Check if cookie exists with Javascript

Question

I have a cookie set with javascript, I created it like this:

document.cookie='gravado=sim'

I don’t know how I’m gonna make sure he exists. I need to make a check because if it does not exist, I will redirect to another page, also need to know how to destroy this cookie

Answer 1

You can check this way

if (document.cookie.indexOf("gravado") < 0) {
        alert("O cookie não existe vou criar");
        document.cookie="gravado=sim";
    }
    else {    
        alert("Já está gravado, vou eliminar");  
        document.cookie ="gravado=; expires=Thu, 01 Jan 1970 00:00:01 GMT;";
    }