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Chapter1:Introduction
6
environment. I reasoned that there are many experienced Excel
VBAprogrammersaroundwhomightfeelsimilarlysothatiswhy
Iwrote thisbook.There areofcourse nowmanypeoplewhouse
GoogleproductswhoarefamiliarwithJavaScriptbutwhomaynot
knowmuchaboutspreadsheets.Thisbookmightalsobeofinterest
tothisgroupofusers.Thisbookassumesprogrammingknowledge
insomeprogramminglanguagethoughnotnecessarilyJavaScript.
1.7 Book CodeAvailableOnGitHub
The emphasis on this book ison practical code examples. Some
of the code examples are short and only practical in the sense
thatthey exemplify aGAS feature. GAS is a “moving target” in
that new features are added and deprecated frequently thereby
making it difficult to keep all code up-to-date. At the time of
writing,alltheexamplesworkedasexpectedbutpleaseemailme²
ifsomethingisbrokenorifyougetawarningofsomethinghaving
been deprecated. To allow readers to follow along, I have tried
to document the code extensively usingJSDoc³ and in-line code
comments. Toruntheexamples, youcancopyandpastefromthe
book to the GAS ScriptEditor. This will work but I recommend
getting thecodefromGitHub. Allthe code examplesinthisbook
are available on a Github repository created specifically for this
updated version of the book. The user name is Rotifer and the
repository name is GoogleSpreadsheetProgramming_2015. The
fullURLishere.⁴YoucanusetheGitcommandlinetooltocheckout
therepositorytoyourlocalmachineor simplycopythe examples
directlyfromtheGitHubrepository.
²
mick@javascript-spreadsheet-programming.com
³
usejsdoc.org/
https://github.com/Rotifer/GoogleSpreadsheetProgramming_2015
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Chapter1:Introduction
7
1.8 My Blog On GoogleSpreadsheet
Programming
Imaintainablog⁵thatpre-datesthisbook. Theblogbeganinlate
2010sosomeoftheearlyexamplesusedeprecatedorunsupported
features. That said, the blog inspired this book and is actively
maintained so itcan be viewed as a complementary resource to
thisbook. Itisworthchecking for newentriesfromtime totime
because I use ittoexploreanddiscussnewspreadsheetandGAS
featuresandIcoversomemoreadvancedJavaScriptmaterialthere.
1.8Guideline OnUsingThisBook
Ilearnbestfromexamplessothisbookisheavilyexample-driven.
I first like to see something working and then examine it and
learnfromit.Inordertoderive maximumbenefitfromthisbook,
it is important to execute the code fromyour own spreadsheets.
Readthebookdescriptionsandcode documentationcarefullyand
make sure thatyou understand both the objective ofthe code as
well as how it works. Chapter 3 goes in to some depth on core
JavaScriptconceptssuchasfunctions,arraysandobjectsbutifyou
are relativelyinexperienced in JavaScript, thensome background
readingwillhelpenormously.Remember,GASisJavaScriptsothe
betteryouunderstandJavaScript,thebetteryouwillbe atwriting
andunderstandingGAS.Donotbeafraidtoexperimentwithcode,
changeorre-writemyexamplesatwill!Ifyoufindbetterwaysof
doingthings,pleaseletmeknow!
http://www.javascript-spreadsheet-programming.com
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Chapter1:Introduction
8
1.9 2015 Update Notes
ThefirstversionofthisbookwasreleasedinNovember2013andthe
feedbackI havereceivedonithasbeenlargelypositive. However,
Irealisethatsomeofthematerialisnowout-of-date.Forexample,
UiApp andDocsList have bothbeendeprecatedsince thatversion
of the book was released. I am also aware that the book could
beimprovedbybetterexplanations,betterexamplesandgenerally
better writing. I hope this version delivers abetter productto its
readers.
AsIstatedearlier,GoogleSheetsandGASare“movingtargets”that
aresubjecttoconstantchange.Iintendtoreleaseanewversionof
thisbookyearlyfromnowonsothatthematerialremainscurrent
andtheoverallqualityofthebookimproves.Iwillcontinuetoblog
aboutnewfeaturesandtopicsthatI have notcoveredso farand,
iftheselooklikeagoodfitandattractinterestfromreaders,Iwill
incorporatesuchsubjectsintolaterversionofthebook.
SomethingIfindannoyingandexpensiveiswhenIbuyatechnical
bookonlytolearnafewmonthslater thataneweditionhasbeen
released.I haveoneshellprogrammingbookfrom1990thatIstill
usebutshellprogrammingisoneofthefewstabletechnologiesthat
Iuse (SQLisanother, yes, featuresareaddedbutthe coreisquite
stable).MosttechnicalbooksthatIhaveboughtinthepastbecome
obsolete,atleastinpart,inayearortwo.Myideawiththisbookis
tomakesurethosewhobuyitoncegetalltheupdatesforfreeand
Iplantokeepupdatingitindefinitely.Leanpubmakethispossible,
so abigthankstothemandthanksalso toallofyouwho bought
thefirstversionofthisbook!
TimetowritesomeGAS!
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Chapter 2: Getting Started
2.1 Introduction
The best way to learn JavaScript/Google Apps Script is to write
some code. Getting started is very straightforward: All that is
needed is a Gmail account and a browser with an Internet con-
nection. To runsome example code, firstgoto Google Drive and
create aspreadsheet.Toviewthescripteditor, selectTools->Script
editor…fromthespreadsheetmenubar.Thefirsttimeyoudothisin
anewspreadsheetfile,youwillbepresentedwithapop-upwindow
entitled “Google Apps Script”, just ignore and close it for now.
Givetheprojectaname,anynameyoulike,byhoveringoverand
replacingthetext“untitledproject”onthetopleft.Deletethecode
stub entitled“myFunction”so thatthe scripteditor isnowblank.
Pasteintheexample codeinthe followingsectionsandsave(save
iconormenuactionFile->Save).
2.2GoogleApps ScriptExamples
Herearefourexamplefunctions.Whenpastedintothescripteditor,
the code formatting applied by the editor becomes evident and
makes the code easier to read. The code for thischapter can be
viewedanddownloadedfromGitHubhere.⁶
https://github.com/Rotifer/GoogleSpreadsheetProgramming_2015/blob/master/ch02.
gs
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Chapter2:GettingStarted
10
1
function sayHelloAlert() {
2
// Declare a string literal variable.
3
var greeting 'Hello world!',
4
ui = SpreadsheetApp.getUi();
5
// Display a message dialog with the greeting
6
//(visible from the containing spreadsheet).
7
// Older versions of Sheets used Browser.msgBox()
8
ui.alert(greeting);
9
}
10
11
function helloDocument() {
12
var greeting 'Hello world!';
13
// Create DocumentApp instance.
14
var doc =
15
DocumentApp.create('test_DocumentApp');
16
// Write the greeting to a Google document.
17
doc.setText(greeting);
18
// Close the newly created document
19
doc.saveAndClose();
20
}
21
22
function helloLogger() {
23
var greeting 'Hello world!';
24
//Write the greeting to a logging window.
25
// This is visible from the script editor
26
//
window menu "View->Logs...".
27
Logger.log(greeting);
28
}
29
30
31
function helloSpreadsheet() {
32
var greeting 'Hello world!',
33
sheet = SpreadsheetApp.getActiveSheet();
34
// Post the greeting variable value to cell A1
35
// of the active sheet in the containing
Chapter2:GettingStarted
11
36
// spreadsheet.
37
sheet.getRange('A1').setValue(greeting);
38
// Using the LanguageApp write the
39
// greeting to cell:
40
// A2 in Spanish,
41
// cell A3 in German,
42
// and cell A4 in French.
43
sheet.getRange('A2')
44
.setValue(LanguageApp.translate(
45
greeting, 'en''es'));
46
sheet.getRange('A3')
47
.setValue(LanguageApp.translate(
48
greeting, 'en''de'));
49
sheet.getRange('A4')
50
.setValue(LanguageApp.translate(
51
greeting, 'en''fr'));
52
}
2.2 Executing Code –OneFunctionAt A
Time
Inorderto executecode,theremustbeatleastone validfunction
in the script editor. After pasting the code above, there are four
functionsthatwilleachbeexecutedinturn.
Chapter2:GettingStarted
12
Figure2-1: GoogleApps Script Editor displaying thecodeandthe“Select
function”drop-downlist.
Select function sayHelloAlert() from the “Select function” drop-
down liston the scripteditor toolbar andthen pressthe execute
icon(to the leftofthe function listdrop-down). You will needto
authorize the scriptwhen you firsttry to execute it. Subsequent
executionsdonotrequireauthorisation.Onceauthorised,switchto
thespreadsheetandyouwillseeasmallwindowwiththegreeting
“Hello world”. These browser popup displaysare modal meaning
thattheyblockallsubsequentcodeexecutionuntiltheyareclosed.
Forthisreason,theiruseshouldbelimited.TheLoggerisgenerally
abettertoolforwritinganddisplayingoutput.
New SheetsFeature
Browser.msgBox instead of alert() is used in older
versionsandstillworks.
Chapter2:GettingStarted
13
Nowselectthe second function namedhelloDocument() andexe-
cuteit.Thisisamuchmore interestingexamplethantheprevious
onebecause itshowshowGASwritteninone applicationcanbe
used to manipulate other applications. The first time you try to
executeit,youwillgetamessagesaying,“Authorizationrequired”.
Once you authorise it and then execute, it will create a new
GoogleDocumentandwritethemessagetoit.Thisexample,though
trivial and useless, does demonstrate how GAS code written in
one application can manipulate other applications. This isavery
powerfulfeatureandwillbearecurringthemeofthisbook.
ThehelloLogger() function, whenexecuted, writesthe message to
aloggingareathatisviewablefromthescripteditormenu“View-
>Logs…”.Itisequivalenttothe“console.log”inFirebugandNode.js.
Itwillbeusedfrequentlyinlatercodeexamplesforoutputandfor
errorreporting.
ThefinalfunctionhelloSpreadsheet()demonstratestwoimportant
aspectsofGoogleAppsScript:
Firstly,spreadsheetscanbemanipulatedviatheSpreadsheetobject
(the Google documentation refers to Spreadsheet as a “class”). It
providesa methodthat returnsan object representing the active
sheet(getActiveSheet())andthatthisreturnedobjecthasamethod
thatreturnsarange(getRange()),inthisinstanceasinglecellwith
theaddress“A2”.Thereturnedrangeobjectmethod, setValue(), is
thencalledwithastringargumentthatiswrittentocellA1ofthe
activesheet.Thesetypesofchainedmethodcallslookdauntingat
first.Themethodcallchaindescribedabovecouldbere-writtenas:
Chapter2:GettingStarted
14
1
var greeting 'Hello world!',
2
activeSpreadsheet =
3
SpreadsheetApp.getActiveSpreadsheet(),
4
activeSheet =
5
activeSpreadsheet.getActiveSheet(),
6
rng = activeSheet.getRange('A1'),
7
greeting 'Hello world!';
8
rng.setValue(greeting);
Thecodeaboveusesanumberofintermediatevariablesandmay
be easier to understand initially but after experience with GAS,
thechainedmethodcallwillstarttofeeleasier andmorenatural.
Theobjectsreferencedinthisexamplewillbediscussedindetailin
chapters4and5.
Secondly, the example code showshow easyit is to call another
servicefromaGoogleAppsScriptfunction.HeretheLanguageApp
wasusedtotranslateasimpletextmessageintoSpanish,German,
andFrench.ThisabilitytoseamlesslyaccessotherGoogleservices
isextremelypowerful.
2.3 Summary
Thischapter hasshownhowto accessthe GASScriptEditor and
execute functionsfrom it. The examples demonstrated how GAS
candisplaysimplealerts,writemessagestotheLogger,manipulate
ranges in spreadsheets and use other Google applications such
as Document and Google services such as LanguageApp. These
examplesbarelyscrape thesurface ofwhatcanbe achievedusing
GAS. The nextchapter uses GAS to write user-definedfunctions
that can be called in the same manner as built-in spreadsheet
functions.
Chapter 3: User-Defined
Functions
3.1 Introduction
User-definedfunctionsallowspreadsheetusersanddevelopersto
extend spreadsheet functionality. No spreadsheet application can
caterforallrequirementsforalluserssoamechanismisprovided
thatallowsusersto write their owncustomisedfunctionsin the
hostedlanguage,bethatVBAinExcelorGASinGoogleSheets.
Definition
A user-defined function is one that can be called
usingthe equals (=) sign in a spreadsheet cell and
writesitsreturnvalueorvaluestothespreadsheet.
User-definedfunctionsarealsoknownascustomfunctionsandthis
isthetermusedbytheGoogle.
GoogleCustomFunctionDoc-
umentation
WorthReading!⁷.
The sourcecode for thischaptercanbe foundhereonGitHub.⁸I
have adoptedthe conventionofwritinguser-definedfunctionsin
https://developers.google.com/apps-script/guides/sheets/functions
https://github.com/Rotifer/GoogleSpreadsheetProgramming_2015/blob/master/ch03.
gs
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