SimpleEmailValidation

function EmailValidation(){
    var email = document.getElementById('text').value;
    var flag = 0;

    for(var i =0;i<email.length;i++){
        if(email.indexOf('@') == i){
            flag++;
        }
    }
    if(email.indexOf('@') < 1){
        alert("Error gaada @ / didepan");
    }else if(email.indexOf('@') == email.length-1){
        alert("Error @ diujung");
    }else if(email.indexOf('.') < 1){
        alert("Error gada . / didepan");
    }else if(email.indexOf('.') == email.length-1){
        alert("Error . diujung");
    }else if(flag > 1){
        alert("Error @ ada 2");
    }else if(email.indexOf('@') == email.indexOf('.')-1 || email.indexOf('@') == email.indexOf('.')+1){
        alert("Error @ dan . sebelahan")
    }else{
        alert("True validate");
    }
}