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JS.New

Creates a new JavaScript engine instance.

Component Version macOS Windows Linux Server iOS SDK
JavaScript 10.0 ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
MBS( "JS.New" { ; JSRef } )   More

Parameters

Parameter Description Example Flags
JSRef The desired js reference.
Usually each one gets a number assigned, but you can create a JavaScript environment with a fixed name, so you can anywhere reference it by name.
"JS" Optional

Result

Returns JS reference number or error.

Description

Creates a new JavaScript engine instance.
This object contains all the functions and properties you defined.
Please release the object later with the JS.Release function.

Your own JavaScript engine is useful for:

If JSRef is "js", we use this one as the global JavaScript engine for custom functions and JS.CF function. See our example JavaScript Custom Functions.

When using a name for the reference number, you can use this reference anywhere you need to pass a JavaScript reference number.

Check also our JavaScriptWebKit functions for using WebKit’s JavaScript engine on macOS and iOS.

Examples

Evaluate a bit of JavaScript:

Set Variable [ $js ; Value: MBS( "JS.New" ) ]
Set Variable [ $r ; Value: MBS( "JS.Evaluate"; $js; "4+5") ]
Show Custom Dialog [ "Result" ; $r ]
Set Variable [ $r ; Value: MBS( "JS.Release"; $JS ) ]

Create named JavaScript Environment:

Set Variable [$js; MBS( "JS.New"; "js" ) ]

See also

Release notes

Example Databases

Blog Entries

This function checks for a license.

Created 7th December 2019, last changed 9th February 2023


JS.List - JS.Now

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