isBranchOpen

checks whether the specified branch is open or closed

Example

tree = webix.ui({
    view: "tree",
    data: [
        { id: "branch1", value: "The Shawshank Redemption", data: [
            { id: "1.1", value: "Part 1" },
            { id: "1.2", value: "Part 2" }
        ]},
        { id: "branch2", value: "The Godfather", data: [
            { id: "2.1", value: "Part 1" }
        ]}
    ]
}); 
 
tree.isBranchOpen("branch1");