Downloading a file in PDF format from suitelet page

Requirement

We need to download an invoice pdf from the listed invoices when clicking on the link provided against each line of invoices in suitelet page.

Solution

We can provide a suitelet link as download link. While clicking on the link, that particular invoice is downloaded in pdf format.

This can be done by using a client script and a suitelet script.

Following is the code snippet for this action. This following function is called in the download link in suitelet page.

Client script.js

function downloadInvoice(invId){
            try {

                var createLinkUrl = url.resolveScript({
                    scriptId: 'scriptId',
                    deploymentId: 'deploymentId',
                    returnExternalUrl: true,
                    params: {
                        custscriptinvid: invoiceId,
                    }

                });
              
                window.open(createLinkUrl);
                

            }

Suitelet Script.js

/**
 * @NApiVersion 2.1
 * @NScriptType Suitelet
 */
define(['N/currentRecord', 'N/ui/serverWidget','N/render','N/search'],
    /**
 * @param{currentRecord} currentRecord
 * @param{serverWidget} serverWidget
     * * @param{render} render
     * * @param{search} search
 */
    (currentRecord, serverWidget,render,search) => {
        /**
         * Defines the Suitelet script trigger point.
         * @param {Object} scriptContext
         * @param {ServerRequest} scriptContext.request - Incoming request
         * @param {ServerResponse} scriptContext.response - Suitelet response
         * @since 2015.2
         */
        const onRequest = (scriptContext) => {
            try{
                var parms = scriptContext.request.parameters.custscriptinvid;
                var downloadPdf = render.transaction({
                    entityId: parseInt(parms),
                    printMode:render.PrintMode.PDF,
                    inCustLocale: true
                })
                var docNum = search.lookupFields({
                    type:"transaction",
                    id: parseInt(parms),
                    columns: ["tranid"]
                }).tranid;

                var today=new Date();
               

                downloadPdf.name = docNum +'_' +today+ ".pdf";
                scriptContext.response.writeFile(downloadPdf, false)
            }
            catch (e) {
                log.debug('Error@On request',e)
            }
        }

        return {onRequest}

    });