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Home/ Questions/Q 8704557
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Editorial Team
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Editorial Team
Asked: June 13, 20262026-06-13T03:08:10+00:00 2026-06-13T03:08:10+00:00

I want to create a script that when I write a string to check

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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.

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-06-13T03:08:12+00:00Added an answer on June 13, 2026 at 3:08 am

    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>
    
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