How to make nodes of tree disabled

[nyr_jack]

When displaying a tree with remote loaded data,  I want some nodes can't to  be checked or selected, and  make those nodes are disabled whit gray color, so how to do,  please help !!!!

[nyr_jack]

Now I just want to know how to make the checkbox disabled, please help !!!!

[stworthy]

The 'onBeforeCheck' event can be used to determine if one node can be checked.

Code:

$('#tt').tree({
  onBeforeCheck:function(node){
    if (node.id == 'md'){  // this node can not be checked
      return false;
    }
  }
});

[nyr_jack]

No bad, Thank you !