allowing input only for float number

Question

I have pain-time when making input that only allows float number with jquery library. my code can\'t prevent chacacter \".\" when it\'s becoming first input, can anyone guid

Answer 1

This works for me:

var str = document.getElementById('product_'+id_product).value;
if( !str.match(/^[0-9]*([.,][0-9]+)?$/) ) {
 console.log("Value must be a number or float number");
}else{
 console.log("The number is valid");
}

I hope this can help someone. Regards!