DataLab HTML outputs should execute any contained script elements

[drewbryant]

In order to support the DataLab charting extensions, it's necessary that HTML cell outputs with embedded script elements are executed.

For IPython, this is done automatically by JQuery whenever the HTML output content is written to the output DOM element.

[drewbryant]

Apparently the Angular team's recommendation for getting <script> tag execution within HTML snippets is "use JQuery".

Looks like there are some lighter weight alternatives though to explore: http://stackoverflow.com/a/25431736

[nikhilk]

If we're guaranteed the browser doesn't execute the script, then potentially we could insert the HTML into the DOM via innerHTML, and then walk the DOM to find the script elements and execute them, rather than doing all that parsing and handling HTML pre/post script separately as outlined in the link.

[drewbryant]

Seems like it could work. When I inspect the HTML being injected by the charting library within the cell output, just grabbing the script tag verbatim and evaluating it does cause the expected chart to be rendered.

Some details around innerHTML and script tag handling here: http://stackoverflow.com/a/13392818

[nikhilk]

I think that page might be getting at it, but its probably a good idea to use a document fragment (document.createDocumentFragment) to do the initial parsing and walking over the DOM to pull out content and script elements to insert into the output cell within the primary DOM.

[drewbryant]

Ok, will look into this approach