如何使用jsPDF以PDF格式显示两页图像？ [英] How to display an image in two pages in PDF using jsPDF?

问题描述

我有一个HTML页面。我有一个按钮，当我单击此按钮时，它将使用html2canvas将整个html页面转换为数据图像，并使用jsPDF库将其放入PDF。
我正在使用的javascript是

I have a html page. In which I have a button , whenerever I click this button it will convert the entire html page into data image using html2canvas and placed it into PDF using jsPDF library. The javascript which I am using is

$("#printButton").click(function(){
html2canvas([document.getElementById('form1')], {
        onrendered: function (canvas) {
            var imageData = canvas.toDataURL('image/jpeg',1.0); 
           var doc = new jsPDF('landscape');
           doc.addImage(imageData,'JPEG',5,20,200,150);
           doc.save('Test.pdf');
     }
    });
});

它仅在第一页显示图像。但是每当html页面大小更多时，我想剪切图像数据并将其放在PDF格式的两页中。
请帮我解决这个问题。

It is displaying the image in first page only. but whenever the html page size is more, I want to cut the image data and place it in two pages in PDF. Please help me to solve this.

推荐答案

这可能不是完美的答案，但仍有效

This may not be the perfect answer but still works

                $("#btnSaveAsPDF").click(function () {
                html2canvas($("#tblSaveAsPdf_canvas"), {
                onrendered: function (canvas) {
                var imageData = canvas.toDataURL("image/jpeg");
                var image = new Image();
                image = Canvas2Image.convertToJPEG(canvas);
                var doc = new jsPDF();
                doc.addImage(imageData, 'JPEG', 12, 10);
                var croppingYPosition = 1095;
                count = (image.height) / 1095;

                for (var i =1; i < count; i++) {
                        doc.addPage();
                        var sourceX = 0;
                        var sourceY = croppingYPosition;
                        var sourceWidth = image.width;
                        var sourceHeight = 1095;
                        var destWidth = sourceWidth;
                        var destHeight = sourceHeight;
                        var destX = 0;
                        var destY = 0;
                        var canvas1 = document.createElement('canvas');
                        canvas1.setAttribute('height', destHeight);
                        canvas1.setAttribute('width', destWidth);                         
                        var ctx = canvas1.getContext("2d");
                        ctx.drawImage(image, sourceX, 
                                             sourceY,
                                             sourceWidth,
                                             sourceHeight, 
                                             destX, 
                                             destY, 
                                             destWidth, 
                                             destHeight);
                        var image2 = new Image();
                        image2 = Canvas2Image.convertToJPEG(canvas1);
                        image2Data = image2.src;
                        doc.addImage(image2Data, 'JPEG', 12, 10);
                        croppingYPosition += destHeight;              
                    }                  
                var d = new Date().toISOString().slice(0, 19).replace(/-/g, "");
                filename = 'report_' + d + '.pdf';
                doc.save(filename);
            }

        });
    });

这篇关于如何使用jsPDF以PDF格式显示两页图像？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！