问题
I have a .Net application that dynamically creates a small HTML page and pops it up in a new window using the javascript document.open method. Everything with that functionality is working fine.
Now I want to add a button to the HTML page that prints the page. I have tried using the following code to no avail:
<a href='print.html' onClick='window.print();return false;'>
<img src='images/printer.png' height='32px' width='32px'></a>
When the button is clicked in the popup window, nothing happens. But when the source code of of this page is saved and loaded in a browser as a separate page, the print button works perfectly. So it would appear that the problem is caused by the fact that the code is in a popup window. [The problem now appears to be that the code in written to the popup window after it is opened.] Does anyone know a way to fix this problem or any alternatives?
EDIT:
Other method that I have tried with the same results:
<input type='button' onclick='window.print()' value='Print' />
and
<a href='javascript:window.print()'>
<img src='images/printer.png' height='32px' width='32px'></a>
EDIT AGAIN:
The above code works in Firefox, but not in IE7. Any ideas on a work around for IE?
EDIT YET AGAIN:
Here is a test case using the code that npup posted below. Instead of the code for the popup window living in a separate html file, I am opening a blank url and then writing the code to it. This step appears to be what is causing the problem.
<html>
<head>
<title>main</title>
</head>
<body>
<h1>
Pop & print</h1>
<button onclick="pop();">
Pop</button>
<script type="text/javascript">
var POP;
function pop() {
var newWin = window.open('', 'thePopup', 'width=350,height=350');
newWin.document.write("<html><head><title>popup</title></head><body><h1>Pop</h1>" +
"<p>Print me</p><a href='print.html' onclick='window.print();return false;'>" +
"<img src='images/printer.png' height='32px' width='32px'></a></body></html>");
}
</script>
</body>
</html>
回答1:
Here is a solution that worked for me:
newWin.document.write( newhtml );
newWin.window.location.reload(); // this is the secret ingredient
newWin.focus(); // not sure if this line is necessary
newWin.print();
I'm not 100% sure why this works but I think it has to do with one of the following: (1) an IE security issue, (2) a scope issue (i.e. after creating a new document, IE is confused about which document to print), or (3) a timing issue - the document is not ready to 'accept' a print command yet. In any case, after the reload the print dialogue appears without a problem.
回答2:
It might be because you are doing a return false in the onclick event of the anchor tag.
Try this:
<input type="button" onclick="window.print()" value="Print" />
回答3:
You can try:
<input type="button" onclick="self.print()" value="Print" />
or:
<input type="button" onclick="window.focus();window.print()" value="Print" />
But this might not work in MSIE due to restrictions in Cross-Frame Scripting. The best way to do this, I think, is to put the print button on the main window.
<script language="javascript">
var winref = window.open('print.html','windowName','width=400,height=400');
</script>
<form>
<input type="button" value="Print Popup" onclick="if (window.print) winref.print()">
</form>
回答4:
There must be something more to it than the code shown. I think it works fine (been testing some now).
Here's a miniscule test case. Try it in your setup and see what happens! My checking was under Windows Vista, IE7 and IE8.
main.html:
<html>
<head>
<title>main</title>
</head>
<body>
<h1>Pop & print</h1>
<button onclick="pop();">Pop</button>
<script type="text/javascript">
var POP;
function pop() {
POP = window.open('popup.html', 'thePopup', 'width=350,height=350');
}
</script>
</body>
</html>
popup.html:
<html>
<head>
<title>popup</title>
</head>
<body>
<h1>Pop</h1>
<p>Print me</p>
<a href="print.html" onclick="window.print();return false;">
<img src="images/printer.png" height="32px" width="32px">
</a>
</body>
</html>
回答5:
I have solved the problem by creating a blank HTML page with the standard HTML markup. I then added the content by creating a new DOM element and editing the innerHTML. The resulting code is the same as in the example, simply replacing the newWin.document.write command with the following:
var newDiv = newWin.document.createElement( 'div' );
newDiv.innerHTML = "<h1>Pop</h1>" +
"<p>Print me</p><a href='print.html' onclick='window.print();return false;'>" +
"<img src='images/printer.png' height='32px' width='32px'></a>"
newWin.document.body.appendChild(newDiv);
While the issue has been resolved, I am honestly not sure what was the exact cause of the problem. If anyone has any ideas, I would be glad to hear them.
回答6:
You forgot the:
newWin.document.close();
Document must be closed before msie can print it.
回答7:
This works in Chrome:
<body ><img src="image.jpg" alt="" style="display: block; width: 100%; height: 100%;">
<script type="text/javascript">
window.onload = function() {
window.print();
setTimeout(function() {
window.close();
}, 1);
};
</script>
</body>
回答8:
If you want to print what's in the window you opened from, i suggest you use
window.opener.print();
in the popup.
回答9:
I wanted to create a printer friendly version of a page that then automatically printed, this is what I came up with, seems to work great for me!
function printPage(){
var w = window.open();
var headers = $("#headers").html();
var field= $("#field1").html();
var field2= $("#field2").html();
var html = "<!DOCTYPE HTML>";
html += '<html lang="en-us">';
html += '<head><style></style></head>';
html += "<body>";
//check to see if they are null so "undefined" doesnt print on the page. <br>s optional, just to give space
//This allows you to reuse this on lots of pages with the same template
if(headers != null) html += headers + "<br/><br/>";
if(field != null) html += field + "<br/><br/>";
if(field2 != null) html += field2 + "<br/><br/>";
html += "</body>";
w.document.write(html);
w.window.print();
w.document.close();
};
来源：https://stackoverflow.com/questions/2448676/how-do-you-print-from-a-popup-window-in-javascript