Validación formulario en javascript

[lamenenchu]

Código:

if ($this.data("validation") !== undefined) {
            validatorNames = $this.data("validation").split(",");
          }

          // Get extra ones defined on the element's data attributes
          $.each($this.data(), function (i, el) {
            var parts = i.replace(/([A-Z])/g, ",$1").split(",");
            if (parts[0] === "validation" && parts[1]) {
              validatorNames.push(parts[1]);
            }
          });

          // =============================================================
          //                                     NORMALISE VALIDATOR NAMES
          // =============================================================

          var validatorNamesToInspect = validatorNames;
          var newValidatorNamesToInspect = [];

          do // repeatedly expand 'shortcut' validators into their real validators
          {
            // Uppercase only the first letter of each name
            $.each(validatorNames, function (i, el) {
              validatorNames[i] = formatValidatorName(el);
            });

            // Remove duplicate validator names
            validatorNames = $.unique(validatorNames);

            // Pull out the new validator names from each shortcut
            newValidatorNamesToInspect = [];
            $.each(validatorNamesToInspect, function(i, el) {
              if ($this.data("validation" + el + "Shortcut") !== undefined) {
                // Are these custom validators?
                // Pull them out!
                $.each($this.data("validation" + el + "Shortcut").split(","), function(i2, el2) {
                  newValidatorNamesToInspect.push(el2);
                });
              } else if (settings.builtInValidators[el.toLowerCase()]) {
                // Is this a recognised built-in?
                // Pull it out!
                var validator = settings.builtInValidators[el.toLowerCase()];
                if (validator.type.toLowerCase() === "shortcut") {
                  $.each(validator.shortcut.split(","), function (i, el) {
                    el = formatValidatorName(el);
                    newValidatorNamesToInspect.push(el);
                    validatorNames.push(el);
                  });
                }
              }
            });

            validatorNamesToInspect = newValidatorNamesToInspect;

          } while (validatorNamesToInspect.length > 0)

          // =============================================================
          //                                       SET UP VALIDATOR ARRAYS
          // =============================================================

          var validators = {};

          $.each(validatorNames, function (i, el) {
            // Set up the 'override' message
            var message = $this.data("validation" + el + "Message");
            var hasOverrideMessage = (message !== undefined);
            var foundValidator = false;
            message =
              (
                message
                  ? message
                  : "'" + el + "' validation failed <!-- Add attribute 'data-validation-" + el.toLowerCase() + "-message' to input to change this message -->"
              )
            ;

            $.each(
              settings.validatorTypes,
              function (validatorType, validatorTemplate) {
                if (validators[validatorType] === undefined) {
                  validators[validatorType] = [];
                }
                if (!foundValidator && $this.data("validation" + el + formatValidatorName(validatorTemplate.name)) !== undefined) {
                  validators[validatorType].push(
                    $.extend(
                      true,
                      {
                        name: formatValidatorName(validatorTemplate.name),
                        message: message
                      },
                      validatorTemplate.init($this, el)
                    )
                  );
                  foundValidator = true;
                }
              }
            );

            if (!foundValidator && settings.builtInValidators[el.toLowerCase()]) {

              var validator = $.extend(true, {}, settings.builtInValidators[el.toLowerCase()]);
              if (hasOverrideMessage) {
                validator.message = message;
              }
              var validatorType = validator.type.toLowerCase();

              if (validatorType === "shortcut") {
                foundValidator = true;
              } else {
                $.each(
                  settings.validatorTypes,
                  function (validatorTemplateType, validatorTemplate) {
                    if (validators[validatorTemplateType] === undefined) {
                      validators[validatorTemplateType] = [];
                    }
                    if (!foundValidator && validatorType === validatorTemplateType.toLowerCase()) {
                      $this.data("validation" + el + formatValidatorName(validatorTemplate.name), validator[validatorTemplate.name.toLowerCase()]);
                      validators[validatorType].push(
                        $.extend(
                          validator,
                          validatorTemplate.init($this, el)
                        )
                      );
                      foundValidator = true;
                    }
                  }
                );
              }
            }

            if (! foundValidator) {
              $.error("Cannot find validation info for '" + el + "'");
            }
          });