Re: ScriptInjector async /defer

Thank you for the clarification! 

I wasn't aware of the different handling of "script-inserted" scripts and I must admit I misunderstood the async /defer attributes. I was hoping to get on-demand parsing out of it; control over the point in time the browser starts parsing a previously downloaded script.

The idea is to test if we can get better perceived performance by loading scripts during the apps idle times, but defer parsing and executing it until user interaction necessitates it.

If my assumption is correct, one could more easily balance between startup time and perceived performance on low-bandwidth ,high-latency networks.

On Fri, Sep 13, 2013 at 12:36 PM, Thomas Broyer <t.broyer@gmail.com> wrote:

On Friday, September 13, 2013 11:33:49 AM UTC+2, Oliver Krylow wrote:

Are there any plans to support the 'async' and 'defer' attributes of the 'script' tag in ScriptInjector ?

There's no real reason to support them.

Script-inserted scripts always run async; the only reason to be able to set async (to false) is to enforce execution in insertion order.

As for 'defer', it only affects elements that are "parser inserted", not those inserted by scripts, so it's pointless to set it from GWT.

See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script

That said, I'm not aware of any plan to add support for async.

Also, is it true that since the injected script in ScriptInjector is of type 'text/javascript' , browsers will hold the execution of the UI-Thread until that script is loaded because of a potential 'document.write()'?

No. Script-inserted scripts are always async.

BTW, the type of the script only affects whether the script will run or not, depending on whether or not it's understood by the browser.

 

If so, is the Code Splitting Feature of Gwt also affected by this, since it uses ScriptInjector internally?

N/A 

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