This article mainly talks about two underline animation effects. The first one is to expand the X-axis from the inside to the outside when hovering to achieve the animation effect. The second one is to automatically display left and right, from left to right. , or from right to left.
The main effect achieved is to use pseudo-class tags, hover, and transfromm trition to achieve animation effects.
The x-axis expands from the inside out
Use Bezier curve to realize the animation of horizontal lines. The specific code is as follows:
ul { display: flex; padding: 0; margin: 0; list-style-type: none; } ul:hover li:not(:hover) a { opacity: 0.2; } ul li { position: relative; padding: 30px 25px 30px 25px; cursor: pointer; } ul li::after { position: absolute; content: ""; top: 100%; left: 0; width: 100%; height: 2px; background: #3498db; transform: scaleX(0); transition: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1); } ul li:hover::after, ul li.active::after { transform: scaleX(1); }
(Recommended tutorial: CSS tutorial)
Left and right horizontal underline animation effects
Mainly use js to determine the position of the mouse when it is moved away , the left and right movement in and out display of the animation effect
js code is as follows:
document.querySelectorAll('a').forEach(elem => { elem.onmouseenter = elem.onmouseleave = e => { const tolerance = 5; const left = 0; const right = elem.clientWidth; let x = e.pageX - elem.offsetLeft; if (x - tolerance < left) x = left; if (x + tolerance > right) x = right; elem.style.setProperty('--x', `${x}px`); }; });
css The animation implementation of animation effect using pseudo-class tags
css code is as follows :
a { position: relative; font-weight: 600; text-decoration: none; color: rgba(0, 0, 0, 0.4); transition: color .3s ease; } a::after { --scale: 0; content: ''; position: absolute; left: 0; right: 0; top: 100%; height: 3px; background: #4c81c9; -webkit-transform: scaleX(var(--scale)); transform: scaleX(var(--scale)); -webkit-transform-origin: var(--x) 50%; transform-origin: var(--x) 50%; transition: -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1), -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); } a:hover { color: #4c81c9; } a:hover::after { --scale: 1; }
Related tutorial recommendations: css video tutorial
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