TIP
使用window.print
打印,始终都会弹出预览界面,无法实现直接打印功能,最终选择lodop来实现打印功能。现记录使用过程中的一些问题。
这里使用的是通过css html实现样式,直接打印html
按照官网说明,使用外链css,但是无法加载成功
我的解决办法是使用get方法请求css,然后将内容塞进style标签中。
js
var strStyle = ''
// 同步请求css
$.ajax({
url: '/print.css',
type: 'get',
async: false,
success: function(res) {
strStyle = '<style>'+res+'</style>';
}
});
使用小票打印机,打印出来的一点都不清晰
刚开始以为是打印机的问题,调整打印速度为最慢和打印浓度最浓,只比之前好了一点点,但是官网打印又是清晰的。问题出在使用了LODOP.ADD_PRINT_HTML
应该使用LODOP.ADD_PRINT_HTM
。
js
// 尺寸打印时不一定合适,需要根据打印结果来调试
LODOP.ADD_PRINT_HTM(
0,
0,
'94%',
'100%',
strStyle +
"<body>" + printContent + "</body>"
); //上 左 宽度 高度
WARNING
LODOP如果使用预览后打印是可以正常使用的,如果要使用直接打印就需要付费(也不贵最低两百来块)
,否则就会有LODOP的水印。购买后发现打印出来的样式又有一些变化,尴尬!
TIP
打印样式的尺寸应该使用百分比,打印预览样式与实际打印出来的样式不一定一样(目前只发现边界问题),需要根据实际来调整
完整打印代码:
事先引入LodopFuncs.js
,放在最后
js
var LODOP = getLodop();
LODOP.PRINT_INIT("商品标签");
LODOP.SET_PRINT_PAGESIZE(0, 600, 400, 'CreateCustomPage'); // 设定纸张大小
LODOP.SET_PRINT_MODE('Auto-Width');
// 尺寸打印时不一定合适,需要根据打印结果来调试
LODOP.ADD_PRINT_HTM(
0,
0,
'94%',
'100%',
strStyle +
"<body>" + printContent + "</body>"
); //上 左 宽度 高度
// 直接打印需购买,否则会有水印
LODOP.PRINT();
// LODOP.PREVIEW();
js
// LodopFuncs.js
//==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):==
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==
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:==
function getLodop(oOBJECT, oEMBED) {
var strFontTag = "<br><font color='#FF00FF'>打印控件";
var strLodopInstall = strFontTag + "未安装!点击这里<a href='install_lodop32.zip' target='_self'>执行安装</a>";
var strLodopUpdate = strFontTag + "需要升级!点击这里<a href='install_lodop32.zip' target='_self'>执行升级</a>";
var strLodop64Install = strFontTag + "未安装!点击这里<a href='install_lodop64.zip' target='_self'>执行安装</a>";
var strLodop64Update = strFontTag + "需要升级!点击这里<a href='install_lodop64.zip' target='_self'>执行升级</a>";
var strCLodopInstallA = "<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.zip' target='_self'>下载执行安装</a>";
var strCLodopInstallB = "<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 strCLodopUpdate = "<br><font color='#FF00FF'>Web打印服务CLodop需升级!点击这里<a href='CLodop_Setup_for_Win32NT.zip' target='_self'>执行升级</a>";
var strLodop7FontTag = "<br><font color='#FF00FF'>Web打印服务Lodop7";
var strLodop7HrefX86 = "点击这里<a href='Lodop7_Linux_X86_64.tar.gz' target='_self'>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='Lodop7_Linux_ARM64.tar.gz' target='_self'>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 < "6.5.6.7")
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);
}
}
参考连接: