Vue3+TypeScript+printjs 实现标签批量打印功能

前言：临时性需求没怎么接触过前端，代码实现有问题及优化点希望大佬可以留言告知一下

开发工具：VS CODE

界面开发：Vue3+TypeScript+ElementPlus

打印组件：Print-JS

前端打印入口图：

标签页面：

打印界面：

实现功能：前端点击"打印标签"弹出打印界面进行打印作业

实现过程：主界面点击"打印标签"调用el-dialog弹窗(预览和直接打印都居于弹窗实现)

标签模板代码：

<template>
    <div class="LabelPrint-List">
        <el-dialog v-model="state.isShowDialog" draggable :close-on-click-modal="false" width="50%" >
            <template #header>
				<div style="color: #fff">
					<el-icon size="16" style="margin-right: 3px; display: inline; vertical-align: middle"> <ele-Edit/> </el-icon>
					<span>标签打印界面</span>
				</div>
			</template>
            <el-row :gutter="10">
                <el-col :xs="24" :sm="24" :md="24" :lg="24" :xl="24" class="mb10">
                     <div v-for="item in state.Datas">
                        <el-card class="box-card" style="width:100mm; height: 90mm;display: block;" >
                            <div :id='item.id?.toString()'>
                                <!-- print-js -->
                                <div class="labelHeadBody">
                                    <div class="labelHeadBodyLeftHead">
                                        <img class="labelHeadBodyLeftHeadimage"  src="/image/点金log.png" fit="fill" />
                                    </div>
                                    <div class="labelHeadBodyRightHead">
                                        <table class="tableHead">
                                            <tr>
                                                <td class="labelHeadBodyRightHeadTd">某某有限公司</td>
                                            </tr>
                                            <tr>
                                                <td class="labelHeadBodyRightHeadTd">物料标识卡</td>
                                            </tr>
                                        </table>
                                    </div>
                                </div>
                                <div class="labelBody">
                                     <table>
                                        <tbody>
                                            <tr><td class="lableBodytdleft">P/N：</td><td class="lableBodytdright">{{ item.produceNo }}</td></tr>
                                            <tr><td class="lableBodytdleft">数量：</td><td class="lableBodytdright">{{ item.quantity }}</td></tr>
                                            <tr><td class="lableBodytdleft">规格：</td><td class="lableBodytdright lableBodytdrightfont">{{ item.platingSpecs }}</td></tr>
                                            <tr><td class="lableBodytdleft">供应商：</td><td class="lableBodytdright">东莞点金</td></tr>
                                            <tr><td class="lableBodytdleft">生产日期：</td><td class="lableBodytdright">{{moment(String(item.createTime)).format('YYYY/MM/DD')}}</td></tr>
                                            <tr><td class="lableBodytdleft">批次单号：</td><td class="lableBodytdright">{{ item.lot }}</td></tr>
                                            <tr><td class="lableBodytdleft">单重：</td><td class="lableBodytdright">{{ item.singleWeight }}</td></tr>
                                            <tr><td class="lableBodytdleft">总重：</td><td class="lableBodytdright">{{ item.sumWeight }}</td></tr>
                                            <tr><td class="lableBodytdleft">标识人：</td><td class="lableBodytdright"></td></tr>
                                        </tbody>
                                     </table>
                                </div>
                                
                            </div>
                        </el-card>
                     </div>
                </el-col>
            </el-row>
            <template #footer>
				<span class="dialog-footer">
					<el-button @click="cancel">取 消</el-button>
                    <el-button style="background-color:red;color:white" @click="print">打 印</el-button>
				</span>
			</template> 
        </el-dialog>
    </div>
</template>

Typescript代码：

printrow 方法中使用nextTick是当el-dialog弹窗DOM加载完成后在调用PrintJS获取需要打印的区域，这个直接打印过程其实会先弹窗然后DOM加载完成后直接调用浏览器打印界面，后面把弹出关闭，如果不加载el-dialog可以通过动态加载html内容来实现直接打印，我这里图方便就用该方法实现了。

printJS({printable:区域id,type:打印类型(pdf\image\html等),style:打印内容的CSS样式})

注意：style参数值按打印区域的HTMLCSS样式构建，调用printJS设置scanStyles:false不会自动加载HTML的CSS样式需要重新给Style参数赋值所以增加了一个printStyle函数，scanStyles默认值是true(会导致打印界面的内容奇奇怪怪，还没去了解详细原因哈哈哈哈)

<script lang="ts" setup>
import { ref,reactive,nextTick } from 'vue';
import { TbProduceOrderNoInfo } from '/@/api-services';
import printJS from 'print-js';
import moment from 'moment';
const props=defineProps({
    title:String
})

const state=reactive({
    isShowDialog:false,
    Datas:[] as Array<TbProduceOrderNoInfo>,
})

const emits = defineEmits(['handleQuery']);
const closeDialog=()=>{
    emits('handleQuery');
    state.isShowDialog=false;
}

const cancel=()=>{
    state.isShowDialog=false;
    closeDialog();
}

//预览+打印
const openDialog=async(row:any)=>{
   
   state.Datas=JSON.parse(JSON.stringify(row));

   state.isShowDialog=true;
}

const print=()=>{
   for(var i=0;i<state.Datas.length;i++){
      printJS({printable:`${state.Datas[i].id}`,type:"html",style:printStyle(),scanStyles:false})
   }
}

//直接打印不预览
const printrow=async(row:any)=>{
    state.Datas=JSON.parse(JSON.stringify(row));
    state.isShowDialog=true;
    //主界面form DOM加载完成
    nextTick(()=>{
            //弹窗加载完成
            nextTick(()=>{
                printJS({printable:`${state.Datas[0].id}`,type:"html",style:printStyle(),scanStyles:false})
                state.isShowDialog=false;
            })
        })
}

//打印界面的CSS样式
const printStyle=()=>{
    return `
.labelHeadBody{
    display: flex;justify-content:space-between;margin: 0; font-size: 16px;width: 100%; height:45px
}
.labelHeadBodyLeftHead{
    width: 30px;
}
.labelHeadBodyRightHead{
    width: 250px; height: 70px;display: flex;justify-content: center;
}
.lableBodytdrightfont{
    font-size:10px
}
.labelHeadBodyRightHeadTd{
    padding: 0;
    font-size: 14px;
    font-weight: bold;
    text-align: center;
    vertical-align: middle;
}
.labelBody{
    margin-left: 5px;
    margin-right: 5px;
}
.lableBodytdleft{
    width: 30%;
    font-weight: bold;
    vertical-align: bottom;
   
}

.lableBodytdright{
    width: 70%; 
    border-bottom: 1px solid;
}
.labelHeadBodyLeftHeadimage{
    width: 70px; height: 40px
}
.tableHead{
    height: 20px;
}
    `;
}



//预览、直接打印
defineExpose({openDialog,printrow})
</script>

标签前端样式代码：

<style>
.labelHeadBody{
    display: flex;justify-content:space-between;margin: 0; font-size: 16px;width: 100%;
}
.labelHeadBodyLeftHead{
    width: 30px;
}
.labelHeadBodyRightHead{
    width: 250px; height: 70px;display: flex;justify-content: center;
}

.labelHeadBodyRightHeadTd{
    padding: 0;
    font-size: 14px;
    font-weight: bold;
    text-align: center;
    vertical-align: middle;
}
.labelBody{
    margin-top: 10px;
    margin-left: 5px;
    margin-right: 5px;
}
.lableBodytdleft{
    width: 30%;
    font-weight: bold;
    vertical-align: bottom;
   
}
.lableBodytdright{
    width: 75%; 
    border-bottom: 1px solid;
}
.labelHeadBodyLeftHeadimage{
    width: 80px; height: 55px
}
.tableHead{
    height: 20px;
}
</style>

最后，如果需要带二维码的同学可以添加qrcode组件，以下是简单的实现（el-image、img标签中图片不显示的问题还没解决，迂回操作直接把生成的二维码图片设置成控件背景来处理，囧.........）：

<template #default="scope">
                         <div :style="createQrcode(scope.row.eqNo)" ></div>
                          <!-- <el-image :scr="createQrcode1(scope.row.eqNo)" style="width: 60px;height: 60px;"></el-image> -->
</template>


import QRCode from 'qrcode'


//将生成的二维码设置成div的Style，不知道为嘛el-image绑定base64image图片不显示
const createQrcode=(text:string)=>{
    if(text==""||text==undefined||text==null) return "";
    let url1:any;
    url1="";  
    QRCode.toDataURL(text,(err,url)=>{
        if(err){
            console.error(err);
        }
        else{
            url1=url;
        }
    })
    return `background-image: url(${url1});background-position: center center;background-size: contain;background-repeat: no-repeat;;width:100%;height:60px`;
}