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Detailed explanation of the use of hover selector in CSS

小云云Original: 2017-12-05 13:20:242852browse

Sometimes you need to use the two mouse events mouseover and mouseout, but writing js is more troublesome, and you have to add listening events, so things that can be solved with css should be solved with css as much as possible, which can improve performance. Let me talk about it below. Understanding of :hover:

When we were learning computer applications, the teacher taught us to use the :hover selector to complete the drop-down menu. Before, I only knew how to use it, but I didn’t know why it was used in this way. Now write down how to use it

Definition and usage

Definition:

:hover selector is used to select the element on which the mouse pointer is floating.

:hover selector applies to all elements

Usage 1:

This means: when the mouse is hovering over the style a, the background color of a is set For yellow

a:hover
    { 
        background-color:yellow;
    }

This is the most common usage, it just changes the style through a

Usage 2:

Use a to control the style of other blocks:

Use a to control the sub-element b of a:

    .a:hover .b {
            background-color:blue;
        }

Use a to control a's sibling element c (sibling element):

    .a:hover + .c {
            color:red;
        }

Use a controls the nearest element d of a:

    .a:hover ~ .d {
            color:pink;
        }

##To summarize:

1. Add nothing in the middle to control child elements;

2. '+' controls sibling elements (sibling elements);
3. '～' controls nearby elements;

Example

Use a button to control the movement state of a box. When the mouse moves over the button, the box stops moving. When the mouse moves away, the box continues to move.

body code:

    <body>
        <p class="btn stop">stop</p>
        <p class="animation"></p>
    </body>

css style:

    <style>
        .animation {
            width: 100px;
            height: 100px;
            background-color: pink;
            margin: 100px auto;
            animation: move 2s infinite alternate;
            -webkit-animation: move 2s infinite alternate;
        }
        @keyframes move {
            0% {
                transform: translate(-100px, 0);
            }
            100% {
                transform: translate(100px, 0);
            }
        }
        .btn {
            padding: 20px 50px;
            background-color: pink;
            color: white;
            display: inline-block;
        }
        .stop:hover ~ .animation {
            -webkit-animation-play-state: paused;
            animation-play-state: paused;
        }
    </style>

implementation Effect:

Related recommendations:

How to use the color animation of hover animation in Css3

Examples of using hover pseudo-classes in CSS

Sample code of how CSS implements hover dynamic effects

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