jquery variable syntax

Question

I m learning jQuery by trying to understand other people s code   I ran into this   jQuery fn myFunc   function options  callback       stuff    jQuery this  settings event  function e        var self   this       self   jQuery  this         body   jQuery   body            etc         more stuff      My understanding is that   refers to the jQuery object   So why put   with  self and  body  And is self the same as  self

User · Answer

This is pure JavaScript   There is nothing special about    It is just a character that may be used in variable names   var     1  var      2  alert            jQuery just assigns it s core function to a variable called    The code you have assigns this to a local variable called self and the results of calling jQuery with this as an argument to a global variable called  self   It s ugly  dirty  confusing  but    self and  self are all different variables that happen to have similar names

User · Answer

No  it certainly is not  It is just another variable name  The     you re talking about is actually the jQuery core function  The  self is just a variable  You can even rename it to foo if you want  this doesn t change things  The    and    are legal characters in a Javascript identifier   Why this is done so is often just some code convention or to avoid clashes with reversed keywords  I often use it for  this as follows   var  this     this

User · Answer

self and  self aren t the same  The former is the object pointed to by  this  and the latter a jQuery object whose  scope  is the object pointed to by  this   Similarly   body isn t the body DOM element but the jQuery object whose scope is the body element

User · Answer

The dollarsign as a prefix in the var name is a usage from the concept of the hungarian notation

User · Answer

self has little to do with    which is an alias for jQuery in this case  Some people prefer to put a dollar sign together with the variable to make a distinction between regular vars and jQuery objects   example   var self    some string   var  self    another string     These are declared as two different variables  It s like putting underscore before private variables   A somewhat popular pattern is   var foo    some string   var  foo       foo      That way  you know  foo is a cached jQuery object later on in the code

[jquery] jquery variable syntax

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