load 优化

components/FacebookMessenger.js

@@ -1,14 +1,41 @@
-import { Component } from 'react'
+import { Component, useEffect, useState } from 'react'
 import PropTypes from 'prop-types'
 import { siteConfig } from '@/lib/config'
 
 export default function Messenger() {
-  return <MessengerCustomerChat
-    pageId={siteConfig('FACEBOOK_PAGE_ID')}
-    appId={siteConfig('FACEBOOK_APP_ID')}
-    language={siteConfig('LANG').replace('-', '_')}
-    shouldShowDialog={true}
-  />
+  const pageId = siteConfig('FACEBOOK_PAGE_ID')
+  const appId = siteConfig('FACEBOOK_APP_ID')
+  const language = siteConfig('LANG').replace('-', '_')
+
+  // 新增一个状态变量用于追踪是否已经滚动过
+  const [showMessenger, setShowMessenger] = useState(false);
+
+  const showTheComponent = () => {
+    window.removeEventListener('scroll', showTheComponent);
+    if (!showMessenger) {
+      setShowMessenger(true);
+    }
+  };
+
+  // 延时7秒，或页面滚动时加载该组件
+  useEffect(() => {
+    window.addEventListener('scroll', showTheComponent);
+    setTimeout(() => {
+      showTheComponent()
+    }, 7000);
+    return () => {
+      window.removeEventListener('scroll', showTheComponent);
+    };
+  }, []);
+
+  return <>
+        {showMessenger && <MessengerCustomerChat
+            pageId={pageId}
+            appId={appId}
+            language={language}
+            shouldShowDialog={true}
+        />}
+    </>
 }
 
 /**
@@ -24,8 +51,8 @@ class MessengerCustomerChat extends Component {
   }
 
   /**
-   * 初始化
-   */
+     * 初始化
+     */
   componentDidMount() {
     this.setFbAsyncInit()
     this.reloadSDKAsynchronously()
@@ -34,19 +61,19 @@ class MessengerCustomerChat extends Component {
   componentDidUpdate(prevProps) {
     if (
       prevProps.pageId !== this.props.pageId ||
-      prevProps.appId !== this.props.appId ||
-      prevProps.shouldShowDialog !== this.props.shouldShowDialog ||
-      prevProps.htmlRef !== this.props.htmlRef ||
-      prevProps.minimized !== this.props.minimized ||
-      prevProps.themeColor !== this.props.themeColor ||
-      prevProps.loggedInGreeting !== this.props.loggedInGreeting ||
-      prevProps.loggedOutGreeting !== this.props.loggedOutGreeting ||
-      prevProps.greetingDialogDisplay !== this.props.greetingDialogDisplay ||
-      prevProps.greetingDialogDelay !== this.props.greetingDialogDelay ||
-      prevProps.autoLogAppEvents !== this.props.autoLogAppEvents ||
-      prevProps.xfbml !== this.props.xfbml ||
-      prevProps.version !== this.props.version ||
-      prevProps.language !== this.props.language
+            prevProps.appId !== this.props.appId ||
+            prevProps.shouldShowDialog !== this.props.shouldShowDialog ||
+            prevProps.htmlRef !== this.props.htmlRef ||
+            prevProps.minimized !== this.props.minimized ||
+            prevProps.themeColor !== this.props.themeColor ||
+            prevProps.loggedInGreeting !== this.props.loggedInGreeting ||
+            prevProps.loggedOutGreeting !== this.props.loggedOutGreeting ||
+            prevProps.greetingDialogDisplay !== this.props.greetingDialogDisplay ||
+            prevProps.greetingDialogDelay !== this.props.greetingDialogDelay ||
+            prevProps.autoLogAppEvents !== this.props.autoLogAppEvents ||
+            prevProps.xfbml !== this.props.xfbml ||
+            prevProps.version !== this.props.version ||
+            prevProps.language !== this.props.language
     ) {
       this.setFbAsyncInit()
       this.reloadSDKAsynchronously()
@@ -60,8 +87,8 @@ class MessengerCustomerChat extends Component {
   }
 
   /**
-   * 初始化
-   */
+     * 初始化
+     */
   setFbAsyncInit() {
     const { appId, autoLogAppEvents, xfbml, version } = this.props
 
@@ -80,18 +107,18 @@ class MessengerCustomerChat extends Component {
   loadSDKAsynchronously() {
     const { language } = this.props;
     /* eslint-disable */
-    (function (d, s, id) {
-      var js,
-        fjs = d.getElementsByTagName(s)[0];
-      if (d.getElementById(id)) {
-        return;
-      }
-      js = d.createElement(s);
-      js.id = id;
-      js.src = `https://connect.facebook.net/${language}/sdk/xfbml.customerchat.js`;
-      fjs.parentNode.insertBefore(js, fjs);
-    })(document, 'script', 'facebook-jssdk');
-    /* eslint-enable */
+        (function (d, s, id) {
+            var js,
+                fjs = d.getElementsByTagName(s)[0];
+            if (d.getElementById(id)) {
+                return;
+            }
+            js = d.createElement(s);
+            js.id = id;
+            js.src = `https://connect.facebook.net/${language}/sdk/xfbml.customerchat.js`;
+            fjs.parentNode.insertBefore(js, fjs);
+        })(document, 'script', 'facebook-jssdk');
+        /* eslint-enable */
   }
 
   removeFacebookSDK() {
@@ -147,25 +174,25 @@ class MessengerCustomerChat extends Component {
 
     const refAttribute = htmlRef !== undefined ? `ref="${htmlRef}"` : ''
     const minimizedAttribute =
-      minimized !== undefined ? `minimized="${minimized}"` : ''
+            minimized !== undefined ? `minimized="${minimized}"` : ''
     const themeColorAttribute =
-      themeColor !== undefined ? `theme_color="${themeColor}"` : ''
+            themeColor !== undefined ? `theme_color="${themeColor}"` : ''
     const loggedInGreetingAttribute =
-      loggedInGreeting !== undefined
-        ? `logged_in_greeting="${loggedInGreeting}"`
-        : ''
+            loggedInGreeting !== undefined
+              ? `logged_in_greeting="${loggedInGreeting}"`
+              : ''
     const loggedOutGreetingAttribute =
-      loggedOutGreeting !== undefined
-        ? `logged_out_greeting="${loggedOutGreeting}"`
-        : ''
+            loggedOutGreeting !== undefined
+              ? `logged_out_greeting="${loggedOutGreeting}"`
+              : ''
     const greetingDialogDisplayAttribute =
-      greetingDialogDisplay !== undefined
-        ? `greeting_dialog_display="${greetingDialogDisplay}"`
-        : ''
+            greetingDialogDisplay !== undefined
+              ? `greeting_dialog_display="${greetingDialogDisplay}"`
+              : ''
     const greetingDialogDelayAttribute =
-      greetingDialogDelay !== undefined
-        ? `greeting_dialog_delay="${greetingDialogDelay}"`
-        : ''
+            greetingDialogDelay !== undefined
+              ? `greeting_dialog_delay="${greetingDialogDelay}"`
+              : ''
 
     return {
       __html: `<div
@@ -192,8 +219,8 @@ class MessengerCustomerChat extends Component {
           const element = event.target
           if (
             element.className &&
-            typeof element.className === 'string' &&
-            element.className.includes('fb_dialog')
+                        typeof element.className === 'string' &&
+                        element.className.includes('fb_dialog')
           ) {
             this.controlPlugin()
           }