Multiple pages in htmlcanvas and jspdf

In my code I decrease the (dynamic) content to the default a4 and export to pdf, only it appears in only 1 page, that is, if I retune a large content, the page is cut. I would like the image to be cropped and appear on the following pages follow the code:

    var cache_width = $('#toda').width(); //Criado um cache do CSS
    var a4  =[ 595.28,  841.89]; // Widht e Height de uma folha a4

    function getPDF(){
    // Setar o width da div no formato a4
    $("#toda").width((a4[0]*1.33333) -80).css('max-width','none');

    // Aqui ele cria a imagem e cria o pdf
    html2canvas($('#toda'), {
      onrendered: function(canvas) {
        var img = canvas.toDataURL("image/png",1.0);  
        var doc = new jsPDF({unit:'px', format:'a4'});
        doc.addImage(img, 'JPEG', 20, 20);
        doc.save('NOME-DO-PDF.pdf');
        //Retorna ao CSS normal
        $('#toda').width(cache_width);
      }
    });
    }