asked on

IsNumber event

Hi experts, Codes below do not allow any character except the number. However, I need to exclude the (.) or point so that i could write something like this, 10.88. Which part of the code should i chagnge or add to achieve the goal? Thank you!

Js

function isNumber(evt) 
{
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode > 31 && (charCode < 48 || charCode > 57)) 
{
alert("Please note that only number is allowed in the box!");
return false;
}
return true;    
}

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Wilson Net

Hi Whing,

for that type of control in my opinion the best is to use RegExp, try using the code below:

function isNumber(e) {
    var key = (document.all) ? e.keyCode : e.which;
    var expression = /[-?\d\.]/; // allow only numbers and point
    var te = String.fromCharCode(key);

    if(expression.test(te)){
        return true;
    }else{
        alert("Please note that only number is allowed in the box!");
        return false;    
    }
}

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HainKurt

here

https://jsfiddle.net/4evqxd6h/

function isNumber(evt) {
  evt = (evt) ? evt : window.event;
  var charCode = (evt.which) ? evt.which : evt.keyCode;
  console.log(charCode);
  if (!((charCode >= 48 && charCode <= 57) || (charCode == 46))) {
    alert("Please note that only number is allowed in the box!");
    return false;
  }
  return true;
}

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* it does not detect "." in front at the end or multiples :)

HainKurt

another way of writing above code

function isNumber(evt) {
  evt = (evt) ? evt : window.event;
  var charCode = (evt.which) ? evt.which : evt.keyCode;
  var charOk = "0123456789.".indexOf(String.fromCharCode(charCode)) > -1;
  console.log(charCode);
  if (!charOk) {
    alert("Please note that only number is allowed in the box!");
    return false;
  }
  return true;
}

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