274Part IIIDocument Objects ReferenceListing 15-23: The window.focus() and window.blur() Methods

Window focus() and blur() Methods

A key ingredient to the success of the makeNewWindow()function in Listing 15-23 is the firstconditional expression. Because newWindis initialized as a nullvalue when the page loads, that is its value the first time through the function. But after you open the subwindow the firsttime, newWindis assigned a value (the subwindow object) that remains intact even if the usercloses the window. Thus, the value doesn t revert to nullby itself. To catch the possibility thatelementObject.blur()

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