{const letters = 0123456789ABCDEF ;let color = # ;for (let i = 0; i < 6; i+..."/>
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準(zhǔn)備通用工具函數(shù)
const getRandomColor = () => {
const letters = '0123456789ABCDEF';
let color = '#';
for (let i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)]
}
return color;
};
const translateY = (value) => {
return translateY(${value}px)
;
}
使用useState Hook聲明狀態(tài)變量
我們開始編寫組件DynamicBarChart
const DynamicBarChart = (props) => {
const [dataQueue, setDataQueue] = useState([]);
const [activeItemIdx, setActiveItemIdx] = useState(0);
const [highestValue, setHighestValue] = useState(0);
const [currentValues, setCurrentValues] = useState({});
const [firstRun, setFirstRun] = useState(false);
// 其它代碼...
}
// 動(dòng)態(tài)跑起來~
function start () {
if (activeItemIdx > 1) {
return;
}
nextStep(true);
}
// 對(duì)下一幀數(shù)據(jù)進(jìn)行處理
function setNextValues () {
// 沒有幀數(shù)時(shí)(即已結(jié)束),停止渲染
if (!dataQueue[activeItemIdx]) {
iterationTimeoutHolder = null;
return;
}
// 每一幀的數(shù)據(jù)數(shù)組
const roundData = dataQueue[activeItemIdx].values;
const nextValues = {};
let highestValue = 0;
// 處理數(shù)據(jù),用作最后渲染(各種樣式,顏色)
roundData.map((c) => {
nextValues[c.id] = {
...c,
color: c.color || (currentValues[c.id] || {}).color || getRandomColor()
};
if (Math.abs(c.value) > highestValue) {
highestValue = Math.abs(c.value);
}
return c;
});
// 屬性的操作,觸發(fā)useEffect
setCurrentValues(nextValues);
setHighestValue(highestValue);
setActiveItemIdx(activeItemIdx + 1);
}
// 觸發(fā)下一步,循環(huán)
function nextStep (firstRun = false) {
setFirstRun(firstRun);
setNextValues();
}
對(duì)應(yīng)useEffect:
// 取原始數(shù)據(jù)
useEffect(() => {
setDataQueue(props.data);
}, []);
// 觸發(fā)動(dòng)態(tài)
useEffect(() => {
start();
}, [dataQueue]);
// 設(shè)觸發(fā)動(dòng)態(tài)間隔
useEffect(() => {
iterationTimeoutHolder = window.setTimeout(nextStep, 1000);
return () => {
if (iterationTimeoutHolder) {
window.clearTimeout(iterationTimeoutHolder);
}
};
}, [activeItemIdx]);
useEffect示例:
useEffect(() => {
document.title = You clicked ${count} times
;
}, [count]); // 僅在 count 更改時(shí)更新
為什么要在 effect 中返回一個(gè)函數(shù)?
這是 effect 可選的清除機(jī)制。每個(gè) effect 都可以返回一個(gè)清除函數(shù)。如此可以將添加和移除訂閱的邏輯放在一起。
整理用于渲染頁(yè)面的數(shù)據(jù)
const keys = Object.keys(currentValues);
const { barGapSize, barHeight, showTitle } = props;
const maxValue = highestValue / 0.85;
const sortedCurrentValues = keys.sort((a, b) => currentValues[b].value - currentValues[a].value);
const currentItem = dataQueue[activeItemIdx - 1] || {};
keys: 每組數(shù)據(jù)的索引
maxValue: 圖表最大寬度
sortedCurrentValues: 對(duì)每組數(shù)據(jù)進(jìn)行排序,該項(xiàng)影響動(dòng)態(tài)渲染。
currentItem: 每組的原始數(shù)據(jù)
開始渲染頁(yè)面
大致的邏輯就是:
根據(jù)不同Props,循環(huán)排列后的數(shù)據(jù):sortedCurrentValues
計(jì)算寬度,返回每項(xiàng)的label、bar、value
根據(jù)計(jì)算好的高度,觸發(fā)transform。
<div className="live-chart">
{
<React.Fragment>
{
showTitle &&
<h2>{currentItem.name}</h2>
}
<section className="chart">
<div className="chart-bars" style={{ height: (barHeight + barGapSize) keys.length }}>
{
sortedCurrentValues.map((key, idx) => {
const currentValueData = currentValues[key];
const value = currentValueData.value
let width = Math.abs((value / maxValue 100));
let widthStr;
if (isNaN(width) || !width) {
widthStr = '1px';
} else {
widthStr = ${width}%
;
}
return (
<div className={`bar-wrapper`} style={{ transform: translateY((barHeight + barGapSize) * idx), transitionDuration: 200 / 1000 }} key={`bar_${key}`}>
<label>
{
!currentValueData.label
? key
: currentValueData.label
}
</label>
<div className="bar" style={{ height: barHeight, width: widthStr, background: typeof currentValueData.color === 'string' ? currentValueData.color : `linear-gradient(to right, ${currentValueData.color.join(',')})` }} />
<span className="value" style={{ color: typeof currentValueData.color === 'string' ? currentValueData.color : currentValueData.color[0] }}>{currentValueData.value}</span>
</div>
);
})
}
</div>
</section>
</React.Fragment>
}
</div>
定義常規(guī)propTypes和defaultProps
DynamicBarChart.propTypes = {
showTitle: PropTypes.bool,
iterationTimeout: PropTypes.number,
data: PropTypes.array,
startRunningTimeout: PropTypes.number,
barHeight: PropTypes.number,
barGapSize: PropTypes.number,
baseline: PropTypes.number,
};
DynamicBarChart.defaultProps = {
showTitle: true,
iterationTimeout: 200,
data: [],
startRunningTimeout: 0,
barHeight: 50,
barGapSize: 20,
baseline: null,
};
export {
DynamicBarChart
};
如何使用
import React, { Component } from "react";
import { DynamicBarChart } from "./DynamicBarChart";
import helpers from "./helpers";
import mocks from "./mocks";
import "react-dynamic-charts/dist/index.css";
export default class App extends Component {
render() {
return (
<DynamicBarChart
barGapSize={10}
data={helpers.generateData(100, mocks.defaultChart, {
prefix: "Iteration"
})}
iterationTimeout={100}
showTitle={true}
startRunningTimeout={2500}
/>
)
}
}
helpers.js:
function getRandomNumber(min, max) {
return Math.floor(Math.random() * (max - min + 1) + min);
};
function generateData(iterations = 100, defaultValues = [], namePrefix = {}, maxJump = 100) {
const arr = [];
for (let i = 0; i <= iterations; i++) {
const values = defaultValues.map((v, idx) => {
if (i === 0 && typeof v.value === 'number') {
return v;
}
return {
...v,
value: i === 0 ? this.getRandomNumber(1, 1000) : arr[i - 1].values[idx].value + this.getRandomNumber(0, maxJump)
}
});
arr.push({
name: ${namePrefix.prefix || ''} ${(namePrefix.initialValue || 0) + i}
,
values
});
}
return arr;
};
export default {
getRandomNumber,
generateData
}
mocks.js:
import helpers from './helpers';
const defaultChart = [
{
id: 1,
label: 'Google',
value: helpers.getRandomNumber(0, 50)
},
{
id: 2,
label: 'Facebook',
value: helpers.getRandomNumber(0, 50)
},
{
id: 3,
label: 'Outbrain',
value: helpers.getRandomNumber(0, 50)
},
{
id: 4,
label: 'Apple',
value: helpers.getRandomNumber(0, 50)
},
{
id: 5,
label: 'Amazon',
value: helpers.getRandomNumber(0, 50)
},
];
export default {
defaultChart,
}
一個(gè)乞丐版的動(dòng)態(tài)排行榜可視化就做好喇。
完整代碼
import React, { useState, useEffect } from 'react';
import PropTypes from 'prop-types';
import './styles.scss';
const getRandomColor = () => {
const letters = '0123456789ABCDEF';
let color = '#';
for (let i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)]
}
return color;
};
const translateY = (value) => {
return translateY(${value}px)
;
}
const DynamicBarChart = (props) => {
const [dataQueue, setDataQueue] = useState([]);
const [activeItemIdx, setActiveItemIdx] = useState(0);
const [highestValue, setHighestValue] = useState(0);
const [currentValues, setCurrentValues] = useState({});
const [firstRun, setFirstRun] = useState(false);
let iterationTimeoutHolder = null;
function start () {
if (activeItemIdx > 1) {
return;
}
nextStep(true);
}
function setNextValues () {
if (!dataQueue[activeItemIdx]) {
iterationTimeoutHolder = null;
return;
}
const roundData = dataQueue[activeItemIdx].values;
const nextValues = {};
let highestValue = 0;
roundData.map((c) => {
nextValues[c.id] = {
...c,
color: c.color || (currentValues[c.id] || {}).color || getRandomColor()
};
if (Math.abs(c.value) > highestValue) {
highestValue = Math.abs(c.value);
}
return c;
});
console.table(highestValue);
www.kaifx.cn
setCurrentValues(nextValues);
setHighestValue(highestValue);
setActiveItemIdx(activeItemIdx + 1);
}
function nextStep (firstRun = false) {
setFirstRun(firstRun);
setNextValues();
}
useEffect(() => {
setDataQueue(props.data);
}, []);
useEffect(() => {
start();
}, [dataQueue]);
useEffect(() => {
iterationTimeoutHolder = window.setTimeout(nextStep, 1000);
return () => {
if (iterationTimeoutHolder) {
window.clearTimeout(iterationTimeoutHolder);
}
};
}, [activeItemIdx]);
const keys = Object.keys(currentValues);
const { barGapSize, barHeight, showTitle, data } = props;
console.table('data', data);
const maxValue = highestValue / 0.85;
const sortedCurrentValues = keys.sort((a, b) => currentValues[b].value - currentValues[a].value);
const currentItem = dataQueue[activeItemIdx - 1] || {};
return (
<div className="live-chart">
{
<React.Fragment>
{
showTitle &&
<h2>{currentItem.name}</h2>
}
<section className="chart">
<div className="chart-bars" style={{ height: (barHeight + barGapSize) keys.length }}>
{
sortedCurrentValues.map((key, idx) => {
const currentValueData = currentValues[key];
const value = currentValueData.value
let width = Math.abs((value / maxValue 100));
let widthStr;
if (isNaN(width) || !width) {
widthStr = '1px';
} else {
widthStr = ${width}%
;
}
return (
<div className={`bar-wrapper`} style={{ transform: translateY((barHeight + barGapSize) * idx), transitionDuration: 200 / 1000 }} key={`bar_${key}`}>
<label>
{
!currentValueData.label
? key
: currentValueData.label
}
</label>
<div className="bar" style={{ height: barHeight, width: widthStr, background: typeof currentValueData.color === 'string' ? currentValueData.color : `linear-gradient(to right, ${currentValueData.color.join(',')})` }} />
<span className="value" style={{ color: typeof currentValueData.color === 'string' ? currentValueData.color : currentValueData.color[0] }}>{currentValueData.value}</span>
</div>
);
})
}
</div>
</section>
</React.Fragment>
}
</div>
);
};
DynamicBarChart.propTypes = {
showTitle: PropTypes.bool,
iterationTimeout: PropTypes.number,
data: PropTypes.array,
startRunningTimeout: PropTypes.number,
barHeight: PropTypes.number,
barGapSize: PropTypes.number,
baseline: PropTypes.number,
};
DynamicBarChart.defaultProps = {
showTitle: true,
iterationTimeout: 200,
data: [],
startRunningTimeout: 0,
barHeight: 50,
barGapSize: 20,
baseline: null,
};
export {
DynamicBarChart
};
styles.scss
.live-chart {
width: 100%;
padding: 20px;
box-sizing: border-box;
position: relative;
text-align: center;
h2 {
font-weight: 700;
font-size: 60px;
text-transform: uppercase;
text-align: center;
padding: 20px 10px;
margin: 0;
}
.chart {
position: relative;
margin: 20px auto;
}
.chart-bars {
position: relative;
width: 100%;
}
.bar-wrapper {
display: flex;
flex-wrap: wrap;
align-items: center;
position: absolute;
top: 0;
left: 0;
transform: translateY(0);
transition: transform 0.5s linear;
padding-left: 200px;
box-sizing: border-box;
width: 100%;
justify-content: flex-start;
label {
position: absolute;
height: 100%;
width: 200px;
left: 0;
padding: 0 10px;
box-sizing: border-box;
text-align: right;
top: 50%;
transform: translateY(-50%);
font-size: 16px;
font-weight: 700;
display: flex;
justify-content: flex-end;
align-items: center;
}
.value {
font-size: 16px;
font-weight: 700;
margin-left: 10px;
}
.bar {
width: 0%;
transition: width 0.5s linear;
}
}
}
結(jié)語
一直對(duì)實(shí)現(xiàn)動(dòng)態(tài)排行榜可視化感興趣,無奈多數(shù)都是基于D3或echarts實(shí)現(xiàn)。
而這個(gè)庫(kù),不僅脫離圖形庫(kù),還使用了React 16的新特性。也讓我徹底理解了React Hook的妙用。
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