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htmx and Astro View Transitions

The Valley of Code

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When using both htmx and Astro View Transitions, I had an event that fired on page load, so I added a astro:after-swap event to handle doing the same thing I did after page load, but after a page transition:

<script>
  const triggerFetchLastUpdated = () => {
    const contentElement = document.getElementById('fetch-last-updated')
    if (contentElement) {
      htmx.trigger(contentElement, 'click', {})
    }
  }

  htmx.onLoad(triggerFetchLastUpdated)

  document.addEventListener('astro:after-swap', () => {
    triggerFetchLastUpdated()
  })
</script>

But, I hit a problem: I noticed my HTMX event didn’t fire after a transition.

Solution: make sure you call htmx.process() after a page swap.

During the astro:after-swap event:

<script>
  const triggerFetchLastUpdated = () => {
    const contentElement = document.getElementById('fetch-last-updated')
    if (contentElement) {
      htmx.trigger(contentElement, 'click', {})
    }
  }

  htmx.onLoad(triggerFetchLastUpdated)

  document.addEventListener('astro:after-swap', () => {
    htmx.process(document.body)
    triggerFetchLastUpdated()
  })
</script>

You could also just have one event astro:page-load and skip handling 2 different events (htmx.onLoad and astro:after-swap):

<script>
 document.addEventListener('astro:page-load', () => {
   const contentElement = document.getElementById('fetch-last-updated')
   if (contentElement) {
      htmx.process(document.body)
      htmx.trigger(contentElement, 'click', {})
    }
  })
</script>

…but that’s slower as fires at the end of page navigation. astro:after-swap instead fires immediately after the new page replaces the old page.

→ Read my Astro Tutorial on The Valley of Code
→ Read my HTMX Tutorial on The Valley of Code
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