Using wkhtmltopdf to print gantt

Has anyone used wkhtmltopdf to print dhtmlx gantt? I get the gantt task and other columns on the left in the pdf, but the gantt chart is not rendered in the pdf. I am using the command with the following options

wkhtmltopdf --no-pdf-compression --disable-external-links --disable-internal-links --background --no-stop-slow-scripts --debug-javascript --page-size A0 “” --javascript-delay 10000 test.pdf

Any pointers/suggestions will be helpful. Thanks

Instead of wkhtmltopdf you can try to use phantomJS