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Basic ExtJs MCQ

1. A ____ in excel is like a notebook

Onenote

Workbook

Placeholder

Cell reference

Answer

Correct Answer: Workbook

Note: This Question is unanswered, help us to find answer for this one

2. What does the remove() function return?

true when removal is successful, false when removal fails

the calling component

the function does not return value

the component that was removed

Answer

Correct Answer: the component that was removed

Note: This Question is unanswered, help us to find answer for this one

3. Which of the following xtype(s) defines a grid column?

gridcolumn

column and gridcolumn

column

Answer

Correct Answer: gridcolumn

Note: This Question is unanswered, help us to find answer for this one

4. Which of the follow is not a supported data store?

ArrayStore

MemoryStore

AbstractStore

XmlStore

Answer

Correct Answer: MemoryStore

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5. Linking Models: There are two types of Associations between Models: belongsTo and hasMany. But one represents a many to one association with another model.

belongsTo

hasMany

Answer

Correct Answer: belongsTo

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6. What is the base class for grid panel?

Ext.container.Container

Ext.grid.Panel

Ext.panel.Table

Ext.panel.Panel

Answer

Correct Answer: Ext.panel.Table

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7. Which of the following statement is false?

there can only be 1 viewport per page

a child container can be added to a parent component

a child container can be added to a parent container

a child component cane be added to a parent container

Answer

Correct Answer: a child container can be added to a parent component

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8. The ____________ validation verifies if the given value does not match with one of the given values of the list

exclusion

inclusion

presence

format

length

Answer

Correct Answer: exclusion

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9. What is the name of the event that fires when the user activates a combobox by clicking on it?

load

select

click

focus

Answer

Correct Answer: focus

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10. Which of the following statements about the collapseMode option is incorrect?

mini' is one of the supported config value

true' is one of the supported config value

This feature is only effective when the panel is a child item of border layout

The collapsible option must be true for this option to take effect

Answer

Correct Answer: true' is one of the supported config value

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11. What method can be use to retrieve a DOM element?

Ext.getDom()

Ext.getElementById()

Ext.getCmp()

Ext.get()

Answer

Correct Answer: Ext.get()

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12. Which statement about the emptyCellText is false?

triggers when cell has a value of undefined, null, or ''

default to

triggers when cell has a value of undefined or null

defaults to

Answer

Correct Answer: triggers when cell has a value of undefined or null

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13. What is the event name that fires when a user checks a checkbox in Ext 4.0?

select

change

check

click

Answer

Correct Answer: change

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14. What is the proper syntax to set up global theme variables in Ext?

&variable = value

##variableName = value

$global = value

$variable-name: value !default;

Answer

Correct Answer: $variable-name: value !default;

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15. The ________ validation varifies is the value is present (0(zero) is a valid value,but an empty string is not).

length

inclusion

exclusion

presence

format

Answer

Correct Answer: presence

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16. Which one of the following layout types is used for forms that have controls with labels above them laid out vertically?

hbox

column

vbox

form

Answer

Correct Answer: form

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17. What is the default value of the hideMode option for Ext.grid.column.Column?

offsets

visibility

null

display

Answer

Correct Answer: display

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18. Which one of the following is a valid way to get DOM elements using Ext?

Ext.getCmp(id)

Ext.loadElement(id)

Ext.getElementById(id)

Ext.findElement(id)

Answer

Correct Answer: Ext.getCmp(id)

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19. To enable grid buffering,

set buffered: true on Ext.data.Store

caching: true on Ext.grid.Panel

set caching: true on Ext.data.Store

set buffered: true on Ext.grid.Panel

Answer

Correct Answer: set buffered: true on Ext.data.Store

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20. What action does the remove() function perform?

removes a component from this container

removes all components from this container

removes itself from a parent container

Answer

Correct Answer: removes a component from this container

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21. Ext.util.Sorter can only be applied to which object?

Ext.grid.Panel

Ext.data.Store

Ext.grid.column.Column

none of the above

Answer

Correct Answer: Ext.data.Store

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22. 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

exclusion

inclusion

length

format

Answer

Correct Answer: length

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23. Which of the following technique will not help improve Ext JS performance?

Remove doLayout and doComponentLayout calls

Reduce container nesting

Replace Containers with Panels

Reduce DOM reads and writes

Answer

Correct Answer: Replace Containers with Panels

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24. Which one of the following events on an Ext.data.store object fires AFTER the store is loaded?

loadComplete

load

afterLoad

postLoad

Answer

Correct Answer: load

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25. 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.

MemoryProxy

LocalStorageProxy

SessionStorageProxy

Answer

Correct Answer: MemoryProxy

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26. Which of the following is not an Ext.form.field object?

Text

Hidden

Button

ComboBox

Answer

Correct Answer: Button

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27. True or False. The constrainTo option is only applicable to 'floating' components.

True

FALSE

Answer

Correct Answer: True

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28. Which of the following xtype(s) defines a grid panel?

gridpanel

grid

grid and gridpanel

panel

Answer

Correct Answer: grid and gridpanel

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29. The correct syntax to change a theme programmatically is:

app.switchTheme(theme-name)

app.ChangeTheme(theme-name)

app.theme=theme-name

application.Themify(theme-name)

Answer

Correct Answer: app.theme=theme-name

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30. Which of the following is not a subclass of Ext.grid.column.Column?

Ext.grid.column.Number

Ext.grid.column.Boolean

Ext.grid.column.String

Ext.grid.column.Date

Answer

Correct Answer: Ext.grid.column.String

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31. What is the method to create a class in ExtJS 4.*?

Ext.create()

Ext.extend()

Ext.load()

Ext.define()

Answer

Correct Answer: Ext.define()

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32. What is the name of the method that allows a developer to remove an event listener from an object or control?

destroyEvent

disableEvent

removeEvent

Answer

Correct Answer: un

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33. Which types of objects in Ext fire an initComponent event?

components

objects

grids

panels

Answer

Correct Answer: components

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34. The ____ classes are resonsible for decoding the raw data from a server that is to be loaded into a Model instance or Store.

Readers

Store

Writers

Proxy

Jsonp Proxy

Answer

Correct Answer: Readers

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35. Which of the following is not a grid panel feature?

Grouping

Count

GroupingSummary

Summary

Answer

Correct Answer: Count

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36. What is the correct option to completely fill the width of a container?

width: ‘max’

width: 100%

flex: 1

maxWidth: true

Answer

Correct Answer: flex: 1

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37. Which of the following is not a config option of Ext.util.Sorter?

dataIndex

property

sorterFn

direction

Answer

Correct Answer: dataIndex

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38. What is that config option for changing CSS class on a column cell?

Style

tdCls

CLS

CSS

Answer

Correct Answer: tdCls

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39. What is the correct syntax to enable gridpanel text selection?

viewConfig: { enableTextSelection: true }

columns: { enableTextSelection: true }

textSelection: true

fields: { enableTextSelection: true }

Answer

Correct Answer: viewConfig: { enableTextSelection: true }

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40. Which one of the following is the correct syntax in Ext.js to make an ajax request?

Ext.Request.Ajax(options)

Ext.Ajax.request(options)

ext.ajax.request(options)

Ext.ajax.Request(options)

Answer

Correct Answer: Ext.Ajax.request(options)

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41. What is one advantage of using xtype to create objects in Ext?

more concise syntax

Reduces number of for loops

Increase cpu parallelization

Utilizes the MVC design pattern

Answer

Correct Answer: more concise syntax

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42. The ______ validation verifies if the given value matches the given regular expression.

exclusion

presence

inclusion

format

length

Answer

Correct Answer: format

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43. What is the method to instantiate a class in ExtJS 4.*?

Ext.extend()

Ext.define()

Ext.create()

Ext.load()

Answer

Correct Answer: Ext.create()

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44. What is the root class for all Ext classes?

Ext.Component

Ext.Root

Ext.Class

Ext.Base

Answer

Correct Answer: Ext.Base

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45. Linking Models: There are two types of Associations between Models: belongsTo and hasMany. But one represents a one to many ralationship between two models.

anything

belongsTo

hasMany

Answer

Correct Answer: hasMany

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46. Which of the following is a required config option for grid panel?

store

xtype

data

Answer

Correct Answer: store

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47. One of the most common components used for layout in Ext is which one of the following?

ContentArea

Grid

Panel

Combobox

Answer

Correct Answer: Panel

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48. How do you create a new class?

All these

MyApp.Class=New Ext.extend(Object,{// class functionalities here });

Ext.define = new ('MyApp.NewClass',{ // class functionalities here });

MyApp.NewClass=Ext.extend(Object,{// class functionalities here });

Ext.define ('MyApp.NewClass',{ // class functionalities here });

Answer

Correct Answer: Ext.define ('MyApp.NewClass',{ // class functionalities here });

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49. In a form layout, what is the name of the property that will automatically create a label above a control if set?

fieldLabel

componentLabel

showLabel

LabelTitle

Answer

Correct Answer: fieldLabel

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50. 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 } ]

Answer

Correct Answer: columns: [ {text:'Name', dataIndex:'name', flex:1 } ]

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51. Which of the following is not a valid way to add an event listener?

use events config option

use addListener() function

use listeners config option

use on() function

Answer

Correct Answer: use events config option

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52. 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

clickingEditCount

editingClicks

Answer

Correct Answer: clicksToEdit

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53. Which function would a developer use to select only certain child elements of an Ext.element?

Ext.select()

Ext.filter()

Ext.scrape()

Ext.trimDown()

Answer

Correct Answer: Ext.select()

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54. Why would a developer use an ArrayStore?

To create multi-dimensional stores.

To create a store that can't use JSON.

To facilitate the creation of stores from arrays of data.

To create multiple stores chained together into one store.

Answer

Correct Answer: To facilitate the creation of stores from arrays of data.

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55. What is the shorthand function for addListener()?

add()

on()

live()

trigger()

Answer

Correct Answer: on()

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56. What is the name of the control in Ext, that will create a control similar to an html <select>?

combinationBox

comboBox

multiSelectBox

DropDownList

Answer

Correct Answer: comboBox

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57. Which of the following is NOT a valid way to add an event listener to an Ext.Panel?

panelObject.on("eventName",handler)

In the panel's config, define the listeners property.

addListener( eventName, handler, [scope], [options] )

provideListener(eventName,handler,scope, options)

Answer

Correct Answer: provideListener(eventName,handler,scope, options)

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58. What is the name of the Ext utility function to convert a JSON string into an object?

Ext.JSON.string.translate(json)

Ext.JSON.toObject(json)

Ext.JSON.convert(json)

Ext.JSON.decode(json)

Answer

Correct Answer: Ext.JSON.decode(json)

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59. Which of the following is not an Ext layout type?

vBox

float

border

fit

Answer

Correct Answer: float

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60. How is Ext JS licensed?

Commercial Software

Proprietary Software

Open Source

Commercial Software and Open Source

Answer

Correct Answer: Commercial Software and Open Source

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61. Which of the following is a required config option for grid column?

itemId

data

dataIndex

Answer

Correct Answer: dataIndex

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62. What plugin is required for cell editing?

Ext.grid.plugin.CellEditing

Ext.grid.plugin.Editing

Ext.plugin.Editing

Ext.grid.plugin.RowEditing

Answer

Correct Answer: Ext.grid.plugin.CellEditing

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63. The _______ is responsible for encapsulating the Model and can also configure a proxy to load or save the data.

JsonWriter

Store

Writers

Readers

XmlWriter

Answer

Correct Answer: Store

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64. Which config option is used to bound a component within the dimension of another container?

constrainTo

locked

constrain

lock

Answer

Correct Answer: constrainTo

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65. The ________ is a useful proxy when you need to make request to a different domain, on which your application is not deployed.

JsonP proxy

readers

writers

JsonWriter

stores

Answer

Correct Answer: JsonP proxy

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66. 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.

Anchor layout

Accordion layout

Absolute layout

HBox layout

Answer

Correct Answer: Accordion layout

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67. What is the name of the class that provides the developer with an area autosized to the browser viewport?

Ext.window

Ext.HTMLElement

Ext.fullSizeWindow

Ext.container.Viewport

Answer

Correct Answer: Ext.container.Viewport

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68. The utility method "Ext.define" is used for which one of the following?

To create a class in Ext that extends and optionally overrides the methods and properties of a parent class.

To define a global variable.

To create a user-defined control.

To define an enumeration.

Answer

Correct Answer: To create a class in Ext that extends and optionally overrides the methods and properties of a parent class.

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69. Which of the following parameter type(s) is a valid renderTo config option value?

All of the these

id of element

DOM element

extJS element

Answer

Correct Answer: All of the these

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70. Extjs 4.x is Sencha's latest JavaScript framework for developing cross-platform web applications

False

True

Answer

Correct Answer: True

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71. How would a developer set a control to hidden in Ext?

doVisible(false)

becomeHidden(true)

setVisible(false)

makeVisible(false)

Answer

Correct Answer: setVisible(false)

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72. True or False. There can only be one locked column.

False

TRUE

Answer

Correct Answer: False

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73. The _____ organizes its children horizontally across the container.

Anchor layout

Accordion layout

Absolute layout

HBox layout

Answer

Correct Answer: HBox layout

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74. 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?

onReadyToGo

onDocumentReady

onBeforePageLoaded

onBeforeLoaded

Answer

Correct Answer: onDocumentReady

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75. 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 Ext run in turbo-mode.

To increase the number of controls allowed on a page.

To make a small, airborn insect appear in the DOM.

Answer

Correct Answer: In a situation where a developer would be calling a repetitive,atomic function on many different elements and needs to reduce the memory footprint.

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76. Why would a developer use a JsonPStore instead of a JsonStore?

To create a store that has data with no flaws in it.

To facilitate the creation of a store in Ext that would allow for cross-site requests of JSON data.

JsonPStores work better with server side JSON.

A JsonP store can hold more data than a JsonStore.

Answer

Correct Answer: To facilitate the creation of a store in Ext that would allow for cross-site requests of JSON data.

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77. 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.RadioTeam

Ext.form.Radio

Ext.form.CheckBox

Ext.form.RadioGroup

Answer

Correct Answer: Ext.form.RadioGroup

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78. What region type is required for border layout?

Center

North

East

No region type is required

South

Answer

Correct Answer: No region type is required

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79. What is the difference between theming and styling in Ext?

Themes are only one file, styles require many files.

Themes are more visually appealing.

Theming is differentiated from "styling" by the ability to flip a switch and change the theme.

Themes are cheaper than styles.

Answer

Correct Answer: Theming is differentiated from "styling" by the ability to flip a switch and change the theme.

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80. What are the 4 folders that a developer should create to employ the recommended MVC architecture in Ext?

Clicks,Selects,Changes,Checks

Controls,Views,UIs,Events

Models,Views,Animations,HTML

Models,Views,Controllers,Stores

Answer

Correct Answer: Models,Views,Controllers,Stores

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81. What is a RESTful store in Ext?

A store that allows the user to slowly browser a website.

A store that allows for cross-site scripting.

A store that slows when the demand is too much on the server's hardware.

A stores that supports a convenient way to interface with a RESTful web service.

Answer

Correct Answer: A stores that supports a convenient way to interface with a RESTful web service.

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82. What is theme inheritance?

Creating themes that are passed from one developer to another.

Creating themes that have similar colors.

Making your themes object oriented.

Setting up your theme to extend or inherit from a base theme so as to include all the necessary classes to work properly.

Answer

Correct Answer: Setting up your theme to extend or inherit from a base theme so as to include all the necessary classes to work properly.

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83. With Sandbox mode you can run Extjs 4 alongside with previous versions of Extjs on the same page.

False

True

Answer

Correct Answer: True

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84. Why would a developer use a Pager?

To make ComboBoxes display faster.

To alert users of problems with their data.

To more quickly display and load large amounts of data in a GridPanel.

To simulate an e-Reader.

Answer

Correct Answer: To more quickly display and load large amounts of data in a GridPanel.

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85. 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

Answer

Correct Answer: True

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86. True or false? Ext Js supports all major web browsers including: IE 6+,Firefox 1.5+(Pc,Mac),Safari 3+,Opera9+(Pc,Mac).

True

False

Answer

Correct Answer: True

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87. What is the name of the method on an Ext.data.store that synchronizes the records in the store with a remote data source?

load

upload

sync

download

Answer

Correct Answer: sync

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88. The LocalStorageProxy uses the new HTLM5 localStorage API to load and save data into the client brwoser

False

True

Answer

Correct Answer: True

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89. Extjs 4.x includes a new pattern concept named MVC.

True

False

Answer

Correct Answer: True

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90. Why would a developer use buffered scrolling?

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 all the UI interactions run at 120 fps.

Buffered scrolling makes the interface much shinier.

Answer

Correct Answer: Buffered scrolling enables a developer to load any number of records into a grid without paging.

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91. is it possible to migrate from Extjs 3 to Extjs 4?

False

True

Answer

Correct Answer: True

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92. What data proxy does Ext support?

All of the above

AJAX

JSON-P

REST

Answer

Correct Answer: All of the above

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93. Which one of the following is true about the Ext viewport?

The viewport can only have 4 items in it.

The viewport does not allow a different layout type to be specified.

The viewport has a 4px black border by default.

The viewport automatically re-sizes itself to the size of the browser viewport.

Answer

Correct Answer: The viewport automatically re-sizes itself to the size of the browser viewport.

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94. 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 EditorGridPanel is slower to start up.

The GridPanel is smaller.

Answer

Correct Answer: The EditorGridPanel extends the GridPanel Class to provide cell editing on selected columns.

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95. is Extjs a cross-browser RIA framework?

True

False

Answer

Correct Answer: True

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96. 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.addClass() has better performance.

Ext.removeClass() has better performance.

Answer

Correct Answer: Ext.addClass() will add the class to a DOM object whereas Ext.removeClass() will remove a class from a DOM object.

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97. Ext JS is a JavaScript library for developing interactive web applications using technologies such as AJAX, DHTML and DOM. It was developed by Sencha.

True

False

Answer

Correct Answer: True

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98. In Ext, what is a proxy?

Proxies are dummy controls that handle the events such as a click event in lieu of the actual control.

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 hold the values for the real controls.

Proxies are members of the Ext support staff will write your code for you.

Answer

Correct Answer: 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.

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99. 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.draw.Component

Ext.chart.Chart

Ext.ComponentQuery

Answer

Correct Answer: Ext.ComponentQuery

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100. 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() makes the CPU spin faster than Ext.getDom().

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.

Answer

Correct Answer: 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.

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