Show loading thingy

Is there an equivalent show_loading (as in scheduler) for dhtmlxTree?

There is a method enableLoadingItem()
It is available in PROF tree version. … dingitem&s[]=enableLoadingItem\

Oк if you have a tree in the layout/accordion cell or window - you can apply progressOn() method for the hole cell until the tree won’t be loaded.

Just to be clear, are you saying that I can use progressOn() in the non-PROF tree version?
If the answer is yes, can you provide a simple example.

Yes, ‘progress’ function is for free.
Examples: … gress.html - layout … gress.html - windows
Just imagine, that you have your tree in there containers.

But I assume that I have to use DHTMLX Layout right?

You can use layout 1C as container and hide its header.
It will be something like this:

And then you can hide the border using:
table.dhtmlxLayoutPolyContainer_dhx_skyblue td.dhtmlxLayoutSinglePoly div.dhxcont_global_content_area {
border: 0px !important;