web 页面分页打印的实现

1.首先引入一个WebBrowser在需要打印的页面,可以直接添加:

  

复制代码 代码如下:

  <object id="WebBrowser" classid=CLSID:8856F961-340A-11D0-A96B-00C04FD705A2 height="0" width="0">

  </object>

  到页面,或者使用JavaScript在需要的时候临时添加也可以:

  

复制代码 代码如下:

  document.body.insertAdjacentHTML("beforeEnd",

  "<object id=\"WebBrowser\" width=0 height=0 \

  classid=\"clsid:8856F961-340A-11D0-A96B-00C04FD705A2\">");

  2 .页面设置和打印预览

  如下所示,直接调用即可

  

复制代码 代码如下:

  document.all.WebBrowser.ExecWB(6,6) 直接打印

  document.all.WebBrowser.ExecWB(8,1) 页面设置

  document.all.WebBrowser.ExecWB(7,1) 打印预览

  或者:

  

复制代码 代码如下:

  execScript("document.all.WebBrowser.ExecWB 7, 1","VBScript");

  3 隐藏不打印的页面元素和分页

  CSS 有个Media 属性,可以分开设置打印和显示的格式。

  如 <style media="print" type="text/css"> …</style> 中间的格式将只在打印时起作用,不会影响显示界面。

  所以可以设定

  <style media="print" type="text/css">

  .Noprint{display:none;}

  .PageNext{page-break-after: always;}

  </style>

  然后给不想打印的页面元素添加: class="Noprint" ,那就不会出现在打印和打印预览中了。

  想分页的地方添加: <div class="PageNext"></div> 就可以了。

  4.打印页面的特定部分

  通过将需要打印的特定部分另建一个页面,然后装入主页面的一个IFrame中,再调用IFrame的打印方法,只打印IFrame中的内容实现的。

  如:

  <iframe style="visibility: visible" name="FrameId" width="100%" height="30%" src="NeedPrintedPage.asp"></iframe>

  下面的pringFrame js函数将只打印Iframe中的内容,可以直接引用使用,如printFrame(FrameId);

  

复制代码 代码如下:

  window.print = printFrame;

  // main stuff

  function printFrame(frame, onfinish) {

  if ( !frame ) frame = window;

  function execOnFinish() {

  switch ( typeof(onfinish) ) {

  case "string": execScript(onfinish); break;

  case "function": onfinish();

  }

  if ( focused && !focused.disabled ) focused.focus();

  }

  if (( frame.document.readyState !== "complete") &&( !frame.document.confirm("The document to print is not downloaded yet! Continue with printing?") ))

  {

  execOnFinish();

  return;

  }

  var eventScope = printGetEventScope(frame);

  var focused = document.activeElement;

  window.printHelper = function() {

  execScript("on error resume next: printWB.ExecWB 6, 1", "VBScript");

  printFireEvent(frame, eventScope, "onafterprint");

  printWB.outerHTML = "";

  execOnFinish();

  window.printHelper = null;

  }

  document.body.insertAdjacentHTML("beforeEnd",

  "<object id=\"printWB\" width=0 height=0 \

  classid=\"clsid:8856F961-340A-11D0-A96B-00C04FD705A2\">");

  printFireEvent(frame, eventScope, "onbeforeprint");

  frame.focus();

  window.printHelper = printHelper;

  setTimeout("window.printHelper()", 0);

  }

  // helpers

  function printIsNativeSupport() {

  var agent = window.navigator.userAgent;

  var i = agent.indexOf("MSIE ")+5;

  return parseInt(agent.substr(i)) >= 5 && agent.indexOf("5.0b1") < 0;

  }

  function printFireEvent(frame, obj, name) {

  var handler = obj[name];

  switch ( typeof(handler) ) {

  case "string": frame.execScript(handler); break;

  case "function": handler();

  }

  }

  function printGetEventScope(frame) {

  var frameset = frame.document.all.tags("FRAMESET");

  if ( frameset.length ) return frameset[0];

  return frame.document.body;

  }

  Iframe中所装载页面的打印效果在所装载页面设置就可以了,如分页等。

  5.后台打印

  通过建一个隐藏Iframe实现的,当然仍然会有页面装载的过程。

  下面的函数创建Iframe装载页面并打印。如 printHidden(url) //url为页面地址

  function printHidden(url) {

  document.body.insertAdjacentHTML("beforeEnd",

  "<iframe name=printHiddenFrame width=0 height=0></iframe>");

  var doc = printHiddenFrame.document;

  doc.open();

  doc.write("<body onload=\"parent.onprintHiddenFrame()\">");

  doc.write("<iframe name=printMe width=0 height=0 src=\"" +

  url + "\"></iframe>");

  doc.write("</body>");

  doc.close();

  }

  function onprintHiddenFrame() {

  function onfinish() {

  printHiddenFrame.outerHTML = "";

  if ( window.onprintcomplete ) window.onprintcomplete();

  }

  printFrame(printHiddenFrame.printMe, onfinish);

  }

  它用到了printFrame,所以别忘了引用前面的函数。

  以下为demo:

  <html>

  <head>

  <title>报表</title>

  <object id="WebBrowser"

  classid=CLSID:8856F961-340A-11D0-A96B-00C04FD705A2 height="0"

  width="0">

  </object>

  <style media="print" type="text/css">

  .Noprint{display:none;}

  .PageNext{page-break-after: always;}

  </style>

  </head>

  <body>

  <div class="Noprint">

  <input type="button" value="print"

  onclick="document.all.WebBrowser.ExecWB(6,6)">

  <input type="button" value="printset"

  onclick="document.all.WebBrowser.ExecWB(8,1)">

  <input type="button" value="view"

  onclick="document.all.WebBrowser.ExecWB(7,1)">

  <input type="button" value="frame"

  onclick="printHidden(FrameId)">

  </div>

  <div class="PageNext">

  1

  </div>

  <div class="PageNext">

  2

  </div>

  <iframe style="visibility: visible" diplay="none"name="FrameId" width="100%"

  height="30%" src="2.html"></iframe>

  </body>

  </html>

  <script type="text/javascript">

  window.print = printFrame;

  // main stuff

  function printFrame(frame, onfinish) {

  if ( !frame ) frame = window;

  function execOnFinish() {

  switch ( typeof(onfinish) ) {

  case "string": execScript(onfinish); break;

  case "function": onfinish();

  }

  if ( focused && !focused.disabled ) focused.focus();

  }

  if (( frame.document.readyState !== "complete") &&( !frame.document.confirm("The document to print is not downloaded yet! Continue with printing?") ))

  {

  execOnFinish();

  return;

  }

  var eventScope = printGetEventScope(frame);

  var focused = document.activeElement;

  window.printHelper = function() {

  execScript("on error resume next: printWB.ExecWB 6, 1", "VBScript");

  printFireEvent(frame, eventScope, "onafterprint");

  printWB.outerHTML = "";

  execOnFinish();

  window.printHelper = null;

  }

  document.body.insertAdjacentHTML("beforeEnd",

  "<object id=\"printWB\" width=0 height=0 \

  classid=\"clsid:8856F961-340A-11D0-A96B-00C04FD705A2\">");

  printFireEvent(frame, eventScope, "onbeforeprint");

  frame.focus();

  window.printHelper = printHelper;

  setTimeout("window.printHelper()", 0);

  }

  // helpers

  function printIsNativeSupport() {

  var agent = window.navigator.userAgent;

  var i = agent.indexOf("MSIE ")+5;

  return parseInt(agent.substr(i)) >= 5 && agent.indexOf("5.0b1") < 0;

  }

  function printFireEvent(frame, obj, name) {

  var handler = obj[name];

  switch ( typeof(handler) ) {

  case "string": frame.execScript(handler); break;

  case "function": handler();

  }

  }

  function printGetEventScope(frame) {

  var frameset = frame.document.all.tags("FRAMESET");

  if ( frameset.length ) return frameset[0];

  return frame.document.body;

  }

  function printHidden(url) {

  document.body.insertAdjacentHTML("beforeEnd",

  "<iframe name=printHiddenFrame width=0 height=0></iframe>");

  var doc = printHiddenFrame.document;

  doc.open();

  doc.write("<body onload=\"parent.onprintHiddenFrame()\">");

  doc.write("<iframe name=printMe width=0 height=0 src=\"" +

  url + "\"></iframe>");

  doc.write("</body>");

  doc.close();

  }

  function onprintHiddenFrame() {

  function onfinish() {

  printHiddenFrame.outerHTML = "";

  if ( window.onprintcomplete ) window.onprintcomplete();

  }

  printFrame(printHiddenFrame.printMe, onfinish);

  }

  </script>