A Pen by Bryan C Guner on CodePen.
Created
August 15, 2022 18:30
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Dashed Border Generator
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| <div class="content"> | |
| <h2>Dashed border using <span>background-image</span> property</h2> | |
| <p> | |
| Creating dashed borders with background-image is not a new concept. Many people use it because it allows full flexibility, and with a little creativity (and a few lines of code) it is possible to do cool things without it being too complicated. | |
| </p> | |
| <div class="boxes"> | |
| <div class="box box-a">Simple</div> | |
| <div class="box box-b">Slanted</div> | |
| <div class="box box-c">Dotted</div> | |
| <div class="box box-d">Long</div> | |
| <div class="box box-e">Cornered</div> | |
| <div class="box box-f">Centered</div> | |
| <div class="box box-g">Faded</div> | |
| <div class="box box-h">Animated</div> | |
| </div> | |
| <hr> | |
| <h2>Create your own <span>background-image</span> border</h2> | |
| <div class="generator"> | |
| <form> | |
| <Label> | |
| Border width | |
| <input name="borderWidth" type="range" class="input" min="1" max="10" value="3"> | |
| </Label> | |
| <Label> | |
| Border color<br> | |
| <input name="borderColor" type="color" class="input" value="#333333"> | |
| </Label> | |
| <Label> | |
| Dash length | |
| <input name="dashLength" type="range" class="input" min="1" max="30" value="10"> | |
| </Label> | |
| <Label> | |
| Spacing | |
| <input name="spacing" type="range" class="input" min="1" max="30" value="10"> | |
| </Label> | |
| <Label> | |
| Slanting angle | |
| <input name="slanting" type="range" class="input" min="-60" max="60" value="0"> | |
| </Label> | |
| <Label> | |
| Fade | |
| <input name="borderFade" type="range" class="input" min="0" max="100" value="0"> | |
| </Label> | |
| <Label> | |
| <input name="diraction" type="checkbox"> | |
| Flip diraction | |
| </Label> | |
| <Label> | |
| Animation | |
| <input name="animation" type="range" class="input" min="0" max="1" step="0.1" value="0"> | |
| </Label> | |
| </form> | |
| <div class="result"></div> | |
| </div> | |
| </div> | |
| <a href="https://twitter.com/bgooonz" class="twitterLink" target="_blank"> | |
| <img src="https://assets.codepen.io/1948355/twitterLogo2.png" /> | |
| </a> |
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| function _(e, all=false) { | |
| let divs = document.querySelectorAll(e); | |
| if (all || (divs.length > 1)) { return divs; } | |
| return divs[0]; | |
| } | |
| _('input', true).forEach(element => { | |
| element.addEventListener('input', drawBordr); | |
| }); | |
| const resultDiv = _('.result'); | |
| drawBordr(); | |
| function drawBordr() { | |
| let borderWidth = Number(_('[name="borderWidth"]').value); | |
| let color1 = _('[name="borderColor"]').value; | |
| let dashLength = Number(_('[name="dashLength"]').value); | |
| let spacing = Number(_('[name="spacing"]').value); | |
| let slanting = Number(_('[name="slanting"]').value); | |
| let borderFade = 100 - Number(_('[name="borderFade"]').value); | |
| let diraction = _('[name="diraction"]').checked; | |
| let animation = Number(_('[name="animation"]').value); | |
| let color2 = 'transparent'; | |
| const backgroundImage = ` | |
| repeating-linear-gradient(${slanting + (diraction ? 180 : 0) }deg, ${color1}, ${color1} ${Math.round(dashLength * borderFade) / 100}px, ${color2} ${dashLength}px, ${color2} ${dashLength + (Math.round(spacing * borderFade) / 100)}px, ${color1} ${dashLength + spacing}px), | |
| repeating-linear-gradient(${slanting + (diraction ? 270 : 90)}deg, ${color1}, ${color1} ${Math.round(dashLength * borderFade) / 100}px, ${color2} ${dashLength}px, ${color2} ${dashLength + (Math.round(spacing * borderFade) / 100)}px, ${color1} ${dashLength + spacing}px), | |
| repeating-linear-gradient(${slanting + (diraction ? 0 : 180) }deg, ${color1}, ${color1} ${Math.round(dashLength * borderFade) / 100}px, ${color2} ${dashLength}px, ${color2} ${dashLength + (Math.round(spacing * borderFade) / 100)}px, ${color1} ${dashLength + spacing}px), | |
| repeating-linear-gradient(${slanting + (diraction ? 90 : 270)}deg, ${color1}, ${color1} ${Math.round(dashLength * borderFade) / 100}px, ${color2} ${dashLength}px, ${color2} ${dashLength + (Math.round(spacing * borderFade) / 100)}px, ${color1} ${dashLength + spacing}px)`; | |
| const borderLengthPx = Math.round((dashLength + spacing) / Math.sin((90 - Math.abs(slanting)) * Math.PI / 180) * 100) / 100; | |
| const borderLength = (animation > 0) ? `calc(100% + ${borderLengthPx}px)` : '100%'; | |
| const backgroundSize = `${borderWidth}px ${borderLength}, ${borderLength} ${borderWidth}px, ${borderWidth}px ${borderLength} , ${borderLength} ${borderWidth}px`; | |
| const backgroundPosition = `0 0, 0 0, 100% 0, 0 100%`; | |
| resultDiv.style.backgroundImage = backgroundImage; | |
| resultDiv.style.backgroundSize = backgroundSize; | |
| resultDiv.style.backgroundPosition = backgroundPosition; | |
| const animationPropery = (animation > 0) ? `borderAnimation ${Math.round((1.1 - animation) * 10) / 10}s infinite linear${diraction ? ' reverse' : ''}` : 'unset'; | |
| resultDiv.style.animation = animationPropery; | |
| let animationTxt = ''; | |
| if (animation > 0) { | |
| document.documentElement.style.setProperty('--AnimationLength', `-${borderLengthPx}px`); | |
| animationTxt = ` | |
| <span><b>animation:</b> ${animationPropery};</span> | |
| }<br> | |
| <br> | |
| @keyframes <b>borderAnimation</b> { | |
| <span>from { background-position: 0 0, -${borderLengthPx}px 0, 100% -${borderLengthPx}px, 0 100%; }</span> | |
| <span>to { background-position: 0 -${borderLengthPx}px, 0 0, 100% 0, -${borderLengthPx}px 100%; }</span> | |
| `; | |
| } | |
| resultDiv.style.padding = `calc(1em + ${borderWidth}px)`; | |
| resultDiv.innerHTML = ` | |
| <code> | |
| .box { | |
| <span><b>background-image:</b> ${backgroundImage};</span> | |
| <span><b>background-size:</b> ${backgroundSize};</span> | |
| <span><b>background-position:</b> ${backgroundPosition};</span> | |
| <span><b>background-repeat:</b> no-repeat; </span> | |
| ${animationTxt} | |
| } | |
| </code> | |
| `; | |
| } |
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| @import url('https://fonts.googleapis.com/css2?family=Open+Sans+Condensed:wght@300;700&display=swap'); | |
| *, *::before, *::after { | |
| padding: 0; | |
| margin: 0 auto; | |
| box-sizing: border-box; | |
| } | |
| body { | |
| font-family: 'Open Sans Condensed', sans-serif; | |
| min-height: 100vh; | |
| background-color: #eee; | |
| background-size: 10px 10px; | |
| background-image: | |
| radial-gradient(circle at 50% 50%, #ddd, #ddd 1px, transparent 1px), | |
| radial-gradient(circle at 0 0, #ddd, #ddd 1px, transparent 1px), | |
| radial-gradient(circle at 0 100%, #ddd, #ddd 1px, transparent 1px), | |
| radial-gradient(circle at 100% 0, #ddd, #ddd 1px, transparent 1px), | |
| radial-gradient(circle at 100% 100%, #ddd, #ddd 1px, transparent 1px); | |
| color: #333; | |
| } | |
| :root { | |
| --clr-border: #333; | |
| --AnimationLength: 0px; | |
| } | |
| .content { | |
| width: 100%; max-width: 960px; | |
| padding: 2em 2em 10em; | |
| } | |
| h2 { | |
| margin: 1em auto; | |
| text-decoration: underline; | |
| text-decoration-color: #aaa; | |
| & span { | |
| color: #777; | |
| } | |
| } | |
| p { | |
| margin: 2em auto; | |
| font-weight: bold; | |
| } | |
| hr { | |
| height: 3px; | |
| border: none; | |
| margin: 4em auto; | |
| background-color: #aaa; | |
| } | |
| .boxes { | |
| width: 100%; | |
| display: grid; | |
| grid-gap: 2em; | |
| grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); | |
| } | |
| .box { | |
| display: flex; | |
| justify-content: center; | |
| align-items: center; | |
| width: 100%; height: 123px; | |
| font-size: 2em; | |
| padding: 0.5em; | |
| line-height: 1; | |
| background-position: 0 0, 0 0, 100% 0, 0 100%; | |
| background-size: 3px 100%, 100% 3px, 3px 100% , 100% 3px; | |
| background-repeat: no-repeat; | |
| } | |
| .box-a { // Simple | |
| background-image: | |
| repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // left | |
| repeating-linear-gradient(90deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // top | |
| repeating-linear-gradient(180deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // right | |
| repeating-linear-gradient(270deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px) // bottom | |
| ; | |
| border-image: repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px); | |
| } | |
| .box-b { // Slanted | |
| background-image: | |
| repeating-linear-gradient(45deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // left | |
| repeating-linear-gradient(135deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // top | |
| repeating-linear-gradient(225deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // right | |
| repeating-linear-gradient(315deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px) // bottom | |
| ; | |
| } | |
| .box-c { // Dotted | |
| background-image: | |
| repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 3px, transparent 3px, transparent 6px), // left | |
| repeating-linear-gradient(90deg, var(--clr-border), var(--clr-border) 3px, transparent 3px, transparent 6px), // top | |
| repeating-linear-gradient(180deg, var(--clr-border), var(--clr-border) 3px, transparent 3px, transparent 6px), // right | |
| repeating-linear-gradient(270deg, var(--clr-border), var(--clr-border) 3px, transparent 3px, transparent 6px) // bottom | |
| ; | |
| } | |
| .box-d { // Long | |
| background-image: | |
| repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 30px, transparent 30px, transparent 36px), // left | |
| repeating-linear-gradient(90deg, var(--clr-border), var(--clr-border) 30px, transparent 30px, transparent 36px), // top | |
| repeating-linear-gradient(180deg, var(--clr-border), var(--clr-border) 30px, transparent 30px, transparent 36px), // right | |
| repeating-linear-gradient(270deg, var(--clr-border), var(--clr-border) 30px, transparent 30px, transparent 36px) // bottom | |
| ; | |
| } | |
| .box-e { // Cornered | |
| background-image: | |
| linear-gradient(0deg, var(--clr-border), var(--clr-border) 25%, transparent 25%, transparent 75%, var(--clr-border) 75%), // left | |
| linear-gradient(90deg, var(--clr-border), var(--clr-border) 25%, transparent 25%, transparent 75%, var(--clr-border) 75%), // top | |
| linear-gradient(180deg, var(--clr-border), var(--clr-border) 25%, transparent 25%, transparent 75%, var(--clr-border) 75%), // right | |
| linear-gradient(270deg, var(--clr-border), var(--clr-border) 25%, transparent 25%, transparent 75%, var(--clr-border) 75%) // bottom | |
| ; | |
| } | |
| .box-f { // Centered | |
| background-image: | |
| linear-gradient(0deg, transparent 15%, var(--clr-border) 15%, var(--clr-border) 85%, transparent 85%), // left | |
| linear-gradient(90deg, transparent 15%, var(--clr-border) 15%, var(--clr-border) 85%, transparent 85%), // top | |
| linear-gradient(180deg, transparent 15%, var(--clr-border) 15%, var(--clr-border) 85%, transparent 85%), // right | |
| linear-gradient(270deg, transparent 15%, var(--clr-border) 15%, var(--clr-border) 85%, transparent 85%) // bottom | |
| ; | |
| } | |
| .box-g { // Faded | |
| background-image: | |
| repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 10px, transparent 20px, transparent 30px, var(--clr-border) 40px), // left | |
| repeating-linear-gradient(90deg, var(--clr-border), var(--clr-border) 10px, transparent 20px, transparent 30px, var(--clr-border) 40px), // top | |
| repeating-linear-gradient(180deg, var(--clr-border), var(--clr-border) 10px, transparent 20px, transparent 30px, var(--clr-border) 40px), // right | |
| repeating-linear-gradient(270deg, var(--clr-border), var(--clr-border) 10px, transparent 20px, transparent 30px, var(--clr-border) 40px) // bottom | |
| ; | |
| } | |
| .box-h { // Animated | |
| background-image: | |
| repeating-linear-gradient(0deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // left | |
| repeating-linear-gradient(90deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // top | |
| repeating-linear-gradient(180deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px), // right | |
| repeating-linear-gradient(270deg, var(--clr-border), var(--clr-border) 10px, transparent 10px, transparent 20px) // bottom | |
| ; | |
| background-size: 3px calc(100% + 20px), calc(100% + 20px) 3px, 3px calc(100% + 20px) , calc(100% + 20px) 3px; | |
| animation: boxBorderAnimation 1s infinite linear; | |
| @keyframes boxBorderAnimation { | |
| from { background-position: 0 0, -20px 0, 100% -20px, 0 100%; } | |
| to { background-position: 0 -20px, 0 0, 100% 0, -20px 100%; } | |
| } | |
| } | |
| // Generator: | |
| .generator { | |
| display: grid; | |
| grid-template-columns: repeat(2, 1fr); | |
| grid-gap: 3em; | |
| @media (max-width: 768px) { | |
| grid-template-columns: 1fr; | |
| } | |
| } | |
| form { | |
| width: 100%; | |
| label { | |
| display: block; | |
| font-weight: bold; | |
| width: 100%; | |
| & + label { | |
| margin-top: 1.5em; | |
| } | |
| } | |
| .input { | |
| display: block; | |
| width: 100%; | |
| } | |
| } | |
| .result { | |
| width: 100%; | |
| height: 100%; | |
| padding: 1em; | |
| line-height: 1.2; | |
| background-repeat: no-repeat; | |
| span { | |
| display: block; | |
| padding-left: 4em; | |
| text-indent: -2em; | |
| margin: 0.5em auto; | |
| } | |
| @keyframes borderAnimation { | |
| from { background-position: 0 0, var(--AnimationLength) 0, 100% var(--AnimationLength), 0 100%; } | |
| to { background-position: 0 var(--AnimationLength), 0 0, 100% 0, var(--AnimationLength) 100%; } | |
| } | |
| } | |
| .twitterLink { | |
| position: fixed; | |
| bottom: 0.5em; right: 0.5em; | |
| & img { | |
| width: 2em; | |
| filter: grayscale(100%); | |
| transition: filter 0.25s; | |
| &:hover { | |
| filter: grayscale(0%); | |
| } | |
| } | |
| } |
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