Jspdf: How to set bottom and top margin for addImage

[bjraj]

I am using the below code to to generate pdf. I can set top margin in first page but I could not found a way to set bottom margin in first page. In second page I could not set the both top and bottom margin. please suggest a way.
function generatePdf(divId)
{
var doc = new jsPDF('p', 'mm');
var elemen = document.getElementById(divId);
html2canvas((elemen), {
onrendered: function(canvas) {
var imgData = canvas.toDataURL(
'image/png');
var d = new Date();
var n = d.toLocaleDateString();
doc.page=1; // use this as a counter.
function footer(){
doc.setFontSize(8);
doc.text(185,295, n); //print number bottom right
doc.page ++;
};
var imgWidth = 160;
var pageHeight = 297;
var imgHeight = canvas.height * imgWidth / canvas.width;
var heightLeft = imgHeight;
var position = 0;
doc.addImage(imgData, 'PNG',25, 10, imgWidth, imgHeight);
footer();
heightLeft -= pageHeight;
while (heightLeft >= 0) {
position = heightLeft - imgHeight;
doc.addPage();
doc.addImage(imgData, 'PNG', 25, position, imgWidth, imgHeight);
footer();
heightLeft -= pageHeight;
}
doc.save('sample-file.pdf');
}
});
}

[lahotiarpit]

@bjraj @arasabbasi Have you got any solution to add Margin from second page onwards

[libofeng]

You can do the paging based on the canvas. That means use "getImageData" from the canvas and create a new one for the content to the page.

    var getPageCanvas = function(canvas, pageWidth, pageHeight, pageNo){
        var pageImageWidth = canvas.width;
        var pageImageHeight = pageHeight * pageImageWidth/pageWidth;

        var ctx = canvas.getContext('2d');
        var buffer = ctx.getImageData(0, pageNo * pageImageHeight, pageImageWidth, pageImageHeight);
        var pageCanvas = document.createElement('canvas');
        pageCanvas.width = pageImageWidth;
        pageCanvas.height = pageImageHeight;
        var pageCanvasCtx = pageCanvas.getContext('2d');
        pageCanvasCtx.putImageData(buffer, 0, 0);

        return pageCanvas;
    };

And repeatedly add the new canvas to the document.