Javascript - Wrap TAGS around STRINGS - PURE JS

StuckOverflow
August 19, 2024
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2 Answers

I need to change the font of all digits in the page.

I thought about using insertBefore() and so on – but then I realized it can’t be used with strings.

What I currently have:

An array with all the text in the page.
An array with all digits.
An array with all digits replaced with the replace() function (A failed attempt).

I also tried to create a for loop that would loop over all words in the array and assign them an element created with a variable – but apparently they can’t be accessed.

How could I wrap all items of the 'string' array with a span or any other tag?

NOTE: I’d rather not use innerHTML.

Thank you very much!

let allText = document.querySelector('body p').textContent;
console.log(allText);

let digits = allText.match(/d/gi);
console.log(digits);

let rep = allText.replace(/d/gi, "AA");
console.log(rep);
document.body.textContent = rep;

<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        body {
            text-align: center;

            font-size: 40px;
        }
    </style>
</head>
<body>
    <p>
        sdfjsdf
        (1): sdfdsdfs --
        (1): sdfdsdfs --
        (2) sdfsdf --
        (3): sdfsdfs --
        sdfdsfsdf --
    </p>

    <script src="a.js"></script>
</body>
</html>

Tags: javascript

Answers

As long as there are no numbers inside tags inside the content

I changed to pre to keep the list

NOTE: The use of innerHTML CAN have some XSS issues. If the content of the P tag has not been sanitized, you do run a risk. So here is a version that is XSS safe. I just read in your comment that you did not want innerHTML anyway

let allText = document.querySelector('body p').textContent;
console.log(allText);
const outputElement = document.getElementById('output');
outputElement.textContent= ''; // empty the output

allText.split('n').forEach(line => {
  // Create a container for the line
  const lineElement = document.createElement('div');
  // Split the line into parts by numbers, capturing the numbers to keep them in the result
  const parts = line.split(/(d+)/);
  console.log(parts)
  parts.forEach(part => { 
    if (/d+/.test(part)) {
      // wrap a number in a span
      const span = document.createElement('span');
      span.className = 'number';
      span.textContent = part;
      lineElement.appendChild(span);
    } else {
      lineElement.appendChild(document.createTextNode(part));
    }
  });
  outputElement.appendChild(lineElement);
});

.number {
  color: red;
}

/* stop console.log from hiding output */
.as-console-wrapper { height:40px !important;}

<p>
        sdfjsdf
        (1): sdfdsdfs --
        (1): sdfdsdfs --
        (2) sdfsdf --
        (3): sdfsdfs --
        sdfdsfsdf --
    </p>

<pre id="output"></pre>

If you are not bothered, then here is a simpler version

let allText = document.querySelector('body p').textContent;
console.log(allText);

document.getElementById('output').innerHTML = allText
  .replace(/d+/g, match => `<span class="number">${match}</span>`)

.number {
  color: red;
}


.as-console-wrapper { height:40px !important;}

<p>
        sdfjsdf
        (1): sdfdsdfs --
        (1): sdfdsdfs --
        (2) sdfsdf --
        (3): sdfsdfs --
        sdfdsfsdf --
    </p>

<pre id="output"></pre>

If the objective is to wrap each number sequence in the document, here’s one approach:

// Find all the document's text nodes
const treeWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_TEXT,
);

// Collect the text nodes into an array
const nodes = [];
while (treeWalker.nextNode()) {
  nodes.push(treeWalker.currentNode);
}

// Go through each text node...
for (const node of nodes) {
  const matches = [
    // Find each string of digits, adding them to an array...
    ...node.data.matchAll(/d+/g)
    //  ...so that we can reverse them (we do this so our indexes
    //    don't become stale after we wrap the first text node)
  ].reverse();
  for (const match of matches) {
    // Create a range to include the sequence of digits
    const range = document.createRange();
    range.setStart(node, match.index);
    range.setEnd(node, match.index + match[0].length);
    // Create our wrapping element
    const newParent = document.createElement('b');
    // Surround the digits with our wrapping element
    range.surroundContents(newParent);
  }
}

<p>This text has 123 some numbers 456 including <i>nested 789</i>.</p>

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Javascript – Wrap TAGS around STRINGS – PURE JS

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