scroll all the way to bottom when a new message arrives
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68b8568174
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2 changed files with 16 additions and 5 deletions
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@ -5,17 +5,20 @@ import gatewayConnection from '../../Gateway/globalGatewayConnection';
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import { useParams } from 'react-router-dom';
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import { connect } from 'react-redux';
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import { useState, useRef } from 'react';
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import { useState, useRef, useEffect } from 'react';
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function CategoryView({ categories, messages }) {
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const { id } = useParams();
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const [ textInput, setTextInput ] = useState('');
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const textInputRef = useRef(null);
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const invisibleBottomMessageRef = useRef(null);
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let category;
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if (categories) {
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category = categories.find(x => x._id === id);
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const scrollToBottom = () => {
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if (invisibleBottomMessageRef && invisibleBottomMessageRef.current) {
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invisibleBottomMessageRef.current.scrollIntoView({ behaviour: 'smooth' });
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}
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}
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const handleTextboxKeydown = (e) => {
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@ -27,6 +30,12 @@ function CategoryView({ categories, messages }) {
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}
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}
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useEffect(scrollToBottom, [messages]);
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if (categories) {
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category = categories.find(x => x._id === id);
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}
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if (category) {
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return (
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<div className="card main-card main-content-card">
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@ -35,6 +44,7 @@ function CategoryView({ categories, messages }) {
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</div>
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<div className="card message-list-card">
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{ messages.map(m => <Message key={ m._id } message={ m } />) }
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<div ref={ invisibleBottomMessageRef }></div>
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</div>
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<div className="card bar-card-bottom">
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<input className="text-input" type="text" placeholder="Go on, type something interesting!" ref={ textInputRef } onKeyDown={ handleTextboxKeydown } onChange={ ({ target }) => setTextInput(target.value) }></input>
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@ -207,7 +207,8 @@ body {
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display: flex;
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flex-direction: column;
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margin-top: 15px;
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margin-top: 12px;
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margin-bottom: 12px;
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margin-left: 5px;
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margin-right: 5px;
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padding: 5px;
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