This sample is a simple Google charting program named 'chart_samp.pls' that demonstrates

three basic HTML web page parts which are used to show a Google

chart in a PL/B HtmlControl object.

See the following link for information on Google charts:

https://developers.google.com/chart/interactive/docs/quick_start

The 'chart_samp.pls' program can be compiled and executed by PL/B runtimes as follows:

Plbwin and Plbclient:

The 'Microsoft Edge WebView2' control is used to display the Web content

in the HTMLCONTROL. For more information on 'WebView2', you can look in the

'PL/B Language Reference' manual under the 'WebView2 Support' sections.

Plb Web Server:

There are two simple changes that are needed to run the 'chart_samp.pls' program:

1) Edit the plbwebstartwv.html file. Comment out the

<meta http-equiv="Content-Security-Policy" ...

line and add in the

<script type='text/javascript' src='https://www.google.com/jsapi'></script>

line. This will cause the charting libraries to be loaded upon program startup.

See the example_plbwebstartwv.html file.

2) The 'chart_samp' program requires the 'Bootstrap 5' framework to be loaded and used

for enhanced appearances required for the Google charts. This can be done by

either the chart_samp program using the .plcw extension or adding the

'PLBWEB_USE_WEBVIEW=ON' keyword to the plbwebsrv.ini file.