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Show progress while loading URL

I have a URL that takes a 3-8 seconds to load into the window and I would like to give some indication to the user that something is working so they know to wait.

I would be happy with any of the following:

1.) I would like to have the progress spinner show while the URL is loading and stop when it is done. I tried to the following unsuccessfully...it turns it on then off right away because the attachURL does not wait.
w1.progressOn();
w1.setText("Window Title");
w1.attachURL("http://www.myurl.com");
w1.progressOff();

2.) I would be okay if the text inside the window would show a message that is replaced with the new content. I have tried the following unsuccessfully
w1.setText("Window Title");
w1.attachURL("http://www.myurl.com/wait_msg.htm"); //Simple HTML that just says "Loading...please wait..."
w1.attachURL("http://www.myurl.com");

>>1.) I would like to have the progress spinner show while the URL
It was a bit hard to implement with original code , you can try to use attached version instead of original one ( latest build ) - it provides additional event - onContentLoaded

w1.progressOn();
w1.setText("Window Title");
dhxWins.attachEvent("onContentLoaded", function(win){
    win.progressOff();
});
w1.attachURL("http://www.myurl.com");

Hello, I've the same need.

Does this new feature (onContentLoaded) will take part of the official next version of dhtmlxwindows ?

Yes, this event will be part of next version of dhtmlxWindows.