Generate PDF in base64 with jsPDF

pdf.js

services.factory('PDF', ['$q', function ($q) {

    var createSubtopic = function (doc, subtopic, top, pageWidth) {

        doc.autoTable([
            { title: "Title", dataKey: "title" },
            { title: "Value", dataKey: "value" }
        ], [
            { title: "Estándar", value: subtopic.standard },
            { title: "Tema", value: subtopic.topic },
            { title: "Subtema", value: subtopic.subtopic }
        ], {
            drawHeaderRow: function () {
                return false;
            },
            columnStyles: {
                title: { fillColor: [41, 128, 185], textColor: 255, fontStyle: 'bold' }
            },
            startY: top,
            pageBreak: 'avoid'
        });

        var skills = ["Generales:", subtopic.generalSkills, "Específicas:", subtopic.specificSkills];
        var totalRows = skills.length > subtopic.performances.length ? skills.length : subtopic.performances.length;

        var rows = [];

        for (var i = 0; i < totalRows; i++) {

            var performance = subtopic.performances[i];

            rows.push([
                performance ? "- " + performance : "",
                skills[i] || ""
            ]);
        }

        doc.autoTable(
                ["Desempeños", "Competencias"],
                rows,
                {
                    pageBreak: 'avoid',
                    styles: {
                        columnWidth: (pageWidth / 2),
                        overflow: 'linebreak'
                    },
                    startY: doc.autoTableEndPosY(),
                    drawCell: function (cell, data) {

                        if (data.row.index % 2 == 0 && data.column.dataKey == 1) {
                            doc.setFontStyle('bold');
                            doc.setFontSize(13);
                            //doc.rect(cell.x, cell.y, data.table.width / 2, cell.height, 'S');
                            doc.autoTableText(data.row.raw[1], data.settings.margin.left + data.table.width - data.table.width / 4, cell.y + cell.height / 2, {
                                halign: 'center',
                                valign: 'middle'
                            });
                            return false;
                        }
                    }
                }
            );
    };

    return {
        generatePDF: function (date, area, degree, group, time, myClassNumber, classNumber, subtopics, totalTime, phases, note, environment) {

            var deferred = $q.defer();

            var sizeA4 = {
                width: 595.28,
                height: 841.89
            };
            var doc = new jsPDF('p', 'pt');

            /*doc.setProperties({
                title: 'Title',
                subject: 'This is the subject',
                author: 'James Hall',
                keywords: 'generated, javascript, web 2.0, ajax',
                creator: 'MEEE'
            });*/

            var pageWidth = doc.internal.pageSize.width - 80;

            doc.autoTable(
                ["Fecha", "Área", "Grado", "Salón"],
                [
                    [date, area, degree, group]
                ],
                {
                    styles: {
                        columnWidth: (pageWidth / 4)
                    }
                }
            );
            doc.autoTable(
                ["Hora", "Mi Clase", "Clase Santillana"],
                [
                    [moment(time).format("h:mm a"), myClassNumber, classNumber]
                ],
                {
                    styles: {
                        columnWidth: (pageWidth / 3)
                    },
                    startY: doc.autoTableEndPosY()
                }
            );

            doc.setFontSize(26);
            doc.text(40, doc.autoTableEndPosY() + 40, "Subtemas");

            createSubtopic(doc, subtopics[0], doc.autoTableEndPosY() + 60, pageWidth);

            for (var i = 1; i < subtopics.length; i++) {

                var subtopic = subtopics[i];

                createSubtopic(doc, subtopic, doc.autoTableEndPosY() + 20, pageWidth);
            }

            var lastPosY = doc.autoTableEndPosY();

            doc.setFontSize(18);
            doc.text(40, lastPosY += 40, "Tiempo de Clase: " + totalTime + " minutos");

            doc.setFontSize(26);
            doc.text(40, lastPosY += 50, "Actividades");

            for (var i = 0; i < phases.length; i++) {
                var phase = phases[i];

                lastPosY += 40;

                doc.setFontSize(18);
                doc.text(40, lastPosY, phase.name);

                doc.autoTable(
                    [{ title: "Recurso", dataKey: "name" }, 
                     { title: "Actividad", dataKey: "description" }, 
                     { title: "Tiempo (minutos)", dataKey: "time" }],
                    phase.activities,
                    {
                        styles: {
                            columnWidth: (pageWidth / 3),
                            overflow: 'linebreak'
                        },
                        startY: lastPosY + 10
                    }
                );

                lastPosY = doc.autoTableEndPosY();
            }

            doc.autoTable(
                ["Apuntes de la clase", "Ambiente de aprendizaje"],
                [
                    [note, ""]
                ],
                {
                    styles: {
                        columnWidth: (pageWidth / 2)
                    },
                    bodyStyles:{
                        rowHeight: 200,
                        overflow: 'linebreak'
                    },
                    startY: lastPosY + 40
                }
            );

            convertToDataURLviaCanvas(environment.Image, function(base64Img){
                // Base64DataURL

                doc.addImage(base64Img, 'PNG', (pageWidth / 2)+60, doc.autoTableEndPosY() - 190, 220, 170);
                deferred.resolve(doc.output('datauristring'));
            }, 'image/png');


            return deferred.promise;
        }
    };
} ]);

Tanks this is great...
doc.output('datauristring')

@CusProjects other example with NativeScript! 👍 https://play.nativescript.org/?template=play-ng&id=OGrw9s&v=8