react项目中实现打印预览功能
最近项目中,前端采用react+antd+dva的组合,
今天有一个新需求,
需要在后台管理系统中实现 点击打印 完成指定页面的打印功能。
我们道浏览器带有打印功能的实现,window.print()。
然而,在react中是没有dom节点的,不过我们也是可以转为dom节点的。就是在需要打印的内容部分节点添加一个ID
只不过,这样打印出来的内容是没有带样式的,因为一般css文件并不会写到行内去,所以在生成html的文件字符串时,里面没有样式信息,在打印时就会布局混乱。
要想打印出来的效果与网页上显示的效果一致,就需要在生成html的文件字符串时,带上样式信息。
方法1:把样式信息写在行内
在文件信息不复杂时,可以写在行内
方法2:使用react-inline-css
使用这个npm包,可以在配置后把样式自动添加到行内
网页效果图:横版效果
打印预览竖版图:
代码下:
import React, { PureComponent } from 'react';
import moment from 'moment';
import { connect } from 'dva';
import {
Card,
Button,
Form,
Table,
message,
} from 'antd';
import styles from './Funds.less';
@connect(({ finance, loading }) => ({
finance,
loading: loading.models.list,
}))
@Form.create()
export default class LoanSettleMent extends PureComponent {
constructor(props) {
super(props);
this.state = {
loading: true,
};
}
componentDidMount() {
const code = !isEmptyObject(this.props.match) ? this.props.match.params.id : 0;
this.statisticalInfo({ receiptsCode: code });
}
// 结算单列表详情
statisticalInfo(params) {
this.props.dispatch({
type: 'finance/statisticalInfo',
payload: params,
}).then(() => {
this.setState({
loading: false,
})
});
}
// 撤销操作
fetchRevocation(params) {
this.props
.dispatch({
type: 'finance/fetchRevocation',
payload: params,
})
.then(() => {
const { finance: { revocationData } } = this.props;
const { code } = revocationData;
if (code === 200) {
message.info('撤销货款单成功!').then(() => {
window.location.href = '/funds/loansettlement';
});
} else {
message.info('撤销货款单失败!');
}
});
}
// 撤销
cancer = () => {
const code = !isEmptyObject(this.props.match) ? this.props.match.params.id : 0;
this.fetchRevocation({
receiptsCode: code,
});
};
// 返回
back = () => {
window.history.back();
};
// 打印
print(){
window.document.body.innerHTML = window.document.getElementById('billDetails').innerHTML;
window.print();
window.location.reload();
}
render() {
const { finance: { statisticalInfo }, loading } = this.props;
let data = [],
createName,
createTime;
if (statisticalInfo && !Array.isArray(statisticalInfo)) {
data = statisticalInfo;
createName = statisticalInfo.createName;
createTime = statisticalInfo.createTime;
}
if (statisticalInfo != undefined) {
data = statisticalInfo.goodsVos;
}
let _data = [],
receiptsCode;
if (statisticalInfo && !Array.isArray(statisticalInfo)) {
_data = statisticalInfo;
receiptsCode = statisticalInfo.receiptsCode;
}
const { supplierName, carNo, stallName, startTime, endTime, enable } = _data;
const len = data.length;
const columns = [
{
title: '品种',
dataIndex: 'attrName',
align: 'center',
},
{
title: '销售货款',
dataIndex: 'goodsAmount',
align: 'left',
render: (text, record, index) => {
const { goodsAmount, goodsPaymentStr } = record;
const type = goodsPaymentStr !== null ? goodsPaymentStr.split('负').length : -1;
if (index < len - 1) {
return <span>{goodsAmount ? Yuan(goodsAmount, 2) : ''}</span>;
}
return {
children:
type == 2 ? (
<span className={styles.neg}>{goodsPaymentStr}</span>
) : (
<span className={styles.bold}>{goodsPaymentStr}</span>
),
props: {
colSpan: 7,
},
};
},
},
{
title: '件数',
dataIndex: 'number',
align: 'center',
render: (text, record, index) => {
const { number } = record;
if (index < len - 1) {
return <span>{number ? number : ''}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
{
title: '重量',
dataIndex: 'weight',
align: 'center',
render: (text, record, index) => {
const { weight } = record;
if (index < len - 1) {
return <span>{weight ? weight : ''}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
{
title: '平均售价',
dataIndex: 'averageAmount',
align: 'center',
render: (text, record, index) => {
const { averageAmount } = record;
if (index < len - 1) {
return <span>{averageAmount ? Yuan(averageAmount, 2) : ''}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
{
title: '平均重量',
dataIndex: 'averageWeight',
align: 'center',
render: (text, record, index) => {
const { averageWeight } = record;
if (index < len - 1) {
return <span>{averageWeight ? averageWeight : ''}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
{
title: '费用类型',
dataIndex: 'type',
align: 'center',
render: (text, record, index) => {
const { type } = record;
if (index < len - 1) {
return <span>{type}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
{
title: '扣款金额',
dataIndex: 'amount',
align: 'center',
render: (text, record, index) => {
const { amount } = record;
if (index < len - 1) {
return <span>{amount !== null ? Yuan(amount, 2) : ''}</span>;
}
return {
children: '',
props: {
colSpan: 0,
},
};
},
},
];
return (
<PageHeaderLayout>
<div className={styles.billDetails} id={'billDetails'}>
<Card
bordered={false}
title=""
>
<div className={styles.paymentbill}>
<div style={{display: 'flex', height: '60px', lineHeight: '60px'}}>
<h1 style={{flex: 1, textAlign: 'center'}}>{stallName}</h1>
<span style={{position: 'absolute', right: '10px', color: '#FF6666', fontWeight: '600'}}>{`NO:${receiptsCode !== undefined ? receiptsCode : ''}`}</span>
</div>
<div style={{display: 'flex'}}>
<h2 style={{flex: 1, textAlign: 'center'}}>商品销售车次结算单</h2>
<div style={{position: 'absolute', right: '10px'}}>
<Button type="primary" onClick={this.cancer} disabled={!enable} style={{marginRight: '5px'}}>
撤销
</Button>
<Button onClick={this.print.bind(this)} style={{marginRight: '5px'}}>打印</Button>
<Button type="primary" onClick={this.back} style={{marginRight: '5px'}}>
返回
</Button>
</div>
</div>
<div style={{display: 'flex'}}>
<h3 style={{flex: 1, textAlign: 'left'}}>{`货老板:${supplierName !== undefined ? supplierName : ''} ${
carNo !== undefined ? fixedZeroTo4Bit(carNo, 4) : 0
}车`}
</h3>
<h3 style={{flex: 1}}>{`到货时间:${moment(startTime).format('YYYY-MM-DD')}`}</h3>
<h3 style={{flex: 1}}>{`售罄时间:${moment(endTime).format('YYYY-MM-DD')}`}</h3>
</div>
<img src={watermark} hidden={enable} style={{position: 'absolute', width: '100px', height: '100px', top: '120px', right: '80px',zIndex: 100}} />
</div>
</Card>
<Card
bordered={false}
title=""
bodyStyle={{ padding: '0 16px' }}
>
<Table
dataSource={data}
columns={columns}
bordered
pagination={false}
loading={this.state.loading}
/>
</Card>
<Card style={{ border: 0 }}>
<div style={{display: 'flex'}}>
<h3 style={{flex: 1}}>{`结算人:${createName !== undefined ? createName : ''}`}</h3>
<h3 style={{flex: 1, textAlign: 'right'}}>{`结算时间:${moment(createTime).format(
'YYYY-MM-DD'
)}`}</h3>
</div>
</Card>
</div>
</PageHeaderLayout>
);
}
}
一般直接使用window.print();是直接打印了整个页面,但只打印其中的一部分时就需要一些方法了
1、在页面的代码头部处加入JavaScript:
<script language=javascript>
function doPrint() {
bdhtml = window.document.body.innerHTML;
sprnstr = "<!--startprint-->"; //开始打印标识字符串有17个字符
eprnstr = "<!--endprint-->"; //结束打印标识字符串
prnhtml = bdhtml.substr(bdhtml.indexOf(sprnstr)+17); //从开始打印标识之后的内容
prnhtmlstr = prnhtml.substring(0,prnhtml.indexOf(eprnstr)); //截取开始标识和结束标识之间的内容
window.document.body.innerHTML = prnhtmlstr ; //把需要打印的指定内容赋给body.innerHTML
window.print(); //调用浏览器的打印功能打印指定区域
window.document.body.innerHTML = bdhtml;//重新给页面内容赋值;
}
</script>
2、在页面正文处加上<!–startprint–>与<!–endprint–>标识。
也就是在需要用户打印保存的正文所对应的html处附加上。同时,如果采用小偷程序获得远程数据并需打印,可将此等数据置于该定义标签之内即可。
3、截取内容部分已完成,现在加个“打印”的链接:
要打印的内容在
<!–startprint–>
startprint与endprint之间的区域
<!–endprint–>里。
添加打印链接事件
<a href="javascript:;" onClick="doPrint()">打印</a>