jQuery what is the best way to restrict number -only input for textboxes allow decimal points

Question

What is the best way to restrict  number -only input for textboxes   I am looking for something that allows decimal points   I see a lot of examples  But have yet to decide which one to use   Update from Praveen Jeganathan  No more plugins  jQuery has implemented its own jQuery isNumeric   added in v1 7  See  https   stackoverflow com a 20186188 66767

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If you re using HTML5 you don t need to go to any great lengths to perform validation  Just use -    lt input type  number  step  any    gt    The step attribute allows the decimal point to be valid

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I thought that the best answer was the one above to just do this   jQuery   numbersOnly   keyup function            this value   this value replace    0-9    g             but I agree that it is a bit of a pain that the arrow keys and delete button snap cursor to the end of the string   and because of that it was kicked back to me in testing   I added in a simple change      numbersOnly   keyup function          if  this value    this value replace    0-9    g                this value   this value replace    0-9    g                   this way if there is any button hit that is not going to cause the text to be changed just ignore it   With this you can hit arrows and delete without jumping to the end but it clears out any non numeric text

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I have this piece of code that does the job very well for me    var prevVal           numericValue   on  input   function  evt        var self     this       if  self val   match   -  d        d   d           null            prevVal   self val         else           self val prevVal             if   evt which    46    self val   indexOf         -1   amp  amp   evt which  lt  48    evt which  gt  57   amp  amp   evt which    45  amp  amp  self val   indexOf  -      0             evt preventDefault

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window jQuery fn ForceNumericOnly          function                  return this each function                       this  keydown function  event                          Allow  backspace  delete  tab  escape  and enter                    if  event keyCode    46    event keyCode    8    event keyCode    9    event keyCode    27    event keyCode    13                              Allow  Ctrl A                         event keyCode    65  amp  amp  event ctrlKey     true                               Allow  home  end  left  right                         event keyCode  gt   35  amp  amp  event keyCode  lt   39                               let it happen  don t do anything                        return                       else                             Ensure that it is a number and stop the keypress                        if  event shiftKey     event keyCode  lt  48    event keyCode  gt  57   amp  amp   event keyCode  lt  96    event keyCode  gt  105                                event preventDefault                                                                                                And apply this on all the inputs you want      selector   ForceNumericOnly

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I used James Nelli answer and added onpaste  return false    H  vard Geithus  to ensure only integer is entered into the input  Even if you tried to paste  it will not allow it

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I used this with good results    ini     id   val    a 0      id   keyup function e       var charcode    e which    e which   e keyCode         for decimal point     if   charcode   190    charcode   110                      for numeric keys andcontrol keys         if     charcode gt  33  amp  amp  charcode lt  57                 for numpad numeric keys          charcode gt  96  amp  amp  charcode lt  105              for backspace            charcode  8                          alert  Sorry  Only numeric values allowed                     id   val ini                        to include decimal point if first one has been deleted          if charcode   8                        ini ini split     reverse                if ini 0                    a 0                                       else               if a  1                        alert  Sorry  Second decimal point not allowed                     id   val ini                     a 1            ini     id   val          find keycodes at http   www cambiaresearch com articles 15 javascript-char-codes-key-codes

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Please add in the bottom of the script   if this value length    1  amp  amp  this value    0   this value

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Found a great solution here http   ajax911 com numbers-numeric-field-jquery   I just changed the  keyup  to  keydown  as per my requirement

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You can use HTML5 validation on your text inputs by adding a pattern  No need to manually validate with regex or keyCodes    lt input type  text  pattern   0-9       gt      input type text  pattern    on  input   function          if   this checkValidity            this value   this value slice 0  -1         For a solution with input  type number   see my full answer here

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numeric   keypress function event         Backspace  tab  enter  end  home  left  right      We don t support the del key in Opera because del         46    var controlKeys    8  9  13  35  36  37  39        IE doesn t support indexOf   var isControlKey   controlKeys join      match new RegExp event which         Some browsers just don t raise events for control keys  Easy       e g  Safari backspace    if   event which       Control keys in most browsers  e g  Firefox tab is 0        49  lt   event which  amp  amp  event which  lt   57        Always 1 through 9        48    event which  amp  amp    this  attr  value          No 0 first digit       isControlKey       Opera assigns values for control keys      return      else       event preventDefault              This code worked pretty good on me  I just had to add the 46 in the controlKeys array to use the period  though I don t thinks is the best way to do it

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The numeric   plugin mentioned above  doesn t work in Opera  you can t backspace  delete or even use the back or forward keys    The code below in both JQuery or Javascript will work perfectly  and it s only two lines    JQuery     document  ready function             key-numeric   keypress function e                var verified    e which    8    e which    undefined    e which    0    null   String fromCharCode e which  match    0-9                 if  verified   e preventDefault                   Javascript   function isNumeric e        var keynum     window event    e which   e keyCode      return    keynum    8    keynum    undefined    e which    0    null   String fromCharCode keynum  match    0-9          Of course this is for pure numeric input  plus backspace  delete  forward back keys  only but can easily be changed to include points and minus characters

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I think this is a good way of solving this problem and it s extremely simple     function         var pastValue  pastSelectionStart  pastSelectionEnd          input   on  keydown   function             pastValue            this value          pastSelectionStart   this selectionStart          pastSelectionEnd     this selectionEnd         on  input propertychange   function             var regex      0-9      0-9               if  this value length  gt  0  amp  amp   regex test this value                 this value            pastValue              this selectionStart   pastSelectionStart              this selectionEnd     pastSelectionEnd                          Example  JSFiddle  Scenarios covered  Most similar recommendations here fail at least one of these or require a lot of code to cover all these scenarios    Only allows 1 decimal point  Allows home  end  and the arrow keys  Allows delete and backspace to be used at any index  Allows editing at any index  as long as the input matches the regex   Allows ctrl v and shift insert for valid input  same with right click   paste   Doesn t flicker the text value because the keyup event is not used  Restores the selection after invalid input    Scenarios failed   Starting with 0 5 and deleting only the zero will not work  This can be fixed by changing the regex to    0-9      0-9     and then adding a blur event to prepend a 0 when the textbox starts with a decimal point  if desired   See this advanced scenario  for a better idea of how to fix this    Plugin  I created this simple jquery plugin to make this easier      input   limitRegex    0-9      0-9

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You dont see alphabets magical appearance and disappearance on key down  This works on mouse paste too        txtInt   bind  input propertychange   function            this  val   this  val   replace    0-9  g

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this is my cross browser version of  How to allow only numeric  0-9  in HTML  inputbox using jQuery          inputPrice   keydown function e       var keyPressed      if   e  var e   window event      if  e keyCode  keyPressed   e keyCode      else if  e which  keyPressed   e which      var hasDecimalPoint       this  val   split      length-1  gt 0       if   keyPressed    46    keyPressed    8     keyPressed    190  keyPressed    110  amp  amp   hasDecimalPoint  amp  amp   e shiftKey      keyPressed    9    keyPressed    27    keyPressed    13                    Allow  Ctrl A              keyPressed    65  amp  amp  e ctrlKey     true                     Allow  home  end  left  right              keyPressed  gt   35  amp  amp  keyPressed  lt   39                         let it happen  don t do anything                  return                    else                  Ensure that it is a number and stop the keypress             if  e shiftKey     keyPressed  lt  48    keyPressed  gt  57   amp  amp   keyPressed  lt  96    keyPressed  gt  105                      e preventDefault

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There s a nice jquery plugin called  Jquery Mask Plugin that designed to make masks on form fields and html elements  but you can also used it to simply define what kind of data could be typed inside of a field        numeric-input   mask  0       Now only numbers will be allowed inside your form field

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The jquery numeric plugin works well for me too   The only thing I dislike has to do with intuitiveness  Keypresses get  disallowed  without any feedback to the user  who might get paranoid or wonder whether his keyboard is broken   I added a second callback to the plugin to make simple feedback on blocked input possible       someInput   numeric      null     default config     null     no validation onblur callback     function               for every blocked keypress            this  effect  pulsate     times 2    100              Just an example  using jQuery UI   of course  Any simple visual feedback would help

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Check this find code for Database use   function numonly root        gt  gt var reet   root value      var arr1   reet length      var ruut   reet charAt arr1-1        gt  gt  gt if  reet length  gt  0           var regex     0-9               if   ruut match regex                var reet   reet slice 0  -1                 root  val reet            gt  gt  gt  gt             Then use the even handler onkeyup  numonly this

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This is a snippet I ve just done  using a part of code by Peter Mortensen   Keith Bentrup  for an integer percent validation on a textfield  jQuery is required       This validates that the value of the text box corresponds    to a percentage expressed as an integer between 1 and 100     otherwise adjust the text box value for this condition is met         id   percent textfield     keyup function e       if   isNaN parseInt this value 10              this value   parseInt this value         else           this value   0            this value   this value replace    0-9  g           if  parseInt this value 10   gt  100            this value   100          return              This code    Allows to use main numeric keys and numeric keypad  Validates to exclude Shift-numeric chars  e g           etc  Replaces NaN values by 0 Replaces by 100 values higher than 100   I hope this helps those in need

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You can use autoNumeric from decorplanit com   They have a nice support for numeric  as well as currency  rounding  etc   I have used in an IE6 environment  with few css tweaks  and it was a reasonable success   For example  a css class numericInput could be defined  and it could be used to decorate your fields with the numeric input masks   adapted from autoNumeric website      input numericInput   autoNumeric  aSep       aDec            very flexible

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I first tried solving this using jQuery  but I wasn t happy about unwanted characters  non-digits  actually appearing in the input field just before being removed on keyup    Looking for other solutions I found this   Integers  non-negative    lt script gt    function numbersOnly oToCheckField  oKeyEvent        return oKeyEvent charCode     0              d  test String fromCharCode oKeyEvent charCode         lt  script gt    lt form name  myForm  gt   lt p gt Enter numbers only   lt input type  text  name  myInput       onkeypress  return numbersOnly this  event         onpaste  return false     gt  lt  p gt   lt  form gt    Source  https   developer mozilla org en-US docs Web API GlobalEventHandlers onkeypress Example Live example  http   jsfiddle net u8sZq   Decimal points  non-negative   To allow a single decimal point you could do something like this    lt script gt    function numbersOnly oToCheckField  oKeyEvent                var s   String fromCharCode oKeyEvent charCode       var containsDecimalPoint        test oToCheckField value       return oKeyEvent charCode     0      d  test s                   test s   amp  amp   containsDecimalPoint       lt  script gt    Source  Just wrote this  Seems to be working  Live example  http   jsfiddle net tjBsF   Other customizations   To allow more symbols to be typed just add those to the regular expression that is acting as the basic char code filter   To implement simple contextual restrictions  look at the current content  state  of the input field  oToCheckField value    Some things you could be interested in doing    Only one decimal point allowed Allow minus sign only if positioned at the start of the string  This would allow for negative numbers    Shortcomings   The caret position is not available inside the function  This greatly reduced the contextual restrictions you can implement  e g  no two equal consecutive symbols   Not sure what the best way to access it is     I know the title asks for jQuery solutions  but hopefully someone will find this useful anyway

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Using Keypress Event        Array Method      var asciiCodeOfNumbers    48  49  50  51  52  53  54  54  55  56  57      numbersOnly   keypress function  e            if    inArray e which  asciiCodeOfNumbers     -1              e preventDefault                    Direct Method          numbersOnly   keypress function  e            if  e which  lt  48    57  lt  e which              e preventDefault

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Just run the contents through parseFloat    It will return NaN on invalid input

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No more plugins  jQuery has implemented its own jQuery isNumeric   added in v1 7   jQuery isNumeric  value   Determines whether its argument is anumber   Samples results   isNumeric   quot -10 quot            true   isNumeric  16              true   isNumeric  0xFF            true   isNumeric   quot 0xFF quot           true   isNumeric   quot 8e5 quot            true  exponential notation string    isNumeric  3 1415          true   isNumeric   10             true   isNumeric  0144            true  octal integer literal    isNumeric   quot  quot               false   isNumeric                  false  empty object    isNumeric  NaN             false   isNumeric  null            false   isNumeric  true            false   isNumeric  Infinity        false   isNumeric  undefined       false  Here is an example of how to tie the isNumeric   in with the event listener   document  on  keyup     numeric-only   function event       var v   this value     if   isNumeric v      false              chop off the last char entered         this value   this value slice 0 -1

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If you want to restrict input  as opposed to validation   you could work with the key events  something like this    lt input type  text  class  numbersOnly  value      gt    And   jQuery   numbersOnly   keyup function           this value   this value replace    0-9    g            This immediately lets the user know that they can t enter alpha characters  etc  rather than later during the validation phase    You ll still want to validate because the input might be filled in by cutting and pasting with the mouse or possibly by a form autocompleter that may not trigger the key events

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I just found an even better plug-in  Gives you much more control  Say you have a DOB field where you need it be numeric but also accepts     or  -  characters   It works great   Check it out at http   itgroup com ph alphanumeric

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Below is what I use to literally block the keystrokes  This only allows numbers 0-9 and a decimal point  Easy to implement  not a lot of code  and works like a charm    lt script gt  function isNumberKey evt        var charCode    evt which    evt which   event keyCode      if  charCode    46  amp  amp  charCode  gt  31  amp  amp   charCode  lt  48    charCode  gt  57             return false        else           return true                 lt  script gt    lt input value    onkeypress  return isNumberKey event   gt

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No need for the long code for number input restriction just try this code       It also accepts valid int  amp  float both values    Javascript Approach   x000D   x000D  onload  function     x000D    var ele   document querySelectorAll   number-only   0   x000D    ele onkeypress   function e    x000D       if isNaN this value    String fromCharCode e charCode    x000D          return false  x000D      x000D    ele onpaste   function e   x000D       e preventDefault    x000D      x000D    x000D   lt p gt  Input box that accepts only valid int and float values  lt  p gt  x000D   lt input class  number-only  type text   gt  x000D   x000D   x000D    jQuery Approach   x000D   x000D    function    x000D   x000D        number-only   keypress function e    x000D   if isNaN this value    String fromCharCode e charCode    return false  x000D       x000D     on  cut copy paste  function e   x000D   e preventDefault    x000D        x000D   x000D      x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   lt p gt  Input box that accepts only valid int and float values  lt  p gt  x000D   lt input class  number-only  type text   gt  x000D   x000D   x000D    UPDATE  The above answers are for most common use case - validating input as a number      But below is the code snippet for special use cases    Allowing negative numbers Showing the invalid keystroke before removing it     x000D   x000D    function    x000D         x000D        number-only   keyup function e    x000D          if this value   -   x000D            while isNaN this value   x000D              this value   this value split     reverse   join     replace    D  i     x000D                                      split     reverse   join      x000D         x000D       on  cut copy paste  function e   x000D       e preventDefault    x000D          x000D   x000D      x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   lt p gt  Input box that accepts only valid int and float values  lt  p gt  x000D   lt input class  number-only  type text   gt  x000D   x000D   x000D

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The jquery numeric plugin has some bugs that I notified the author of  It allows multiple decimal points in Safari and Opera  and you can t type backspace  arrow keys  or several other control characters in Opera  I needed positive integer input so I ended up just writing my own in the end       numeric   keypress function event         Backspace  tab  enter  end  home  left  right      We don t support the del key in Opera because del         46    var controlKeys    8  9  13  35  36  37  39        IE doesn t support indexOf   var isControlKey   controlKeys join      match new RegExp event which         Some browsers just don t raise events for control keys  Easy       e g  Safari backspace    if   event which       Control keys in most browsers  e g  Firefox tab is 0        49  lt   event which  amp  amp  event which  lt   57        Always 1 through 9        48    event which  amp  amp    this  attr  value          No 0 first digit       isControlKey       Opera assigns values for control keys      return      else       event preventDefault

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Other way to keep the caret position on the input     document  ready function           numbersOnly   on  input   function         var position   this selectionStart - 1       fixed   this value replace    0-9    g          remove all but number and       if fixed charAt 0                              can t start with         fixed   fixed slice 1        var pos   fixed indexOf        1      if pos  gt   0        fixed   fixed substr 0 pos    fixed slice pos  replace              avoid more than one        if  this value     fixed          this value   fixed        this selectionStart   position        this selectionEnd   position                    Advantages    The user can use the arrow keys  Backspace  Delete       Works when you want to paste numbers   Plunker  Demo working

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ALLOWS NEGATIVE NUMBERS ALSO  Following code also accepts negative numbers  HTML   lt input type  text  name  myText    gt    JS  var pastValue  pastSelectionStart  pastSelectionEnd      input   on  keydown   function         pastValue            this value      pastSelectionStart   this selectionStart      pastSelectionEnd     this selectionEnd     on  input propertychange   function          if   this value length  gt  0  amp  amp    isNumeric this value     false  amp  amp  this value     -              this value            pastValue          this selectionStart   pastSelectionStart          this selectionEnd     pastSelectionEnd           on  blur   function            if this value     -               this value

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This function does the same thing  uses some of the ideas above    field keyup function        var val    j this  val        if isNaN val             val   val replace    0-9    g               if val split      length gt 2  val  val replace                        j this  val val           show visual feedback  incorrect letter appears before disappearing  allows decimals catches multiple     has no issues with left right del etc

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HTML5 supports input type number with global browser support 88   according to CanIUse as of Oct 2015     lt input type  number  step  0 01  min  0  name  askedPrice  id  askedPrice    gt    This is not JQuery related solution  but the advantage is that on mobile phones Android keyboard will be optimized for entering numbers   Alternatively  it is possible to use input type text with new parameter  pattern   More details in HTML5 spec    I think it is better than jquery solution  since in this question provided jquery solution do not support thousands separator  If you can use html5   JSFiddle  https   jsfiddle net p1ue8qxj

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Thanks for the post Dave Aaron Smith  I edited your answer to accept decimal point and number s from number section  This work perfect for me       numeric   keypress function event         Backspace  tab  enter  end  home  left  right decimal   in number part  decimal    in alphabet      We don t support the del key in Opera because del         46    var controlKeys    8  9  13  35  36  37  39 110 190        IE doesn t support indexOf   var isControlKey   controlKeys join      match new RegExp event which         Some browsers just don t raise events for control keys  Easy       e g  Safari backspace    if   event which       Control keys in most browsers  e g  Firefox tab is 0        49  lt   event which  amp  amp  event which  lt   57        Always 1 through 9        96  lt   event which  amp  amp  event which  lt   106        Always 1 through 9 from number section         48    event which  amp  amp    this  attr  value          No 0 first digit        96    event which  amp  amp    this  attr  value          No 0 first digit from number section       isControlKey       Opera assigns values for control keys      return      else       event preventDefault

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As a slight improvement to this suggestion  you can use the Validation plugin with its number    digits  and range methods  For example  the following ensures you get a positive integer between 0 and 50       myform   validate     rules        field          required  true        number  true        digits  true        range    0  50

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Update  There is a new and very simple solution for this      It allows you to use any kind of input filter on a text  lt input gt     including various numeric filters  This will correctly handle   Copy Paste  Drag Drop  keyboard shortcuts  context menu operations    non-typeable keys  and all keyboard layouts    See this answer or try it yourself on JSFiddle   jquery numeric plugin  I ve successfully implemented many forms with the jquery numeric plugin     document  ready function            numeric   numeric          Moreover this works with textareas also   However  note that Ctrl A  Copy Paste  via context menu  and Drag Drop will not work as expected   HTML 5  With wider support for the HTML 5 standard  we can use pattern attribute and number type for input elements to restrict number only input  In some browsers  notably Google Chrome   it works to restrict pasting non-numeric content as well  More information about number and other newer input types is available here

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This is very simple that we have already a javascript inbuilt function  isNaN  is there       numeric   keydown function e     if  isNaN String fromCharCode e which          return false

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This code belongs to restrict alphabets in text boxes have to enter oly number validate on keypress event Hope it will help for you  HTML Tags    lt input id  txtPurchaseAmnt  style  width 103px  type  text  class  txt  maxlength  5  onkeypress  return isNumberKey event      gt    function onlyNumbers key             var keycode    key which    key which   key keyCode          if   keycode  gt  47  amp  amp  keycode  lt  58      keycode    46    keycode    8      keycode    9    keycode    13      keycode    37    keycode    39                  return true                    else               return false

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i use that function and it works fine     document  ready function                  txt Price   keypress function  e                  if the letter is not digit then display error and don t type anything               if  e which    8  amp  amp  e which    0  amp  amp   e which  lt  48    e which  gt  57                if   e which    46      this  val   indexOf         -1   amp  amp   e which  lt  48    e which  gt  57                       display error message                     errmsg   html  Digits Only   show   fadeOut  slow                    return false

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The best way is to check the contects of the text box whenever it loses focus   You can check whether the contents are a  number  using a regular expression   Or you can use the Validation plugin  which basically does this automatically

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You can use the Validation plugin with its number   method         myform   validate     rules        field          required  true        number  true

[jquery] jQuery: what is the best way to restrict "number"-only input for textboxes? (allow decimal points)

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