Difference between revisions of "Scripting"

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=== The '''[[JavaScript field]]''' type ===
 
=== The '''[[JavaScript field]]''' type ===
 
Like the Memento Calculation field type that game before it, the JavaScript field exists to produce ("return") a value calculated with an ''expression'', which is a formula consisting of ''constants'', ''variables'', ''operators'', and possibly ''statements''.
 
Like the Memento Calculation field type that game before it, the JavaScript field exists to produce ("return") a value calculated with an ''expression'', which is a formula consisting of ''constants'', ''variables'', ''operators'', and possibly ''statements''.
 +
 +
==== Example scripts ====
 +
;123: Just the value a hundred and twenty-three
 +
; 2 * currentWeight: If currentWeight is 23 lbs, then this expression has the value 46 lbs
 +
; (hours * 60) + 10:If hours is 5 and minutes if 10, then the expression has the value 310
  
 
==== Terminology ====
 
==== Terminology ====

Revision as of 02:01, 24 April 2021

« Page as of 2021-04-13-23, editions Mobile 4.10.0, Desktop 1.10.0 »

Native Memento Calculation scripting

Scripting for the Calculation field type is described in Calculation field.

Scripting Memento in JavaScript

Scripting in JavaScript is available in JavaScript field and Triggers.

The JavaScript field type

Like the Memento Calculation field type that game before it, the JavaScript field exists to produce ("return") a value calculated with an expression, which is a formula consisting of constants, variables, operators, and possibly statements.

Example scripts

123
Just the value a hundred and twenty-three
2 * currentWeight
If currentWeight is 23 lbs, then this expression has the value 46 lbs
(hours * 60) + 10
If hours is 5 and minutes if 10, then the expression has the value 310

Terminology

Constant
a value that has a string (text) value or a numeric (number) value.

String
"This is a string of textual characters"
Number
123 or 3.14 or -28.5
Symbol
a name representing a constant value, like pi, x, tareWeight, or surname

Variable
a name representing a value that may change over time, like sum, currentValue, or orderDate
Operator
one or more characters that represent the value of other values that go together in some fashion to determine a result, like + for plus or - for minus or * for multiplied by or / for divided by. :::Some operators are made up of other operators used in combination, like <= for less than or equal to or && for and also.

JavaScript field script examples

123; any numeric constant

JavaScript scripting for Memento Triggers

TBD

moment.min.js — a possibly useful wrapper for JavaScript dates & times

See http://momentjs.com and its subordinate pages Guides and Docs.

Tidbit
To get the current date, use moment().toDate(). To get the current date & time, use moment().toDate().getTime().

TBD