javascript - Sending Ajax request only once -


When I change the URL of the main browser, I am using the following code to call the function. 

  var mainWindow = window.QueryInterface (.comonents.interfaces.nsIInterfaceRequestor) .get interface (Components.interfaces.nsIWebNavigation) .interface (Components.interfaces.nsIDocShellTreeItem) .rootTreeItem .QueryInterface (Components.interfaces .nsIInterfaceRequestor) .get interface (Components.interfaces .nsIDOMWindow); MainWindow.getBrowser () AddEventListener ("DOMContentLoaded", function () {getFromDB ();}, false);

this sends the request to getFromDB () server 

  request = new XMLHttpRequest (); Request.open ("GET", "http://www.mydomain.com/getJSON.php", true); request.

Everything is working fine, but the problem is that sometimes the request is being sent to the server for infinite numbers. If the browser loads from a page within loacalhost , the request is only sent once.

I load / request per page (URL changes only)

I have used some Boolean checks. But they do not work. 

  var check = 0; If (check == 0) {check = 1; GetFromDb (); }

In the first addEventListener line: 8 help me get it.

You need a global variable for this 

  if (window .check == 0 || typeof (window.check) == "undefined") {Window.check = 1; GetFromDb (); }

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