also want to be able to tell the scrollbar to hide like so:
document.querySelector("#editor::-webkit-scrollbar").style.visibility = "hidden";
Both of these scripts, however, return:
Uncaught TypeError: Cannot read property 'style' of null
Is there some other way of going about this?
Cross-browser interoperability is not important, I just need it to work in webkit browsers.
If you're comfortable with some graceful degradation in older browsers you can use CSS Vars. Definitely the easiest of the methods I've seen here and elsewhere.
So in your CSS you can write:
#editor {
--scrollbar-background: #ccc;
}
#editor::-webkit-scrollbar-thumb:vertical {
/* Fallback */
background-color: #ccc;
/* Dynamic value */
background-color: var(--scrollbar-background);
}
Then in your JS you can manipulate that value on the #editor element:
document.getElementById("#editor").style.setProperty('--scrollbar-background', localStorage.getItem("Color"));
Lots of other examples of manipulating CSS vars with JS here: https://eager.io/blog/communicating-between-javascript-and-css-with-css-variables/
To edit an existing one which you don't have a direct reference to requires iterating all style sheets on the page and then iterating all rules in each and then string matching the selector.
Here's a reference to a method I posted for adding new CSS for pseudo-elements, the easy version where you're setting from js
Javascript set CSS :after styles
var addRule = (function (style) {
var sheet = document.head.appendChild(style).sheet;
return function (selector, css) {
var propText = typeof css === "string" ? css : Object.keys(css).map(function (p) {
return p + ":" + (p === "content" ? "'" + css[p] + "'" : css[p]);
}).join(";");
sheet.insertRule(selector + "{" + propText + "}", sheet.cssRules.length);
};
})(document.createElement("style"));
addRule("p:before", {
display: "block",
width: "100px",
height: "100px",
background: "red",
"border-radius": "50%",
content: "''"
});
sheet.insertRule returns the index of the new rule which you can use to get a reference to it for it which can be used later to edit it.
EDIT: There is technically a way of directly changing CSS pseudo-element styles via JavaScript, as this answer describes, but the method provided here is preferable.
The closest to changing the style of a pseudo-element in JavaScript is adding and removing classes, then using the pseudo-element with those classes. An example to hide the scrollbar:
CSS
.hidden-scrollbar::-webkit-scrollbar {
visibility: hidden;
}
JavaScript
document.getElementById("editor").classList.add('hidden-scrollbar');
To later remove the same class, you could use:
document.getElementById("editor").classList.remove('hidden-scrollbar');
I changed the background of the ::selection pseudo-element by using CSS custom properties doing the following:
/*CSS Part*/
:root {
--selection-background: #000000;
}
#editor::selection {
background: var(--selection-background);
}
//JavaScript Part
document.documentElement.style.setProperty("--selection-background", "#A4CDFF");
You can't apply styles to psuedo-elements in JavaScript.
You can, however, append a <style> tag to the head of your document (or have a placeholding <style id='mystyles'> and change its content), which adjusts the styles. (This would work better than loading in another stylesheet, because embedded <style> tags have higher precedence than <link>'d ones, making sure you don't get cascading problems.
Alternatively, you could use different class names and have them defined with different psuedo-element styles in the original stylesheet.
I posted a question similar to, but not completely like, this question.
I found a way to retrieve and change styles for pseudo elements and asked what people thought of the method.
My question is at Retrieving or changing css rules for pseudo elements
Basically, you can get a style via a statement such as:
document.styleSheets[0].cssRules[0].style.backgroundColor
And change one with:
document.styleSheets[0].cssRules[0].style.backgroundColor = newColor;
You, of course, have to change the stylesheet and cssRules index. Read my question and the comments it drew.
I've found this works for pseudo elements as well as "regular" element/styles.
An old question, but one I came across when try to dynamically change the colour of the content of an element's :before selector.
The simplest solution I can think of is to use CSS variables, a solution not applicable when the question was asked:
"#editor::-webkit-scrollbar-thumb:vertical {
background: --editorScrollbarClr
}
Change the value in JavaScript:
document.body.style.setProperty(
'--editorScrollbarClr',
localStorage.getItem("Color")
);
The same can be done for other properties.
Looks like querySelector won't work with pseudo-classes/pseudo-elements, at least not those. The only thing I can think of is to dynamically add a stylesheet (or change an existing one) to do what you need.
Lots of good examples here:
How do I load css rules dynamically in Webkit (Safari/Chrome)?
I have assigned an element a class which has following CSS:
.cls {
display:none !important;
}
When I try to show this element with jQuery
$(".cls").show();
It does not work.
How can I show this element?
$('.cls').attr('style','display:block !important');
DEMO
Although question has been asked long back but its still relevant for new coders/beginners. Generally this situation comes when you have already applied some class which overriding the display behavior using !important property.
Other answers are also relevant to the question and its a matter of achieving the same goal with different approach. I would recommend to achieve it using already available classes in the same library (bootstrap here), instead of writing custom class as these days when most of us are using Bootstrap classes to build the layout.
<div id='container' class="d-flex flex-row align-items-center">
.....
</div>
If you see in the above code, we are using d-flex class for setting display property of this container. Now if I am trying to show/hide this container using
$('#container').show()
or
$('#container').hide()
It will not work as per expectation because of
As d-flex is already using !important property
Jquery's show() method will add display:block not display:flex to the css property of container.
So I will recommend to use hidden class here.
To show container
$('#container').removeClass('hidden')
To hide container
$('#container').addClass('hidden')
2 ways of doing this,
1) Remove the !important from your .cls class,
.cls{
display: none;
}
But I assume, you'd have used this elsewhere so it might cause regression.
2) What you could alternatively do is, have a another class and toggle that,
.cls-show{
display: block !important;
}
And then in your javascript,
$('.cls').addClass(".cls-show");
Then when you need to hide it again, you can,
$('.cls').removeClass('.cls-show');
This will help you keep your markup clean and readable
!important; remove all rules and apply the css desfined as !important;. So in your case it is ignoring all rules and applying display:none.
So do this:
.cls {
display:none
}
See this also
If the only property in the CLS class selector is the display one, you can do this and don't need to add any extra classes or modify the inline style.
To show them:
$('.cls').removeClass("cls").addClass("_cls");
To hide them:
$('._cls').removeClass("_cls").addClass("cls");
Just had this exact issue, here's what I did
first, I added another class to the element, such as:
<div class="ui-cls cls">...</div>
Then in the javascript:
$('.ui-cls').removeClass('cls').show();
The nice thing is that you can also have this code to hide it again:
$('.ui-cls').hide();
and it doesn't matter how many times you hide/show, it'll still work
This question already has answers here:
How to reset/remove CSS styles for a specific element or selector only
(17 answers)
Closed last month.
I know this question was asked before, but before marking it as a duplicate, I want to tell you that my situation is a little different from what I found on the internet.
I'm building and embedded script that people can put it on their sites. This script creates a div with a certain width/height and some information in it.
My problem is that some websites declare styles for div that are inherited by my div as well.
for example:
div{
background-color:red;
}
so if I don't set any background color to my div, it will show red even if I don't want that.
The only solutions I come along is to overwrite as many css proprieties, this way my div will show exactly as I want.
The problem with this solution is that there are too many css proprieties to overwrite and I want my script to be as light as it can be.
So my question is if you know another solution to my problem.
It can be in css/javascript /jQuery.
Thanks
"Resetting" styles for a specific element isn't possible, you'll have to overwrite all styles you don't want/need. If you do this with CSS directly or using JQuery to apply the styles (depends on what's easier for you, but I wouldn't recommend using JavaScript/JQuery for this, as it's completely unnecessary).
If your div is some kind of "widget" that can be included into other sites, you could try to wrap it into an iframe. This will "reset" the styles, because its content is another document, but maybe this affects how your widget works (or maybe breaks it completely) so this might not be possible in your case.
Only set the relevant / important CSS properties.
Example (only change the attributes which may cause your div to look completely different):
background: #FFF;
border: none;
color: #000;
display: block;
font: initial;
height: auto;
letter-spacing: normal;
line-height: normal;
margin: 0;
padding: 0;
text-transform: none;
visibility: visible;
width: auto;
word-spacing: normal;
z-index: auto;
Choose a very specific selector, such as div#donttouchme, <div id="donttouchme"></div>. Additionally, you can add `!important before every semicolon in the declaration. Your customers are deliberately trying to mess up your lay-out when this option fails.
You could try overwriting the CSS and use auto
I don't think this will work with color specifically, but I ran into an issue where i had a parent property such as
.parent {
left: 0px;
}
and then I was able to just define my child with something like
.child {
left: auto;
}
and it effectively "reset" the property.
Technically what you are looking for is the unset value in combination with the shorthand property all:
The unset CSS keyword resets a property to its inherited value if it inherits from its parent, and to its initial value if not. In other words, it behaves like the inherit keyword in the first case, and like the initial keyword in the second case. It can be applied to any CSS property, including the CSS shorthand all.
.customClass {
/* specific attribute */
color: unset;
}
.otherClass{
/* unset all attributes */
all: unset;
/* then set own attributes */
color: red;
}
You can use the initial value as well, this will default to the initial browser value.
.otherClass{
/* unset all attributes */
all: initial;
/* then set own attributes */
color: red;
}
As an alternative:
If possible it is probably good practice to encapsulate the class or id in a kind of namespace:
.namespace .customClass{
color: red;
}
<div class="namespace">
<div class="customClass"></div>
</div>
because of the specificity of the selector this will only influence your own classes
It is easier to accomplish this in "preprocessor scripting languages" like SASS with nesting capabilities:
.namespace{
.customClass{
color: red
}
}
Try this: Create a plain div without any style or content outside of the red div. Now you can use a loop over all styles of the plain div and assign then to your inner div to reset all styles.
Of course this doesn't work if someone assigns styles to all divs (i.e. without using a class. CSS would be div { ... }).
The usual solution for problems like this is to give your div a distinct class. That way, web designers of the sites can adjust the styling of your div to fit into the rest of the design.
As long as they are attributes like classes and ids you can remove them by javascript/jQuery class modifiers.
document.getElementById("MyElement").className = "";
There is no way to remove specific tag CSS other than overriding them (or using another element).
you may use this below option.
<style>
div:not(.no_common_style){
background-color:red;
}
</style>
now , if their any place where you do not want to apply default style you can use 'no_common_style' class as class.
ex:
<div class="no_common_style">
It will not display in red
</div>
From what I understand you want to use a div that inherits from no class but yours. As mentioned in the previous reply you cannot completely reset a div inheritance. However, what worked for me with that issue was to use another element - one that is not frequent and certainly not used in the current html page. A good example, is to use instead of then customize it to look just like your ideal would.
area { background-color : red; }
One simple approach would be to use the !important modifier in css, but this can be overridden in the same way from users.
Maybe a solution can be achieved with jquery by traversing the entire DOM to find your (re)defined classes and removing / forcing css styles.