Kendo UI Treeview Sprite-Altering Template

Question

I have a kendo Treeview bound to a remote hierarchical datasource(JSON file).

I want to add sprites next to each one of the nodes according to what the node is.If the node doesn't have children then I want it to have the "file" sprite,if the node has children I want it to have the "folder" sprite.(The sprites are provided from kendo,the ones that are on the demos)

I'm a bit confused with the way templates work,can I alter the sprite for each of the nodes dynamically with the template?Any good example and a bit of explanation to get me going would help a lot.

Thx

Answer 1

In the following code what I do is define a template that checks if the node being rendered has items (subnodes) or not. If it has, it displays an icon from default sprite file (k-i-plus) otherwise it shows a different icon (k-i-refresh).

function loadMore() {
    var uuid = $(this).data("uid");
    var node = tree.findByUid(uuid);
    tree.insertBefore(content, node);
    tree.remove(node);
    tree.expand(".k-item");
    addLoadMore(".k-i-refresh");
}

function addLoadMore(clss) {
    $(clss, tree.element).closest(".k-item").on("click", loadMore);
}

var content = [
    {
        text :"node1",
        items:[
            { text:"node1.1" },
            { text:"node1.2" },
            { text   :"node1.3",
                items:[
                    { text:"node1.3.1" },
                    { text:"node1.3.2" },
                    { text:"node1.3.3" },
                    { text:"node1.3.4" }
                ] },
            { text:"node1.4" }
        ]
    }
];

var tree = $("#tree").kendoTreeView({
    dataSource:content,
    template  :"<span class='k-icon #= item.items ? 'k-i-plus' : 'k-i-refresh' #'></span>#= item.text #"
}).data("kendoTreeView");
tree.expand(".k-item");
addLoadMore(".k-i-refresh");

What you would need to do if replace k-i-plus by the CSS class name that defines the folder and change k-i-refresh by the CSS class name for the file.

If you need information on writing template there is a pretty good documentation in here.

Answer 2

I know I am 3+ years late for this. But in case anyone run into this same question. Here is how I achieved it:

    schema: {
        model: {
            children: "folder",
            hasChildren: function (node) {
                var hasChildren =  (node.folder && node.folder.length > 0);
                if (hasChildren === true) {
                    node.spriteCssClass = "folder";
                } else {
                    node.spriteCssClass = "html";
                }
                return hasChildren;
            }
        }
    }