.slider ::-webkit-slider-thumb在javascript中需要 [英] .slider::-webkit-slider-thumb needed in javascript

问题描述

我想制作一个可以在值更改时更改点大小的滑块. 因此，值1的大小为10px，值100的大小为100px.

I want to make a slider that changes the dot size when the value changes. So value 1 will be a size of 10px and value 100 will be size 100px.

如何使用javascript更改.slider ::-webkit-slider-thumb高度?

How am a able to change the .slider::-webkit-slider-thumb height with javascript?

var slider = document.getElementById("myRange");
var output = document.getElementById("demo");
output.innerHTML = slider.value;

slider.oninput = function() {
  output.innerHTML = this.value;
}

.slidecontainer {
  width: 100%;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 5px;
  background: #d3d3d3;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

<h1>Round Range Slider</h1>

<div class="" "slidecontainer">
  <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
  <p>Value: <span id="demo"></span></p>
</div>

我尝试过的=

document.getElementById("myRange").style.webkitTransform = "height: 100px";

推荐答案

好的，所以，在回答问题之前:

Okay, so, before answering the question:

::-webkit-slider-thumb是伪元素.这些元素不是 DOM 的一部分.因此，使用JavaScript更改它们可能会有点麻烦.

::-webkit-slider-thumb is a pseudo element. Those elements are not part of the DOM. Therefore, changing them in JavaScript can get a bit hacky.

一个正确的解决方案是用另一个元素完全替换拇指.

A proper solution would be completely replacing the thumb with another element.

现在回答这个问题:当滑块值更改时，可以将样式注入具有给定属性的<style>元素中.

Now to answer the question: You could inject styles into an <style> element with a given attribute when the slider value changes.

所以您将添加

<style data="test" type="text/css"></style>

到标题中，然后定位元素并像这样向其添加CSS:

to your header, then target the element and add CSS to it like that:

var style = document.querySelector('[data="test"]');
style.innerHTML = ".class { property: value; }";

与此结合，您在此链接上提供的 将是您的问题的解决方案.

This, combined with the code you provided at this link would be a solution to your problem.

演示:

var slider = document.getElementById("myRange");
var output = document.getElementById("demo");
var style = document.querySelector('[data="test"]');

setData(slider.value);

slider.oninput = function() {
    setData(this.value);
}

function setData(x){
    output.innerHTML = x;
    style.innerHTML = ".slider::-webkit-slider-thumb { width: " + x + "px !important; height: " + x + "px !important; }";
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}
.slider {
    margin-top: 40px;
    -webkit-appearance: none;
    width: 100%;
    height: 15px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
}

<style data="test" type="text/css"></style>

<input type="range" min="1" max="100" value="50" class="slider" id="myRange">
<p>Value: <span id="demo"></span></p>

也:你说

因此，值1的大小为10px，值100的大小为100px.

So value 1 will be a size of 10px and value 100 will be size 100px.

如果您希望值1到10之类的方法等于10像素，而值10以上的所有值都是以像素为单位的实际值，则可以更改行

If you want an approach like value 1 to 10 equals 10px and everything above value 10 is the actual value in pixels, you can change the line

style.innerHTML = "...";

到

style.innerHTML = ".slider::-webkit-slider-thumb { width: " + (x < 10 ? 10 : x)  + "px !important; height: " + (x < 10 ? 10 : x) + "px !important; }";

可以找到此版本的Live演示 这里

A Live demo of this version can be found HERE

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