css 专注于更改另一个 div 的样式

Question

我希望 svg 在用户将焦点放在输入上时更改填充颜色。但我不明白如何编写 css 来实现它。添加了 Html 和 css 供您查看！我正在使用 scss 作为 css.

<div class="search">
    <svg width="20px" height="20px" viewBox="0 0 88 88" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
        <g id="Symbols" stroke="none" stroke-width="1" fill-rule="evenodd">
            <g id="Icon-Search" fill="#b3b3b3" fill-rule="nonzero">
                <path d="M86.829,81.172 L64.128,58.471 C69.055,52.312 72,44.5 72,36 C72,16.118 55.883,0 36,0 C16.118,0 0,16.118 0,36 C0,55.882 16.118,72 36,72 C44.5,72 52.312,69.054 58.471,64.127 L81.172,86.828 C81.953,87.609 82.977,88 84,88 C85.024,88 86.048,87.609 86.829,86.828 C88.391,85.267 88.391,82.733 86.829,81.172 Z M36,64 C20.536,64 8,51.464 8,36 C8,20.536 20.536,8 36,8 C51.465,8 64,20.536 64,36 C64,51.464 51.465,64 36,64 Z" id="Shape"></path>
            </g>
         </g>
      </svg>

      <input class="input inputSearchField" type="text" placeholder="Search...">
  </div> 



.input{
    width: 250px;
    height: 35px;
    padding-left: 16px;
    font-weight: 700;
    background-color: $white-color;
    border-radius: 4px;
    border: 1px solid $lighter-gray;
    font-size: 16px;
    outline:none;
    transition: all 0.30s ease-in-out;
    &::placeholder {
        color: $light-gray;
    }
    &:focus {
        box-shadow: 0 0 5px #64e469;
        border: 1px solid #64e469;
    }
}
.search { 
    position: relative;
    margin: 0 auto;
    text-align: center;
    width: 270px;
    margin-bottom: 30px;
  }
  .search svg { 
    position: absolute;
    top: 7px;
    right: 22px;
    fill: $lighter-gray;
  }

Answer 1

我想知道你有一个 html 喜欢它：

<div class="search">
  <input class="input" />
  <svg />
</div>

你的css可以是这样的：

.input:focus + svg { ... }

如果svg出现在input之前，那么您可以使用~代替+

Answer 2

查看此 CodePen Demo. You'll need to move your input before your SVG, otherwise you'll have to use some JavaScript to do this, because CSS doesn't have a "look behind" selector of any kind. Even the General Sibling Combinator 仅查看当前选择器目标。

如果你先移动输入，你可以这样做：

.input:focus + svg #Icon-Search {
  fill: #64e469;
}

如果您想保留当前结构，JavaScript 看起来像 Demo

let search  = document.getElementsByClassName('inputSearchField');
let svgFill = document.getElementById('Icon-Search');

search[0].onfocus = function(){ svgFill.style.fill = '#64e469'; }
search[0].onblur  = function(){ svgFill.style.fill = '#b3b3b3'; }

你可以看到它有点乏味！

css 专注于更改另一个 div 的样式

css on focus change another div's styling

html

css

svg

focus

sass