document ready shorthand

Question

Is the following shorthand for   document  ready    function        some code     jQuery     I see this pattern used a lot  but I m unable to find any reference to it  If it is shorthand for   document  ready    is there any particular reason it might not work  In my tests it seems to always fire before the ready event

User · Accepted Answer

The shorthand for   document  ready handler  is   handler   where handler is a function   See here   The code in your question has nothing to do with  ready    Rather  it is an immediately-invoked function expression  IIFE  with the jQuery object as its argument  Its purpose is to restrict the scope of at least the   variable to its own block so it doesn t cause conflicts  You typically see the pattern used by jQuery plugins to ensure that      jQuery

User · Answer

This is not a shorthand for   document  ready     The code you posted boxes the inside code and makes jQuery available as   without polluting the global namespace  This can be used when you want to use both prototype and jQuery on one page   Documented here  http   learn jquery com using-jquery-core avoid-conflicts-other-libraries  use-an-immediately-invoked-function-expression

User · Answer

The correct shorthand is this     function            this behaves as if within document ready         The code you posted      function        some code     jQuery        creates an anonymous function and executes it immediately with jQuery being passed in as the arg    All it effectively does is take the code inside the function and execute it like normal  since   is already an alias for jQuery   D

User · Answer

Even shorter variant is to use        gt          where   stands for jQuery and     gt    is so called  arrow function  that inherits this from the closure   So that in this you ll probably have window instead of document

User · Answer

The shorthand is     function            Code here

User · Answer

What about this    function            function             more code using   as alias to jQuery         will be fired when document is ready           jQuery

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These specific lines are the usual wrapper for jQuery plugins       to make sure that your plugin doesn t collide with other libraries that might use the dollar sign  it s a best practice to pass jQuery to a self executing function  closure  that maps it to the dollar sign so it can t be overwritten by another library in the scope of its execution     function           fn myPlugin   function            Do your awesome plugin stuff here          jQuery      From http   docs jquery com Plugins Authoring

User · Answer

The multi-framework safe shorthand for ready is   jQuery function    undefined             is guaranteed to be short for jQuery in this scope        undefined is provided because it could have been overwritten elsewhere       This is because jQuery isn t the only framework that uses the   and undefined variables

[javascript] $(document).ready shorthand

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