Best way to track onchange as-you-type in input type text

Question

In my experience  input type  text  onchange event usually occurs only after you leave  blur  the control   Is there a way to force browser to trigger onchange every time textfield content changes  If not  what is the most elegant way to track this    manually      Using onkey  events is not reliable  since you can right-click the field and choose Paste  and this will change the field without any keyboard input   Is setTimeout the only way    Ugly  -

User · Answer

Method 1  Add an event listener for input   element addEventListener  input   myFunction      nbsp   Method 2  Define the oninput property with JavaScript   element oninput   function         myFunction          nbsp   Method 3  Define the oninput property with HTML    lt input type  text  oninput  myFunction     gt

User · Answer

If you use ONLY Internet Explorer  you can use this    lt input type  text  id  myID  onpropertychange  TextChange this     gt    lt script type  text javascript  gt      function TextChange tBox            if event propertyName   value                   your code here                  lt  script gt    Hope that helps

User · Answer

Please  judge next approach using JQuery   HTML    lt input type  text  id  inputId    gt    Javascript JQuery        inputId   keyup function                inputId   blur                inputId   focus             inputId   change function              do whatever you need to do on actual change of the value of the input field

User · Answer

input  worked for me    var searchBar    document getElementById  searchBar    searchBar addEventListener  input   PredictSearch  false

User · Answer

These days listen for oninput   It feels like onchange without the need to lose focus on the element  It is HTML5   It   s supported by everyone  even mobile   except IE8 and below  For IE add onpropertychange  I use it like this    x000D   x000D  const source   document getElementById  source    x000D  const result   document getElementById  result    x000D   x000D  const inputHandler   function e    x000D    result innerHTML   e target value  x000D    x000D   x000D  source addEventListener  input   inputHandler   x000D  source addEventListener  propertychange   inputHandler      for IE8 x000D     Firefox Edge18- IE9  don   t fire on  lt select gt  lt option gt  x000D     source addEventListener  change   inputHandler    x000D   lt input id  source  gt  x000D   lt div id  result  gt  lt  div gt  x000D   x000D   x000D

User · Answer

Use oninput instead of onchange  index html  lt html gt     lt head gt       lt title gt title here lt  title gt       lt script src  quot index js quot  gt  lt  script gt     lt  head gt     lt body gt       lt input oninput  quot onclickhandler this  quot  gt  lt  input gt     lt  body gt   lt  html gt   script js function onclickhandler e      console log e value

User · Answer

I had a similar requirement  twitter style text field   Used onkeyup and onchange  onchange actually takes care of mouse paste operations during lost focus from the field    Update  In HTML5 or later  use oninput to get real time character modification updates  as explained in other answers above

User · Answer

You could use the keydown  keyup and keypress events as well

User · Answer

onkeyup happens after you type for example I press t when I lift the finger the action happens but on keydown the action happens before I digit the character t  Hope this is helpful for someone    So onkeyup is better for when you want to send what you just typed now

User · Answer

To track each try this example and before that completely reduce cursor blink rate to zero    x000D   x000D   lt body gt  x000D    try onkeydown onkeyup onkeypress x000D   lt input type  text  onkeypress  myFunction this value   gt  x000D   lt span gt   lt  span gt  x000D   lt script gt  x000D  function myFunction val    x000D    alert val   x000D  var mySpan   document getElementsByTagName  span   0  innerHTML  x000D  mySpan    val   lt br gt    x000D  document getElementsByTagName  span   0  innerHTML   mySpan  x000D    x000D   lt  script gt  x000D   x000D   lt  body gt  x000D   x000D   x000D    onblur   event generates on exit  onchange   event generates on exit if any changes made in inputtext  onkeydown  event generates on any key press  for key holding long times also   onkeyup    event generates on any key release  onkeypress  same as onkeydown  or onkeyup  but won t react for ctrl backsace alt other

User · Answer

Javascript is unpredictable and funny here    onchange occurs only when you blur the textbox onkeyup  amp  onkeypress doesn t always occur on text change onkeydown occurs on text change  but cannot track cut  amp  paste with mouse click  onpaste  amp  oncut occurs with keypress and even with the mouse right click    So  to track the change in textbox  we need onkeydown  oncut and onpaste  In the callback of these event  if you check the value of the textbox then you don t get the updated value as the value is changed after the callback  So a solution for this is to set a timeout function with a timeout of 50 mili-seconds  or may be less   to track the change   This is a dirty hack but this is the only way  as I researched   Here is an example  http   jsfiddle net 2BfGC 12

User · Answer

Below code works fine for me with Jquery 1 8 3  HTML    lt input type  text  id  myId    gt   Javascript JQuery       myId   on  change keydown paste input   function          doSomething

User · Answer

I think in 2018 it s better to use the input event   -  As the WHATWG Spec describes  https   html spec whatwg org multipage indices html event-input-input       Fired at controls when the user changes the value  see also   the change event    -  Here s an example of how to use it    lt input type  text  oninput  handleValueChange    gt

User · Answer

there is a quite near solution  do not fix all Paste ways  but most of them   It works for inputs as well as for textareas    lt input type  text       gt   lt textarea      gt     lt  textarea gt    Do like this    lt input type  text      onkeyup  JavaScript  ControlChanges    onmouseup  JavaScript  ControlChanges     gt   lt textarea     onkeyup  JavaScript  ControlChanges    onmouseup  JavaScript  ControlChanges     gt     lt  textarea gt    As i said  not all ways to Paste fire an event on all browsers    worst some do not fire any event at all  but Timers are horrible to be used for such   But most of Paste ways are done with keyboard and or mouse  so normally an onkeyup or onmouseup are fired after a paste  also onkeyup is fired when typing on keyboard   Ensure yor check code does not take much time    otherwise user get a poor impresion   Yes  the trick is to fire on key and on mouse    but beware both can be fired  so take in mind such

User · Answer

Robert Siemer  addEventListener is not supported in IE8     Older versions of IE supported an equivalent  proprietary EventTarget attachEvent   method   https   developer mozilla org it docs Web API Element addEventListener

User · Answer

Update   See Another answer  2015      Original 2009 Answer   So  you want the onchange event to fire on keydown  blur  and paste  That s magic   If you want to track changes as they type  use  onkeydown   If you need to trap paste operations with the mouse  use  onpaste   IE  FF3  and  oninput   FF  Opera  Chrome  Safari1    1Broken for  lt textarea gt  on Safari  Use textInput instead

User · Answer

2018 here  this is what I do     inputs  on  change keydown paste input propertychange click keyup blur  handler     If you can point out flaws in this approach  I would be grateful

[javascript] Best way to track onchange as-you-type in input type="text"?

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