jQuery object equality

Question

How do I determine if two jQuery objects are equal  I would like to be able to search an array for a particular jQuery object     inArray jqobj  my array    -1     alert     deviceTypeRoot          deviceTypeRoot      False alert     deviceTypeRoot           deviceTypeRoot      False

User · Answer

It is  generally speaking  a bad idea to compare   foo  with   foo  as that is functionally equivalent to the following comparison    lt html gt   lt head gt   lt script language  javascript  gt      function foo bar            return     object   bar                    foo       if      a         a               alert   JS engine screw-up              else           alert   Expected result            lt  script gt    lt  head gt   lt  html gt    Of course you would never expect  JS engine screw-up    I use     just to make it clear what jQuery is doing   Whenever you call     foo   you are actually doing a jQuery   foo   which returns a new object  So comparing them and expecting same object is not correct   However what you CAN do may be is something like    lt html gt   lt head gt   lt script language  javascript  gt      function foo bar            return     object   bar                    foo       if      a   object       a   object             alert   Yep  Now it works              else           alert   This should not happen            lt  script gt    lt  head gt   lt  html gt    So really you should perhaps compare the ID elements of the jQuery objects in your real program so something like         someIdSelector  attr  id        someOtherIdSelector  attr  id     is more appropriate

User · Answer

First order your object based on key using this function  function sortObject o        return Object keys o  sort   reduce  r  k    gt   r k    o k   r            Then  compare the stringified version of your object  using this funtion  function isEqualObject a b       return JSON stringify sortObject a      JSON stringify sortObject b           Here is an example   Assuming objects keys are ordered differently and are of the same values  var obj1     hello   hi   world   earth   var obj2     world   earth   hello   hi    isEqualObject obj1 obj2    returns true

User · Answer

If you want to check contents are equal or not then just use  JSON stringify obj   Eg -  var a   key val    var b   key val    JSON stringify a     JSON stringify b  -----  If contents are same you gets true

User · Answer

Use Underscore js isEqual method http   underscorejs org  isEqual

User · Answer

Since jQuery 1 6  you can use  is  Below is the answer from over a year ago     var a       foo    var b   a    if  a is b            the same object        If you want to see if two variables are actually the same object  eg   var a       foo    var b   a       then you can check their unique IDs  Every time you create a new jQuery object it gets an id   if    data a       data b            the same object      Though  the same could be achieved with a simple a     b  the above might at least show the next developer exactly what you re testing for   In any case  that s probably not what you re after  If you wanted to check if two different jQuery objects contain the same set of elements  the you could use this     fn equals   function compareTo      if   compareTo    this length    compareTo length        return false        for  var i   0  i  lt  this length    i        if  this i      compareTo i           return false              return true       Source  var a      p    var b      p    if  a equals b            same set

User · Answer

If you still don t know  you can get back the original object by   alert     deviceTypeRoot   0         deviceTypeRoot   0      True alert     deviceTypeRoot   0          deviceTypeRoot   0     True   because     deviceTypeRoot   also returns an array of objects which the selector has selected

User · Answer

The   fn equals      solution is probably the cleanest and most elegant one   I have tried something quick and dirty like this   JSON stringify a     JSON stringify b    It is probably expensive  but the comfortable thing is that it is implicitly recursive  while the elegant solution is not   Just my 2 cents

[equality] jQuery object equality

Examples related to equality

Examples related to jquery