I inserted a button in header of page and I want change padding and margin of another element when a user clicks on this button. I used this code but didn't work:
a:clicked
{
#header
{
padding:0 40px 0 40px !important;
}
}
In css docs, programmers use # symbol at begin of their code. Can I use that? How?
CSS has no mechanism for giving your styles "state." It's difficult to make decisions in CSS based on "The user clicked a button," etc.
Difficult, but not impossible. One thing you could do is change the button to a checkbox and use the :checked selector. Another option is to hide the checkbox and make the button a label for it; this is known as the CSS checkbox hack.
The usual way, though, is to use Javascript to add/remove a class from an element when a button is clicked, then style based on the existence of that class. This is probably more maintainable since it doesn't require hacks to your HTML. Note that it won't work for users who have blocked Javascript.
Related
We embed React components in our website. There are some basic styles which apply to our buttons, which come from the user agent (such as outline on focus) and from the HTML/CSS environment where we embed our React components.
We want our React components to be style independent. Since we also use our components in widgets, we can't really control the external environment.
One solution is for our basic Button element to render <div role="button" ... instead of an actual button element.
Is there any reason to avoid this practice, such as browser support, functionality, etc.?
Don't do this. Don't. It's accessibility hell. <button>s are interactive. <div>s are not. This is worst practice.
As you commented, focus is not available either on a <div role="button" ...>, which is quite nicely baked into a <button>.
while, i'm not sure but maybe we can control it using unique/different class name
Try using this (you can add it to your reset.css):
*:focus { outline-width: 0px !important; }
This should completely eliminate any visible outline, despite element's class name (or if it doesn't have a class name).
If at some point you'll need outline back, you can add it directly to your custom class.
Just like removeAttribute in JavaScript, after which the element won't be visible in the source.
You cannot remove an element from the DOM tree using CSS. You can only prevent it from being rendered in the layout with display: none; doing so does not prevent it from responding to events or cause it to be ignored by CSS selectors such as + and :nth-child(). You won't be able to interact with an element that's not there so you wouldn't be able to trigger events the usual way, but its "essence" remains, so to speak.
Its not possible with CSS.
Even if you use display:none, the element will be still in DOM tree.
CSS is for styling not for DOM manipulation. Use JavaScript for that.
display: none;
'Unlike the visibility property, which leaves an element in normal document flow,display: none removes the element completely from the document. It does not take up any space, even though the HTML for it is still in the source code. This is because it is, indeed, removed from the document flow. For all intents and purposes, the item is gone. This can be a good thing or a bad thing, depending on what your intentions are. It can also be damaging to your page if you misuse this property!'
https://www.lifewire.com/display-none-vs-visibility-hidden-3466884
You can use display: none to hide an element but it will still be on the DOM.
You can also use visibility: hidden and it will also still be on the DOM but the DOM will reflect the same vertical flow even though the element is hidden. In other words if the element is a block, a block space will still be reserved for the hidden element. And with display: none the space will also be removed along with the element as it is hidden.
Unless you use JavaScript, with CSS you are only changing the visibility of a DOM element that is existent on the DOM. Which can absolutely serve your purpose depending on what you are trying to do.
If you need more help, just comment with more detail and I'd be glad to help.
You actually can. Not directly in CSS but in combination with Javascript/jQuery you could.
In HTML give a class of "removeFromDom" to the Elements you want to have removed.
<p class="removeFromDom">your text here</p>
In CSS you add these Lines to make it invisible, if JS is not working.
.removeFromDom { display:none !important; visibility:hidden !important; }
In a jQuery file, that you load on any site, create this function::
$(document).ready(function() {
$(".removeFromDom").remove();
});
Et voila.. your jQuery file removes your Items from the DOM. I wouldn't recommend it for security reasons if there is a link nobody should be able to see anytime..
I've grid with several boxes in (<div>). Each box has inside a list with couple/ several links (simple ul li list with <a> elements). This link list is hidden, it shows only on hover.
It works really fine, but I have accessibility issue, namely, I can't get into any list element with "tab" key (box <div> works ok, it get focus, so the list is showing up), it is just skipping to next box element. I've tried with adding tabindex on each box and each list element inside, but it seems that this is not the solution.
Is there any CSS/ HTML solution for that? I can of course write simple JS, that will check where is focus and if focus has parent with focus option, but I would like to avoid it if possible.
How did you hide the link list? Using display: none or using visibility: hidden. (And that you apply this only to the list elements or also to the div? From your description, I guess it applies only to the list elements.) Content that is hidden using display: none is not keyboard accessible.
In order to make the list appear on hover, are you using a JavaScript event handler or CSS? If you are using JavaScript, you probably need to add an event listener that responds to keyboard events (e.g. onfocus, but as mentioned above, content hidden with display: none won't receive focus). In CSS, I always recommend adding the :focus pseudo-class whenever :hover is used (unless you want different styles for these things).
You may need to write some JavaScript that toggles the visibility of the lists when a parent div receives focus. (If you have tabindex on the div elements, as you say, they should already be able to receive focus.)
I have an <img> element within a <div> element. I want the entire div (including the image) to scale down 10% (using transform) whenever the <div> is being clicked on. I have gotten it to work, but with one small issue: if the user clicks the image inside the div, nothing happens, whereas if the user clicks the background of the div, it works.
Essentially, how can I get the :active selector of .MyDiv:hover:active { /*scaling logic here*/ } to also work when children of MyDiv are clicked.
All help is greatly appreciated and I always accept an answer!
The :active pseudo-class and the div element
First things first, I'm pretty sure in a div element shouldn't have an activation state in the first place.
If we read through the user action pseudo-classes :hover, :active, and :focus section of the Selectors Level 3 W3C Recommendation, we find this:
The :active pseudo-class applies while an element is being activated by the user. For example, between the times the user presses the mouse button and releases it. On systems with more than one mouse button, :active applies only to the primary or primary activation button (typically the "left" mouse button), and any aliases thereof.
Now if we head over to the Interactive Content section of the HTML5 W3C Editor's Draft, we find this:
Certain elements in HTML have an activation behavior, which means that the user can activate them.
The user agent should allow the user to manually trigger elements that have an activation behavior, for instance using keyboard or voice input, or through mouse clicks. When the user triggers an element with a defined activation behavior in a manner other than clicking it, the default action of the interaction event must be to run synthetic click activation steps on the element.
I mention the HTML5 Editor's Draft over the HTML401 Recommendation as the HTML401 document doesn't go into great detail about activation states or user interaction. It does however mention activation on elements like the a element, but doesn't mention anything about it when defining the div element.
The div element doesn't have an "activation state" defined in the HTML5 recommendation. It has no Interactive Content category (unlike the a element) and doesn't state that an active state can be applied to it.
A Workaround
As discussed above, the div element shouldn't accept an :active state. For this reason I'm going to modify the HTML to use an element which does. For this, I'm using the a element:
<a href="javascript: void(0)">
<img />
</a>
Now this alone doesn't fix the IE issue. If you see this JSFiddle example, when clicking on the img element the a container isn't given an active state. So what can we do to fix this? Instead of just using :hover:active, I'm also going to use :hover:focus:
a:hover:active,
a:hover:focus {
outline: 0; /* Reset the default anchor tag focus style. */
background: #f00;
}
This gives us similar functionality on IE and all other browsers, as can be seen in this JSFiddle demo.
Two (potentially undesirable) side effects
The problem with this approach is that the element will retain its focussed state and you can now achieve this effect by accessing the element using your keyboard's tab key. Whenever you hover over the element in its focussed state, its style will change. It's not up to me to decide whether this is an undesirable side effect, however.
Your element is now a link. The href property is required in order for the element to be focussed in the first place.
Extra styling
As we're now using an a element instead of a div element, so we'll need to reset any browser default styles which distinguish your element as a link. For this we can simply:
a {
color: #000; /* Reset the color to black. */
cursor: default; /* Reset the cursor to default. */
text-decoration: none; /* Remove the underline. */
}
a img {
border: none; /* Remove border from image. */
}
Final JSFiddle demo.
Is it possible to set CSS for disabled textboxes? I don't want the automatic gray-out in Firefox/Chrome.
The reason is that I'm sometimes disabling textboxes right before submitting a form so they don't get unnecessarily transmitted (and clutter the URL), and that gray-out behavior is degrading the user experience by creating flicker.
Help?
You should be able to style the text box by defining a class with how you want it to look, and then adding the class when you disable the input. If you're not worried about IE6 compatibility, then try using attribute selectors:
input[disabled="disabled"] {
/* your CSS style */
}
You should be able to use any styles you'd use on any other element.