Auto Update form field from integer to decimal

Question

I have two form fields for users to enter weight in kg and length in meters, most users consider the length in centimeters which gives wrong calculations. can I have a way to auto update form in the case of entering integer ? ( e.g. 170 to be automatically converted to 1.7 ) ?

Answer 1

You may check if the value is an integer like that:

var isInt = function(n) {
   return n % 1 === 0;
}

Here is a js fiddle showing this in action http://jsfiddle.net/krasimir/6e72q/

HTML

<input type="text" id="field"/>

JS

var field = document.getElementById("field");
field.addEventListener("change", function() {
    var value = field.value;
    if(isInt(value)) {
        field.value = value = value / 100;
    }
});
var isInt = function(n) {
   return n % 1 === 0;
}