N/ui/serverWidget Module
AssistantStep.getLineCount()
Method Description: Gets the number of lines on a sublist in a step. The first line number on a sublist is 0 (not 1).
Returns: number (the count of line items on a sublist) if the sublist does not exist, -1 is returned.
Supported Script Types: SuiteScript 2.0 Suitelet Script Type and SuiteScript 2.0 User Event Script Type (beforeLoad(scriptContext))
Governance: None
Module: N/ui/serverWidget Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=AssistantStep.getLineCount(options)

// Code Example 1

//Add additional code

//...

var assistant = serverWidget.createAssistant({

    title : 'Simple Assistant'

});

var assistantStep = assistant.addStep({

    id : 'idname',

    label : 'Sample label'

});

var sublist = assistant.addSublist({

    id : 'sublistid',

    type : serverWidget.SublistType.INLINEEDITOR,

    label : 'Editor'

});

var numLines = assistantStep.getLineCount({

    group : 'sublistid'

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4334385888.html