[javascript] Which fields are filled or empty in my form?

map_which_fields_are_filled_or_not.js

var map_which_fields_are_filled_or_not = function (form_id) {
    /* for each field on form, recognize if it's filled or not.

       Returns:
       - {
          "field_a": true, // filled
          "field_b": false // empty (not filled)
         }
     */

    var fields = {};

    $('#'+form_id).find(':input').filter(':visible').each(function() {
        if (!this.name) {
            return;
        }

        if ((this.type === 'checkbox') || (this.type === 'radio')) {
            if (!fields[this.name]) {
                fields[this.name] = $("#"+this.id).prop('checked');
            }
        } else {
            fields[this.name] = ($("#"+this.id).val().length > 0);
        }
    });

    return fields;
};