simple validation

HTML

<form id="myForm">
    *<input type="text"  /></br>
    *<input type="text" class="required" /></br>
    <input type="text" /></br>
    <input type="text" /></br>
    <input type="submit"/>
</form>

JavaScript

$(function () {
    var submitButton = $("#myForm input[type='submit']").attr("disabled", true);
    $("#myForm input.required").change(function () {
        var valid = true;
        $.each($("#myForm input.required"), function (index, value) {
            
            if(!$(value).val()){
               valid = false;
            }
        });
        if(valid){
            $(submitButton).attr("disabled", false);
            console.log("valid");
        } 
        else{
             $(submitButton).attr("disabled", true);
        }
    });
});