今天学习React,写一个小demo记录一下,弄一个简单的个人消费记账系统.

使用脚手架 create-react-app ,后台使用mockAPI模拟,网络请求使用axios,css效果使用bootstrap/4.0.0 .
先来个效果图:
react-accounts-result
其主要代码均在../src/components中,主文件是Records.js,
具体的消费记录是Record.js,总消费记录是Box.js,消费记录的创建是RecordForm.js,下面是其源码:
Records.js

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import React, { Component } from 'react';
import Record from './Record'
import RecordForm from './RecordForm'
import Box from './Box'
import axios from 'axios'

export default class Records extends Component {

// 构造
constructor(props) {
super(props);
// 初始状态
this.state = {
error:null, //网络错误信息
isLoader:true, //加载标示
records:[] //数据
};
}


render() {
//根据 error isLoader 显示不同UI
//如果error有值,显示errorUI
//如果isLoader 为true,显示加载UI
//如果isLoader 为false,显示正确数据UI

const {error,isLoader,records} = this.state
let renderRecords;
if(error){
renderRecords = <div>出错了:{error}</div>
}else if(isLoader){
renderRecords = <div><img src={require('./loading.gif')} /></div>
}else {
renderRecords = (
<div>
<table className="table table-bordered">
<thead>
<tr>
<th>日期</th>
<th>标题</th>
<th>金额</th>
<th>事件</th>

</tr>
</thead>
<tbody>
{records.map((item,index)=>
<Record
key ={item.id}
record={item}
updateData={this.updateRecord.bind(this)}
deleteData={this.deleteRecord.bind(this)}
/>
)}
</tbody>
</table>
</div>
);
}

return(
<div>
<h2>消费记录</h2>
<div className="row mb-3">
<Box text="收入" type="success" amount={this.credits()} />
<Box text="支出" type="danger" amount={this.debits()} />
<Box text="余额" type="info" amount={this.balance()} />
</div>
<RecordForm handleNewRecord = {this.addRecord.bind(this)} />
{renderRecords}
</div>
)
}


/**
* 收入计算
* */
credits() {
let credits = this.state.records.filter((record) => {
return record.account >= 0;
})

return credits.reduce((prev, curr) => {
return prev + Number.parseInt(curr.account, 0)
}, 0)
}
/**
* 支出计算
* */
debits() {
let credits = this.state.records.filter((record) => {
return record.account < 0;
})

return credits.reduce((prev, curr) => {
return prev + Number.parseInt(curr.account, 0)
}, 0)
}
/**
* 余额计算
* */
balance() {
return this.credits() + this.debits();
}

/**
* 更新账单
* */
updateRecord(record, data) {
const recordIndex = this.state.records.indexOf(record);
const newRecords = this.state.records.map( (item, index) => {
if(index !== recordIndex) {
// This isn't the item we care about - keep it as-is
return item;
}

// Otherwise, this is the one we want - return an updated value
return {
...item,
...data
};
});
this.setState({
records: newRecords
});
}
/**
* 删除账单
* */
deleteRecord(record){
// console.log(record)
const recordIndex = this.state.records.indexOf(record);
const newRecords = this.state.records.filter( (item, index) => index !== recordIndex);
this.setState({
records: newRecords
});
}

/**
* 把最新数据赋值state
* */
addRecord (record) {
console.log(record)
this.setState({
error:null,
isLoader:false, //加载标示
records:[
...this.state.records,
record
]
})

}

//请求数据
componentDidMount() {
var that = this
axios.get('http://5b3450a9d167760014c265b5.mockapi.io/accounts/v1/accounts')
.then(response =>
that.setState({
isLoader:false,
records:response.data
})
)
.catch(err =>
that.setState({
error:err.message,
})
)


}

}

Record.js

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import React, { Component } from 'react';
import moment from "moment"; //日期格式
import axios from 'axios'

export default class Record extends Component {
// 构造
constructor(props) {
super(props);
// 初始状态
this.state = {
edit:false //编辑按钮状态
};
}

render() {
//如果编辑状态为true,显示编辑状态,否则显示默认状态
if(this.state.edit){
return this.renderEditRow()
}else {
return this.renderRow()
}
}


renderEditRow () {
var date = this.props.record.date
var newDate = moment(date).format('YYYY-MM-DD');
return (
<tr>
<td><input type="text" className="form-cantrol" defaultValue={newDate} ref="date" /></td>
<td><input type="text" className="form-cantrol" defaultValue={this.props.record.title} ref="title" /></td>
<td><input type="text" className="form-cantrol" defaultValue={this.props.record.account} ref="account" /></td>
<td>
<button className="btn btn-info mr-1" onClick={this.handleUpdate.bind(this)}>更新</button>
<button className="btn btn-danger " onClick={this.handleToggle.bind(this)}>取消</button>
</td>
</tr>
);
}

renderRow () {
var date = this.props.record.date
var newDate = moment(date).format('YYYY-MM-DD');
return (
<tr>
<td>{newDate}</td>
<td>{this.props.record.title}</td>
<td>{this.props.record.account}</td>
<td>
<button className="btn btn-info mr-1" onClick={this.handleToggle.bind(this)}>编辑</button>
<button className="btn btn-danger" onClick={this.handleDelete.bind(this)}>删除</button>
</td>
</tr>
);
}

/**
* 编辑按钮点击事件
* 对state edit做取反操作
* */
handleToggle () {
this.setState({
edit:!this.state.edit
})
}

/**
* 删除 按钮点击事件
* */
handleDelete (event) {
event.preventDefault()

var that = this
// alert(that.props.record.id)
axios.delete('http://5b3450a9d167760014c265b5.mockapi.io/accounts/v1/accounts/' + that.props.record.id)
.then(response =>{
console.log(response)
this.props.deleteData(that.props.record)
})
.catch(err =>{

})


}

/**
* 更新记录事件
* */
handleUpdate (event) {
event.preventDefault() // 方法阻止元素发生默认的行为

const record ={
date:this.refs.date.value,
title:this.refs.title.value,
account:this.refs.account.value
}

var that = this
// alert(that.props.record.id)
axios.put('http://5b3450a9d167760014c265b5.mockapi.io/accounts/v1/accounts/' + that.props.record.id,{
date:record.date,
title:record.title,
account:record.account
})
.then(response =>{
this.props.updateData(this.props.record,response.data)
this.setState({
edit:false
})
})
.catch(err =>
that.setState({
error:err.message,
})
)


}



}

Box.js

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/**
* 上部的总消费记录
* */
import React from 'react';

const Box = ({ text, type, amount }) => {
return (
<div className="col">
<div className="card">
<div className={`card-header bg-${type} text-white`}>
{text}
</div>
<div className="card-body">
{amount}
</div>
</div>
</div>
);
}

export default Box

RecordForm.js

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import React, { Component } from 'react';
import axios from 'axios'

export default class RecordForm extends Component {
// 构造
constructor(props) {
super(props);
// 初始状态
this.state = {
date:"",
title:"",
account:""
};
}
/**
* 判断按钮是否可用
* */

valid(){
return this.state.date && this.state.title && this.state.account;
}

/**
* 输入改变触发
* */
handleChange (event){
let name,obj;
name = event.target.name;
this.setState((
obj = {},
obj["" + name] = event.target.value,
obj
))
}
/**
* 提交按钮触发
* */

handleSubmit (event){
event.preventDefault()
var that = this
axios.post('http://5b3450a9d167760014c265b5.mockapi.io/accounts/v1/accounts',{
date:that.state.date,
title:that.state.title,
account:that.state.account
})
.then(response =>{
console.log(response);
this.props.handleNewRecord(response.data)
that.setState({
date:"",
title:"",
account:""
})

})
.catch(err =>
that.setState({
error:err.message,
})
)
}

render() {
return (
<form className="form-inline mb-2" onSubmit={this.handleSubmit.bind(this)} >
<div className="form-group mr-1">
<input type="text" onChange={this.handleChange.bind(this)} value={this.state.date} className="form-control" placeholder="时间" name="date" />
</div>
<div className="form-group mr-1">
<input type="text" onChange={this.handleChange.bind(this)} value={this.state.title} className="form-control" placeholder="标题" name="title" />
</div>
<div className="form-group mr-1">
<input type="text" onChange={this.handleChange.bind(this)} value={this.state.account} className="form-control" placeholder="账目" name="account" />
</div>
<button type="submit" className="btn btn-primary" disabled={!this.valid()} >创建</button>
</form>
);
}

}

ok,下面是源码:
源码地址
学习前端