Line Numbers for <textarea> using SVG-CSS Tutorial-php.cn

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                <h1 class="wzctTitle">Line Numbers for <textarea> using SVG</h1>
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                    <p>The other day I was working on a JSON Schema Generator, and wanted to display line numbers in a <textarea>. Nothing fancy, and not considering soft line-breaks or anything remotely complicated.</p>

<p>I did some research, and found multiple approaches:</p>

<ol>
<li>Using a background-image (TinyMCE does that, using a PNG)</li>
<li>Using an <ol> ordered list. </li>
</ol>

<p>I did not like any of them! The first one didn't look crisp — and didn't match the styles I already had in place for my <textarea>-elements.</p>

<p>The second one required a bunch of JavaScript to maintain that ordered list: adding/removing <li>-elements dynamically, syncing scroll-events and much more.</p>

<p>So I ended up creating a hybrid. </p>

<p>It's a dynamically generated SVG, stored as a <em>CSS Custom Property</em> — and used as a background-image, inheriting the styles from it's parent <textarea>-element.</p>

<p><img src="https://img.php.cn/upload/article/000/000/000/172406361393154.png" alt="Line Numbers for <textarea> using SVG"></p>

<hr>

<h2>
  
  
  JavaScript
</h2>

<p>First, the main method:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">lineNumbers(element, numLines = 50, inline = false)
</pre><div class="contentsignin">Copy after login</div></div>

<p>element is the <textarea> element to use, numLines the number of lines to render, and inline indicates whether to store the generated image on element (true), or on document.body (false).</p>

<p>Next, we define a prefix for the custom property:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const prefix = '--linenum-';
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<p>Before we continue, we check whether to re-use any existing property:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">if (!inline) {
  const styleString = document.body.getAttribute('style') || '';
  const regex = new RegExp(`${prefix}[^:]*`, 'g');
  const match = styleString.match(regex);

if (match) {
    element.style.backgroundImage = `var(${match[0]})`;
    return;
  }
}
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<p>Next, we <strong>extract</strong> styles from element, rendering the SVG with the same font-family, font-size, line-height etc. :<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const bgColor = getComputedStyle(element).borderColor;
const fillColor = getComputedStyle(element).color;
const fontFamily = getComputedStyle(element).fontFamily;
const fontSize = parseFloat(getComputedStyle(element).fontSize);
const lineHeight = parseFloat(getComputedStyle(element).lineHeight) / fontSize;
const paddingTop = parseFloat(getComputedStyle(element).paddingTop) / 2;
const translateY = (fontSize * lineHeight).toFixed(2);
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<p>We need a random id for our property as well:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const id = `${prefix}${Math.random().toString(36).substr(2, 6)}`;
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<p>And now it's time to render the SVG:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const svg = `<svg xmlns="http://www.w3.org/2000/svg">
  <style>
    svg { background: ${bgColor}; }
    text {
      fill: hsl(from ${fillColor} h s l / 50%);
      font-family: ${fontFamily};
      font-size: ${fontSize}px;
      line-height: ${lineHeight};
      text-anchor: end;
      translate: 0 calc((var(--n) * ${translateY}px) + ${paddingTop}px);
    }
  </style>
  ${Array.from({ length: numLines }, (_, i) => `<text x="90%" style="--n:${i + 1};">${i + 1}</text>`).join("")}
</svg>`;
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<p><strong>Let's break it down:</strong></p>

<p>In the <style>-section we simply set the styles we extracted from the <textarea> earlier. Instead of using y and dy attributes for the <text>-elements, we simply use a --n-property to translate the text-elements using CSS.</p>

<p>The last part iterates an array created from numLines, and appends the <text>-elements to the main SVG.</p>

<p>We're almost there!</p>

<hr>

<p>To use the generated SVG as a url()-property, we need to <strong>encode</strong> it:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const encodedURI = `url("data:image/svg+xml,${encodeURIComponent(svg)}")`;
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<p>And finally, we set that property on either element or document-body:<br>
</p>

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const target = inline ? element : document.body;
target.style.setProperty(id, encodedURI);
element.style.backgroundImage = `var(${id})`;
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<p>Not too bad, and only 610 bytes, minified and compressed!</p>

<hr>

<p>You can see a demo here, and dowload the full script here.</p>

<p>Below is a simplified Codepen, not using the inline-property logic:</p>

<hr>

<p>Are there pros and cons? Of course there are! </p>

<p>Personally — for my current project — I needed a simple, crisp way of adding line numbers to a JSON-preview within a <textarea>, and this method fits the bill.</p>

<h4>
  
  
  Reduced DOM Manipulation
</h4>

<p>This method does not rely on manipulating the DOM. The line numbers are generated as a single SVG, stored within a CSS Custom Property.</p>

<h4>
  
  
  Automatic Synchronization
</h4>

<p>Since the line numbers are part of the background image, they automatically scroll with the text content, eliminating the need for manual synchronization logic.</p>

<h4>
  
  
  Reusability Across Elements
</h4>

<p>By storing the generated SVG in a CSS Custom Property, it can be reused across multiple elements. This means that if several elements require the same line numbers, they can all reference the same custom property, avoiding redundant SVG generation.</p>

<h4>
  
  
  Scalability
</h4>

<h2>
  
  
  The vector nature of SVG ensures that the line numbers remain crisp and clear at any zoom level.
</h2>

<h4>
  
  
  Accessibility
</h4>

<p>Ordered lists are more accessible to screen readers and assistive technologies, while SVG-based line numbers might be ignored or misinterpreted.</p>

<h4>
  
  
  Customization Complexity
</h4>

<p>Styling and interacting with individual line numbers in an ordered list is straightforward. In contrast, the SVG approach makes it more difficult to customize or add interactivity to specific line numbers.</p>

<h4>
  
  
  Browser Compatibility
</h4>

<p>SVG and CSS custom properties might not render consistently across all browsers — the current implementation has issues with Safari, where we need to deduct (paddingTop / 10) from translateY.</p>
<h4>
  
  
  Dynamic Content Handling
</h4>

<p>Ordered lists can be more flexible for handling dynamic content updates, such as adding or removing lines, whereas the SVG approach might require regenerating and reapplying the entire background image.</p>

<p>The above is the detailed content of Line Numbers for <textarea> using SVG. For more information, please follow other related articles on the PHP Chinese website!</p>                </div>
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