如何使用CSS創建圓形進度欄？
使用HTML創建基礎結構，通過自定義屬性--progress設置進度值；2. 利用CSS的conic-gradient根據--progress生成彩色扇形背景；3. 通過偽元素::before配合inset和border-radius裁剪出中心區域，形成環形；4. 可選添加帶樣式的span標籤作為中心文字標籤；5. 整體通過flex佈局居中內容，實現一個純CSS的圓形進度條，最終效果為一個75%綠色填充、25%灰色剩餘的環形進度條，且可通過JavaScript動態更新進度值並實現動畫效果。
Creating a circular progress bar with CSS involves combining HTML structure and CSS styling, often using CSS conic-gradient , clip-path , or pseudo-elements with border-radius tricks. One of the most modern and flexible approaches uses conic-gradient and background properties. Here's how to do it step by step.
1. Basic Structure with HTML
Start with a simple container element that will represent the circle:
<div class="circular-progress" style="--progress: 75;"></div>
Here, we're using a custom CSS property --progress to control the fill level (75% in this case).
2. Styling the Circle with CSS
Use CSS to create the circular shape and apply the gradient based on the progress value.
.circular-progress {
width: 120px;
height: 120px;
border-radius: 50%;
background:
conic-gradient(
#4caf50 var(--progress),
#e0e0e0 var(--progress)
);
position: relative;
} This creates a pie-chart-like effect where the green color ( #4caf50 ) fills up to the percentage defined by --progress , and the rest is gray ( #e0e0e0 ).
But this fills the entire circle. To make it look like a ring , we need to mask the center.
3. Creating the Hollow Center (Ring Effect)
Use a pseudo-element or a clip-path to cut out the center and form a ring.
Option A: Using clip-path (Simpler)
.circular-progress {
width: 120px;
height: 120px;
border-radius: 50%;
background:
conic-gradient(
#4caf50 calc(var(--progress) * 1%),
#e0e0e0 calc(var(--progress) * 1%)
);
clip-path: inset(15px);
} clip-path: inset(15px) removes a margin from all sides, creating a ring. But this isn't perfectly centered or scalable.
Option B: Using a Pseudo-element (Recommended)
.circular-progress {
width: 120px;
height: 120px;
border-radius: 50%;
background:
conic-gradient(
#4caf50 calc(var(--progress) * 1%),
#e0e0e0 calc(var(--progress) * 1%)
);
position: relative;
}
.circular-progress::before {
content: '';
position: absolute;
inset: 15px; /* Controls thickness of the ring */
background: #fff; /* This masks the center */
border-radius: 50%;
} This method gives a clean ring. The inset: 15px creates a smaller circle inside, revealing only the outer ring.
4. Adding a Label (Optional)
You can add a text label in the center using another pseudo-element or a child element.
<div class="circular-progress" style="--progress: 60"> <span class="label">60%</span> </div>
.label {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
font-family: Arial, sans-serif;
font-size: 18px;
font-weight: bold;
color: #333;
} Make sure the parent has position: relative .
5. Full Working Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Circular Progress Bar</title>
<style>
.circular-progress {
width: 120px;
height: 120px;
border-radius: 50%;
background: conic-gradient(
#4caf50 calc(var(--progress) * 1%),
#e0e0e0 calc(var(--progress) * 1%)
);
position: relative;
display: flex;
justify-content: center;
align-items: center;
}
.circular-progress::before {
content: '';
position: absolute;
inset: 15px;
background: #fff;
border-radius: 50%;
}
.label {
font-family: Arial, sans-serif;
font-size: 18px;
font-weight: bold;
color: #333;
z-index: 1;
}
</style>
</head>
<body>
<div class="circular-progress" style="--progress: 75">
<span class="label">75%</span>
</div>
</body>
</html>Important Notes
- The
conic-gradientmethod is not supported in older browsers like Internet Explorer. - For dynamic updates, you can change
--progressvia JavaScript:document.querySelector('.circular-progress').style.setProperty('--progress', 90);
- To animate the progress, use CSS transitions on
--progress— but note: CSS doesn't animate custom properties directly. You'll need a workaround using@property(experimental) or JavaScript animation.
Alternative: Stroke-based (SVG) Method
While this question was about pure CSS, many developers use SVG for more control and animation support. But for a pure CSS solution , the conic-gradient pseudo-element method is clean and effective.
That's it. You now have a responsive, customizable circular progress bar using only HTML and CSS. Basically just a clever use of gradients and masking.
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