Decimal Validation In The Textfield Using Javascript Or Jquery

i Want to validate a text field in keyup event . in the field it should accept money type decimal like (12.23) (.23) (0.26) (5.09) (6.00) if i enter some wrong value then it shoul

Solution 1:

I think something like this might be your best bet

var isValidCurrency = function(str) {
  var num = parseFloat(str);
  return !Number.isNaN(num) && num.toFixed(2).toString() === str;
};

Some tests

isValidCurrency("1234.56");   //true
isValidCurrency("1234.565");  //false
isValidCurrency("1234");      //false
isValidCurrency("foo");       //false

Solution 2:

You can use following Regex

val = "2.13"if (!val.match(/^(\d{0,2})(\.\d{2})$/)) {
    alert("wrong");
} else {
    alert("right");
}

http://jsfiddle.net/rtL3J/1/

EDIT

Please note that if the numbers preceding dot (.) has limit of length to two then the code valid code is

^(\d{0,2})(\.\d{2})$

else if there is no limit then just remove the 2 from the code i.e.

^(\d{0,})(\.\d{2})$

Solution 3:

Try this:

functionevMoneyFormat(evt) {
    //--- only accepts accepts number and 2 decimal place valuevar theEvent = evt || window.event;
    var key = theEvent.keyCode || theEvent.which;
    key = String.fromCharCode(key);
    var regex = /^[0-9]{1,14}\.[0-9]{0,2}$/; // number with 2 decimal placesif (!regex.test(key)) {
        theEvent.returnValue = false;
        //--- this prevents the character from being displayedif (theEvent.preventDefault) theEvent.preventDefault();
    }
}

The control:

<inputtype='text' onkeyup='evMoneyFormat( e );'>

Solution 4:

Try following code

functionvalidateDecimal(num){

   var dotPosition=num.indexOf(".");

   if(dotPosition=="-1"){
      document.getElementById('cost').value= num+".00"
   }
}

And in html

<inputtype="text"id='cost' onkeyup="validateDecimal(this.value)" />