checking if number entered is a digit in jquery

Question

I have a simple textbox in which users enter number  Does jQuery have a isDigit function that will allow me to show an alert box if users enter something other than digits   The field can have decimal points as well

User · Answer

var yourfield      fieldname   val     if   isNumeric yourfield              console log  IM A NUMBER      else            console log  not a number        JQUERY DOCS   https   api jquery com jQuery isNumeric

User · Answer

With jQuery s validation plugin you could do something like this  assuming that the form is called form and the value to validate is called nrInput     form   validate               errorElement   div               errorClass   error-highlight               onblur  true              onsubmit  true              focusInvalid  true              rules                    nrInput                         number  true                      required  true                                     This also handles decimal values

User · Answer

Value validation wouldn t be a responsibility of jQuery  You can use pure JavaScript for this  Two ways that come to my mind are      d    match value  Number value     value

User · Answer

Following script can be used to check whether value is valid integer or not     function myFunction         var a   parseInt  10000000        if   isNaN a   amp  amp  a  lt   2147483647  amp  amp  a  gt   -2147483647       alert  is integer           else        alert  not integer

User · Answer

there is a simpler way of checking if a variable is an integer  you can use   isNumeric   function  e g     isNumeric  10           true   this will return true but if you put a string in place of the 10  you will get false   I hope this works for you

User · Answer

jQuery is a set of JavaScript functions  right  So you could use JavaScript s regular expression support to validate the string  You can put this in a jQuery callback if you like  too  since those just take anonymously-declared function bodies and the functions are still JavaScript  Link  http   www regular-expressions info javascript html

User · Answer

I would suggest using regexes   var intRegex      d     var floatRegex        d     d         d      d        var str       myTextBox   val    if intRegex test str     floatRegex test str        alert  I am a number               Or with a single regex as per  Platinum Azure s suggestion   var numberRegex       -   d     d     eE   -   d       var str       myTextBox   val    if numberRegex test str        alert  I am a number

User · Answer

Forget regular expressions   JavaScript has a builtin function for this  isNaN     isNaN 123               false isNaN -1 23             false isNaN 5-2               false isNaN 0                 false isNaN  100              false isNaN  Hello            true isNaN  2005 12 12       true   Just call it like so   if  isNaN      whatever   val               It isn t a number   else          It is a number

User · Answer

document  ready function                 cust zip   keypress function  e              var z   document createUserForm cust mobile1 value            alert z           if  e which    8  amp  amp  e which    0  amp  amp   e which  lt  48    e which  gt  57                      errmsgzip   html  Digits Only    show   fadeOut 3000               return false

User · Answer

String prototype isNumeric   function         var s   this replace           replace   s  g       return s    0     s s       usage   9 1  isNumeric   - gt  1  0xabc  isNumeric   - gt  1  10 1  isNumeric   - gt  1  str  isNumeric   - gt  NaN

[javascript] checking if number entered is a digit in jquery

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