how to compare two elements in jquery

Question

var a     start  gt  div last-child    var b     start  gt  div live   0   alert a  b  alert a    b     It s always false  How can you compare two elements in jQuery   thanks

User · Answer

For the record  jQuery has an is   function for this   a is b    Note that a is already a jQuery instance

User · Answer

Every time you call the jQuery   function  a new object is created and returned  So even equality checks on the same selectors will fail    lt div id  a  gt test lt  div gt       a          a      false   The resulting jQuery object contains an array of matching elements  which are basically native DOM objects like HTMLDivElement that always refer to the same object  so you should check those for equality using the array index as Darin suggested       a   0         a   0     true

User · Answer

The collection results you get back from a jQuery collection do not support set-based comparison   You can use compare the individual members one by one though  there are no utilities for this that I know of in jQuery

User · Answer

You could compare DOM elements  Remember that jQuery selectors return arrays which will never be equal in the sense of reference equality   Assuming    lt div id  a  class  a  gt  lt  div gt    this      div a   0        div a   0    returns true

User · Answer

Random AirCoded example of testing  set equality  in jQuery     fn isEqual   function  otherSet      if  this      otherSet  return true    if  this length     otherSet length  return false    var ret   true    this each function idx         if  this      otherSet idx            ret   false  return false                return ret      var a     start  gt  div last-child    var b     start  gt  div live   0    console log   b  isEqual a

User · Answer

a is b    and to check if they are not equal use    a is b    as for   b       a            a   0      b 0     not always true   maybe class added to the element or removed from it after the first assignment

[javascript] how to compare two elements in jquery

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