===========
isUndefined
===========


  .. js:function:: webix.isUndefined(a)

   webix.isUndefined helper.

   Please look into the linked `official documentation`_.









Referenced by
~~~~~~~~~~~~~


helpers
   `~webix.editors`:js:attr:,  `~webix.history`:js:attr:,  `~webix.html`:js:attr:,  `~webix.html.addMeta`:js:func:,  `~webix.proto`:js:func:,  `~webix.toPDF`:js:func:,  `~webix.ui.datafilter.dateFilter`:js:attr:,  `~webix.ui.views`:js:func:.
components
   `~webix.Canvas`:js:class:,  `~webix.DataProcessor`:js:class:,  `~webix.DataValue`:js:class:.
mixins
   `~webix.ActiveContent`:js:class:,  `~webix.CopyPaste`:js:class:,  `~webix.DataStore`:js:class:,  `~webix.EditAbility`:js:class:,  `~webix.HTMLOptions`:js:class:,  `~webix.MouseEvents`:js:class:,  `~webix.ProgressBar`:js:class:,  `~webix.TablePaste`:js:class:,  `~webix.Touch`:js:class:,  `~webix.TreeTablePaste`:js:class:,  `~webix.Values`:js:class:.
views
   `~webix.ui.accordion`:js:class:,  `~webix.ui.baselayout`:js:class:,  `~webix.ui.button`:js:class:,  `~webix.ui.calendar`:js:class:,  `~webix.ui.colorpicker`:js:class:,  `~webix.ui.combo`:js:class:,  `~webix.ui.datatable`:js:class:,  `~webix.ui.datepicker`:js:class:,  `~webix.ui.richselect`:js:class:,  `~webix.ui.suggest`:js:class:,  `~webix.ui.text`:js:class:,  `~webix.ui.uploader`:js:class:,  `~webix.ui.view`:js:class:,  `~webix.ui.vscroll`:js:class:.




External references
~~~~~~~~~~~~~~~~~~~

`Official documentation page`_.

.. _official documentation:
.. _Official documentation page: http://docs.webix.com/api___isundefined.html

Code
~~~~

.. literalinclude:: js_srcs/isUndefined_helper.js
   :language: javascript
   :linenos: