javascript - RequireJS shim config for Underscore -


requirejs provides shim configuration loading traditional/legacy libraries not support amd. shim config allows exporting said library variable.

'backbone' : {             deps : ['underscore', 'jquery'],             exports : 'backbone' }

as shown above, backbone not amd compatible hence shim config used export library variable. can done underscore.

'underscore' : {             exports : '_' }

but if not specify shim config underscore, still works fine. how ? can please shed insight on ?

backbone has dependency of underscore. not necessary dependency has obtained require , other things such shim.
backbone expect _ there in global namespace containing interface underscore library.

when require backbone, app developer provide dependencies using shim option deps property tell dependencies there particular module.

exports property way tell require use property global namespace when referring non amd module, such backbone or _.

so answer question. if not provide shim config underscore following line fail.

var _ = require('underscore');

variable _ in local namespace undefined in case, , backbone using _ global namespace.

to answer doubt. how work in backbone source.

// require underscore, if we're on server, , it's not present.     var _ = root._;     if (!_ && (typeof require !== 'undefined')) _ = require('underscore');

above extract of backbone source requires underscore. evident comments above require server side. root object when in browser refers window. first check "!_" returns false when in browser cause _ available in gloabl object aka window. require doesn't happens in browser(if underscore present).


Comments

Post a Comment

Popular posts from this blog

php - Why I am getting the Error "Commands out of sync; you can't run this command now" -

the documentation of error mentioned in title says if commands out of sync; can't run command now in client code, calling client functions in wrong order. this can happen, example, if using mysql_use_result() , try execute new query before have called mysql_free_result(). can happen if try execute 2 queries return data without calling mysql_use_result() or mysql_store_result() in between. from here: http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html but in first query not fetching data mysql database, inserting. , in second query getting data database. here code $connection = mysqli_connect("localhost","username","password","tbl_msgs"); if(mysqli_connect_errno($connection)) { die("failed connect mysql: " . mysqli_connect_error()); } $query = "insert users (total_comments, total_views) values ({$total_comments}, {$total_views});"; $query .= "insert msgs (no...
Read more

linux - Does gcc have any options to add version info in ELF binary file? -

i mean whether gcc can insert source code version infor elf binary section or similar. not want change source file, add info gcc option in makefile. you can emit version info text file, turn text file object file statically link executable. the first step simple have write code: script or write version info in format plain text file. write makefile rule produce version.o version.txt, using objcopy . you'll have object file 2 useful symbols defined in it: beginning , end of textual version info. add generated object executable, , you'll able access version 2 ways: running strings on binary, or writing code in application print version string (you'll need declare start , end symbols variables in header file).
Read more

java - Are there any classes that implement javax.persistence.Parameter<T>? -

i'm using named queries fetch entities database using jpa , hibernate , came across puzzling me: how come there no default implementations of javax.persistence.parameter interface? i rather impressed how @staticmetamodel used criteriabuilder in jpa2 meaning type safety , don't have mess around setting string names. wanted apply similar of jpa1 ejb's i'm working on: dealergroup_.class: public dealergroup_ { public parameter<integer> id = new parameterimpl<integer>("id"); /// etc... } dealergroupfacade.class: // ... public dealergroup fetch(integer id) { typedquery<dealergroup> query = em.createnamedquery("dealergroup.fetchbyid", dealergroup.class); query.setparameter(dealergroup_.id, query); return query.getsingleresult(); } // ... i surprised find there no implementations of parameter interface - of course, implement myself absence makes me suspicious may mistake using in way? should implementing parameter...
Read more