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# Tuesday, 28 May 2013

While developing with KendoUI we have found kendo.ui.progress(container, toggle) function to be very useful. It's used to show or hide a progress indicator in the container element.

At the same time we have found that we usually used it in a context of async operation. This way, we want to show progress, perform some asynchronous operations, hide progress. So, we clearly want to benifit from RAII pattern: we would like to open a progress scope, and to perform some activity withing this scope.

Arguing like this, we have defined a utility function, which is the fusion of kendo.ui.progress() and $.when(). Its signature is like this:

nesterovskyBros.progress = function(instance /*, task ... */)

where instance is either Model, Widget, JQuery or DOM Element, and task is one or more deferred objects. This function shows a progress and returns a Promise that will hide a progress when all tasks will be complete. Implementation is trivial, so we quote it here:

// Fusion of kendo.ui.progress() and $.when().
scope.progress = function(instance /*, task ... */)
{
  if (instance instanceof Model)
  {
    instance = instance.owner && instance.owner();
  }

  if (instance instanceof Widget)
  {
    instance = instance.element;
  }

  if (instance && instance.nodeType)
  {
    instance = $(instance);
  }

  var id = ns + "-progress"; // "nesterovskyBros-progress";
  var progress = (instance && instance.data(id)) || 0;

  if (arguments.length < 2)
  {
    return progress;
  }

  var result = $.when.apply(null, [].slice.call(arguments, 1));

  if (instance)
  {
    instance.data(id, ++progress);
    kendo.ui.progress(instance, progress > 0);

    result.always(
      function()
      {
        progress = instance.data(id) || 0;
        instance.data(id, --progress);
        kendo.ui.progress(instance, progress > 0);
      });
  }

  return result;
};

The use is like this:

nesterovskyBros.progress(element, $.ajax("/service1"), $.ajax("/service2")).then(myFunc);

The code can be found at controls.js.

Tuesday, 28 May 2013 05:54:52 UTC  #    Comments [0] -
javascript | kendoui | Tips and tricks
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