I'm looking for a way to use a pure CSS selector (not script) to select an element's attribute, not the element itself. I know XPath can do it but can a CSS selector?
Example, given:
<img alt="image" src="photo.jpg">
Can I get to the src attribute with a CSS selector?
Update:
I don't want to set any element's values, I just want to select the text "photo.jpg".
Because CSS selectors originated as a fundamental part of CSS, and CSS can only apply styles to elements (since attributes are just element metadata, not standalone objects), CSS selectors cannot match attributes alone within CSS.
But I suspect you're not actually asking about CSS here. You're asking about selectors alone. You're probably using a web automation tool such as Selenium or one of the numerous HTML parsing libraries out there that support either CSS selectors or XPath. Some of these libraries support non-element selectors in the form of pseudo-elements such as ::attr() (I don't remember which ones), you haven't mentioned which tool you're using so I can't tell you for sure if you could use it. Note that this is not the same thing as the CSS attr() function mentioned in the comments — that is a CSS function, which is a value, not a selector, and therefore it cannot be used in a selector.
But if your library doesn't have such a feature then you'll need to either select the img element directly and query its src attribute separately (again, how you do this depends entirely on what you're using, which is why it helps to be specific about this sort of thing), or use XPath if possible.
CSS Tricks has an article that I believe answers your question:
https://css-tricks.com/almanac/selectors/a/attribute/
If you are trying to set the value of a certain element attribute using css, I'm pretty certain that is impossible for anything other than the content property.
CSS is not a programming language and can't process data.
Its sole purpose it to tell the browser how a certain element should look like, like in coloring a text red.
To process data in a web page you use javascript, which can make use of CSS rules though, to grab a certain type of elements in a web page, for example this, which will return a list of all elements of type img
var imglist = document.querySelectorAll('img');
Now, having a list you can loop through it and get each src like this
Array.prototype.slice.call(document.querySelectorAll("img")).forEach(function(img) {
var imgsrc = img.src;
// imgsrc now holds the image url, in your case "photo.jpg"
});
Related
I'm trying to select <a> elements that are not the parents of <img> elements. (Note: if it's relevant some of the anchors I want to select are childless.) I tried this:
a > :not(img) {}
and this:
a:not(> img) {}
but neither of them seem to work. How would I accomplish this in CSS?
There is a spec, currently in draft, for a :has() pseudo-class. No browser supports it yet. If the spec is someday approved and implemented, you'd be able to do this:
a:not(:has(img)) {
// Styles
}
The MDN page says that :has would never work in stylesheets, only in JavaScript; but in saying that, it links to a section of the spec about a "dynamic selector profile" that apparently no longer exists.
I think the browser vendors typically have a problem with implementing CSS features that require knowledge of the DOM that only exists after the selected element is created, so I don't know if we should get our hopes up for this. Someone who follows the mailing lists or is generally smarter than me might offer a better prognosis.
Unfortunately, no. You'd need to use jQuery.
You could do some kind of workaround using CSS:
Assign a class to links that do not have child elements that are images and use that class to style the links as normal (e.g. a.class{color: red})
Assign a class to links that do have an image child element, and use a:not(.class){} to change their color
Reason: There is no parent selector in CSS. See:
Is there a CSS parent selector?, CSS Parent/Ancestor Selector
This question already has answers here:
How to apply CSS to iframe?
(28 answers)
Closed 6 years ago.
I tend to apply my own custom CSS documents to certain sites, since I prefer dark backgrounds with light text as opposed to the vice-versa standard, and very few sites have a "dark mode" or otherwise cater to that preference, this site itself being an excellent example.
However, I was recently stricken by something odd - an entire HTML document nested inside of another one. (I now understand this is achieved via use of an <iframe> and so it's nearly impossible to style without JS or something) I can only apply the custom stylesheet to the parent document, though.
So, long story short, I'm wondering what sort of selectors I would have to use to target elements of the nested document only - for example, selecting the <body> of the nested document. Would I refer to a body in a html in a !DOCTYPE that is also in a body? What about recursively nested documents?
Whether this nesting thing is poor practice or not does not immediately concern me -- there seems to be a valid use case for it and, regardless, I'm not building the site. What I DO care about is how to add styles to it externally.
Assuming you literally have a document that has been 'injected' into another document, you would simply target it with the expected identifiers:
To target elements unique to the sub-document:
body body [element] {
}
To target elements that exist within both documents, you would just use the standard:
[element] {
}
The above would apply the style to any desired element that is contained within either document.
Please be aware that you cannot style an iframe inside a document with CSS -- you'd either have to find a way to manipulate the iframe's CSS itself, or use JavaScript to target the desired elements with document.getElementById().
Hope this helps! :)
<div class="thumbnail-popular" style="background: url('http://images.gogoanime.tv/images/upload/Go!.Princess.Precure.full.1812487.jpg');"></div>
I am trying to get the url component of this div class but I seem to be unable to fetch that specific data in the div class.
I have looked into making use of attributes but my attempts have been unsuccessful so far.
Usage of this CSS selector is through Kimonolabs.
div.thumbnail-popular should get you the element you're looking for — unless there is more than one such element, in which case you will need to narrow down your selector.
For example you will need to find out if this particular element belongs to a specific parent, or is the first, second, ... nth child, or any other information about the surrounding elements in the page that you're working with.
The background URL is in a style attribute on this element, so you will need to extract that attribute as described here. However you will still need to parse the declarations inside the style value in order to get the URL; I am not sure if it is possible to do this through kimono as I am not familiar with it (I'm not sure what its advanced mode really does, and it's difficult to tell from the lone screenshot that is provided in that help article).
considering I have a single css file for my entire website (and that doing so is an usual technique), I was wondering if there is a way to select website-wide attributes like body (or any other attribute in fact) according to the current page using only css.
Something like
body:in('index.html') {
some properties;
}
body:in('contact.html') {
other properties;
}
Again, css only. I know the simple solutions using things like php, js, jquery...
Selectors have no information about the document beyond what is presented in the DOM tree, and the DOM does not expose information about the page according to its file name, URL, or any other such properties.
Historically there was a #document at-rule for querying the current URL, but it was removed from the Conditional Rules Level 3 module. The most likely reason for this is the lack of cross-vendor implementations, as the only known implementation exists in Gecko, as #-moz-document. It's so bad, that the only uses for it that you'll spot in the wild are not to apply CSS based on a certain page, but solely as a CSS hack for Firefox.
As you've stated, the simplest workaround for this is to have each page apply a unique class to the html or body element and select according to that class, whether via hardcoding, or dynamically.
you could add and id atribute to the body tag and style things inside it using:
body#contact div{
background:#376;
color:#857;
/*etc*/
}
more information about selectors in http://www.w3.org/TR/css3-selectors/
I want to know what things can be done "ONLY" with CSS , that are not available using dynamically updated style "attributes" using Javascript. So far I know:
Media queries
Pseudo tags
Any more?
Update:
This question was closed but I asked it as I am trying to decide on the technology to use for a project, but one of the options cannot use CSS style sheets, and can only manipulate the style attribute using javascript.
Inline style attributes can only contain property declarations (e.g. width: 10px or color: red). They can't contain any other CSS constructs: not selectors, at-rules (e.g. #import, #media, #font-face), etc. Just property declarations.
However, they play a big role in the cascade: any styles for an element with that attribute take highest precedence (after considering !important of course).
There's actually an entire module devoted to style attributes, by the way, but it's not essential reading for authors.
So, anything that isn't a CSS declaration, is only possible in a stylesheet, not a style attribute. Not sure if that's what you're asking...
Note that media queries and #media rules are not the same thing; media queries can exist in areas outside of stylesheets too, like HTML's media attribute, where they're next most commonly found.
I believe pseudo classes (:hover etc..) and pseudo elements (:after, :before) cannot be added/manipulated via JS (via the style property i mean) because they are not part of the DOM.