# Function that transforms value of an input

1

I have an input that collects the value of height, and a function that transforms the value:

• case 1: if income 123 adds a zero (0) and the result is 123.0 THIS GOOD
• case 2: if you enter 123.4, leave it as is. IT'S GOOD
case 3: if income 99 adds a zero (0) and the result is 123.0 THIS GOOD
• case 4: if I enter 1.23 I will transform it to 123.0 THIS GOOD
• But in case 5: if I enter 99.4 he transforms it to 994.00. THAT'S WRONG. I should leave it equal 99.4.

THIS IS MY FUNCTION:

function format(input){
var num = input.value.replace(/\./g,'');
if(!isNaN(num)){
if(num.length>3){
num=num.substring(0,num.length-2)+'.'+num.substring(num.length-2);

}
console.log(parseFloat(Math.round(num * 100) / 100).toFixed(1));
}
}
<input type="text" id="ejemplo" name="ejemplo"/>
<button type="button"  onclick="format(ejemplo)">Prueba</button>

asked by Carla Noguera 10.11.2017 в 17:20
source

2

It seems that what you want is to calculate the height in centimeters with a decimal, although you allow the user to enter the amount in centimeters or in meters.

A possible solution would be to check if the value entered is less than 3 and multiply by 100 in those cases (because the data entered will have been in meters). From that, you would perform the operations you want, which is really none ... because toFixed will do the rounding for you, so the Math.round is unnecessary.

function format(input) {

// leemos el numero
var num = parseFloat(input.value);

// si esta en metros lo pasamos a centimetros
if (num < 3) {
num = num * 100;
}

// mostramos el resultado en centimetros
console.log(parseFloat(num).toFixed(1));
}
<input type="text" id="ejemplo" name="ejemplo" />
<button type="button" onclick="format(ejemplo)">Prueba</button>