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How to restrict opening multiple windows on the same link.

 
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I need help in modifying my application.
Currently in my application there is a link on which windows opens up even if the window is already open on the same link.
Its on the link.

I want the functionality as it should not open the window if the window is already open.
How to do this in javascript?

 
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IntelliJ IDE Ruby
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Keep track if the window's been opened? Check for a function/value defined in the window page (not sure what happens to JavaScript data from a window once the window's been closed)?
 
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The 2nd parameter of window.open is a name. https://developer.mozilla.org/En/DOM/Window.open

Eric
 
Don't get me started about those stupid light bulbs.
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