Has anyone got Google Charts to work?

In our survey, we are collecting some data, and then, later on, we ask some survey questions about the data.

I've been trying to display that data in a chart before the question using some javascript. So far, no joy whatsoever.

I've attached the following into the Survey Header (using Look+Feel html editor):

"script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"/script script
google.charts.load('current', {packages: ['corechart']});
/script"

(deleted the slashes in above)

And then into the individual question:

Qualtrics.SurveyEngine.addOnload(function()
{
var iDiv = document.createElement('div');
iDiv.id = 'chart_div';
iDiv.className = 'chart_div';

document.body.appendChild(iDiv);

google.charts.setOnLoadCallback(drawChart);

function drawChart() {

// usual code to create the chart //

var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}

});

Not sure where to start really. The code does run (I tested using an alert).

I'm not sure that the google charts library is loading correctly - using developer tools, I can't see that the script has been added to the header. Similarly with the 'div' I tried to create .

Looks like this is something to do with dynamic loading?

Any ideas / examples of where people have got this to work would be gratefully received.

Thanks,

Phil