[Mapbender-dev] JavaScript compression

[Christoph Baudson (WhereGroup)]

thanks for your suggestion, Marc.

I have checked the tool and the compression rates are better than JSMin's.

While JSMin compressed my sample file (map.js, around 60K) to 70%, 
Shrinksafe made it to around 60%. I think I will try to compress the 
relevant files with both and want to see if there is a difference. If 
not, then Shrinksafe is definitely a good choice.

I have also found a nice online interface at

http://alex.dojotoolkit.org/shrinksafe/

The next step would be to find an easy way of compressing all the 
relevant files in one go, preferably via Eclipse's "Export", as Uli 
suggested. How do we proceed? I have created a ticket at

http://trac.osgeo.org/mapbender/ticket/54

Christoph

Marc Jansen schrieb:
> Hi list,
> 
> I would love to see compression brought to the Javascript files and have 
> another suggestion as for the compression tool:
> 
> http://dojotoolkit.org/docs/shrinksafe (a nice article which shows how 
> to use the compression tool)
> 
> The Java-file custom_rhino.jar is used to pack Javascript. This is used 
> within the dojotoolkit (www.dojotoolkit.org) for example. One can 
> download the file here: 
> http://svn.dojotoolkit.org/dojo/trunk/buildscripts/lib/custom_rhino.jar
> 
> -- Marc
> 
> 
> 
> Christoph Baudson (WhereGroup) schrieb:
>> To enable Mapbender to load faster, the new release will employ 
>> JavaScript compression.
>>
>> There has been a lot of discussion about this in the past; I think 
>> packing the JS files with JSMin is the best idea:
>>
>> http://www.crockford.com/javascript/jsmin.html
>>
>> + the existing JS code must not stick to a given syntax
>> + transparent (removes only linefeeds, whitespaces and comments)
>> + no obfuscation
>> 0 compared to real packers with still a good compression rate.
>>
>> Files that are already compressed with other packers (like jQuery) 
>> will of course not be re-compressed.
>>
>> Some more questions arise:
>>
>> 1) Where to store the compressed/uncompressed files in the file 
>> system. The default setting should be "compressed" IMHO. It should be 
>> easy to switch back and forth from uncompressed to compressed.
>>
>> 2) Which settings? Take a look at
>>
>> http://fmarcia.info/jsmin/test.html
>>
>> You can add comments. The compressed JS files will not have a license 
>> on top of the script, as comments are removed. Do we have to add a 
>> license?
>>
>> For compression settings, I chose "conservative" for my test run; Some 
>> scripts like jsTree.js don't use the ; to end statements, so a 
>> linefeed mustn't be removed.
>>
>> Any ideas?
>>
>> Christoph
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