Programming a loop in JavaScript

Question

I want to create a script that when I write a string to check if this string is a number or no if it isn't a number it should give me the input dialogue again, the is the code I tried:

<script>

var nombre;
nombre = parseInt(prompt("Donnez un nombre entre 0 et 999: "));
var nombreIsInt = false;

while(!nombreIsInt)
{
    if(isNaN(nombre))
        prompt("Svp Saisie un nombre entre 0 et 999: ");
    else
        nombreIsInt = true;
}

</script>

The problem is that when I write a number it gives me the input dialogue again.

Esailija · Accepted Answer · 2012-10-20 10:29:54Z

5

Try a do-while loop:

do {
    var nombre = parseInt(prompt("Donnez un nombre entre 0 et 999: "));
    var nombreIsInt = !isNaN(nombre);
} while (!nombreIsInt);

answered Oct 20, 2012 at 10:29

Esailija

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Comments

rationalboss · Accepted Answer · 2012-10-20 10:28:49Z

3

You need to assign the prompt to nombre. Here:

<script>

var nombre;
nombre = parseInt(prompt("Donnez un nombre entre 0 et 999: "));
var nombreIsInt = false;

while(!nombreIsInt)
{
    if(isNaN(nombre))
        nombre = prompt("Svp Saisie un nombre entre 0 et 999: "); // the problem is here
    else
        nombreIsInt = true;
}

</script>

answered Oct 20, 2012 at 10:28

rationalboss

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1 Comment

GottZ Over a year ago

i would prefer Esailija's answer

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