How to call client script function in Suitelet

/**
 *@NApiVersion 2.x
 *@NScriptType Suitelet
 */

// this creates a Suitelet form that lets you write and send an email

define(['N/ui/serverWidget', 'N/email', 'N/runtime'],
    function(ui, email, runtime) {
        function onRequest(context) {
            if (context.request.method === 'GET') {
                var form = ui.createForm({
                    title: 'Demo Suitelet Form'
                });
                form.clientScriptModulePath = "./helloWorld.js";
                var subject = form.addField({
                    id: 'subject',
                    type: ui.FieldType.TEXT,
                    label: 'Subject'
                });
                subject.layoutType = ui.FieldLayoutType.NORMAL;
                subject.breakType = ui.FieldBreakType.STARTCOL;
                subject.isMandatory = true;
                var recipient = form.addField({
                    id: 'recipient',
                    type: ui.FieldType.EMAIL,
                    label: 'Recipient email'
                });
                recipient.isMandatory = true;
                var message = form.addField({
                    id: 'message',
                    type: ui.FieldType.TEXTAREA,
                    label: 'Message'
                });
                message.displaySize = {
                    width: 60,
                    height: 10
                };
                form.addSubmitButton({
                    label: 'Send Email'
                });
              
              	form.addButton({
                    id: 'custpage_sample_button',
                    label: 'Sample Button',
                    functionName: 'customSubmit'
                });
                context.response.writePage(form);
            } else {
                var request = context.request;
                email.send({
                    author: runtime.getCurrentUser().id,
                    recipients: request.parameters.recipient,
                    subject: request.parameters.subject,
                    body: request.parameters.message
                });
            }
        }
        return {
            onRequest: onRequest
        };
    });

You don't call Client Script functions from a Suitelet. The Suitelet runs server-side while the Client Script runs in the user's browser. They share no context.

Thanks

Looks like you're trying to wire up a button that will POST back to the Suitelet?

Yes @erictgrubaugh

I see

Thanks for the help I will look into it.

Hello there, sorry to jump into this discussion but I have an issue with functionName... It works if my variable is a string, but since mine is an object it does not seem to work... In my client script the dialog shows [object Object],[object Object],[object Object]... but my log in my suitelet is good... Any idea please? 🙏

Share your code

I don't have a specific record since I'm working on a suitelet. I can't find a way to pass my JSON to the Client Script.

Is this a UI Suitelet or a backend Suitelet?

Just to have everyone knowing, thanks to @erictgrubaugh. I created a field, set a default value and then read the value client side.