How do I make an input field accept only letters in javaScript

Question

function validate     if document myForm name value         alert  Enter a name    document myForm name focus    return false      This is what I ve written it for an empty string  now i need it to accept only letters

User · Answer

function alphaOnly event      var key   event keyCode    return   key  gt   65  amp  amp  key  lt   90     key    8        or  function lettersOnly evt           evt    evt    evt   event         var charCode    evt charCode    evt charCode     evt keyCode    evt keyCode               evt which    evt which   0           if  charCode  gt  31  amp  amp   charCode  lt  65    charCode  gt  90   amp  amp             charCode  lt  97    charCode  gt  122               alert  Enter letters only               return false                  return true

User · Answer

Use onkeyup on the text box and check the keycode of the key pressed  if its between 65 and 90  allow else empty the text box

User · Answer

dep and clg alphabets validation is not working  x000D   x000D  var selectedRow   null   function validateform        var table   document getElementById  mytable      var rowCount   table rows length    console log rowCount      var x   document forms  myform    usrname   value    if  x              alert  name must be filled out        return false         var y   document forms  myform    usremail   value    if  y              alert  email must be filled out        return false        var mail           a-zA-Z     a-zA-Z  2 6     if  mail test y           alert  email must be a valid format          return false       else       alert  not a mail id       return false         var z   document forms  myform    usrage   value    if  z              alert  age must be filled out        return false         if  isNaN z     z  lt  1    z  gt  100        alert  The age must be a number between 1 and 100        return false         var a   document forms  myform    usrdpt   value    if  a              alert  Dept must be filled out        return false         var dept           amp      -                 lt  gt         if  dept match a         alert  special charachers found        return false         var b   document forms  myform    usrclg   value    if  b              alert  College must be filled out        return false        console log table     var row   table insertRow rowCount     row setAttribute  id   rowCount     var cell0   row insertCell 0     var cell1   row insertCell 1     var cell2   row insertCell 2     var cell3   row insertCell 3     var cell4   row insertCell 4     var cell5   row insertCell 5     var cell6   row insertCell 6     var cell7   row insertCell 7       cell0 innerHTML   rowCount    cell1 innerHTML   x    cell2 innerHTML   y    cell3 innerHTML   z    cell4 innerHTML   a    cell5 innerHTML   b    cell6 innerHTML     lt Button type  button  onclick onEdit      x           y           z           a           b           rowCount       gt Edit lt  BUTTON gt      cell7 innerHTML     lt Button type  button  onclick deletefunction     rowCount      gt Delete lt  BUTTON gt        function emptyfunction       document getElementById  usrname   value         document getElementById  usremail   value         document getElementById  usrage   value         document getElementById  usrdpt   value         document getElementById  usrclg   value          function onEdit x  y  z  a  b  rowCount      selectedRow   rowCount    console log selectedRow     document forms  myform    usrname   value   x    document forms  myform    usremail   value   y    document forms  myform    usrage   value   z    document forms  myform    usrdpt   value   a    document forms  myform    usrclg   value   b    document getElementById  Add   style display    none     document getElementById  update   style display    block      function deletefunction rowCount      document getElementById  mytable   deleteRow rowCount      function onUpdatefunction       var row   document getElementById selectedRow     console log row      var x   document forms  myform    usrname   value    if  x              alert  name must be filled out        document myForm x focus        return false         var y   document forms  myform    usremail   value    if  y              alert  email must be filled out        document myForm y focus        return false         var mail           a-zA-Z     a-zA-Z  2 6     if  mail test y           alert  email must be a valid format          return false       else       alert  not a mail id         return false         var z   document forms  myform    usrage   value    if  z              alert  age must be filled out        document myForm z focus        return false        if  isNaN z     z  lt  1    z  gt  100        alert  The age must be a number between 1 and 100        return false         var a   document forms  myform    usrdpt   value    if  a              alert  Dept must be filled out        return false        var letters      A-Za-z        if  a test letters           Your logice will be here      else       alert  Please enter only alphabets        return false         var b   document forms  myform    usrclg   value    if  b              alert  College must be filled out        return false        var letters      A-Za-z        if  b test letters           Your logice will be here      else       alert  Please enter only alphabets        return false         row cells 1  innerHTML   x    row cells 2  innerHTML   y    row cells 3  innerHTML   z    row cells 4  innerHTML   a    row cells 5  innerHTML   b    x000D   lt html gt    lt head gt   lt  head gt    lt body gt     lt form name  myform  gt       lt h1 gt         lt center gt  Admission form  lt  center gt       lt  h1 gt       lt center gt         lt tr gt           lt td gt Name   lt  td gt           lt td gt  lt input type  text  name  usrname  PlaceHolder  Enter Your First Name  required gt  lt  td gt         lt  tr gt          lt tr gt           lt td gt  Email ID   lt  td gt           lt td gt  lt input type  text  name  usremail  PlaceHolder  Enter Your email address  pattern         a-zA-Z     a-zA-Z  2 6   required gt  lt  td gt         lt  tr gt          lt tr gt           lt td gt Age   lt  td gt           lt td gt  lt input type  number  name  usrage  PlaceHolder  Enter Your Age  required gt  lt  td gt         lt  tr gt          lt tr gt           lt td gt Dept   lt  td gt           lt td gt  lt input type  text  name  usrdpt  PlaceHolder  Enter Dept  gt  lt  td gt         lt  tr gt          lt tr gt           lt td gt College   lt  td gt           lt td gt  lt input type  text  name  usrclg  PlaceHolder  Enter college  gt  lt  td gt         lt  tr gt       lt  center gt        lt center gt         lt br gt         lt br gt         lt tr gt           lt td gt             lt Button type  button  onclick  validateform    id  Add  gt Add lt  button gt           lt  td gt           lt td gt             lt Button type  button  onclick  onUpdatefunction    style  display none   id  update  gt update lt  button gt           lt  td gt           lt td gt  lt button type  reset  gt Reset lt  button gt  lt  td gt         lt  tr gt       lt  center gt       lt br gt  lt br gt       lt center gt         lt table id  mytable  border  1  gt           lt tr gt             lt th gt SNO lt  th gt             lt th gt Name lt  th gt             lt th gt Email ID lt  th gt             lt th gt Age lt  th gt             lt th gt Dept lt  th gt             lt th gt College lt  th gt           lt  tr gt       lt  center gt       lt  table gt     lt  form gt   lt  body gt    lt  html gt  x000D   x000D   x000D

User · Answer

If you want only letters - so from a to z  lower case or upper case  excluding everything else  numbers  blank spaces  symbols   you can modify your function like this   function validate         if  document myForm name value                  alert  Enter a name            document myForm name focus            return false            if      a-zA-Z    g test document myForm name value             alert  Invalid characters            document myForm name focus            return false

User · Answer

Try this   var alphaExp      a-zA-Z                  if document myForm name match alphaExp                                   Your logice will be here                            else                  alert  Please enter only alphabets                    Thanks

[javascript] How do I make an input field accept only letters in javaScript?

Examples related to javascript

Examples related to validation

Examples related to input