salix/print/templates/reports/collection-label/collection-label.js

const jsBarcode = require('jsbarcode');
const {DOMImplementation, XMLSerializer} = require('xmldom');
const UserError = require('vn-loopback/util/user-error');

module.exports = {
    name: 'collection-label',
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The ticket or collection id'
        }
    },
    async serverPrefetch() {
        let ticketIds;
        const res = await this.rawSqlFromDef('tickets', [this.id]);

        if (res.length) {
            ticketIds = [];
            for (const row of res)
                ticketIds.push(row.ticketFk);
        } else
            ticketIds = [this.id];

        this.labelsData = await this.rawSqlFromDef('labelsData', [ticketIds]);

        if (!this.labelsData.length)
            throw new UserError('Empty data source');
    },
    methods: {
        getBarcode(id) {
            const xmlSerializer = new XMLSerializer();
            const document = new DOMImplementation().createDocument('http://www.w3.org/1999/xhtml', 'html', null);
            const svgNode = document.createElementNS('http://www.w3.org/2000/svg', 'svg');

            jsBarcode(svgNode, id, {
                xmlDocument: document,
                format: 'code128',
                displayValue: false,
                width: 3.8,
                height: 110,
            });
            return xmlSerializer.serializeToString(svgNode);
        },
    }
};