4
I want me to be able to put only numbers when inserting something in the prompt.
var count = prompt("Teste");
How can I do it?
4
I want me to be able to put only numbers when inserting something in the prompt.
var count = prompt("Teste");
How can I do it?
4
You can create a version of prompt
for this we insist until the user type a number in the form you want:
function promptInt(mensagem, tenteNovamente) {
var msg = mensagem;
while (true) {
var ret = parseInt(prompt(msg));
if (!isNaN(ret)) return ret;
msg = tenteNovamente;
}
}
var count = promptInt("Teste", "Por favor, digite um número.\nTente novamente.");
alert("Você digitou o número " + count + ".");
The function isNaN
is used to verify whether the user has entered a number or not.
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