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resizeTo

As mentioned previously, the feature string is comma-delimited and, therefore, must contain no space

before or after a comma or equal sign. For example, the following string is invalid:

window.open(“http://www.wrox.com/”, “wroxwindow”,

“height=150, width= 300, top=10, left= 10, resizable =yes”);

This string won’t work because of the spaces after the commas and other spaces around a couple of

equal signs. Just remove the spaces and it works fine:

window.open(“http://www.wrox.com/”, “wroxwindow”,

“height=150,width=300,top=10,left=10,resizable=yes”);

The

window.open()

method returns a

window

object as its function value that is also the

window

object

for the newly created window (or for the frame, if the name given is the name of an existing frame).

Using this object, it’s possible to manipulate the new window:

var oNewWin = window.open(“http://www.wrox.com/”, “wroxwindow”,

“height=150,width=300,top=10,left=10,resizable=yes”);

oNewWin.moveTo(100, 100);

oNewWin.resizeTo(200, 200);

Also using this object, it is possible to close the new window using the

close()

method:

oNewWin.close();

If there is code in the new window, it can close itself by using:

window.close();

This only works in the new window. If you try to call

window.close()

in the main browser window,

you get a message saying that a script is trying to close the window and asking if you actually want it to

close. The general rule to remember is this: Scripts can close any windows that they open, but no others.

A new window also has a reference to the window that opened it stored in the

opener

property. The

opener

property exists only on the topmost

window

object of the new window, making it safer to use

top.opener

to access it. Example:

var oNewWin = window.open(“http://www.wrox.com/”, “wroxwindow”,

“height=150,width=300,top=10,left=10,resizable=yes”);

alert(oNewWin.opener == window); //outputs “true”

In this example, a new window is opened and then its

opener

property is tested against the

window

object to prove that

opener

does indeed point to

window

(this alert displays

“true”

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Chapter 5

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