Add vh/svh/dvh/lvh fallbacks

assets/scripts/app.js

@@ -1,25 +1,66 @@
 import modular from 'modujs';
 import * as modules from './modules';
 import globals from './globals';
-import { debounce } from './utils/tickers'
+import { debounce } from './utils/tickers';
 import { $html } from './utils/dom';
 import { ENV, FONT, CUSTOM_EVENT, CSS_CLASS } from './config'
 import { isFontLoadingAPIAvailable, loadFonts } from './utils/fonts';
 
 const app = new modular({
-    modules: modules,
+    modules,
 });
 
-window.addEventListener('load', (event) => {
+const setViewportSizes = () => {
+
+    // Document styles
+    const documentStyles = document.documentElement.style;
+
+    // Viewport width
+    const vw = document.body.clientWidth * 0.01;
+    documentStyles.setProperty('--vw', `${vw}px`);
+
+    // Return if browser supports vh, svh, dvh, & lvh
+    if (ENV.SUPPORTS_VH) {
+        return
+    }
+
+    // Viewport height
+    const height = window.innerHeight;
+    const svh = document.documentElement.clientHeight * 0.01;
+    documentStyles.setProperty('--svh', `${svh}px`);
+    const dvh = height * 0.01;
+    documentStyles.setProperty('--dvh', `${dvh}px`);
+
+    if (document.body) {
+        const fixed = document.createElement('div');
+        fixed.style.width = '1px';
+        fixed.style.height = '100vh';
+        fixed.style.position = 'fixed';
+        fixed.style.left = '0';
+        fixed.style.top = '0';
+        fixed.style.bottom = '0';
+        fixed.style.visibility = 'hidden';
+
+        document.body.appendChild(fixed);
+
+        var fixedHeight = fixed.clientHeight;
+
+        fixed.remove();
+
+        const lvh = fixedHeight * 0.01;
+
+        documentStyles.setProperty('--lvh', `${lvh}px`);
+    }
+}
+
+window.addEventListener('load', () => {
     const $style = document.getElementById('main-css');
 
     if ($style) {
         if ($style.isLoaded) {
             init();
         } else {
-            $style.addEventListener('load', (event) => {
-                init();
-            });
+            $style.addEventListener('load', init);
         }
     } else {
         console.warn('The "main-css" stylesheet not found');
@@ -28,6 +69,7 @@ window.addEventListener('load', (event) => {
 
 function init() {
     globals();
+    setViewportSizes();
 
     app.init(app);
 
@@ -36,14 +78,18 @@ function init() {
     $html.classList.remove(CSS_CLASS.LOADING);
 
     // Bind window resize event with default vars
-    const resizeEndEvent = new CustomEvent(CUSTOM_EVENT.RESIZE_END)
+    const resizeEndEvent = new CustomEvent(CUSTOM_EVENT.RESIZE_END);
     window.addEventListener('resize', () => {
-        $html.style.setProperty('--vw', `${document.documentElement.clientWidth * 0.01}px`)
+        setViewportSizes();
         debounce(() => {
-            window.dispatchEvent(resizeEndEvent)
+            window.dispatchEvent(resizeEndEvent);
         }, 200, false)
     })
 
+    window.addEventListener('orientationchange', () => {
+        setViewportSizes();
+    })
+
     /**
      * Eagerly load the following fonts.
      */
@@ -53,12 +99,12 @@ function init() {
 
             if (ENV.IS_DEV) {
                 console.group('Eager fonts loaded!', eagerFonts.length, '/', document.fonts.size);
-                console.group('State of eager fonts:')
-                eagerFonts.forEach((font) => console.log(font.family, font.style, font.weight, font.status/*, font*/))
-                console.groupEnd()
-                console.group('State of all fonts:')
-                document.fonts.forEach((font) => console.log(font.family, font.style, font.weight, font.status/*, font*/))
-                console.groupEnd()
+                console.group('State of eager fonts:');
+                eagerFonts.forEach(font => console.log(font.family, font.style, font.weight, font.status));
+                console.groupEnd();
+                console.group('State of all fonts:');
+                document.fonts.forEach(font => console.log(font.family, font.style, font.weight, font.status));
+                console.groupEnd();
             }
         });
     }

assets/scripts/config.js

@@ -21,6 +21,15 @@ const ENV = Object.freeze({
     // Device
     IS_MOBILE,
     IS_DESKTOP: !IS_MOBILE,
+
+    // Supports
+    SUPPORTS_VH: (
+        'CSS' in window
+        && 'supports' in window.CSS
+        && window.CSS.supports('height: 100svh')
+        && window.CSS.supports('height: 100dvh')
+        && window.CSS.supports('height: 100lvh')
+    )
 })
 
 // Main CSS classes used within the project

assets/styles/tools/_functions.scss

@@ -132,18 +132,46 @@ $context: 'frontend' !default;
     @return calc(#{$percentage} * (100vw - 2 * var(--grid-margin, 0px)) - (1 - #{$percentage}) * var(--grid-gutter, 0px) + #{$inset} * var(--grid-gutter, 0px));
 }
 
-// Returns calculation of a percentage of the viewport height.
+// Returns calculation of a percentage of the viewport small height.
 //
 // ```scss
 // .c-box {
-//     height: vh(100);
+//     height: svh(100);
 // }
 // ```
 //
 // @param  {number} $number - The percentage number
-// @return {function<number>} in vh
-@function vh($number) {
-    @return calc(#{$number} * var(--vh, 1vh));
+// @return {function<number>} in svh
+@function svh($number) {
+    @return calc(#{$number} * var(--svh, 1svh));
+}
+
+// Returns calculation of a percentage of the viewport large height.
+//
+// ```scss
+// .c-box {
+//     height: lvh(100);
+// }
+// ```
+//
+// @param  {number} $number - The percentage number
+// @return {function<number>} in lvh
+@function lvh($number) {
+    @return calc(#{$number} * var(--lvh, 1lvh));
+}
+
+// Returns calculation of a percentage of the viewport dynamic height.
+//
+// ```scss
+// .c-box {
+//     height: dvh(100);
+// }
+// ```
+//
+// @param  {number} $number - The percentage number
+// @return {function<number>} in dvh
+@function dvh($number) {
+    @return calc(#{$number} * var(--dvh, 1dvh));
 }
 
 // Returns calculation of a percentage of the viewport width.