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In my project, I want a product belong multiple categories, so I use the checkbox function of dhtmlxtree.

My questions are:

1.   How can I set the checkbox be checked when the tree be initialed?
Because my product categories data is come from mysql.  I want it when I modify a product, it can remember what categories are belonging. And next time when I modify the product, it can show the last time what categories I checked.

2.   How can I get “an” item ID when I check it?  (Not All Item ID, such like getSelectedItemId() function)
Because I want when the item is checked, it will update the status in mysql by each time. So, I need a item ID, not get all item ID.

1. use “checked” attribute in item tag to set item checked – checked=”any value”

2. use onCheck event handler. To set it use the following method:
setOnCheckHandler(func)
sets function called before checkbox checked/unchecked
EventName:onCheck
Even handler gets following values:

• ID of item which will be checked/unchecked
• Current checkbox state. 1 - item checked, 0 - item unchecked.

Example:
            yourTree.setOnCheckHandler(
            function(id,state){
                        alert(“Item ID: ”+id)
                        alert(“Item checked: ”+state)

})

Having solved the problem mentioned above, you may also look through the possible related problems with javascript table filter and google event calendar.