Input jQuery get old value before onchange and get value after on change

Question

I have an input text in jQuery I want to know if it possible to get the value of that input text type number and type text  before the onchange happens and also get the value of the same input input text after the onchange happens  This is using jQuery   What I tried   I tried saving the value on variable then call that value inside onchange but I am getting a blank value

User · Answer

Definitely you will need to store old value manually, depending on what moment you are interested (before focusing, from last change). Initial value can be taken from defaultValue property:

function onChange() {
    var oldValue = this.defaultValue;
    var newValue = this.value;
}

Value before focusing can be taken as shown in Gone Coding's answer. But you have to keep in mind that value can be changed without focusing.

User · Answer

my solution is here    function getVal         var  numInput       input        var  inputArr           for let i 0  i  lt   numInput length   i              inputArr  numInput i  name     numInput i  value      return  inputArr    var  inNum    getVal       input   on  change   function            inNum is last Val      inNum    getVal            in here we update value of input     let  val   this value

User · Answer

My business aim was removing classes form previous input and add it to a new one  In this case there was simple solution  remove classes from all inputs before add  lt div gt      lt input type  quot radio quot  checked gt  lt b class  quot darkred quot  gt Value1 lt  b gt      lt input type  quot radio quot  gt  lt b gt Value2 lt  b gt      lt input type  quot radio quot  gt  lt b gt Value3 lt  b gt   lt  div gt   and    input type  quot radio quot     on  change   function         var current     this      current closest  div   find  input   each function              this  next   removeClass  darkred             current next   addClass  darkred         JsFiddle  http   jsfiddle net gkislin13 tybp8skL

User · Answer

The upvoted solution works for some situations but is not the ideal solution  The solution Bhojendra Rauniyar provided will only work in certain scenarios  The var inputVal will always remain the same  so changing the input multiple times would break the function   The function may also break when using focus  because of the     up down  spinner on html number input  That is why J T  Taylor has the best solution  By adding a data attribute you can avoid these problems    lt input id  my-textbox  type  text  data-initial-value  6  value  6    gt

User · Answer

I have found a solution that works even with  Select2  plugin   function functionName          html   on  change    select some-class   function         var newValue     this  val        var oldValue     this  attr  data-val        if     isNumeric oldValue         or another condition          do something             this  attr  data-val   newValue              select some-class   trigger  change

User · Answer

The simplest way is to save the original value using data   when the element gets focus  Here is a really basic example   JSFiddle  http   jsfiddle net TrueBlueAussie e4ovx435      input   on  focusin   function        console log  Saving value       this  val           this  data  val     this  val             input   on  change   function        var prev     this  data  val        var current     this  val        console log  Prev value     prev       console log  New value     current         Better to use Delegated Event Handlers  Note  it is generally more efficient to use a delegated event handler when there can be multiple matching elements  This way only a single handler is added  smaller overhead and faster initialisation  and any speed difference at event time is negligible   Here is the same example using delegated events connected to document     document  on  focusin    input   function        console log  Saving value       this  val           this  data  val     this  val        on  change   input   function        var prev     this  data  val        var current     this  val        console log  Prev value     prev       console log  New value     current         JsFiddle  http   jsfiddle net TrueBlueAussie e4ovx435 65   Delegated events work by listening for an event  focusin  change etc  on an ancestor element  document  in this case   then applying the jQuery filter  input  to only the elements in the bubble chain then applying the function to only those matching elements that caused the event    Note  A a general rule  use document as the default for delegated events and not body  body has a bug  to do with styling  that can cause it to not get bubbled mouse events  Also document always exists so you can attach to it outside of a DOM ready handler

User · Answer

I found this question today  but I m not sure why was this made so complicated rather than implementing it simply like   var input       target    var inputVal   input val    input on  change   function       console log  Current Value       this  val       console log  Old Value     inputVal     inputVal     this  val          If you want to target multiple inputs then  use each function      input   each function       var inputVal     this  val        this  on  change   function         console log  Current Value      this  val         console log  Old Value     inputVal       inputVal     this  val

User · Answer

If you only need a current value and above options don t work  you can use it this way       input   on  change        gt      const current   document getElementById  input   value

User · Answer

Just put the initial value into a data attribute when you create the textbox  eg  HTML   lt input id  my-textbox  type  text  data-initial-value  6  value  6    gt     JQuery      my-textbox   change function       var oldValue     this  attr  data-initial-value     var newValue     this  val

[javascript] Input jQuery get old value before onchange and get value after on change

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