问题
Example use (what I want)
div::after {
content: var(--mouse-x) ' / ' var(--mouse-y);
}
Test case showing it NOT working:
CodePen: CSS Variables in Pseudo Element's "content:" Property (a test case) by Jase Smith
document.addEventListener('mousemove', (e) => {
document.documentElement.style.setProperty('--mouse-x', e.clientX)
document.documentElement.style.setProperty('--mouse-y', e.clientY)
// output for explanation text
document.querySelector('.x').innerHTML = e.clientX
document.querySelector('.y').innerHTML = e.clientY
})
/* what I want!! */
div::after {
content: var(--mouse-x, 245)" / " var(--mouse-y, 327);
}
/* setup and presentation styles */
div::before {
content: 'mouse position:';
}
div {
position: absolute;
top: 0;
left: 0;
transform: translate(calc(var(--mouse-x, 245) * 1px), calc(var(--mouse-y, 327) * 1px));
width: 10em;
height: 10em;
background: #ff3b80;
color: #fff;
display: flex;
flex-flow: column;
align-items: center;
justify-content: center;
border-radius: 100%;
will-change: transform;
}
body {
margin: 2em;
font-family: sans-serif;
}
p {
max-width: 50%;
min-width: 25em;
}
<!-- test case: element with pseudo element -->
<div></div>
<!-- explanation (not test case) -->
<main>
<pre><code>div::after {
content: var(--mouse-x) ' / ' var(--mouse-y);
}</code></pre>
<h1>If this worked...</h1>
<p>
We should see something like this: <b><span class="x">245</span> / <span class="y">327</span></b> updating with the mousemove coordinates inside the pseudo <i>::after</i> element for the div.
</p>
</main>
回答1:
Edit for clarity: CSS custom properties with a numerical value can be displayed in a pseudo-element's content
property via a CSS counter.
div {
--variable: 123;
}
span:after {
counter-reset: variable var(--variable);
content: counter(variable);
}
<div>The variable is <span></span>.</div>
.coordinates:before {
counter-reset: x var(--x) y var(--y);
content: 'The coordinates are (' counter(x) ', ' counter(y) ').';
}
<div class="coordinates" style="--x: 1; --y: 2"></div>
Original Answer
Got it to work using a hack involving CSS Counters. Enjoy.
div::after {
counter-reset: mouse-x var(--mouse-x, 245) mouse-y var(--mouse-y, 245);
content: counter(mouse-x) " / " counter(mouse-y);
}
Full code in action:
document.addEventListener('mousemove', (e) => {
document.documentElement.style.setProperty('--mouse-x', e.clientX)
document.documentElement.style.setProperty('--mouse-y', e.clientY)
// output for explanation text
document.querySelector('.x').innerHTML = e.clientX
document.querySelector('.y').innerHTML = e.clientY
})
/* what I want!! */
div::after {
counter-reset: mouse-x var(--mouse-x, 245) mouse-y var(--mouse-y, 245);
content: counter(mouse-x) " / " counter(mouse-y);
}
/* setup and presentation styles */
div::before {
content: 'mouse position:';
}
div {
position: absolute;
top: 0;
left: 0;
transform: translate(calc(var(--mouse-x, 245) * 1px), calc(var(--mouse-y, 327) * 1px));
width: 10em;
height: 10em;
background: #ff3b80;
color: #fff;
display: flex;
flex-flow: column;
align-items: center;
justify-content: center;
border-radius: 100%;
will-change: transform;
}
body {
margin: 2em;
font-family: sans-serif;
}
p {
max-width: 50%;
min-width: 25em;
}
<!-- test case: element with pseudo element -->
<div></div>
<!-- explanation (not test case) -->
<main>
<pre><code>div::after {
content: var(--mouse-x) ' / ' var(--mouse-y);
}</code></pre>
<h1>If this worked...</h1>
<p>
We should see something like this: <b><span class="x">245</span> / <span class="y">327</span></b> updating with the mousemove coordinates inside the pseudo <i>::after</i> element for the div.
</p>
</main>
回答2:
You need quotation marks around the values of your custom properties.
document.documentElement.style.setProperty('--mouse-x', "'" + e.clientX + "'")
document.documentElement.style.setProperty('--mouse-y', "'" + e.clientY + "'")
回答3:
I'm not quite sure if I understood your question correctly, but I think here's a solution...
You can define a custom attribute to your <div>
element.
<div data-position></div>
Then assign the position in this attribute with javascript:
var position = e.clientX + " " + e.clientY
document.querySelector("div").setAttribute('data-position', position)
Finally use the attr()
CSS function in the content
property of your pseudoelement.
div::after {
content: attr(data-position);
}
And voila.
Code Snippet:
document.addEventListener('mousemove', (e) => {
document.documentElement.style.setProperty('--mouse-x', e.clientX)
document.documentElement.style.setProperty('--mouse-y', e.clientY)
var position = e.clientX + "/" + e.clientY
document.querySelector("div").setAttribute('data-position', position)
// output for explanation text
document.querySelector('.x').innerHTML = e.clientX
document.querySelector('.y').innerHTML = e.clientY
})
/* what I want!! */
div::after {
content: attr(data-position);
}
/* setup and presentation styles */
div::before {
content: 'mouse position:';
}
div {
position: absolute;
top: 0;
left: 0;
transform: translate(calc(var(--mouse-x, 245) * 1px), calc(var(--mouse-y, 327) * 1px));
width: 10em;
height: 10em;
background: #ff3b80;
color: #fff;
display: flex;
flex-flow: column;
align-items: center;
justify-content: center;
border-radius: 100%;
will-change: transform;
}
body {
margin: 2em;
font-family: sans-serif;
}
p {
max-width: 50%;
min-width: 25em;
}
<div data-position></div>
<span class="x"></span>/<span class="y"></span>
来源:https://stackoverflow.com/questions/40164169/using-css-variables-custom-properties-in-a-pseudo-elements-content-propert