all input field validation through Jquery in single line

Question

i have a form in which have 30 input box and 10 text area field and all are mandatory fields. How do i apply a validation through jQuery / javascript together for all input field that it can't be blank/empty/NULL. i don't want to use each time each input box's ID and create a separate validation for each input box and text area

if any input field is blank then it's border become red and when a use going to write something then become normal( no border i.e. remove that class)

UPDATE:

there are also select boxes ..how do i validate them together

Answer 1

Something like this:

$("#myForm").submit(function() {

    // if there are some empty inputs
    if($(":input[value]").length != $(":input").length)) {

        // filter out the empty ones, apply some CSS
        $(":input").filter(function() {
            return this.value.length == 0;
        }).addClass("blank");

        // do not submit
        return false;
    }
});

$(":input").blur(function() {
    if(this.value.length > 0) {
        $(this).removeClass("blank");
    }
});

Answer 2

1. Remove the red border from each text, textarea, and list box field.
2. Filter out elements that contain at least 1 non-whitespace character - \S+
3. Add a red border to the remaining elements

javascript

function validate() {
  return $("input:text,textarea,select").removeClass('blank').filter(function() {
    return !/\S+/.test($(this).val());
  }).addClass('blank').size() == 0;
}

$('#form').submit(validate);

css

.blank {
    border: 1px red solid;
}