在开发Web应用时，打印是必不可少的环节之一，例如客户的销售订单、采购订单之类的单据需要打印出来，
今天分享一款免费的Web打印控件Lodop，它由Lodop插件及CLodop服务组成，官网下载地址：http://www.lodop.net
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下载完成后安装CLodop_Setup_for_Win32NT.exe和install_lodop64.exe（或install_lodop32.exe）后，就可以使用了。
官方基础指令：
PRINT_INIT(strPrintTaskName)打印初始化
SET_PRINT_PAGESIZE(intOrient,intPageWidth,intPageHeight,strPageName)设定纸张大小
ADD_PRINT_HTM(intTop,intLeft,intWidth,intHeight,strHtml)增加超文本项
ADD_PRINT_TEXT(intTop,intLeft,intWidth,intHeight,strContent)增加纯文本项
ADD_PRINT_TABLE(intTop,intLeft,intWidth,intHeight,strHtml)增加表格项
ADD_PRINT_SHAPE(intShapeType,intTop,intLeft,intWidth,intHeight,intLineStyle,intLineWidth,intColor)画图形
SET_PRINT_STYLE(strStyleName,varStyleValue)设置对象风格
PREVIEW打印预览
PRINT直接打印
PRINT_SETUP打印维护
PRINT_DESIGN打印设计
最基本的打印过程至少有初始化语句、添内容语句和打印语句三部分组成，例如：
//首先一个初始化语句
LODOP.PRINT_INIT("打印任务名");
//然后多个ADD语句及SET语句
LODOP.ADD_PRINT_TEXT(0,0,100,20,"文本内容一");
//最后一个打印(或预览、维护、设计)语句
LODOP.PRINT();
现在介绍综合表格打印的演示示例：
//CLodop服务默认占用8000端口和18000端口
//==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(/WindowssPhone/i))
return true;
if (ua.match(/iPhone|iPod|iPad/i))
return true;
if (ua.match(/Android/i))
return true;
if (ua.match(/EdgeD?d+/i))
return true;
var verTrident = ua.match(/TridentD?d+/i);
var verIE = ua.match(/MSIED?d+/i);
var verOPR = ua.match(/OPRD?d+/i);
var verFF = ua.match(/FirefoxD?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(/ChromeD?d+/i);
if (verChrome) {
verChrome = verChrome[0].match(/d+/);
if (verChrome[0] >= 41)
return true;
}
}
return false;
} catch (err) {
return true;
}
}
//==加载引用CLodop的主JS,用双端口8000和18000(以防其中一个被占):==
function loadCLodop() {
if (CLodopJsState == "loading" || CLodopJsState == "complete") return;
CLodopJsState = "loading";
var head = document.head || document.getElementsByTagName("head")[0] || document.documentElement;
var JS1 = document.createElement("script");
var JS2 = document.createElement("script");
JS1.src = "http://localhost:8000/CLodopfuncs.js?priority=1";
JS2.src = "http://localhost:18000/CLodopfuncs.js";
JS1.onload = JS2.onload = function () { CLodopJsState = "complete"; }
JS1.onerror = JS2.onerror = function (evt) { CLodopJsState = "complete"; }
head.insertBefore(JS1, head.firstChild);
head.insertBefore(JS2, head.firstChild);
CLodopIsLocal = !!((JS1.src + JS2.src).match(///localho|//127.0.0./i));
}
if (needCLodop()) { loadCLodop(); }//加载
//==获取LODOP对象主过程,判断是否安装、需否升级:==
function getLodop(oOBJECT, oEMBED) {
... ...
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 && CLodopJsState !== "complete") {
if (CLodopJsState == "loading") alert("网页还没下载完毕，请稍等一下再操作."); else alert("没有加载CLodop的主js，请先调用loadCLodop过程.");
return;
}
if (!LODOP) {
document.body.innerHTML = strCLodopInstall_1 + (CLodopIsLocal ? strCLodopInstall_2 : "") + strCLodopInstall_3 + document.body.innerHTML;
return;
} else {
if (CLODOP.CVERSION < "4.1.2.7") {
document.body.innerHTML = strCLodopUpdate + document.body.innerHTML;
}
if (oEMBED && oEMBED.parentNode)
oEMBED.parentNode.removeChild(oEMBED); //清理旧版无效元素
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,否则新建:==
if (oOBJECT || oEMBED) {
if (isIE)
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 (isIE)
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)) {
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):
//========================================
return LODOP;
} catch (err) {
alert("getLodop出错:" + err);
}
}
//组装一个要打印的html字符串
var divTest =
"<TABLE border=0 cellSpacing=0 cellPadding=0 width="100% ">" +
"<TBODY style="font-size: 12px">" +
"<TR>" +
"<TD width="25%" height="22">发货工厂：</TD>" +
"<TD width="25%">物流商：</TD>" +
"<TD width="25%">车牌号：</TD>" +
"<TD width="25%">实收总件数：</TD>" +
"</TR>" +
... +
"</TBODY>"
"</TABLE >";
//调用LODOP打印插件
LODOP = getLodop(); //获取LODOP对象
LODOP.SET_PRINT_STYLE("FontSize", 9); //设置字体
LODOP.PRINT_INIT("test"); //初始化
LODOP.ADD_PRINT_HTM(30, "8%", "86%", 1050, divTest); //打印主体
LODOP.ADD_PRINT_HTM(1100, 700, 300, 100, "<font color='#000' format='#'><span tdata='pageNO'>第##页</span>/<span tdata='pageCount'>共##页</span></font>"); //页脚
LODOP.SET_PRINT_STYLEA(0, "ItemType", 1);
LODOP.SET_PRINT_STYLEA(0, "Horient", 1);
LODOP.PREVIEW(); //插件预览
看看预览效果：
打印之后的pdf：
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由于篇幅有限，本文只介绍了表格的打印，还有其他强大的功能例如公章打印、话费缴费回执单打印等 待大家去探索。
