欢迎关注微信公众号:【 全栈攻略 】

众所周知,前端打印的API只有window.print(),而我们要实现自动打印和批量打印,甚至连获取本地电脑的打印机有哪些都无法获取到。难道,前端对此真的无能为力吗?答案是 否定

Lodop 由此诞生,有人说她是Web打印控件的“终结者”,因为接触“她”后再不想别的“她”。 那我们就来揭开这神秘都面纱!

一,首先我们要改造Lodpo的源代码文件为适合Vue/React/Angular等框架如下:

LodopFuncs.js

var CreatedOKLodop7766 = null, CLodopIsLocal;

//====判断是否需要 Web打印服务CLodop:===
//===(不支持插件的浏览器版本需要用它)===
export function needCLodop() {
    try {
        var ua = navigator.userAgent;
        if (ua.match(/Windows\sPhone/i))
            return true;
        if (ua.match(/iPhone|iPod|iPad/i))
            return true;
        if (ua.match(/Android/i))
            return true;
        if (ua.match(/Edge\D?\d+/i))
            return true;

        var verTrident = ua.match(/Trident\D?\d+/i);
        var verIE = ua.match(/MSIE\D?\d+/i);
        var verOPR = ua.match(/OPR\D?\d+/i);
        var verFF = ua.match(/Firefox\D?\d+/i);
        var x64 = ua.match(/x64/i);
        if ((!verTrident) && (!verIE) && (x64))
            return true;
        else if (verFF) {
            verFF = verFF[0].match(/\d+/);
            if ((verFF[0] >= 41) || (x64))
                return true;
        } else if (verOPR) {
            verOPR = verOPR[0].match(/\d+/);
            if (verOPR[0] >= 32)
                return true;
        } else if ((!verTrident) && (!verIE)) {
            var verChrome = ua.match(/Chrome\D?\d+/i);
            if (verChrome) {
                verChrome = verChrome[0].match(/\d+/);
                if (verChrome[0] >= 41)
                    return true;
            }
        }
        return false;
    } catch (err) {
        return true;
    }
}

//====页面引用CLodop云打印必须的JS文件,用双端口(8000和18000)避免其中某个被占用:====
if (needCLodop()) {
    var src1 = "http://localhost:8000/CLodopfuncs.js?priority=1";
    var src2 = "http://localhost:18000/CLodopfuncs.js?priority=0";

    var head = document.head || document.getElementsByTagName("head")[0] || document.documentElement;
    var oscript = document.createElement("script");
    oscript.src = src1;
    head.insertBefore(oscript, head.firstChild);
    oscript = document.createElement("script");
    oscript.src = src2;
    head.insertBefore(oscript, head.firstChild);
    CLodopIsLocal = !!((src1 + src2).match(/\/\/localho|\/\/127.0.0./i));
}

//====获取LODOP对象的主过程:====
export function getLodop(oOBJECT, oEMBED) {
    var strHtmInstall = "<br><font color='#FF00FF'>打印控件未安装!点击这里<a href='install_lodop32.exe' target='_self'>执行安装</a>,安装后请刷新页面或重新进入。</font>";
    var strHtmUpdate = "<br><font color='#FF00FF'>打印控件需要升级!点击这里<a href='install_lodop32.exe' target='_self'>执行升级</a>,升级后请重新进入。</font>";
    var strHtm64_Install = "<br><font color='#FF00FF'>打印控件未安装!点击这里<a href='install_lodop64.exe' target='_self'>执行安装</a>,安装后请刷新页面或重新进入。</font>";
    var strHtm64_Update = "<br><font color='#FF00FF'>打印控件需要升级!点击这里<a href='install_lodop64.exe' target='_self'>执行升级</a>,升级后请重新进入。</font>";
    var strHtmFireFox = "<br><br><font color='#FF00FF'>(注意:如曾安装过Lodop旧版附件npActiveXPLugin,请在【工具】->【附加组件】->【扩展】中先卸它)</font>";
    var strHtmChrome = "<br><br><font color='#FF00FF'>(如果此前正常,仅因浏览器升级或重安装而出问题,需重新执行以上安装)</font>";
    var strCLodopInstall_1 = "<br><font color='#FF00FF'>Web打印服务CLodop未安装启动,点击这里<a href='CLodop_Setup_for_Win32NT.exe' target='_self'>下载执行安装</a>";
    var strCLodopInstall_2 = "<br>(若此前已安装过,可<a href='CLodop.protocol:setup' target='_self'>点这里直接再次启动</a>)";
    var strCLodopInstall_3 = ",成功后请刷新本页面。</font>";
    var strCLodopUpdate = "<br><font color='#FF00FF'>Web打印服务CLodop需升级!点击这里<a href='CLodop_Setup_for_Win32NT.exe' target='_self'>执行升级</a>,升级后请刷新页面。</font>";
    var LODOP;
    try {
        var ua = navigator.userAgent;
        var isIE = !!(ua.match(/MSIE/i)) || !!(ua.match(/Trident/i));
        if (needCLodop()) {
            try {
                LODOP = getCLodop();
            } catch (err) {}
            if (!LODOP && document.readyState !== "complete") {
                alert("网页还没下载完毕,请稍等一下再操作.");
                return;
            }
            if (!LODOP) {
                //document.body.innerHTML = strCLodopInstall_1 + (CLodopIsLocal ? strCLodopInstall_2 : "") + strCLodopInstall_3 + document.body.innerHTML;                
                return;
            } else {
                if (CLODOP.CVERSION < "3.0.8.3") {
                    document.body.innerHTML = strCLodopUpdate + document.body.innerHTML;
                }
                if (oEMBED && oEMBED.parentNode)
                    oEMBED.parentNode.removeChild(oEMBED);
                if (oOBJECT && oOBJECT.parentNode)
                    oOBJECT.parentNode.removeChild(oOBJECT);
            }
        } else {
            var is64IE = isIE && !!(ua.match(/x64/i));
            //=====如果页面有Lodop就直接使用,没有则新建:==========
            if (oOBJECT || oEMBED) {
                if (isIE)
                    LODOP = oOBJECT;
                else
                    LODOP = oEMBED;
            } else if (!CreatedOKLodop7766) {
                LODOP = document.createElement("object");
                LODOP.setAttribute("width", 0);
                LODOP.setAttribute("height", 0);
                LODOP.setAttribute("style", "position:absolute;left:0px;top:-100px;width:0px;height:0px;");
                if (isIE)
                    LODOP.setAttribute("classid", "clsid:2105C259-1E0C-4534-8141-A753534CB4CA");
                else
                    LODOP.setAttribute("type", "application/x-print-lodop");
                document.documentElement.appendChild(LODOP);
                CreatedOKLodop7766 = LODOP;
            } else
                LODOP = CreatedOKLodop7766;
            //=====Lodop插件未安装时提示下载地址:==========
            if ((!LODOP) || (!LODOP.VERSION)) {
                if (ua.indexOf('Chrome') >= 0)
                    document.body.innerHTML = strHtmChrome + document.body.innerHTML;
                if (ua.indexOf('Firefox') >= 0)
                    document.body.innerHTML = strHtmFireFox + document.body.innerHTML;
                document.body.innerHTML = (is64IE ? strHtm64_Install : strHtmInstall) + document.body.innerHTML;
                return LODOP;
            }
        }
        if (LODOP.VERSION < "6.2.2.6") {
            if (!needCLodop())
                document.body.innerHTML = (is64IE ? strHtm64_Update : strHtmUpdate) + document.body.innerHTML;
        }
        //===如下空白位置适合调用统一功能(如注册语句、语言选择等):==

 	// 添加注册码,打印就不会出现 “本页由lodop试用版输出 ”    
    LODOP.SET_LICENSES("","XXXXX","XXXX","");

    //=======================================================
        return LODOP;
    } catch (err) {
        alert("getLodop出错:" + err);
    }
}

二,获取本地电脑连接都有哪些打印机

先上效果图:

在这里插入图片描述
代码如下:

 // 先导入getLodop方法
import { getLodop } from "plugin/LodopFuncs.js";
 // 获取打印机列表
 getPrintList() {
     let LODOP = getLodop();
     if (!LODOP)return
     // 获取打印机个数
     let count = LODOP.GET_PRINTER_COUNT()
     let printValue = LODOP.GET_PRINTER_NAME(-1) //获取默认打印机
     this.printList = Array(count).fill(null).map((...args) => {
         if (printValue === LODOP.GET_PRINTER_NAME(args[1])){
             this.printDefault = args[1]
         }
         return {
             value: args[1], // args[1]为数组索引
             label: LODOP.GET_PRINTER_NAME(args[1]) // 获取打印机名称
         }
     })

 },

三,实现自动打印和批量打印

自动打印没法上效果图了,自己试一下就可以了 ^ _ ^

不过可以上,我们仓储系统的场景图:
在这里插入图片描述

代码如下:

 // 多选
    handleSelectionChange(val) {
      this.multipleSelection = val;
    },
    // 批量打印
    async batchPrint() {
      if(!this.multipleSelection.length){
        this.$utils.commonUtils.tip('请选择','warning')
        return
      }
      for await(const key of this.multipleSelection) {
        this.getPrintData(key.printUrl)
      }
    },
    // 打印
    handleReview(index, row) {
      this.getPrintData(row.printUrl)
    },
   // 获取面单信息数组数据
    async getPrintData(url) {
      if(url) {
       this.printUrlList = url.split(';')
       this.printInfo()
      }
    },
    // 打印面单 
    async printInfo() {
      for await (const item of this.printUrlList) {
        this.printEveryItem(item)
      }
    },
    // 打印每项
    printEveryItem(item) {
      let self = this;
      let LODOP = getLodop(); //调用getLodop获取LODOP对象
      return new Promise(function (resolve) {
        setTimeout(() => {
         LODOP.PRINT_INIT("");
         let strStyleCSS = `<style type='text/css' rel='stylesheet'>.img1{display:block;margin:10px;width:360;height:360}</style>`
         let html = `<head>${strStyleCSS}</head><body><div class='print-card'>
                <img src=${item} class='img1' />
            </div><body>`
         LODOP.ADD_PRINT_HTM(0,0,380,380,html);
         LODOP.SET_PRINT_PAGESIZE(1,1000,1000,"");   
         LODOP.PRINT();
        }, 1000);
      });
    }  
  

单个打印和批量打印实现了,自动打印就简单了,满足条件调用打印方法即可,如仓储系统实际业务需求,当播种完成自动打印

至此,前端实现了自动打印 批量打印功能,更多功能可自行扩展,Lodop 等你探索!

PS:未来的你,一定会感谢今天拼命努力的自己!
Logo

前往低代码交流专区

更多推荐