php 如何通过代码调整打印选项？
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How to adjust print options through code?
提问by Amol Chakane
I have a ticket booking system in Joomla.
我在 Joomla 有一个订票系统。
When user clicks on ticket link a ticket is shown on the site.
当用户单击票证链接时，网站上会显示票证。
I am using a barcode.phpfile to generate the barcode image for ticket number.
我正在使用一个barcode.php文件来生成票号的条形码图像。
Now there are 2 scenarios I used to print ticket.
现在有两个场景我用来打印票。
When I print that ticket using
window.print()or Ctrl+P, 2 pages get printed even though my ticket content is only single page.When I use following javascript code to print specific part of the page, barcode image is not generated.
function print_specific_div_content(){ var content = "<html>"; content += document.getElementById("divToPrint").innerHTML ; content += "</body>"; content += "</html>"; var printWin = window.open('','','left=0,top=0,width=552,height=477,toolbar=0,scrollbars=0,status =0'); printWin.document.write(content); printWin.document.close(); printWin.focus(); printWin.print(); printWin.close(); }
当我使用
window.print()或Ctrl+P打印该票证时，即使我的票证内容只有单页，也会打印 2 页。当我使用以下 javascript 代码打印页面的特定部分时，不会生成条形码图像。
function print_specific_div_content(){ var content = "<html>"; content += document.getElementById("divToPrint").innerHTML ; content += "</body>"; content += "</html>"; var printWin = window.open('','','left=0,top=0,width=552,height=477,toolbar=0,scrollbars=0,status =0'); printWin.document.write(content); printWin.document.close(); printWin.focus(); printWin.print(); printWin.close(); }
My requirements are:
我的要求是：
Ticket should be printed only on single page.
票只应打印在单页上。
Any help or suggestion will be appreciated.
任何帮助或建议将不胜感激。
Thanks.
谢谢。
EDIT 1 :
编辑 1：
I modified my function as follow, but unfortunately it shows new window but no print dialog. :(
我修改了我的函数如下，但不幸的是它显示了新窗口但没有打印对话框。:(
function print_specific_div_content(){
var win = window.open('','','left=0,top=0,width=552,height=477,toolbar=0,scrollbars=0,status =0');
var handler = function() {
win.print();
win.close();
};
if(win.addEventListener)
win.addEventListener('load', handler, false);
else if(win.attachEvent)
win.attachEvent('onload', handler, false);
var content = "<html>";
content += document.getElementById("divToPrint").innerHTML ;
content += "</body>";
content += "</html>";
win.document.write(content);
win.document.close();
}
回答by Dark Falcon
When printing just the content, you need to wait for the document to load before printing so that the images will be loaded:
仅打印内容时，您需要等待文档加载后再打印，以便加载图像：
function print_specific_div_content(){
var win = window.open('','','left=0,top=0,width=552,height=477,toolbar=0,scrollbars=0,status =0');
var content = "<html>";
content += "<body onload=\"window.print(); window.close();\">";
content += document.getElementById("divToPrint").innerHTML ;
content += "</body>";
content += "</html>";
win.document.write(content);
win.document.close();
}
