JavaScript.EvaluateScript

Evaluate a string of JavaScript code.

Parameters

Parameter	Description	Example	Flags
JavaScriptContext	The reference number of the javascript context.	$Context
Script	The script to evaluate.
URL	The source URL for this script. A URL for the script's source file. Used by debuggers and when reporting exceptions. This parameter is informative only: it does not change the behavior of the script.		Optional
startingLineNumber	An integer value specifying the script's starting line number in the file located at sourceURL. This is only used when reporting exceptions. The value is one-based, so the first line is line 1 and invalid values are clamped to 1.	1	Optional

Result

Returns text or error.

Description

Examples

Set variables and use them in the script:

Set Variable [ $js ; Value: MBS( "JavaScript.New" ) ]
Set Variable [ $r ; Value: MBS( "JavaScript.SetProperty"; $js; "FirstName"; "Joe" ) ]
Set Variable [ $r ; Value: MBS( "JavaScript.SetProperty"; $js; "LastName"; "Miller" ) ]
Set Variable [ $r ; Value: MBS( "JavaScript.EvaluateScript"; $js; "FirstName + ' ' + LastName;" ) ]
Show Custom Dialog [ "Result" ; $r ]
Set Variable [ $r ; Value: MBS( "JavaScript.Release"; $js ) ]

Evaluate in javascript the FileMaker get function:

Set Variable [ $js ; Value: MBS( "JavaScript.New" ) ]
Set Variable [ $r ; Value: MBS( "JavaScript.RegisterEvaluateFunction"; $js; "FMEvaluate" ) ]
Set Variable [ $r ; Value: MBS( "JavaScript.EvaluateScript"; $js; "FMEvaluate('Get(AccountName)') + ' from javascript'") ]
Show Custom Dialog [ "Result" ; $r ]
Set Variable [ $r ; Value: MBS( "JavaScript.Release"; $js ) ]

Defines and runs a function in JavaScript:

Let([
f = "
function makeCRCTable(){
        var c;
        var crcTable = [];
        for(var n =0; n < 256; n++){
                c = n;
                for(var k =0; k < 8; k++){
                        c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
                }
                crcTable[n] = c;
        }
        return crcTable;
}

function crc32(str) {
        var crcTable = crcTable || (crcTable = makeCRCTable());
        var crc = 0 ^ (-1);

        for (var i = 0; i < str.length; i++ ) {
                crc = (crc >>> 8) ^ crcTable[(crc ^ str.charCodeAt(i)) & 0xFF];
        }

        return (crc ^ (-1)) >>> 0;
};

crc32(InputValue);";
j = MBS( "JavaScript.New" );
r = MBS( "JavaScript.SetProperty"; j; "InputValue"; "Hello World" );
r = MBS( "JavaScript.EvaluateScript"; j; f );
x = MBS( "JavaScript.Release"; j )
];r)

Use trimStart(), a feature from ECMAScript 2019:

Set Variable [ $js ; Value: MBS("JavaScript.New") ]
Set Variable [ $r ; Value: MBS("JavaScript.evaluateScript"; $js; "const greeting = ' Hello world! '; greeting.trimStart();") ]
Set Variable [ $r ; Value: MBS("JavaScript.Release"; $js) ]

See also

• JavaScript.New
• JavaScript.RegisterEvaluateFunction
• JavaScript.Release
• JavaScript.SetProperty
• JS.Evaluate
• JS.EvaluateToString
• WebView.Evaluate
• WebView.RunJavaScript

Example Databases

• JavaScript/RichTextToJSON

Blog Entries

• Using JavaScript with WebKit on FileMaker Server on Linux

This function checks for a license.

Created 5th November 2015, last changed 9th February 2023

JavaScript.CheckScriptSyntax - JavaScript.GetProperty