javascript - 范围 slider - 如何在填充时更改刻度颜色？

Question

在这里查看我的代码: https://codepen.io/anon/pen/PMQKdp

我正在尝试在已填充时为刻度设置一种颜色，而在轨道尚未填充时使用不同颜色。

这可能吗？以图像为例: https://imgur.com/EHyZ3DB我希望它看起来如何:https://imgur.com/Ch8I982

https://codepen.io/anon/pen/PMQKdp

这就是我创建刻度的方式:

#tickmarks p {
    position: relative;
    display: flex;
    justify-content: center;
    text-align: center;
    width: 4px;
    height: 4px;
    background: green;
    color: green;
    border-radius: 100%;
    line-height: 54px;
    top: -34px;
    left: 3px;
    z-index: 0;
}

Answer 1

您可以将您的 _R.value 与您的 html 的所有 p 元素的每个 innerHTML 属性进行比较，如下所示:

const _R = document.querySelector('[type=range]');
_R.style.setProperty('--val', +_R.value);
_R.style.setProperty('--max', +_R.max);
_R.style.setProperty('--min', +_R.min);

document.documentElement.classList.add('js');

_R.addEventListener('input', e => {
  handleColors();
  _R.style.setProperty('--val', +_R.value);
}, false);

function handleColors() {
    var ticks = document.getElementsByTagName("p");
  for(let i = 0; i < ticks.length; i++) {
    if(parseFloat(ticks[i].innerHTML) < _R.value) {
      ticks[i].style.background = 'blue';
      ticks[i].style.color = 'blue';
    } else {
      ticks[i].style.background = 'green';
      ticks[i].style.color = 'green';

    }
  }
}

handleColors();

input:focus{
        outline: none;
    }
    .slider {
        -webkit-appearance: none;
        --range: calc(var(--max) - var(--min));
        --ratio: calc((var(--val) - var(--min))/var(--range));
        --sx: calc(.5*1.5em + var(--ratio)*(100% - 1.5em));
        margin: 0;
        padding: 0;
        width: 100%;
        height: 1.5em;
        background: transparent;
        font: 1em/1 arial, sans-serif;
        border: none;
    }
    .slider, .slider::-webkit-slider-thumb {
        -webkit-appearance: none;
    }
    .slider::-webkit-slider-runnable-track {
        box-sizing: border-box;
        border: none;
        width: 12.5em;
        height: 0.5em;
        background: #ccc;
    }
    .js .slider::-webkit-slider-runnable-track {
        background: linear-gradient(#7b1c1a, #7b1c1a) 0/var(--sx) 100% no-repeat #ccc;
    }
    .slider::-moz-range-track {
        box-sizing: border-box;
        border: none;
        height: 0.5em;
        background: #ccc;
    }
    .slider::-ms-track {
        box-sizing: border-box;
        border: none;
        width: 12.5em;
        height: 0.5em;
        background: #ccc;
    }
    .slider::-moz-range-progress {
        height: 0.5em;
        background: #7b1c1a;
    }
    .slider::-ms-fill-lower {
        height: 0.5em;
        background: #7b1c1a;
    }
    .slider::-webkit-slider-thumb {
        position: relative;
        z-index: 99;
        margin-top: -0.550em;
        box-sizing: border-box;
        border: none;
        width: 1.5em;
        height: 1.5em;
        border-radius: 50%;
        background: #7b1c1a;
    }
    .slider::-moz-range-thumb {
        position: relative;
        z-index: 99;
        box-sizing: border-box;
        border: none;
        width: 1.5em;
        height: 1.5em;
        border-radius: 50%;
        background: #7b1c1a;
    }
    .slider::-ms-thumb {
        position: relative;
        z-index: 99;
        margin-top: 0;
        box-sizing: border-box;
        border: none;
        width: 1.5em;
        height: 1.5em;
        border-radius: 50%;
        background: #7b1c1a;
    }
    .slider::-ms-tooltip {
        display: none;
    }
    #tickmarks {
        display: flex;
        justify-content: space-between;
        padding: 0 10px;
    }

    #tickmarks p {
        position: relative;
        display: flex;
        justify-content: center;
        text-align: center;
        width: 4px;
        height: 4px;
        background: green;
        color: green;
        border-radius: 100%;
        line-height: 54px;
        top: -34px;
        left: 3px;
        z-index: 0;
    }

<div class="slidecontainer">
    <input type="range" min="5" max="20" value="10" step='2.5' class="slider" id="myRange" list='tickmarks'>
    <div id="tickmarks">
        <p>5</p>
        <p>7.5</p>
        <p>10</p>
        <p>12.5</p>
        <p>15</p>
        <p>17.5</p>
        <p>20</p>
    </div>
</div>