Elance ExtJs Test Answers 2015
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What is the difference between Ext.get() and
Ext.getDom()?
Ext.get() is faster than Ext.getDom().
Ext.get() only allows xpath queries.
Ext.get() will convert a DOM object to an
Ext.element object, whereas Ext.getDom() will convert an Ext.element object to
a DOM object.
Ext.get() makes the CPU spin faster than
Ext.getDom().
Extjs 4.x provide us a new concept when we
work with MVC pattern, this is a class when we need to control the views in the
Controller class and is useful to provide us a searching of components within
Ext.ComponentManager.
Ext.create
Ext.ComponentQuery
Ext.chart.Chart
Ext.draw.Component
In Ext, what is a proxy?
Proxies are dummy controls that hold the values for
the real controls.
Proxies are members of the Ext support staff will
write your code for you.
Proxies are used by Stores to handle the loading
and saving of Model data. Usually developers will not need to create or
interact with proxies directly.
Proxies are dummy controls that handle the events
such as a click event in lieu of the actual control.
How would a developer set a control to hidden
in Ext?
makeVisible(false)
doVisible(false)
setVisible(false)
becomeHidden(true)
What is the name of the object a developer
would use to create a group of radiobuttons in which only one radio button can
be selected at a time?
Ext.form.RadioGroup
Ext.form.Radio
Ext.form.CheckBox
Ext.form.RadioTeam
What is the name of the event that fires when
all the DOM objects have been loaded but before all images are loaded and
before the onLoad event?
onDocumentReady
onReadyToGo
onBeforePageLoaded
onBeforeLoaded
Extjs 4.x is Sencha's latest JavaScript
framework for developing cross-platform web applications
False
True
Which one of the following is not a valid
layout type in Ext?
HBoxLayout
VBoxLayout
ResponsiveLayout
BorderLayout
True or False. There can only be one locked
column.
TRUE
False
Which of the following parameter type(s) is a
valid renderTo config option value?
All of the these
extJS element
id of element
DOM element
Which config option is used to bound a
component within the dimension of another container?
locked
constrainTo
constrain
lock
The ________ is a useful proxy when you need
to make request to a different domain, on which your application is not
deployed.
writers
stores
readers
JsonP proxy
JsonWriter
Why would a developer use Ext.fly() instead of
Ext.get()?
In a situation where a developer would be calling a
repetitive,atomic function on many different elements and needs to reduce the
memory footprint.
To make a small, airborn insect appear in the DOM.
To increase the number of controls allowed on a
page.
To make Ext run in turbo-mode.
The _______ is a subclass of VBoxLayout. This
already tells us that the components will be organized vertically in the
container. We can collapse or expand the items.
Absolute layout
HBox layout
Anchor layout
Accordion layout
The _____ organizes its children horizontally
across the container.
HBox layout
Absolute layout
Anchor layout
Accordion layout
What is the name of the class that provides
the developer with an area autosized to the browser viewport?
Ext.container.Viewport
Ext.fullSizeWindow
Ext.HTMLElement
Ext.window
The utility method "Ext.define" is
used for which one of the following?
To create a user-defined control.
To define an enumeration.
To create a class in Ext that extends and
optionally overrides the methods and properties of a parent class.
To define a global variable.
What plugin is required for cell editing?
Ext.plugin.Editing
Ext.grid.plugin.RowEditing
Ext.grid.plugin.Editing
Ext.grid.plugin.CellEditing
The _______ is responsible for encapsulating
the Model and can also configure a proxy to load or save the data.
Writers
XmlWriter
Readers
Store
JsonWriter
Which of the following is a required config
option for grid column?
itemId
data
id
dataIndex
How is Ext JS licensed?
Open Source
Commercial Software
Proprietary Software
Commercial Software and Open Source
What object render itself to the document
body?
Ext.form.Panel
Ext.container.Viewport
Ext.panel.Panel
Ext.container.Container
Why would a developer use a JsonPStore instead
of a JsonStore?
JsonPStores work better with server side JSON.
A JsonP store can hold more data than a JsonStore.
To facilitate the creation of a store in Ext that
would allow for cross-site requests of JSON data.
To create a store that has data with no flaws in
it.
What is the name of the Ext utility function
to convert a JSON string into an object?
Ext.JSON.convert(json)
Ext.JSON.string.translate(json)
Ext.JSON.toObject(json)
Ext.JSON.decode(json)
Which of the following is not an Ext layout
type?
float
vBox
border
fit
What is the name of the control in Ext, that
will create a control similar to an html <select>?
DropDownList
combinationBox
multiSelectBox
comboBox
What is the difference between theming and
styling in Ext?
Themes are only one file, styles require many
files.
Themes are more visually appealing.
Themes are cheaper than styles.
Theming is differentiated from "styling"
by the ability to flip a switch and change the theme.
Which of the following is a required config
option for grid panel?
xtype
data
store
id
Which of the following is NOT a valid way to
add an event listener to an Ext.Panel?
In the panel's config, define the listeners
property.
provideListener(eventName,handler,scope, options)
panelObject.on("eventName",handler)
addListener( eventName, handler, [scope], [options]
)
What are the 4 folders that a developer should
create to employ the recommended MVC architecture in Ext?
Controls,Views,UIs,Events
Clicks,Selects,Changes,Checks
Models,Views,Animations,HTML
Models,Views,Controllers,Stores
With Sandbox mode you can run Extjs 4
alongside with previous versions of Extjs on the same page.
True
False
Why would a developer use a Pager?
To simulate an e-Reader.
To alert users of problems with their data.
To make ComboBoxes display faster.
To more quickly display and load large amounts of
data in a GridPanel.
What region type is required for border
layout?
North
Center
No region type is required
South
East
Extjs 4 introduces a new package organization
and that is why some classes names are not the same as they were in Extjs 3.
False
True
What is a RESTful store in Ext?
A store that allows for cross-site scripting.
A store that allows the user to slowly browser a
website.
A stores that supports a convenient way to
interface with a RESTful web service.
A store that slows when the demand is too much on
the server's hardware.
What is theme inheritance?
Making your themes object oriented.
Creating themes that are passed from one developer
to another.
Setting up your theme to extend or inherit from a
base theme so as to include all the necessary classes to work properly.
Creating themes that have similar colors.
Which of the following is not a valid way to
add an event listener?
use on() function
use listeners config option
use events config option
use addListener() function
What of the following is the correct syntax
for defining column?
columns: [ {text='Name', dataIndex='name', flex=1 }
]
columns: [ {text=Name, dataIndex=name, flex=1 } ]
columns: [ {text:Name, dataIndex:name, flex:1 } ]
columns: [ {text:'Name', dataIndex:'name', flex:1 }
]
True or false? Ext Js supports all major web
browsers including: IE 6+,Firefox 1.5+(Pc,Mac),Safari 3+,Opera9+(Pc,Mac).
False
True
What is the shorthand function for
addListener()?
add()
trigger()
live()
on()
What is the difference between an Ext.element
and an Ext.component?
Elements are visible and components are invisible.
Elements are the parent class of Components.
An Ext.element encapsulates a DOM element, adding
simple DOM manipulation facilities, normalizing for browser differences,
whereas an Ext.component is the base class for all objects in Ext, such as
controls, panels and stores.
Elements are heavier objects in memory and
components are more lightweight
One of the most common components used for
layout in Ext is which one of the following?
ContentArea
Combobox
Grid
Panel
Ext JS is a JavaScript library for developing
interactive web applications using technologies such as AJAX, DHTML and DOM. It
was developed by Sencha.
False
True
In a form layout, what is the name of the
property that will automatically create a label above a control if set?
LabelTitle
fieldLabel
showLabel
componentLabel
What is the name of the method on an
Ext.data.store that synchronizes the records in the store with a remote data
source?
sync
load
download
upload
is it possible to migrate from Extjs 3 to
Extjs 4?
True
False
Which function would a developer use to select
only certain child elements of an Ext.element?
Ext.select()
Ext.filter()
Ext.scrape()
Ext.trimDown()
Linking Models: There are two types of
Associations between Models: belongsTo and hasMany. But one represents a one to
many ralationship between two models.
belongsTo
anything
hasMany
Why would a developer use an ArrayStore?
To create multiple stores chained together into one
store.
To create a store that can't use JSON.
To create multi-dimensional stores.
To facilitate the creation of stores from arrays of
data.
The LocalStorageProxy uses the new HTLM5
localStorage API to load and save data into the client brwoser
True
False
The ______ validation verifies if the given
value matches the given regular expression.
presence
length
inclusion
exclusion
format
What is the method to instantiate a class in
ExtJS 4.*?
Ext.define()
Ext.extend()
Ext.load()
Ext.create()
What data proxy does Ext support?
JSON-P
AJAX
All of the above
REST
What is the name of the property on a grid
that controls the number of clicks required to edit a cell on a GridPanel?
numClicksEdit
clicksToEdit
editingClicks
clickingEditCount
Which one of the following is true about the
Ext viewport?
The viewport automatically re-sizes itself to the
size of the browser viewport.
The viewport can only have 4 items in it.
The viewport has a 4px black border by default.
The viewport does not allow a different layout type
to be specified.
Which one of the following is the correct
syntax in Ext.js to make an ajax request?
Ext.ajax.Request(options)
ext.ajax.request(options)
Ext.Request.Ajax(options)
Ext.Ajax.request(options)
Why would a developer use buffered scrolling?
Buffered scrolling makes all the UI interactions
run at 120 fps.
Buffered scrolling enables a developer to load any
number of records into a grid without paging.
This allows a developer to submit changes without
validation.
Buffered scrolling makes the interface much
shinier.
What is the root class for all Ext classes?
Ext.Base
Ext.Component
Ext.Root
Ext.Class
How do you create a new class?
Ext.define ('MyApp.NewClass',{ // class
functionalities here });
Ext.define = new ('MyApp.NewClass',{ // class
functionalities here });
MyApp.NewClass=Ext.extend(Object,{// class
functionalities here });
MyApp.Class=New Ext.extend(Object,{// class
functionalities here });
All these
Extjs 4.x includes a new pattern concept named
MVC.
False
True
Which of the following is not a grid panel
feature?
GroupingSummary
Count
Summary
Grouping
What is the correct option to completely fill
the width of a container?
width: ‘max’
width: 100%
maxWidth: true
flex: 1
Which of the following is not a config option
of Ext.util.Sorter?
sorterFn
dataIndex
property
direction
is Extjs a cross-browser RIA framework?
True
False
What is one advantage of using xtype to create
objects in Ext?
Increase cpu parallelization
Reduces number of for loops
Utilizes the MVC design pattern
more concise syntax
What does the remove() function return?
true when removal is successful, false when removal
fails
the function does not return value
the component that was removed
the calling component
What is that config option for changing CSS
class on a column cell?
Style
tdCls
CLS
CSS
The ____ classes are resonsible for decoding
the raw data from a server that is to be loaded into a Model instance or Store.
Readers
Jsonp Proxy
Proxy
Writers
Store
What is the correct syntax to enable gridpanel
text selection?
viewConfig: { enableTextSelection: true }
textSelection: true
columns: { enableTextSelection: true }
fields: { enableTextSelection: true }
What is the name of the method that allows a
developer to remove an event listener from an object or control?
disableEvent
removeEvent
destroyEvent
un
Which types of objects in Ext fire an
initComponent event?
panels
components
objects
grids
What is the method to create a class in ExtJS
4.*?
Ext.load()
Ext.define()
Ext.extend()
Ext.create()
What is the difference between Ext.addClass()
and Ext.removeClass()?
Ext.addClass() is deprecated.
Ext.addClass() will add the class to a DOM object
whereas Ext.removeClass() will remove a class from a DOM object.
Ext.removeClass() has better performance.
Ext.addClass() has better performance.
Which of the following is not a subclass of
Ext.grid.column.Column?
Ext.grid.column.String
Ext.grid.column.Boolean
Ext.grid.column.Number
Ext.grid.column.Date
Which of the following xtype(s) defines a grid
panel?
grid and gridpanel
grid
gridpanel
panel
To enable grid buffering,
set buffered: true on Ext.grid.Panel
caching: true on Ext.grid.Panel
set caching: true on Ext.data.Store
set buffered: true on Ext.data.Store
What action does the remove() function
perform?
removes all components from this container
removes a component from this container
removes itself from a parent container
Which of the following is not an
Ext.form.field object?
Hidden
ComboBox
Button
Text
Which one of the following is a valid way to
get DOM elements using Ext?
Ext.findElement(id)
Ext.getElementById(id)
Ext.getCmp(id)
Ext.loadElement(id)
The correct syntax to change a theme
programmatically is:
application.Themify(theme-name)
app.theme=theme-name
app.switchTheme(theme-name)
app.ChangeTheme(theme-name)
Which of the following technique will not help
improve Ext JS performance?
Replace Containers with Panels
Reduce DOM reads and writes
Reduce container nesting
Remove doLayout and doComponentLayout calls
True or False. The constrainTo option is only
applicable to 'floating' components.
FALSE
True
Which one of the following events on an
Ext.data.store object fires AFTER the store is loaded?
afterLoad
loadComplete
postLoad
load
The ____ validation verifies if the length of
the given value is between the min and the max values. The min and the max
configuration are optional.
presence
format
length
exclusion
inclusion
The ________ is a helper. Usually, it is used
to load some inline data into a store. Its contents are lost in every page
refresh, it can be useful to load temporary data.
SessionStorageProxy
MemoryProxy
LocalStorageProxy
What is the default value of the hideMode
option for Ext.grid.column.Column?
null
offsets
display
visibility
The ________ validation varifies is the value
is present (0(zero) is a valid value,but an empty string is not).
inclusion
length
exclusion
format
presence
What is the difference between a GridPanel and
an EditorGridPanel?
The EditorGridPanel extends the GridPanel Class to
provide cell editing on selected columns.
The EditorGridPanel can have more columns in it.
The GridPanel is smaller.
The EditorGridPanel is slower to start up.
Ext.util.Sorter can only be applied to which
object?
Ext.grid.Panel
Ext.data.Store
none of the above
Ext.grid.column.Column
Which one of the following layout types is
used for forms that have controls with labels above them laid out vertically?
vbox
form
column
hbox
What is the proper syntax to set up global
theme variables in Ext?
##variableName = value
$global = value
$variable-name: value !default;
&variable = value
What method can be use to retrieve a DOM
element?
Ext.getCmp()
Ext.getElementById()
Ext.get()
Ext.getDom()
Which of the following statements about the
collapseMode option is incorrect?
true' is one of the supported config value
mini' is one of the supported config value
The collapsible option must be true for this option
to take effect
This feature is only effective when the panel is a
child item of border layout
Which statement about the emptyCellText is
false?
triggers when cell has a value of undefined or null
triggers when cell has a value of undefined, null,
or ''
defaults to  
default to
Which of the following statement is false?
a child component cane be added to a parent
container
a child container can be added to a parent
component
there can only be 1 viewport per page
a child container can be added to a parent
container
What is the event name that fires when a user
checks a checkbox in Ext 4.0?
change
click
select
check
If the value of the raw data is 123456.789,
what pattern for Ext.util.Format.numberRenderer() will return 123,456.78?
0,0.0:2
0,0.00
0
#,###.00
What is the name of the event that fires when
the user activates a combobox by clicking on it?
select
load
focus
click
Linking Models: There are two types of
Associations between Models: belongsTo and hasMany. But one represents a many
to one association with another model.
hasMany
belongsTo
The ____________ validation verifies if the
given value does not match with one of the given values of the list
inclusion
format
exclusion
length
presence
What is the base class for grid panel?
Ext.panel.Panel
Ext.grid.Panel
Ext.container.Container
Ext.panel.Table
Which of the follow is not a supported data
store?
XmlStore
ArrayStore
MemoryStore
AbstractStore
Which of the following xtype(s) defines a grid
column?
column and gridcolumn
gridcolumn
column
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