init

wp-content/themes/flatsome/inc/extensions/flatsome-instant-page/flatsome-instant-page.js

@@ -0,0 +1,131 @@
+// modified to work without type="module"
+
+;(function () {
+  /*! instant.page v1.2.2 - (C) 2019 Alexandre Dieulot - https://instant.page/license */
+
+  var urlToPreload
+  var mouseoverTimer
+  var lastTouchTimestamp
+
+  var prefetcher = document.createElement('link')
+  var isSupported = prefetcher.relList && prefetcher.relList.supports && prefetcher.relList.supports('prefetch')
+  var isDataSaverEnabled = navigator.connection && navigator.connection.saveData
+  var allowQueryString = 'instantAllowQueryString' in document.body.dataset
+  var allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset
+
+  if (isSupported && !isDataSaverEnabled) {
+    prefetcher.rel = 'prefetch'
+    document.head.appendChild(prefetcher)
+
+    var eventListenersOptions = {
+      capture: true,
+      passive: true
+    }
+    document.addEventListener('touchstart', touchstartListener, eventListenersOptions)
+    document.addEventListener('mouseover', mouseoverListener, eventListenersOptions)
+  }
+
+  function touchstartListener (event) {
+    /* Chrome on Android calls mouseover before touchcancel so `lastTouchTimestamp`
+     * must be assigned on touchstart to be measured on mouseover. */
+    lastTouchTimestamp = performance.now()
+
+    var linkElement = event.target.closest('a')
+
+    if (!isPreloadable(linkElement)) {
+      return
+    }
+
+    linkElement.addEventListener('touchcancel', touchendAndTouchcancelListener, { passive: true })
+    linkElement.addEventListener('touchend', touchendAndTouchcancelListener, { passive: true })
+
+    urlToPreload = linkElement.href
+    preload(linkElement.href)
+  }
+
+  function touchendAndTouchcancelListener () {
+    urlToPreload = undefined
+    stopPreloading()
+  }
+
+  function mouseoverListener (event) {
+    if (performance.now() - lastTouchTimestamp < 1100) {
+      return
+    }
+
+    var linkElement = event.target.closest('a')
+
+    if (!isPreloadable(linkElement)) {
+      return
+    }
+
+    linkElement.addEventListener('mouseout', mouseoutListener, { passive: true })
+
+    urlToPreload = linkElement.href
+
+    mouseoverTimer = setTimeout(function () {
+      preload(linkElement.href)
+      mouseoverTimer = undefined
+    }, 65)
+  }
+
+  function mouseoutListener (event) {
+    if (event.relatedTarget && event.target.closest('a') === event.relatedTarget.closest('a')) {
+      return
+    }
+
+    if (mouseoverTimer) {
+      clearTimeout(mouseoverTimer)
+      mouseoverTimer = undefined
+    } else {
+      urlToPreload = undefined
+      stopPreloading()
+    }
+  }
+
+  function isPreloadable (linkElement) {
+    if (!linkElement || !linkElement.href) {
+      return
+    }
+
+    if (urlToPreload === linkElement.href) {
+      return
+    }
+
+    var preloadLocation = new URL(linkElement.href)
+
+    if (!allowExternalLinks && preloadLocation.origin !== location.origin && !('instant' in linkElement.dataset)) {
+      return
+    }
+
+    if (!['http:', 'https:'].includes(preloadLocation.protocol)) {
+      return
+    }
+
+    if (preloadLocation.protocol === 'http:' && location.protocol === 'https:') {
+      return
+    }
+
+    if (!allowQueryString && preloadLocation.search && !('instant' in linkElement.dataset)) {
+      return
+    }
+
+    if (preloadLocation.hash && preloadLocation.pathname + preloadLocation.search === location.pathname + location.search) {
+      return
+    }
+
+    if ('noInstant' in linkElement.dataset) {
+      return
+    }
+
+    return true
+  }
+
+  function preload (url) {
+    prefetcher.href = url
+  }
+
+  function stopPreloading () {
+    prefetcher.removeAttribute('href')
+  }
+})()

wp-content/themes/flatsome/inc/extensions/flatsome-instant-page/flatsome-instant-page.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Flatsome Instant Page extension
+ *
+ * @author     UX Themes
+ * @category   Extension
+ * @package    Flatsome/Extensions
+ * @since      3.9.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+  exit;
+}
+
+add_action( 'wp_enqueue_scripts', 'flatsome_instant_page' );
+
+if ( ! function_exists( 'flatsome_instant_page' ) ) :
+
+function flatsome_instant_page() {
+  global $extensions_uri;
+
+  wp_enqueue_script(
+    'flatsome-instant-page',
+    $extensions_uri . '/flatsome-instant-page/flatsome-instant-page.js',
+    array(),
+    '1.2.1',
+    true
+  );
+}
+
+endif;