Transferring variables from CSS or HTML to inline SVG

I want to create a unique SVG star rating component using a single SVG.

The shape consists of 5 stars filled with a horizontal gradient. Take a look at the following code snippet:

<svg width="68" height="11" viewBox="0 0 68 11">
  <linearGradient id="grad">
        <stop offset="70%" stop-color="tomato"/>
        <stop offset="70%" stop-color="grey"/>
   </linearGradient>
  <g fill="url(#grad)">
    <path d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/>
  </g>
</svg>

The star rating can be in decimals, not just full or half stars, such as 3.35.

My main challenge is how to define offset="70%" dynamically.

  • Is there a way to pass a percentage to SVG? (e.g., using currentColor to pass color from CSS)
  • Is it possible to apply a linear gradient without referencing it by url(#id)? I want to avoid generating unique IDs for each rating on the page.
  • Or maybe there's a way to fill a certain percentage of horizontal space just through CSS?
htmlcsssvg

Answer №1

You have the option of using your SVG as a background, giving you full control over the size:

.rating {
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="68" height="11" viewBox="0 0 68 11"><path fill="grey" d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/></svg>');
  width: 68px;
  height: 11px;
}

.rating:before {
  content: "";
  display: block;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="68" height="11" viewBox="0 0 68 11"><path fill="tomato" d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/></svg>');
  height: 100%;
  width: var(--p, 50%);
}
<div class="rating"></div>
<div class="rating" style="--p:20%"></div>
<div class="rating" style="--p:80%"></div>
<div class="rating" style="--p:100%"></div>

To ensure broader compatibility, you may opt to replace CSS variables with standard CSS:

.rating {
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="68" height="11" viewBox="0 0 68 11"><path fill="grey" d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/></svg>');
  width: 68px;
  height: 11px;
}

.rating > div {
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="68" height="11" viewBox="0 0 68 11"><path fill="tomato" d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/></svg>');
  height: 100%;
  width:50%;
}
<div class="rating"></div>
<div class="rating" ><div style="width:20%"></div></div>
<div class="rating" ><div style="width:80%"></div></div>
<div class="rating" ><div style="width:100%"></div></div>

Answer №2

To achieve this effect, you can utilize SVG clipping.

.rating {
  position: relative;
  height: 11px;
  width: 68px;
  background: grey;
  clip-path: url(#myClip);
}

.fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: tomato;
}
<svg width="68" height="11" viewBox="0 0 68 11">
  <defs>
    <clipPath id="myClip">
      <path d="M6 8.84L9.708 11l-.984-4.07L12 4.192l-4.314-.354L6 0 4.314 3.838 0 4.192 3.276 6.93 2.292 11zM20 8.84L23.708 11l-.984-4.07L26 4.192l-4.314-.354L20 0l-1.686 3.838L14 4.192l3.276 2.738-.984 4.07zM34 8.84L37.708 11l-.984-4.07L40 4.192l-4.314-.354L34 0l-1.686 3.838L28 4.192l3.276 2.738-.984 4.07zM48 8.84L51.708 11l-.984-4.07L54 4.192l-4.314-.354L48 0l-1.686 3.838L42 4.192l3.276 2.738-.984 4.07zM62 8.84L65.708 11l-.984-4.07L68 4.192l-4.314-.354L62 0l-1.686 3.838L56 4.192l3.276 2.738-.984 4.07z"/>
    </clipPath>
  </defs>
</svg>

<div class="rating">
  <div class="fill" style="width: 55%;"></div>
</div>
<div class="rating">
  <div class="fill" style="width: 80%;"></div>
</div>

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