An example explains how Vue implements printing receipts

Vue can also print receipts? So how to implement it specifically? Let me take you through a detailed understanding of how to print receipts by installing the lodop printing control. This article is attached with detailed example code. I hope it will be helpful to friends who need it. Welcome to learn!

Vue implements printing receipts

lodop printing control

Install lodop printing Control (learning video sharing: vue video tutorial)

lodop地址: http://www.c-lodop.com/download.html

Introduce LodopFuncs.js into the project

//==本JS是加载Lodop插件或Web打印服务CLodop/Lodop7的综合示例，可直接使用，建议理解后融入自己程序==

//用双端口加载主JS文件Lodop.js(或CLodopfuncs.js兼容老版本)以防其中某端口被占:

var  MainJS  =  "CLodopfuncs.js",

 URL_WS1  =  "ws://localhost:8000/"  +  MainJS,                //ws用8000/18000

 URL_WS2  =  "ws://localhost:18000/"  +  MainJS,

 URL_HTTP1  =  "http://localhost:8000/"  +  MainJS,              //http用8000/18000

 URL_HTTP2  =  "http://localhost:18000/"  +  MainJS,

 URL_HTTP3  =  "https://localhost.lodop.net:8443/"  +  MainJS; //https用8000/8443

var  CreatedOKLodopObject, CLodopIsLocal, LoadJsState;

//==判断是否需要CLodop(那些不支持插件的浏览器):==

export  function  needCLodop() {

 try {

 var  ua  =  navigator.userAgent;

 if (ua.match(/Windows\sPhone/i) ||

 ua.match(/iPhone|iPod|iPad/i) ||

 ua.match(/Android/i) ||

 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;

    }

}

//==检查加载成功与否，如没成功则用http(s)再试==

//==低版本CLODOP6.561/Lodop7.043及前)用本方法==

export  function  checkOrTryHttp() {

 if (window.getCLodop) {

 LoadJsState  =  "complete";

 return  true;

    }

 if (LoadJsState  ==  "loadingB"  ||  LoadJsState  ==  "complete") return;

 LoadJsState  =  "loadingB";

 var  head  =  document.head  ||  document.getElementsByTagName("head")[0] ||  document.documentElement;

 var  JS1  =  document.createElement("script")

, JS2  =  document.createElement("script")

, JS3  =  document.createElement("script");

 JS1.src  =  URL_HTTP1;

 JS2.src  =  URL_HTTP2;

 JS3.src  =  URL_HTTP3;

 JS1.onload  =  JS2.onload  =  JS3.onload  =  JS2.onerror  =  JS3.onerror  =  function () { LoadJsState  =  "complete"; }

 JS1.onerror  =  function (e) {

 if (window.location.protocol  !==  'https:')

 head.insertBefore(JS2, head.firstChild); else

 head.insertBefore(JS3, head.firstChild);

    }

 head.insertBefore(JS1, head.firstChild);

}

//==加载Lodop对象的主过程:==

(function  loadCLodop() {

 if (!needCLodop()) return;

 CLodopIsLocal  =  !!((URL_WS1  +  URL_WS2).match(/\/\/localho|\/\/127.0.0./i));

 LoadJsState  =  "loadingA";

 if (!window.WebSocket  &&  window.MozWebSocket) window.WebSocket  =  window.MozWebSocket;

 //ws方式速度快(小于200ms)且可避免CORS错误,但要求Lodop版本足够新:

 try {

 var  WSK1  =  new  WebSocket(URL_WS1);

 WSK1.onopen  =  function (e) { setTimeout("checkOrTryHttp();", 200); }

 WSK1.onmessage  =  function (e) { if (!window.getCLodop) eval(e.data); }

 WSK1.onerror  =  function (e) {

 var  WSK2  =  new  WebSocket(URL_WS2);

 WSK2.onopen  =  function (e) { setTimeout("checkOrTryHttp();", 200); }

 WSK2.onmessage  =  function (e) { if (!window.getCLodop) eval(e.data); }

 WSK2.onerror  =  function (e) { checkOrTryHttp(); }

        }

} catch (e) {

 checkOrTryHttp();

    }

})();

//==获取LODOP对象主过程,判断是否安装、需否升级:==

export  function  getLodop(oOBJECT, oEMBED) {

 var  strFontTag  =  "<br><font color=&#39;#FF00FF&#39;>打印控件";

 var  strLodopInstall  =  strFontTag  +  "未安装!点击这里<a href=&#39;install_lodop32.exe&#39; target=&#39;_self&#39;>执行安装</a>";

 var  strLodopUpdate  =  strFontTag  +  "需要升级!点击这里<a href=&#39;install_lodop32.exe&#39; target=&#39;_self&#39;>执行升级</a>";

 var  strLodop64Install  =  strFontTag  +  "未安装!点击这里<a href=&#39;install_lodop64.exe&#39; target=&#39;_self&#39;>执行安装</a>";

 var  strLodop64Update  =  strFontTag  +  "需要升级!点击这里<a href=&#39;install_lodop64.exe&#39; target=&#39;_self&#39;>执行升级</a>";

 var  strCLodopInstallA  =  "<br><font color=&#39;#FF00FF&#39;>Web打印服务CLodop未安装启动，点击这里<a href=&#39;CLodop_Setup_for_Win32NT.exe&#39; target=&#39;_self&#39;>下载执行安装</a>";

 var  strCLodopInstallB  =  "<br>（若此前已安装过，可<a href=&#39;CLodop.protocol:setup&#39; target=&#39;_self&#39;>点这里直接再次启动</a>）";

 var  strCLodopUpdate  =  "<br><font color=&#39;#FF00FF&#39;>Web打印服务CLodop需升级!点击这里<a href=&#39;CLodop_Setup_for_Win32NT.exe&#39; target=&#39;_self&#39;>执行升级</a>";

 var  strLodop7FontTag  =  "<br><font color=&#39;#FF00FF&#39;>Web打印服务Lodop7";

 var  strLodop7HrefX86  =  "点击这里<a href=&#39;Lodop7_Linux_X86_64.tar.gz&#39; target=&#39;_self&#39;>下载安装</a>(下载后解压，点击lodop文件开始执行)";

 var  strLodop7HrefARM  =  "点击这里<a href=&#39;Lodop7_Linux_ARM64.tar.gz&#39;  target=&#39;_self&#39;>下载安装</a>(下载后解压，点击lodop文件开始执行)";

 var  strLodop7Install_X86  =  strLodop7FontTag  +  "未安装启动，"  +  strLodop7HrefX86;

 var  strLodop7Install_ARM  =  strLodop7FontTag  +  "未安装启动，"  +  strLodop7HrefARM;

 var  strLodop7Update_X86  =  strLodop7FontTag  +  "需升级，"  +  strLodop7HrefX86;

 var  strLodop7Update_ARM  =  strLodop7FontTag  +  "需升级，"  +  strLodop7HrefARM;

 var  strInstallOK  =  "，成功后请刷新本页面或重启浏览器。</font>";

 var  LODOP;

 try {

 var  isWinIE  = (/MSIE/i.test(navigator.userAgent)) || (/Trident/i.test(navigator.userAgent));

 var  isWinIE64  =  isWinIE  && (/x64/i.test(navigator.userAgent));

 var  isLinuxX86  = (/Linux/i.test(navigator.platform)) && (/x86/i.test(navigator.platform));

 var  isLinuxARM  = (/Linux/i.test(navigator.platform)) && (/aarch/i.test(navigator.platform));

 if (needCLodop() ||  isLinuxX86  ||  isLinuxARM) {

 try {

 LODOP  = window.getCLodop();

} catch (err) { }

 if (!LODOP  &&  LoadJsState  !==  "complete") {

 if (!LoadJsState)

 alert("未曾加载Lodop主JS文件，请先调用loadCLodop过程."); else

 alert("网页还没下载完毕，请稍等一下再操作.");

 return;

            }

 var  strAlertMessage;

 if (!LODOP) {

 if (isLinuxX86)

 strAlertMessage  =  strLodop7Install_X86;

 else  if (isLinuxARM)

 strAlertMessage  =  strLodop7Install_ARM;

 else

 strAlertMessage  =  strCLodopInstallA  + (CLodopIsLocal  ?  strCLodopInstallB  :  "");

 document.body.innerHTML = strAlertMessage + strInstallOK + document.body.innerHTML;

 return;

} else {

 if (isLinuxX86  &&  LODOP.CVERSION <  "7.0.4.3")

 strAlertMessage  =  strLodop7Update_X86;

 else  if (isLinuxARM  &&  LODOP.CVERSION <  "7.0.4.3")

 strAlertMessage  =  strLodop7Update_ARM;

 else  if (CLODOP.CVERSION <  "6.5.7.0")

 strAlertMessage  =  strCLodopUpdate;

 if (strAlertMessage)

 document.body.innerHTML  =  strAlertMessage  +  strInstallOK  +  document.body.innerHTML;

            }

} else {

 //==如果页面有Lodop插件就直接使用,否则新建:==

 if (oOBJECT  ||  oEMBED) {

 if (isWinIE)

 LODOP  = oOBJECT;

 else

 LODOP  =  oEMBED;

} else  if (!CreatedOKLodopObject) {

 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 (isWinIE)

 LODOP.setAttribute("classid", "clsid:2105C259-1E0C-4534-8141-A753534CB4CA");

 else

 LODOP.setAttribute("type", "application/x-print-lodop");

 document.documentElement.appendChild(LODOP);

 CreatedOKLodopObject  =  LODOP;

} else

 LODOP  =  CreatedOKLodopObject;

 //==Lodop插件未安装时提示下载地址:==

 if ((!LODOP) || (!LODOP.VERSION)) {

 document.body.innerHTML  = (isWinIE64  ?  strLodop64Install  :  strLodopInstall) +  strInstallOK  +  document.body.innerHTML;

 return  LODOP;

            }

 if (LODOP.VERSION <  "6.2.2.6") {

 document.body.innerHTML  = (isWinIE64  ?  strLodop64Update  :  strLodopUpdate) +  strInstallOK  +  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):=======================

 //===============================================================================

 return  LODOP;

} catch (err) {

 alert("getLodop出错:"  +  err);

    }

}

Remove the test Version

myPreview1() {

 // this.CreateImage();

 // this.LODOP.PRINT();

 let  LODOP  =  getLodop();

 console.log(' LODOP', LODOP)

 var  strHTML  =  document.getElementById("box").innerHTML;

 LODOP.PRINT_INIT("")

 LODOP.SET_LICENSES("", "EE0887D00FCC7D29375A695F728489A6", "C94CEE276DB2187AE6B65D56B3FC2848", ""); //去掉测试版本

 // LODOP.SET_PRINT_PAGESIZE(3, "80mm", "10mm", "CreateCustomPage"); //80打印机不需要加这行

 LODOP.SET_PRINT_STYLE("FontSize", 15); // 设置打印字体

 LODOP.SET_PRINT_STYLE("Bold", 1); // 设置加粗

 LODOP.SET_PRINT_MODE("PRINT_PAGE_PERCENT", "Height:90%");

 LODOP.SET_PRINT_MODE("PRINT_PAGE_PERCENT", "Full-Width");

 LODOP.ADD_PRINT_HTM(10, 10, "90%", "70%", strHTML);

 LODOP.PRINT();//

 // this.LODOP.PREVIEW()

        },

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