Async Treeview Datasource Q

[Simon Woods]

Hi ... relatively new to webdev ...

I'm trying to populate the treeview from an async remote data source

var tree = $('#treeview').kendoTreeView({   
        dataSource: getQueryData(),
        dataTextField: "Name",
        select: function (e) { 
         var id = this.dataItem(e.node).id;
         onChange(id);
        }

I need to retrieve the data then process it prior to setting the data source in order to add sprites. Thus far my solution is as follows

  function fetchData(cb) {
    var data = [];
    var ds = new kendo.data.DataSource({
      transport: {
        read: {
          url         : "http://localhost:57773/api/definitions",
          dataType    : "json"
        }
      }
    });

    ds.fetch(function () {
      data = cb(ds.data());              
    });      

    return data;
  };

  function addSprites (data) {
    for (var key in data) {
      if (key == "NodeType") {
       data.spriteCssClass = data.NodeType;
      }

      if (data[key] !== null && typeof(data[key])=="object") {
        addSprites(data[key]);
      }
    }
    return data
  };

  function getQueryData () {  

    var dataitems = fetchData(addSprites);
    
    var hds = new kendo.data.HierarchicalDataSource({
      data: dataitems,
      schema: {
        model: {
          id          : "Key",
          hasChildren : "HasChildren"          
        }
      }  
    });

    return hds;
  }; 

I am not quite sure how I should be architecting this since the hierarchical data set is returning prior to the completion of the async data retrieval and pre-processing of that data. I'd be grateful if someone could give me a steer as to how to do this "properly". If possible I'd like to avoid going synchronous.

Thx IA.

Simon

[Simon Woods]

One of co-workers pointed me to dataSpriteCssClassField which meant I could bind directly to the datasource

[Alex Gyoshev]

Hello Simon,

Indeed, you can use the dataSpriteCssClassField to specify the field where the sprite class is held (in your example, this appears to be "NodeType".

Regards,
Alex Gyoshev
Telerik