Scripting: Difference between revisions

Jump to navigation Jump to search

Scripting (view source)

Revision as of 08:12, 24 April 2021

234 bytes added ,  24 April 2021
m
no edit summary
mNo edit summary
mNo edit summary
(4 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{Stamp|2021-04-13-23|4.10.0|1.10.0}}
{{Stamp|2021-04-13-23|4.10.0|1.10.0}}


{{NoteLine| '''''THIS PAGE IS ACTIVELY UNDER DEVELOPMENT & WILL BE UPDATED DIRECTLY.''' Please be patient.''}}
== Native Memento Calculation scripting ==
== Native Memento Calculation scripting ==
Scripting for the Calculation field type is described in '''[[Calculation field]]'''.
Scripting for the Calculation field type is described in '''[[Calculation field]]'''.
Line 8: Line 9:


=== 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 came before it, the JavaScript field exists to produce ("return") a value calculated with an ''expression'' or formula. JavaScript fields use a somewhat simplified form of Memento JavaScript. For instance, it assumes the current entry for its context, while in full Memento JavaScript, the script must locate & provide the entry to operate on. While it can access any field in any library the current library is linked to, it doesn't have the complexity to access any field in any entry in any library, as you can in full Memento JavaScript. See [[How:Write scripts in JavaScript for Memento#JavaScript field]] for a detailed discussing of the JavaScript field.


==== Example scripts ====
==== Example JavaScript field usage ====
:;123: the value ''a hundred and twenty-three''
* The field() function gets the value of the field from Memento.
:;"Memento": the characters ''M e m e n t o'' as a string
* Anything after "//" is ignored, so you can use it for comments.
:; 2 * currentWeight: If currentWeight is 23 lbs, then 46 lbs
* For numbers, x * y means the numerical ''product'' of x times y.
:; (hours * 60) + 10:If hours is 5 and minutes is 10, then 310
* x = y means for Memento to assign to x the value of y.
 
* For numbers, x + y means the ''sum'' of x and y, while if x & y are strings of text, it means x ''concatenated'' with y.
==== Terminology ====
:; Item price    // ''on an invoice'':field("Unit price") * field("Quantity")
:; Constant:a value that has a string (text) value or a numeric (number) value.
:; Amount for display    // ''Final sum'': field("Total") + " widgets"
<small>
:; Limited&nbsp;&nbsp;&nbsp;&nbsp;// ''The capped amount'': value = field("Value"); if (value <= StandardLimit) value else StandardLimit
::; 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''
</small>
:; 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 scripting for [[Triggers|'''Memento Triggers''']] ===
=== JavaScript scripting for [[Triggers|'''Memento Triggers''']] ===
Retrieved from "https://wiki.mementodatabase.com/index.php?title=Special:MobileDiff/3225...3236"

Navigation menu