Check whether a value is a number in JavaScript or jQuery

Question

Possible Duplicate    Validate numbers in JavaScript - IsNumeric         var miscCharge       miscCharge   val      I want to check misCharge is number or not  Is there any method or easy way in jQuery or JavaScript to do this   HTMl is    lt g textField name  miscCharge   id   miscCharge  value    size  9  max  100000000000  min  0    gt

User · Answer

You ve an number of options  depending on how you want to play it   isNaN val    Returns true if val is not a number  false if it is  In your case  this is probably what you need   isFinite val    Returns true if val  when cast to a String  is a number and it is not equal to   - Infinity     d    test val    Returns true if val  when cast to a String  has only digits  probably not what you need

User · Answer

function isNumber n      return  isNaN parseFloat n    amp  amp  isFinite n

User · Answer

there is a function called isNaN it return true if it s  Not-a-number    so u can check for a number this way  if  isNaN miscCharge          do some thing if it s a number  else       do some thing if it s NOT a number     hope it works

[javascript] Check whether a value is a number in JavaScript or jQuery

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