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How to set cookie for dhtmlxTree

hi,
i m using dhtmlxTree for my tree menu. its working well.
but i want save states of last open nodes in cookie. so when any open page it will so last open nodes.

i read and get dhtmlXTree_xw.js file but i dont have idea how to call this function and make it working.
plz help me.

To save state in cookies
    tree.saveOpenStates();
To load state
    tree.loadOpenStates()

You code will be similar to next
    tree = new ..
    ...
    tree.loadXML(url,function(){
        tree.loadOpenStates()
    });
    dhtmlxEvent(window,"unload",function(){
        tree.saveOpenStates()
    });

hi,

I diidn'd get what u say. can u plz tell me in details or send me any working example or reference for my problem. I m not load menu from XML. i m using simple HTML base tree. i m attached here my example in .rar file.

MY PROBLEM IS:

i m using dhtmlxTree for my tree menu. its working well.
but i want save states of last open nodes in cookie. so when any open page it will so last open nodes.

i read and get dhtmlXTree_xw.js file but i dont have idea how to call this function and make it working.

 

The same commands will work for HTML base tree as well, just need to execute them in correct moment of time.
Please check attached sample.