(nextjs) added SSR Loader

src/components/common/LoadingProgress/index.tsx

@@ -0,0 +1,22 @@
+import React, { Fragment, VFC } from 'react';
+
+import { useSSRLoadingIndicator } from '~/hooks/dom/useSSRLoadingIndicator';
+
+import styles from './styles.module.scss';
+
+interface LoadingProgressProps {}
+
+const LoadingProgress: VFC<LoadingProgressProps> = () => {
+  const shown = useSSRLoadingIndicator();
+
+  return shown ? (
+    <>
+      <div className={styles.loader} />
+      <div className={styles.label}>Секундочку...</div>
+    </>
+  ) : (
+    <Fragment />
+  );
+};
+
+export { LoadingProgress };

src/components/common/LoadingProgress/styles.module.scss

@@ -0,0 +1,38 @@
+@import "src/styles/variables";
+
+@keyframes spin {
+  0% {
+    background-position: 0 0;
+  }
+
+  100% {
+    background-position: 100vw 0;
+  }
+}
+
+.loader {
+  display: flex;
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 4px;
+  z-index: 100;
+  align-items: center;
+  justify-content: center;
+  background: linear-gradient(90deg, $dark_blue, $soft_blue, $dark_blue);
+  animation: spin infinite 1s linear;
+}
+
+.label {
+  position: fixed;
+  top: $gap + 4px;
+  left: 50%;
+  font: $font_12_semibold;
+  background: red;
+  z-index: 100;
+  transform: translate(-50%, 0);
+  padding: 2px 10px;
+  border-radius: 10px;
+  background: $cyan_gradient;
+}

src/containers/main/MainLayout/index.tsx

@@ -1,5 +1,6 @@
 import * as React from 'react';
 
+import { LoadingProgress } from '~/components/common/LoadingProgress';
 import { Header } from '~/containers/main/Header';
 import { SidebarRouter } from '~/containers/main/SidebarRouter';
 
@@ -10,6 +11,7 @@ export const MainLayout = ({ children }) => (
     <div className={styles.content}>
       <Header />
       {children}
+      <LoadingProgress />
       <SidebarRouter />
     </div>
   </div>

src/hooks/dom/useSSRLoadingIndicator.ts

@@ -0,0 +1,15 @@
+import { useEffect, useState } from 'react';
+
+import Router from 'next/router';
+
+export const useSSRLoadingIndicator = () => {
+  const [shown, setShown] = useState(false);
+
+  useEffect(() => {
+    Router.events.on('routeChangeStart', () => setShown(true));
+    Router.events.on('routeChangeComplete', () => setShown(false));
+    Router.events.on('routeChangeError', () => setShown(false));
+  }, []);
+
+  return shown;
+};

src/styles/_colors.scss

@@ -9,6 +9,7 @@ $orange: #ff7549;
 $grass: #41800d;
 $wisegreen: #007962;
 $lightgreen: lighten(adjust_hue($wisegreen, -30deg), 10%);
+$soft_blue: #3c75ff;
 
 $primary: $red;
 $secondary: $wisegreen;
@@ -21,7 +22,7 @@ $green_gradient: linear-gradient(
   $wisegreen 150%
 );
 $purple_gradient: linear-gradient(170deg, $red, $dark_blue);
-$cyan_gradient: linear-gradient(260deg, #3c75ff -50%, #7b2653 150%);
+$cyan_gradient: linear-gradient(260deg, $soft_blue -50%, #7b2653 150%);
 
 $red_gradient_alt: linear-gradient(170deg, #ff4545, #d2004c);
 $purple_gradient_alt: linear-gradient(90deg, #442294, #ff4545);