jquery class each how many items

Question

When looping over a group of items using jquery selectors is there a way to find out how many items there are on the collection

User · Answer

You mean like length or size     Refs  http   api jquery com length

User · Answer

If you are using a version of jQuery that is less than version 1 8 you can use the      class   size   which takes zero parameters  See documentation for more information on  size   method   However if you are using  or plan to upgrade  to 1 8 or greater you can use     class   length property  See documentation for more information on  length property

User · Answer

If you re using chained syntax       class   each function                         I don t think there s any  reasonable  way for the code within the each function to know how many items there are   Unreasonable ways would involve repeating the selector and using index    But it s easy enough to make the collection available to the function that you re calling in each  Here s one way to do that   var collection       class    collection each function            You can access  collection length  here        As a somewhat convoluted option  you could convert your jQuery object to an array and then use the array s forEach  The arguments that get passed to forEach s callback are the entry being visited  what jQuery gives you as this and as the second argument   the index of that entry  and the array you called it on       class   get   forEach function entry  index  array           Here  array length is the total number of items       That assumes an at least vaguely modern JavaScript engine and or a shim for Array forEach   Or for that matter  give yourself a new tool      Loop through the jQuery set calling the callback        loop callback  thisArg      Callback gets called with  this  set to  thisArg  unless  thisArg     is falsey  in which case  this  will be the element being visited     Arguments to callback are  element    index   and  set   where     element  is the element being visited   index  is its index in the    set  and  set  is the jQuery set  loop  was called on     Callback s return value is ignored unless it s      false   in which case    it stops the loop    fn loop   function callback  thisArg        var me   this      return this each function index  element            return callback call thisArg    element  element  index  me                Usage       class   loop function element  index  set           Here  set length is the length of the set

User · Answer

Use the  length property  It is not a function   alert     class   length      alerts a nonnegative number

[jquery] jquery $('.class').each() how many items?

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