asked on

I need a function in Javascript that can valid my value

Hello Guys

I have a value and this value is the minor value, for example:

20

The user will enter with its value, for example: 55

The function must check if the value is a multiple of 20, then, the system can only accept

20, 40, 60, 80, 90...

If the user enter with 55, the system must indicate a valid upper value, for example : 60

if the user enter 71 the system must appoint the upper valid value of 80.

Function checkValue(valueMinor, ValueUser){
}

thanks

MacAnthony

Try this:

function checkValue(valueMinor,ValueUser) {
    try {
        var val = parseInt(valueMinor);
        var offset = 20-(val % 20);
        return val+offset;
    } catch(e) {}
}

Open in new window

HonorGod

I don't think that will do it.
I think it needs to be a little more complicated, perhaps something like this

<html>
<body>

<script type='text/javascript'>
  function checkValue( valueMinor, ValueUser ) {
    var result = 0
    try {
        var user = parseInt( ValueUser )
        var low  = user - valueMinor
        var rem  = low % 20
        result = ( user - rem ) + ( ( rem > 0 ) ? 20 : 0 )
    } catch(e) {}
    alert( 'result: ' + result )
    return result
  }
</script>

<input type=text onchange='checkValue(20,this.value)'>
</body>
</html>

Open in new window

ASKER CERTIFIED SOLUTION

MacAnthony

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

SOLUTION