printOnePage(){
        document.getElementById('helpPage').style.display= 'none';
        let page = document.getElementById('appContainer');
        html2canvas(page,{
            onrendered: function(canvas) {
                $('#img_val').val(canvas.toDataURL("image/png"));
                console.log(document.getElementById('img_val'));
                //document.getElementById("phpSendForm").submit();
            }
        });
        document.getElementById('helpPage').style.display= '';

    }