how to check if input field is empty

Question

I\'m making a form with inputs, if the input type is empty then the button submit is disabled but, if the input fields is with length > 0 the submit button is enabled

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Answer 1

This snippet will handle more than two checkboxes in case you decide to expand the form.

$("input[type=text]").keyup(function(){
    var count = 0, attr = "disabled", $sub = $("#submit"), $inputs = $("input[type=text]");  
    $inputs.each(function(){
        count += ($.trim($(this).val())) ? 1:0;
    });
    (count >= $inputs.length ) ? $sub.removeAttr(attr):$sub.attr(attr,attr);       
});

Working Example: http://jsfiddle.net/sr4gq/