Top 18 Dojo
Interview Questions
1) Explain what is Dojo?
Dojo
is a JavaScript framework, an assembly of utilities written to ease development
of client-side web applications. It is a tool for constructing dynamic web user
interfaces.
2) Explain what are application support libraries in Dojo?
Application
support libraries in Dojo consists of
·
I/O package provides routines, e.g., for AJAX binding
·
For drag and drop operations DND package provides routines
·
Useful routines are available for login, animation and storage.
3) Explain why does <body> in many of tests HTML files have
style = “visibility hidden”?
It
is to stop raw HTML rendering result from being shown before dojo’s rendering
finishes.
4) Mention what are the advantages or benefits of Dojo?
Advantages
or benefits of Dojo includes
·
Loosely typed variables
·
Associative arrays
·
Objects and classes
·
W3C DOM support in the Dojo
·
Regular expression
·
Associative arrays
5) Mention what are the drawbacks of Dojo?
·
For Dojo, developer has to depend on the browser support
·
In the case of commercial application there is no way to hide
the Dojo code.
6) What does all include in Dojo Architecture?
Dojo
Architecture includes
·
DojoX
·
Dijit
·
Dojo Core
·
Dojo Base
·
Custom code
·
Util
7) Explain what is Dijit and DojoX?
·
Dijit: It is a widget system and component library
layered on top of Dojo it enables the user to re-use or use reprogrammed widget
·
DojoX: It contains widgets, utilities and classes
that are not yet ready for inclusion in the main Dojo library. It has
experimental elements and widgets.
8) Explain what makes a widget?
A
widget is comprised of two resources
·
A .js file that consists the logic of the widget
·
An HTML snippet that carries the way the widget is presented
9) Mention what is the basic structure in Dojo?
Basic
structure in Dojo includes
·
/index.html : Entry point for application
·
/app: The application module
·
/app/main.js: Main script for app module
10) Mention what are the limitations of Dojo?
Limitation
of Dojo are
·
It needs much network
·
Developer remains dependent on the browser support for the Dojo
·
In the case of commercial application there is no way to hide
the Dojo code
·
Documentation is quite narrow
·
In the case of commercial application there is no way to hide
the Dojo code.
11) Explain whether Dojo is a part of Ajax and distinguishes their
roles?
Dojo
is not a part of Ajax; it is an open source JavaScript toolkit, designed to
ease the quick development of JavaScript or Ajax-based applications and
websites. It provides you with lots of custom components like data grid,
scroller, calendar, etc. It serves some data-structure mode like collection and
array list, and it also provides some advanced API’s like API to make AJAX
calls.
While, AJAX is an Asynchronous JavaScript and XML, together they
make it possible to make JavaScript function call to your server and
trigger a response. They use XMLHttpRequest and XMLHttp response object.
12) Mention what are Modules in Dojo?
In
Dojo, Modules are individual codes that can be loaded separately. They
are identifying using a string that is similar to the file path where the code
is defined. Example: my/module/class.
13) Explain about the language libraries in Dojo?
Language
libraries in Dojo includes
·
lang.*
·
Wrappers for common idioms
·
Functional programming APIs
14) Mention the features of Dojo Charting?
Dojo
Charting enables developers to create dynamic, functional and unique charts
from varying sets of data. The charting library lives within the dojox/charting
resource.
·
It allows chart to be created with JavaScript or HTML
·
It works on almost all devices
·
It can render charts in VML, SVG,Silverlight and Canvas
·
It gives freedom to the developer to choose which renderer to use
·
It evaluates the client and based on the client supports, uses
an appropriate renderer
·
It allows to use dojox/gfx library to make charts animate in a
wide variety of ways
·
It comes packaged with dozens of diverse and attractive themes
·
It allows for linear and radial gradient within chart themes.
15) List out some of the components that come along with Dojo
Framework?
Components
that comes along with Dojo Framework includes
·
Dojo Tree
·
Dojo List box
·
Dojo Calendar control
·
Dojo Grid
·
Dojo Button, etc.
16) Explain what is the difference between JQuery and Dojo?
|
DOJO
|
JQUERY
|
|
·
Dojo is a JavaScript toolkit or framework
·
Dojo has also got some built in
functionality that are proven and well accepted
·
Dojo is HTML and JavaScript based tool kit
·
Dojo might not be as easy to use
·
Dojo provides the features of widget toolkit
·
Dojo requires higher network bandwidth
·
For creating bigger website and application,
Dojo is preferred
|
·
JQuery is a JavaScript library
·
JQuery has built-in plugin, but the plugins
might not be verified
·
JQuery supports almost all web languages
·
JQuery is simpler to use compared to DOJO
·
JQuery is customizable and used to create
Ajax applications
·
It will work even at low network bandwidth
·
JQuery is perfect for small websites
|
17) List out some of the Dijit Layout widgets?
·
ContentPane
·
LinkPane
·
Border Container
·
Tab Container
·
Split Container
·
Stack Container
·
Accordion Container
18) Explain the function of Dojo/ready module?
The
dojo/ready module has a function that records a callback that will run once the
three conditions have met:
·
DOM is ready
·
All outstanding or remaining modules of requested code have
completed loading
·
Other registered functions with a higher priority have
completed.
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