add missing js

public/wp-content/themes/tecnologia/vamtam/assets/js/low-priority.js

@@ -0,0 +1,52 @@
+/* jshint esversion: 6 */
+
+(function( v, undefined ) {
+    'use strict';
+
+    // scroll to top button
+    {
+        var st_buttons = document.querySelectorAll( '.vamtam-scroll-to-top' );
+
+        if ( st_buttons.length ) {
+            var side_st_button = document.getElementById( 'scroll-to-top' ),
+                pageMiddle = window.innerHeight / 2;
+
+            if ( side_st_button ) {
+                v.addScrollHandler( {
+                    init: function() {},
+                    measure: function() {
+                        pageMiddle = window.innerHeight / 2;
+                    },
+                    mutate: function( cpos ) {
+                        if ( cpos > pageMiddle ) {
+                            side_st_button.style.opacity   = 1;
+                            side_st_button.style.transform = 'translate3d(0, 0, 0)';
+                        } else {
+                            side_st_button.style.opacity   = '';
+                            side_st_button.style.transform = 'translate3d(0, 100%, 0)';
+                        }
+                    }
+                } );
+            }
+
+            document.addEventListener( 'click', ( e ) => {
+                if ( e.target.closest( '.vamtam-scroll-to-top' ) ) {
+                    e.preventDefault();
+
+                    // iOS Safari uses a simple animation, normal browsers use scroll-behavior:smooth
+                    if ( /iPad|iPhone|iPod/.test( navigator.userAgent ) && ! window.MSStream ) {
+                        window.scrollTo( 0, 0 );
+                    } else {
+                        window.scroll( { left: 0, top: 0, behavior: 'smooth' } );
+                    }
+                }
+            }, true );
+        }
+
+        ( function wpRocketLazyRenderSafeGuard() {
+            window.addEventListener( 'load', function() {
+                document.querySelectorAll('[data-wpr-lazyrender]').forEach(el => delete el.dataset.wprLazyrender);
+            } );
+        } )();
+    }
+})( window.VAMTAM );