SchedulerDataSource, Cannot read property 'data' of undefined

2 posts, 1 answers
  1. Grant
    Grant avatar
    88 posts
    Member since:
    Jul 2016

    Posted 04 Oct 2016 Link to this post


    I've created a widget that uses the KendoScheuler inside a kendoWindow and sets its DataSource dynamically. Code below, shortened for brevity:


    function openWindow(optionOverrides) {
      var options = {
         * @type {Array |}
         * @required
         * The dataSource where existing events are read from, can be a or a JavaScript Array.
         * If an array is used a new will be created with the 'data' attribute set as the array
        dataSource: null
      //Validate a dataSource exists
      if (!validateArgument(optionOverrides.dataSource, ["object"])) {
        console.error("SchedulerDataSource of incorrect type. Expected: object; found: " + typeof optionOverrides.dataSource);
        return false;
      } else {
        if ((optionOverrides.dataSource).constructor == Array) {
          //If the optionOverrides.dataSource is an array, use it to create a new containing the array data
          var schedulerDS = new{
            data: optionOverrides.dataSource
          options.dataSource = schedulerDS;
        } else if ((optionOverrides.dataSource).constructor == {
          //Use optionOverrides.dataSource if it is already a
          options.dataSource = optionOverrides.dataSource;
        } else {
          console.error("optionOverrides.dataSource object not of type Array or");
          return false;
      var dfd = $.Deferred();
      var result = null;
      $("<div />")
        .attr("id", "window-schedulerWindow")
          visible: false,
          modal: true,
          resizable: false,
          title: options.title,
          activate: function(e) {
            //Hide the headers of the scheduler
            var timePickerScheduler = $("#scheduler-scheduleTimePickerWindow-timePicker").data("kendoScheduler");
            //Set data source after initialization. Prevents data being loaded before the scheduler is ready
          open: function(e) {
            var timePickerScheduler = $("#scheduler-scheduleTimePickerWindow-timePicker").kendoScheduler({
              /* Attributes removed for Brevity */

             edit: function(e) {

                   e.preventDefault(); //prevent default event editing

                   //Retrieve and sync the dataSource with the new event generated in the 'add' callback
                  var dataSource = this.dataSource;


      return dfd.promise();

    The Problem:
    So the issue Im having is that if the SDS is created fresh from an array of Event Objects, everything works fine, however, if I specify an already existing SDS, that uses remote data, and then start dragging and resizing events, I get the error: "Cannot read property 'data' of undefined", which points to statement 'dataSource.sync();' in the 'edit' event of my scheduler.

    Is there some kind of sync trying to happen with the remote SDS? I monitored my network activity and didnt see anything.

    Please advise, Thanks,



  2. Answer
    Rosen avatar
    3247 posts

    Posted 06 Oct 2016 Link to this post

    Hello Grant,

    Indeed, the DataSource sync method will try to push the changes to the server. Therefore, you should verify that the DataSource transport is correctly configured for CRUD operations.

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