专注于元素会改变他人的CSS [英] focusing on an element changes another's CSS

问题描述

当我关注另一个元素Hdr_nav_search_input时，我想更改元素的颜色Hdr_nav_search_box.以下是代码: http://jsfiddle.net/FJAYk/4/我不明白为什么这不起作用.

I want to change an element's color Hdr_nav_search_box when focusing on another element Hdr_nav_search_input. Here are the codes : http://jsfiddle.net/FJAYk/4/ I don not see why this is not working.

<input class="Hdr_nav_search_input" />
<div class="Hdr_nav_search_box" /><span>search for location....</span><i>for example: blah blah</i></div>

-

.Hdr_nav_search_box{
padding: 0 5px;
margin: 7.5px 0;
width:300px;
height: 25px;
background: white;
 }
.Hdr_nav_search_input:focus .Hdr_nav_search_box{
color: #d4d4d4;
 }
.Hdr_nav_search_box span,.Hdr_nav_search_box i{
line-height: 25px;
color: gray;
}
.Hdr_nav_search_input{
padding: 0 5px;
margin: 7.5px 0;
border: 0;
z-index: 2;
position: absolute;
width:300px;
height: 25px;
background: transparent;    
}

推荐答案

您的样式存在一些问题.首先，您针对框的选择器不太正确.

There were a few problems with your styles. Firstly your selector to target the box isn't quite right.

.Hdr_nav_search_input:focus .Hdr_nav_search_box

这是在选择所有.Hdr_nav_search_box属于.Hdr_nav_search_input的子孙的情况下应用的.它实际上是一个兄弟姐妹，因此您想使用下一个兄弟姐妹选择器+:

That is applying selecting all .Hdr_nav_search_box where they are a descendant of .Hdr_nav_search_input. It's actually a sibling so you want to use the next sibling selector +:

.Hdr_nav_search_input:focus + .Hdr_nav_search_box

---

第二，如果选择器有效，它将覆盖您的颜色更改.

---

Secondly this selector would be overriding your colour change if it was working.

.Hdr_nav_search_box span,.Hdr_nav_search_box i{
    ...
}

您可以简单地使用

.Hdr_nav_search_box {
    ...
}

---

这是一个演示，我进行了样式更改以使其正常工作.

---

Here is a demo and the style changes I made to get it working.

jsFiddle

.Hdr_nav_search_input:focus + .Hdr_nav_search_box {
    color: #F00;
 }
.Hdr_nav_search_box {
    line-height: 25px;
    color: gray;
}

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