I need to select a css class named .slider::-webkit-slider-thumb to change a property. I have tried a multiple array of options, but JS doesn't seem to select it.
document.addEventListener("DOMContentLoaded", function (event) {
var slider = document.getElementById("importanceSlider");
var knob = document.getElementsByClassName(".slider::-webkit-slider-thumb");
knob.style.background = "#ffffff"; });
CSS:
.slidercontainer{
width: 100%;
}
.slider {
-webkit-appearance: none;
width: 100%;
height: 25px;
background: #e9ecef;
outline: none;
border-radius: 50px;
}
.slider::-webkit-slider-thumb {
-webkit-appearance: none;
width: 10%;
height: 25px;
background: #dc3545;
border-radius: 50px;
}
HTML:
<div class="slidecontainer">
<input type="range" min="0" max="10" value="5"
class="slider" id="importanceSlider" name="importance">
</div>
I want to change the width value of .slider::-webkit-slider-thumb in particular, depending on the value of the slider.
Any help would be appreciated
First, you should be aware that the pseudo-selector is non-standard...
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
...so be wary using it.
If you are using it in a compatible browser there's a further issue:
You seem to be confusing querySelector and getElementsByClassName. The former allows you to grab elements using CSS selectors, the latter doesn't. Also, the latter returns a list of nodes.
Also, you should think about using a stylesheet rather than naming your class like that.
Here's a couple of solutions:
1) querySelector
var knob = document.querySelector(".slider");
knob.classList.add('blue');
.slider::-webkit-slider-thumb {}
.blue { background-color: blue; }
<button class="slider">Carrot</button>
2) getElementsByClassName
var knob = document.getElementsByClassName("slider");
// Grab the first element from the list
knob[0].classList.add('blue');
.slider::-webkit-slider-thumb {}
.blue { background-color: blue; }
<button class="slider">Carrot</button>
Of course if you have lots of these elements you'll need to iterate over them. You can do that with getElementsByClassName, or you can use querySelectorAll instead:
var knobs = document.querySelectorAll(".slider");
[...knobs].forEach(knob => knob.classList.add('blue'));
.slider::-webkit-slider-thumb {}
.blue { background-color: blue; }
<button class="slider">Carrot</button>
<button class="slider">Spam</button>
<button class="slider">Goat</button>
Related
I want to change the value of one of the attributes of css class dynamically
Here's my scenario:
I've many elements using one class, instead of getting them all and looping them over and applying style, I want to change the value of one of the attributes of class, which is alredy applied on them. for example
.prodName {
max-width: 270px;
display: block;
}
above class is being used by many elements, and I want to alter one of the attributes of that class like
.prodName {
max-width: 350px <---
display: block;
}
is there any simple method for this in javascript.
Before I post this question, I already searched but didn't find anything easy and useful.
thanks in advance to helping hands.
You can use CSS variables for this case.
const root = document.querySelector(':root');
function play() {
root.style.setProperty('--size', '300px');
}
:root {
--size: 100px;
}
.container {
background-color: red;
width: var(--size);
height: var(--size);
cursor: pointer;
}
<div class="container" onclick="play()"></div>
The only problem with the above approach is support in older browsers. If you have to support IE, and older browsers where CSS variable support is not present, you can handle this problem by adding a class to the body/parent container.
function play() {
document.body.classList.add('large')
}
.container {
background-color: red;
width: 100px;
height: 100px;
cursor: pointer;
}
.large .container {
width: 300px;
height: 300px;
}
<div class="container" onclick="play()"></div>
Add new class to CSS:
.mw350 {
max-width: 350px;
}
Then add new class to the element in JS:
document.querySelector('.prodName').className += ' mw350'; // <-- better to select using unique IDs, like '#prodNameElement'
If you are going to control the css class/attribute change from ts, maybe with a function or var change, you might want to use ngClass: https://www.freecodecamp.org/news/angular-ngclass-example/ and have all the logic where you want it, easily accessible.
Many old libraries rely on className to identify their context.
So a click handler can look like this:
function click(event)
{
if (event.target.className.indexOf('something')!= -1){
// Do something
}
}
But this will fail if the target element is an svg element.
The reason is that svg className is an object of type SVGAnimatedString
Is there any temporary workaround to avoid issues with old code?
Change the handler is not an option as it is unclear how many libraries have this code and changing library code could be impossible.
Changing the SVG to some other element is not an option as the SVG is a part of a 3rd party control.
Update:
"Is there any temporary workaround to avoid issues with old code?"
Seems unclear based on the comments. My goal is to see if there is any polyfill or any other technique that I can use to temporarily make SVG elements have their className as string until 3rd party libraries catch up. Then I will update the 3rd party libraries and revert this code.
As of now - simply overwriting the className doesn't seem to be possible as it only seems to have getter and no setter for SVG elements.
function oldModuleHandler(e) {
if (e.className.indexOf("initial") > -1 || e.className.indexOf("fixed") > -1) {
alert('Behaves as expected.');
}
}
function theFix(e) {
e.className = "fixed";
}
<html>
<head>
</head>
<body>
<div style="border:2px solid silver;">
<h2>Demo:</h2>
Click on the left square, it is a div and it will have it's color changed to green because .className.indexOf will go through just fine. Same does not apply for SVG.<br/> <br/><br/>
<div onclick="theFix(this); oldModuleHandler(this)" class="initial">
</div>
<svg class="initial" onclick="theFix(this); oldModuleHandler(this)"></svg>
<div style="clear:both;"></div>
</div>
<style>
.fixed {
background: green !important;
width: 80px;
height: 80px;
float: left;
}
.initial {
background: transparent;
border: 1px solid black;
width: 80px;
height: 80px;
float: left;
}
</style>
</body>
</html>
Update 2
I added a small code to demonstrate the issue. If you click on the left square (it is a div) - it will work just fine. If you click on the right square - the SVG - it will not work because .className.indexOf() will throw an error.
You might use getAttribute and setAttribute OR 'classList methods :
function oldModuleHandler(e) {
var c = e.getAttribute('class');
if (~c.indexOf("initial") || ~c.indexOf("fixed")) {
alert('Behaves as expected.');
}
}
function theFix(e) {
e.className = "fixed";
e.setAttribute('class', 'fixed')
// OR
e.classList.add('fixed')
}
.fixed {
background: green !important;
width: 80px;
height: 80px;
float: left;
}
.initial {
background: transparent;
border: 1px solid black;
width: 80px;
height: 80px;
float: left;
}
<div style="border:2px solid silver;">
<h2>Demo:</h2>
Click on the left square, it is a div and it will have it's color changed to green because .className.indexOf will go through just fine. Same does not apply for SVG.<br/> <br/><br/>
<div onclick="theFix(this); oldModuleHandler(this)" class="initial">
</div>
<svg class="initial" onclick="theFix(this); oldModuleHandler(this)"></svg>
<div style="clear:both;"></div>
</div>
And/Or look at Proxy API.
I have three different Links that all lead to the same page. But I need the page to load with different CSS settings (depending on which link was clicked, certain elements should be hidden on the new page).
Is that possible? Thank you!
Sure, you can use the :target pseudo-class to do so.
From MDN:
The :target CSS pseudo-class represents a unique element (the target element) with an id matching the URL's fragment.
With target, you click a link, like page.html#some-condition, and in your CSS, listen for that condition. When the id matches the hash in the address bar, you have a match and the target is met.
A link
<div id="some-condition"></div>
#some-condition:target {
/* style appropriately */
}
Here's a quick demo. In this case, the links contain the ids, but as demonstrated above, you can structure things however you'd like.
#red:target ~ .result {
background-color: red;
}
#blue:target ~ .result {
background-color: blue;
}
#green:target ~ .result {
background-color: green;
}
.result {
width: 100px;
height: 100px;
display: inline-block;
border: 1px solid;
background-color: #fff;
transition: 0.3s background-color;
}
<a id="red" href="#red">Red</a>
<a id="blue" href="#blue">Blue</a>
<a id="green" href="#green">Green</a>
<div class="result"></div>
jsFiddle
I've got a simple text button with an image of an arrow next to it. I'm wanting the arrow image to move when someone hovers over the button.
I currently have this working in one instance with JS 'document.getElementById...', but I have several buttons across my site that I'd like to have the same behavior. My first thought would be to use a class instead of an id, and use the same functions.
For whatever reason, document.getElementsByClassName doesn't work - even in one instance.
Here's a simpler version to demonstrate - View on Codepen: https://codepen.io/sdorr/pen/JxYNpg
HTML
<HTML>
hover over me
<div id="block"></div>
hover over me
<div class="block"></div>
CSS
* {
margin: 0;
padding: 0;
}
.button {
color: #000000;
text-decoration: none;
background-color: cyan;
margin: 0;
display: block;
width: 300px;
padding: 20px;
text-align: center;
}
#block {
width: 30px;
height: 30px;
background-color: red;
}
.block {
width: 30px;
height: 30px;
background-color: green;
}
JS
function move() {
document.getElementById("block").style.marginLeft = "35px";
}
function moveBack() {
document.getElementById("block").style.marginLeft = "0px";
}
function moveAlt() {
document.getElementsByClassName("block").style.marginLeft =
"35px";
}
function moveBackAlt() {
document.getElementsByClassName("block").style.marginLeft =
"0px";
}
First off, why isn't the behavior with a class working but an id works fine?
Secondly, would a class solve this issue and be scalable across all buttons with the same two functions (onmouseover / onmouseout)?
If not, any ideas on a solution? I currently have a solution I found using jQuery that does work, but when hovering over one button, all arrow images move across the site. I don't necessarily mind this behavior because only one button is really in view at a time - but I'm trying to learn JS and solve problems with my own solutions!
I greatly appreciate your desire to learn on your own and not rely on premade solutions. Keep that spirit and you will go places!
When it comes to getElementsById, we know this should work for one element, since the function returns a single Element.
However, what does getElementsByClassName return?
(see: https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementsByClassName)
It returns an HTMLCollection which you can iterate over to change an single element's style.
So, to get this to work with JavaScript you need to write a function that will be able to identify the particular div.block you want to move. But, this puts you back to where you started, needing some particular identifier, like an id or a dataset value to pass to the function.
Alternately, based on the HTML structure you provide, you could look for nextElementSibling on the a that get's clicked. But I would set up an eventListener rather than adding a JS function as a value to the onmouseenter property.
const btns = document.getElementsByTagName('a');
/*** UPDATE forEach is a NodeList method, and will fail on HTMLCollection ***/
/* this fails -> Sorry! ~~btns.forEach(button=>{~~
/* the following will work
/**********/
for (let i = 0; i < btns.length; i++){
btns[i].addEventListener('mouseenter', function(e) {
//we pass e to the function to get the event and to be able to access this
const block = this.nextElementSibling;
block.style.marginLeft = "35px";
})
btns[i].addEventListener('mouseleave', function(e) {
const block = this.nextElementSibling;
block.style.marginLeft = "0";
})
}
But with siblings, there is a CSS-only solution.
We can use the Adjacent Sibling Selector combined with the :hover state selector and no JavaScript is needed, if we are just moving back and forth.
.button:hover+.block {
margin-left: 35px;
}
See the Snipped Below
* {
margin: 0;
padding: 0;
}
.button {
color: #000000;
text-decoration: none;
background-color: cyan;
margin: 0;
display: block;
width: 300px;
padding: 20px;
text-align: center;
}
.block {
width: 30px;
height: 30px;
background-color: green;
}
.button:hover+.block {
margin-left: 35px;
}
hover over me
<div class="block"></div>
hover over me
<div class="block"></div>
As Vecta mentioned, getElementsByClassName returns an array-like. You'll need to do something like this to get the first element:
function moveAlt() {
document.getElementsByClassName("block")[0].style.marginLeft = "35px";
}
function moveBackAlt() {
document.getElementsByClassName("block")[0].style.marginLeft = "0px";
}
However a better solution might be to use document.querySelector, which operates similarly to jQuery's $() syntax:
function moveAlt() {
document.querySelector(".block").style.marginLeft = "35px";
}
function moveBackAlt() {
document.querySelector(".block").style.marginLeft = "0px";
}
I'm using Polymer but I'm having some trouble with events and the such. I want to create an expanding search bar, similar to
My current code looks something like the following:
Code:
// This is where things are a little unclear for me. So far, I have tried the following:
expand: function() {
var divToStretch = this.$.stretchMe;
if ( /*search bar is open*/ ) {
//remove "stretched" css from "stretch" div
} else {
//add "stretched" css to "stretch" div
}
}
div.stretch {
border: 1px solid black;
width: 25px;
height: 25px;
border-radius: 25px;
transition: width 1s;
}
.stretched {
width: 500px;
}
<div class="stretch" id="stretchMe">
<iron-icon class="search" icon="search" on-click="expand"></iron-icon>
</div>
May I suggest a pure CSS alternative? You can make your search bar receive focus, by adding tabIndex="0". This way you can provide a style for div.stretch:focus, allowing you to dynamically change its size when the user clicks or focuses on the element and making it small again when the user focuses on something else.
It's really simple, elegant, does not need a lot of code and does what you need. Give it a try!
div.stretch {
border: 1px solid black;
width: 25px;
height: 25px;
border-radius: 25px;
transition: width 1s;
}
div.stretch:focus {
width: 500px;
}
<div class="stretch" id="stretchMe" tabIndex="0">
<iron-icon class="search" icon="search" on-click="expand"></iron-icon>
</div>
Alternatively, you can make it do the same thing on :hover, if that's what you are after, simply by changing the selector. Or combine both, if you prefer. Below is a :hover example.
div.stretch {
border: 1px solid black;
width: 25px;
height: 25px;
border-radius: 25px;
transition: width 1s;
}
div.stretch:hover {
width: 500px;
}
<div class="stretch" id="stretchMe">
<iron-icon class="search" icon="search" on-click="expand"></iron-icon>
</div>
You can use the toggle method of the classList for this:
expand : function() {
this.$.stretchMe.classList.toggle('stretched');
}
The classic way would be as following:
if (/*search bar is open*/) {
divToStretch.style.width = "auto";
} else {
divToStretch.style.width = "500px";
}
But I highly recommend using this.$.stretchMe.classList.toggle('stretched');
Read more here