onbeforeprint Event

Fires on the object before its associated document prints or previews for printing.

dhtml语法

Inline HTML <ELEMENT onbeforeprint = "handler" ... > All platforms
Event property object.onbeforeprint = handler JScript only
object.onbeforeprint = GetRef("handler") Visual Basic Scripting Edition (VBScript) 5.0 or later only
Named script <SCRIPT FOR = object EVENT = onbeforeprint> Internet Explorer only

Event Information

Bubbles No
Cancels No
To invoke
Choose Print or Print Preview from the File menu in Microsoft® Internet Explorer.
Press CTRL+P.
Right-click anywhere on a page, and choose Print.
Right-click on a link on a page, and choose Print.
From Windows Explorer, select an .htm file and choose Print from the File menu.
From Windows Explorer, right-click on an .htm file and choose Print.
Default action Prints the document associated with the object for which the event is specified.

Event Object Properties

Although event handlers in the DHTML Object Model do not receive parameters directly, a handler can query an event object for data.
available properties
altKey Sets or retrieves a value that indicates the state of the ALT key.
altLeft Sets or retrieves a value that indicates the state of the left ALT key.
button Sets or retrieves the mouse button pressed by the user.
cancelBubble Sets or retrieves whether the current event should bubble up the hierarchy of event handlers.
clientX Sets or retrieves the x-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars.
clientY Sets or retrieves the y-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars.
ctrlKey Sets or retrieves the state of the CTRL key.
ctrlLeft Sets or retrieves the state of the left CTRL key.
returnValue Sets or retrieves the return value from the event.
screenX Retrieves the x-coordinate of the mouse pointer's position relative to the user's screen.
screenY Sets or retrieves the y-coordinate of the mouse pointer's position relative to the user's screen.
shiftKey Sets or retrieves the state of the SHIFT key.
shiftLeft Retrieves the state of the left SHIFT key.
srcElement Sets or retrieves the object that fired the event.
type Sets or retrieves the event name from the event object.
x Sets or retrieves the x-coordinate, in pixels, of the mouse pointer's position relative to a relatively positioned parent element.
y Sets or retrieves the y-coordinate, in pixels, of the mouse pointer's position relative to a relatively positioned parent element.

Remarks

Use this event to modify the document just before it prints or previews for printing. In most cases it is used to make all the information on the page visible just before printing.
Use the event in conjunction with the onafterprint event to undo the changes made to the document in the onbeforeprint event.

DHTML代码范例

This example uses the onbeforeprint to make all hidden sections of the page visible just before the page prints. The onafterprint event is processed after the page prints to return the document to its original state.

function window.onbeforeprint()
{
// Walk through all the elements in the document with
// CLASS="collapsed" and set it to "expanded" just for printing.
var coll = document.all.tags("DIV");
if (coll!=null)
{
for (i=0; i<coll.length; i++)
if (coll[i].className == "collapsed")
{
coll[i].className = "expanded";
// After printing, make sure to set CLASS="collapsed"
// only for those that were expanded just for printing.
coll[i].bExpandedForPrinting = true;
}
else if (coll[i].className == "expanded")
coll[i].bExpandedForPrinting = false;
}
}
function window.onafterprint()
{
// Walk through all the elements in the doc with CLASS="expanded"
// and set it to "collapsed" if expanded just for
// printing.
var coll = document.all.tags("DIV");
if (coll!=null)
{
for (i=0; i < coll.length; i++)
if ((coll[i].className == "expanded") &&
(coll[i].bExpandedForPrinting))
{
coll[i].className = "collapsed";
coll[i].bExpandedForPrinting = false;
}
}
}

This feature requires Microsoft® Internet Explorer 5 or later. Click the following icon to install the latest version. Then reload this page to view the sample.

是否符合公共标准

There is no public standard that applies to this event.

Applies To

window, BODY, FRAMESET

更多语法参考

onafterprint, print