Question

当用户专注于输入时，我希望svg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

查看此 CodePen Demo 。您需要在 SVG之前移动输入，否则您将不得不使用一些JavaScript来执行此操作，因为CSS没有任何类型的“后视”选择器。即使General Sibling Combinator也只是在当前选择器目标之前。

如果您先移动输入，则可以执行以下操作：

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

如果你做想要保留当前结构，那么JavaScript看起来就像这个 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'; }

你可以看到它更加乏味！

css on focus改变了另一个div的造型

1 个答案: