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`;
}