How can I dynamically swap CSS files to change a webpage\'s style without reloading?

Swapping CSS Files Dynamically to Transform Page Style

In web development, it's often desirable to modify a page's visual style on the fly. This can be achieved by replacing the existing CSS file with a different one. Here's how you can do it effectively without the need to reload the page:

Including Multiple Stylesheets

Begin by including all the potential CSS files in the HTML document's header. In this case, we have "light.css" and "dark.css".

Activate and Deactivate Stylesheets

To toggle the active stylesheet, you can either modify its relationship to the document, set its disabled attribute, or adjust its media attribute.

Using rel=alternate

<script>
  function enableStylesheet(node) {
    node.rel = 'stylesheet';
  }

  function disableStylesheet(node) {
    node.rel = 'alternate stylesheet';
  }
</script>

Setting disabled

<script>
  function enableStylesheet(node) {
    node.disabled = false;
  }

  function disableStylesheet(node) {
    node.disabled = true;
  }
</script>

Using media=none

<script>
  function enableStylesheet(node) {
    node.media = '';
  }

  function disableStylesheet(node) {
    node.media = 'none';
  }
</script>

Example Usage

Use getElementById or other selectors to target specific stylesheet nodes. For instance, if you have a button that triggers the style swap, you could do something like this:

document.querySelector('#swap-button').addEventListener('click', () => {
  disableStylesheet(document.getElementById('light'));
  enableStylesheet(document.getElementById('dark'));
});

This approach allows you to seamlessly switch between different CSS files and apply their styles dynamically, without having to worry about resetting element styles or reloading the page.

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