disable submit if text field is empty using javascript and jquery

empty_check.js

var changeHandler = function (e) {
    console.log ($.trim(this.value));
    if ($.trim(this.value)){
        $("input[type=submit]").removeAttr("disabled");
    } else {
        $("input[type=submit]").attr("disabled", "disabled");        
    }
};

$("input[type=text]").keyup(
    changeHandler
)​

nice