table-export/src/jspdf.js

table export, support json、csv、txt、xml、word、excel、image、pdf

var jsPDF = window.jsPDF = require('jspdf/jspdf');
require('jspdf/plugins/addimage');
(function (jsPDFAPI) {
    'use strict';
    /**
     * Renders an HTML element to canvas object which added to the PDF
     *
     * @public
     * @function
     * @param element {Mixed} HTML Element, or anything supported by html2canvas.
     * @param x {Number} starting X coordinate in jsPDF instance's declared units.
     * @param y {Number} starting Y coordinate in jsPDF instance's declared units.
     * @param options {Object} Additional options, check the code below.
     * @param callback {Function} to call when the rendering has finished.
     *
     * NOTE: Every parameter is optional except 'element' and 'callback', in such
     *       case the image is positioned at 0x0 covering the whole PDF document
     *       size. Ie, to easily take screenshots of webpages saving them to PDF.
     */
    jsPDFAPI.addDOM = function (element, x, y, options, callback) {
        var dom2canvas = require('./dom2canvas');

        if(typeof x !== 'number') {
            options = x;
            callback = y;
        }

        if(typeof options === 'function') {
            callback = options;
            options = null;
        }

        var I = this.internal, K = I.scaleFactor, W = I.pageSize.width, H = I.pageSize.height;

        options = options || {};
        options.onrendered = function(obj) {
            x = parseInt(x) || 0;
            y = parseInt(y) || 0;
            var dim = options.dim || {};
            var h = dim.h || 0;
            var w = dim.w || Math.min(W,obj.width/K) - x;

            var format = 'JPEG';
            if(options.format)
                format = options.format;

            if(obj.height > H && options.pagesplit) {
                var crop = function() {
                    var cy = 0;
                    while(1) {
                        var canvas = document.createElement('canvas');
                        canvas.width = Math.min(W*K,obj.width);
                        canvas.height = Math.min(H*K,obj.height-cy);
                        var ctx = canvas.getContext('2d');
                        ctx.drawImage(obj,0,cy,obj.width,canvas.height,0,0,canvas.width,canvas.height);
                        var args = [canvas, x,cy?0:y,canvas.width/K,canvas.height/K, format,null,'SLOW'];
                        this.addImage.apply(this, args);
                        cy += canvas.height;
                        if(cy >= obj.height) break;
                        this.addPage();
                    }
                    callback(w,cy,null,args);
                }.bind(this);
                if(obj.nodeName === 'CANVAS') {
                    var img = new Image();
                    img.onload = crop;
                    img.src = obj.toDataURL('image/png');
                    obj = img;
                } else {
                    crop();
                }
            } else {
                var alias = Math.random().toString(35);
                var args = [obj, x,y,w,h, format,alias,'SLOW'];

                this.addImage.apply(this, args);

                callback(w,h,alias,args);
            }
        }.bind(this);
        dom2canvas(element, {format: 'jpg'}, function (canvas) {
            options.onrendered(canvas);
        });
    };
})(jsPDF.API);
module.exports = jsPDF;