HTML DOM Element klaslys
❮ ElementvoorwerpVoorbeeld
Voeg 'n "myStyle"-klas by 'n element:
element.classList.add("myStyle");
Verwyder die "myStyle"-klas van 'n element:
element.classList.remove("myStyle");
Wissel tussen twee klasse vir 'n element:
element.classList.toggle("newStyle");
Meer voorbeelde hieronder.
Definisie en gebruik
Die classListeiendom gee die CSS-klasname van 'n element terug.
Die classListeiendom gee 'n DOMTokenList-objek terug.
Die classListeiendom is leesalleen, maar jy kan add() en remove() metodes gebruik om CSS-klasse by te voeg of te verwyder.
Let wel
Die classListeiendom is nuttig om beide CSS-klasse by 'n element by te voeg, te verwyder en te wissel.
Sien ook:
Sintaksis
element.classList
Eiendomswaardes
| Value | Description |
| length | The number of classes in the list. This property is read-only. |
Metodes
| Method | Description |
| add(class1, class2, ...) |
Adds one or more classes. |
| contains(class) |
Returns true if an element has the class, otherwise false.
|
| item(index) | Returns the class name with a specified index. Index starts at 0. Returns null if the index is out of range. |
| remove(class1, class2, ...) | Removes one or more classes from an element. Removing a class that does not exist, does NOT throw an error. |
| toggle(class, true|false) | Toggles between a class for an element. It removes the class and returns false.If the class does not exist, it adds the class and returns true.The optional second parameter is a boolean that forces the class to be added or removed, regardless of whether or not it already exists. The second parameter is not supported in Internet Explorer 11 or earlier. |
Terugkeerwaarde
| Type | Description |
| Object | A DOMTokenList. A list of the class names of an element. |
Meer voorbeelde
Voeg verskeie klasse by die element:
element.classList.add("myStyle", "anotherClass", "thirdClass");
Verwyder veelvuldige klasse van 'n element:
element.classList.remove("myStyle", "anotherClass", "thirdClass");
Hoeveel klasname het die element:
let numb = element.classList.length;
Kry die klasname van die "myDIV"-element:
<div id="myDIV" class="myStyle anotherClass thirdClass">
<p>I am myDIV.</p>
</div>
const list = document.getElementById("myDIV").classList;
Kry die eerste klas van 'n element:
let className = element.classList.item(0);
Het 'n element 'n "myStyle"-klas?
let x = element.classList.contains("myStyle");
Verwyder "anotherClass" as 'n element 'n "myStyle"-klas het.
if (element.classList.contains("mystyle")) {
element.classList.remove("anotherClass");
}
Wissel tussen klasse om 'n aftrekknoppie te skep:
document.getElementById("myBtn").onclick = function() {myFunction()};
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
Skep 'n taai navigasiebalk:
// Get the navbar
var navbar = document.getElementById("navbar");
//
Get the offset position of the navbar
var sticky = navbar.offsetTop;
// Add the sticky class to the navbar when you reach its scroll position. Remove the sticky class when you leave the scroll position.
function myFunction() {
if (window.pageYOffset
>= sticky) {
navbar.classList.add("sticky")
}
else {
navbar.classList.remove("sticky");
}
}
Blaaierondersteuning
element.classList word in alle blaaiers ondersteun:
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Yes | 10-11 | Yes | Yes | Yes | Yes |
❮ Die elementvoorwerp