[Solved]-Highcharts - issue about full chart width-Highcharts

I know this is an old question, but I ran into the exact same issue and found another solution that works great.

As of Highcharts 4.1.5 (could be in older versions as well), the chart object has a reflow() function. View the documentation here.

reflow ()

Reflows the chart to its container. By default, the chart reflows automatically to its container following a window.resize event, as per the chart.reflow option. However, there are no reliable events for div resize, so if the container is resized without a window resize event, this must be called explicitly.

Hope it helps someone else.