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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 16:01, 23 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
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().