can display server-side errors on the UI.

Gruntfile.js

@@ -21,6 +21,8 @@ module.exports = function (grunt) {
             'UI/JsLibraries/backbone.backgrid.paginator.js'  : 'http://raw.github.com/wyuenho/backgrid/master/lib/extensions/paginator/backgrid-paginator.js',
             'UI/JsLibraries/backbone.backgrid.filter.js'     : 'http://raw.github.com/wyuenho/backgrid/master/lib/extensions/filter/backgrid-filter.js',
 
+            'UI/JsLibraries/backbone.validation.js'          : 'https://raw.github.com/thedersen/backbone.validation/master/dist/backbone-validation.js',
+
             'UI/JsLibraries/handlebars.runtime.js'           : 'http://raw.github.com/wycats/handlebars.js/master/dist/handlebars.runtime.js',
             'UI/JsLibraries/handlebars.helpers.js'           : 'http://raw.github.com/danharper/Handlebars-Helpers/master/helpers.js',
 

NzbDrone.Api/Indexers/IndexerModule.cs

@@ -6,6 +6,7 @@
 using NzbDrone.Api.REST;
 using NzbDrone.Core.Indexers;
 using Omu.ValueInjecter;
+using FluentValidation;
 
 namespace NzbDrone.Api.Indexers
 {
@@ -20,6 +21,12 @@ public IndexerModule(IIndexerService indexerService)
             CreateResource = CreateIndexer;
             UpdateResource = UpdateIndexer;
             DeleteResource = DeleteIndexer;
+
+
+            SharedValidator.RuleFor(c => c.Name).NotEmpty();
+            SharedValidator.RuleFor(c => c.Implementation).NotEmpty();
+
+            PostValidator.RuleFor(c => c.Fields).NotEmpty();
         }
 
         private List<IndexerResource> GetAll()

UI/JsLibraries/backbone.validation.js

@@ -0,0 +1,606 @@
+// Backbone.Validation v0.8.1
+//
+// Copyright (c) 2011-2013 Thomas Pedersen
+// Distributed under MIT License
+//
+// Documentation and full license available at:
+// http://thedersen.com/projects/backbone-validation
+Backbone.Validation = (function(_){
+  'use strict';
+
+  // Default options
+  // ---------------
+
+  var defaultOptions = {
+    forceUpdate: false,
+    selector: 'name',
+    labelFormatter: 'sentenceCase',
+    valid: Function.prototype,
+    invalid: Function.prototype
+  };
+
+
+  // Helper functions
+  // ----------------
+
+  // Formatting functions used for formatting error messages
+  var formatFunctions = {
+    // Uses the configured label formatter to format the attribute name
+    // to make it more readable for the user
+    formatLabel: function(attrName, model) {
+      return defaultLabelFormatters[defaultOptions.labelFormatter](attrName, model);
+    },
+
+    // Replaces nummeric placeholders like {0} in a string with arguments
+    // passed to the function
+    format: function() {
+      var args = Array.prototype.slice.call(arguments),
+          text = args.shift();
+      return text.replace(/\{(\d+)\}/g, function(match, number) {
+        return typeof args[number] !== 'undefined' ? args[number] : match;
+      });
+    }
+  };
+
+  // Flattens an object
+  // eg:
+  //
+  //     var o = {
+  //       address: {
+  //         street: 'Street',
+  //         zip: 1234
+  //       }
+  //     };
+  //
+  // becomes:
+  //
+  //     var o = {
+  //       'address.street': 'Street',
+  //       'address.zip': 1234
+  //     };
+  var flatten = function (obj, into, prefix) {
+    into = into || {};
+    prefix = prefix || '';
+
+    _.each(obj, function(val, key) {
+      if(obj.hasOwnProperty(key)) {
+        if (val && typeof val === 'object' && !(
+          val instanceof Array ||
+          val instanceof Date ||
+          val instanceof RegExp ||
+          val instanceof Backbone.Model ||
+          val instanceof Backbone.Collection)
+        ) {
+          flatten(val, into, prefix + key + '.');
+        }
+        else {
+          into[prefix + key] = val;
+        }
+      }
+    });
+
+    return into;
+  };
+
+  // Validation
+  // ----------
+
+  var Validation = (function(){
+
+    // Returns an object with undefined properties for all
+    // attributes on the model that has defined one or more
+    // validation rules.
+    var getValidatedAttrs = function(model) {
+      return _.reduce(_.keys(model.validation || {}), function(memo, key) {
+        memo[key] = void 0;
+        return memo;
+      }, {});
+    };
+
+    // Looks on the model for validations for a specified
+    // attribute. Returns an array of any validators defined,
+    // or an empty array if none is defined.
+    var getValidators = function(model, attr) {
+      var attrValidationSet = model.validation ? model.validation[attr] || {} : {};
+
+      // If the validator is a function or a string, wrap it in a function validator
+      if (_.isFunction(attrValidationSet) || _.isString(attrValidationSet)) {
+        attrValidationSet = {
+          fn: attrValidationSet
+        };
+      }
+
+      // Stick the validator object into an array
+      if(!_.isArray(attrValidationSet)) {
+        attrValidationSet = [attrValidationSet];
+      }
+
+      // Reduces the array of validators into a new array with objects
+      // with a validation method to call, the value to validate against
+      // and the specified error message, if any
+      return _.reduce(attrValidationSet, function(memo, attrValidation) {
+        _.each(_.without(_.keys(attrValidation), 'msg'), function(validator) {
+          memo.push({
+            fn: defaultValidators[validator],
+            val: attrValidation[validator],
+            msg: attrValidation.msg
+          });
+        });
+        return memo;
+      }, []);
+    };
+
+    // Validates an attribute against all validators defined
+    // for that attribute. If one or more errors are found,
+    // the first error message is returned.
+    // If the attribute is valid, an empty string is returned.
+    var validateAttr = function(model, attr, value, computed) {
+      // Reduces the array of validators to an error message by
+      // applying all the validators and returning the first error
+      // message, if any.
+      return _.reduce(getValidators(model, attr), function(memo, validator){
+        // Pass the format functions plus the default
+        // validators as the context to the validator
+        var ctx = _.extend({}, formatFunctions, defaultValidators),
+            result = validator.fn.call(ctx, value, attr, validator.val, model, computed);
+
+        if(result === false || memo === false) {
+          return false;
+        }
+        if (result && !memo) {
+          return validator.msg || result;
+        }
+        return memo;
+      }, '');
+    };
+
+    // Loops through the model's attributes and validates them all.
+    // Returns and object containing names of invalid attributes
+    // as well as error messages.
+    var validateModel = function(model, attrs) {
+      var error,
+          invalidAttrs = {},
+          isValid = true,
+          computed = _.clone(attrs),
+          flattened = flatten(attrs);
+
+      _.each(flattened, function(val, attr) {
+        error = validateAttr(model, attr, val, computed);
+        if (error) {
+          invalidAttrs[attr] = error;
+          isValid = false;
+        }
+      });
+
+      return {
+        invalidAttrs: invalidAttrs,
+        isValid: isValid
+      };
+    };
+
+    // Contains the methods that are mixed in on the model when binding
+    var mixin = function(view, options) {
+      return {
+
+        // Check whether or not a value passes validation
+        // without updating the model
+        preValidate: function(attr, value) {
+          return validateAttr(this, attr, value, _.extend({}, this.attributes));
+        },
+
+        // Check to see if an attribute, an array of attributes or the
+        // entire model is valid. Passing true will force a validation
+        // of the model.
+        isValid: function(option) {
+          var flattened = flatten(this.attributes);
+
+          if(_.isString(option)){
+            return !validateAttr(this, option, flattened[option], _.extend({}, this.attributes));
+          }
+          if(_.isArray(option)){
+            return _.reduce(option, function(memo, attr) {
+              return memo && !validateAttr(this, attr, flattened[attr], _.extend({}, this.attributes));
+            }, true, this);
+          }
+          if(option === true) {
+            this.validate();
+          }
+          return this.validation ? this._isValid : true;
+        },
+
+        // This is called by Backbone when it needs to perform validation.
+        // You can call it manually without any parameters to validate the
+        // entire model.
+        validate: function(attrs, setOptions){
+          var model = this,
+              validateAll = !attrs,
+              opt = _.extend({}, options, setOptions),
+              validatedAttrs = getValidatedAttrs(model),
+              allAttrs = _.extend({}, validatedAttrs, model.attributes, attrs),
+              changedAttrs = flatten(attrs || allAttrs),
+
+              result = validateModel(model, allAttrs);
+
+          model._isValid = result.isValid;
+
+          // After validation is performed, loop through all changed attributes
+          // and call the valid callbacks so the view is updated.
+          _.each(validatedAttrs, function(val, attr){
+            var invalid = result.invalidAttrs.hasOwnProperty(attr);
+            if(!invalid){
+              opt.valid(view, attr, opt.selector);
+            }
+          });
+
+          // After validation is performed, loop through all changed attributes
+          // and call the invalid callback so the view is updated.
+          _.each(validatedAttrs, function(val, attr){
+            var invalid = result.invalidAttrs.hasOwnProperty(attr),
+                changed = changedAttrs.hasOwnProperty(attr);
+
+            if(invalid && (changed || validateAll)){
+              opt.invalid(view, attr, result.invalidAttrs[attr], opt.selector);
+            }
+          });
+
+          // Trigger validated events.
+          // Need to defer this so the model is actually updated before
+          // the event is triggered.
+          _.defer(function() {
+            model.trigger('validated', model._isValid, model, result.invalidAttrs);
+            model.trigger('validated:' + (model._isValid ? 'valid' : 'invalid'), model, result.invalidAttrs);
+          });
+
+          // Return any error messages to Backbone, unless the forceUpdate flag is set.
+          // Then we do not return anything and fools Backbone to believe the validation was
+          // a success. That way Backbone will update the model regardless.
+          if (!opt.forceUpdate && _.intersection(_.keys(result.invalidAttrs), _.keys(changedAttrs)).length > 0) {
+            return result.invalidAttrs;
+          }
+        }
+      };
+    };
+
+    // Helper to mix in validation on a model
+    var bindModel = function(view, model, options) {
+      _.extend(model, mixin(view, options));
+    };
+
+    // Removes the methods added to a model
+    var unbindModel = function(model) {
+      delete model.validate;
+      delete model.preValidate;
+      delete model.isValid;
+    };
+
+    // Mix in validation on a model whenever a model is
+    // added to a collection
+    var collectionAdd = function(model) {
+      bindModel(this.view, model, this.options);
+    };
+
+    // Remove validation from a model whenever a model is
+    // removed from a collection
+    var collectionRemove = function(model) {
+      unbindModel(model);
+    };
+
+    // Returns the public methods on Backbone.Validation
+    return {
+
+      // Current version of the library
+      version: '0.8.1',
+
+      // Called to configure the default options
+      configure: function(options) {
+        _.extend(defaultOptions, options);
+      },
+
+      // Hooks up validation on a view with a model
+      // or collection
+      bind: function(view, options) {
+        var model = view.model,
+            collection = view.collection;
+
+        options = _.extend({}, defaultOptions, defaultCallbacks, options);
+
+        if(typeof model === 'undefined' && typeof collection === 'undefined'){
+          throw 'Before you execute the binding your view must have a model or a collection.\n' +
+                'See http://thedersen.com/projects/backbone-validation/#using-form-model-validation for more information.';
+        }
+
+        if(model) {
+          bindModel(view, model, options);
+        }
+        else if(collection) {
+          collection.each(function(model){
+            bindModel(view, model, options);
+          });
+          collection.bind('add', collectionAdd, {view: view, options: options});
+          collection.bind('remove', collectionRemove);
+        }
+      },
+
+      // Removes validation from a view with a model
+      // or collection
+      unbind: function(view) {
+        var model = view.model,
+            collection = view.collection;
+
+        if(model) {
+          unbindModel(view.model);
+        }
+        if(collection) {
+          collection.each(function(model){
+            unbindModel(model);
+          });
+          collection.unbind('add', collectionAdd);
+          collection.unbind('remove', collectionRemove);
+        }
+      },
+
+      // Used to extend the Backbone.Model.prototype
+      // with validation
+      mixin: mixin(null, defaultOptions)
+    };
+  }());
+
+
+  // Callbacks
+  // ---------
+
+  var defaultCallbacks = Validation.callbacks = {
+
+    // Gets called when a previously invalid field in the
+    // view becomes valid. Removes any error message.
+    // Should be overridden with custom functionality.
+    valid: function(view, attr, selector) {
+      view.$('[' + selector + '~="' + attr + '"]')
+          .removeClass('invalid')
+          .removeAttr('data-error');
+    },
+
+    // Gets called when a field in the view becomes invalid.
+    // Adds a error message.
+    // Should be overridden with custom functionality.
+    invalid: function(view, attr, error, selector) {
+      view.$('[' + selector + '~="' + attr + '"]')
+          .addClass('invalid')
+          .attr('data-error', error);
+    }
+  };
+
+
+  // Patterns
+  // --------
+
+  var defaultPatterns = Validation.patterns = {
+    // Matches any digit(s) (i.e. 0-9)
+    digits: /^\d+$/,
+
+    // Matched any number (e.g. 100.000)
+    number: /^-?(?:\d+|\d{1,3}(?:,\d{3})+)(?:\.\d+)?$/,
+
+    // Matches a valid email address (e.g. mail@example.com)
+    email: /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))$/i,
+
+    // Mathes any valid url (e.g. http://www.xample.com)
+    url: /^(https?|ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i
+  };
+
+
+  // Error messages
+  // --------------
+
+  // Error message for the build in validators.
+  // {x} gets swapped out with arguments form the validator.
+  var defaultMessages = Validation.messages = {
+    required: '{0} is required',
+    acceptance: '{0} must be accepted',
+    min: '{0} must be greater than or equal to {1}',
+    max: '{0} must be less than or equal to {1}',
+    range: '{0} must be between {1} and {2}',
+    length: '{0} must be {1} characters',
+    minLength: '{0} must be at least {1} characters',
+    maxLength: '{0} must be at most {1} characters',
+    rangeLength: '{0} must be between {1} and {2} characters',
+    oneOf: '{0} must be one of: {1}',
+    equalTo: '{0} must be the same as {1}',
+    pattern: '{0} must be a valid {1}'
+  };
+
+  // Label formatters
+  // ----------------
+
+  // Label formatters are used to convert the attribute name
+  // to a more human friendly label when using the built in
+  // error messages.
+  // Configure which one to use with a call to
+  //
+  //     Backbone.Validation.configure({
+  //       labelFormatter: 'label'
+  //     });
+  var defaultLabelFormatters = Validation.labelFormatters = {
+
+    // Returns the attribute name with applying any formatting
+    none: function(attrName) {
+      return attrName;
+    },
+
+    // Converts attributeName or attribute_name to Attribute name
+    sentenceCase: function(attrName) {
+      return attrName.replace(/(?:^\w|[A-Z]|\b\w)/g, function(match, index) {
+        return index === 0 ? match.toUpperCase() : ' ' + match.toLowerCase();
+      }).replace(/_/g, ' ');
+    },
+
+    // Looks for a label configured on the model and returns it
+    //
+    //      var Model = Backbone.Model.extend({
+    //        validation: {
+    //          someAttribute: {
+    //            required: true
+    //          }
+    //        },
+    //
+    //        labels: {
+    //          someAttribute: 'Custom label'
+    //        }
+    //      });
+    label: function(attrName, model) {
+      return (model.labels && model.labels[attrName]) || defaultLabelFormatters.sentenceCase(attrName, model);
+    }
+  };
+
+
+  // Built in validators
+  // -------------------
+
+  var defaultValidators = Validation.validators = (function(){
+    // Use native trim when defined
+    var trim = String.prototype.trim ?
+      function(text) {
+        return text === null ? '' : String.prototype.trim.call(text);
+      } :
+      function(text) {
+        var trimLeft = /^\s+/,
+            trimRight = /\s+$/;
+
+        return text === null ? '' : text.toString().replace(trimLeft, '').replace(trimRight, '');
+      };
+
+    // Determines whether or not a value is a number
+    var isNumber = function(value){
+      return _.isNumber(value) || (_.isString(value) && value.match(defaultPatterns.number));
+    };
+
+    // Determines whether or not a value is empty
+    var hasValue = function(value) {
+      return !(_.isNull(value) || _.isUndefined(value) || (_.isString(value) && trim(value) === '') || (_.isArray(value) && _.isEmpty(value)));
+    };
+
+    return {
+      // Function validator
+      // Lets you implement a custom function used for validation
+      fn: function(value, attr, fn, model, computed) {
+        if(_.isString(fn)){
+          fn = model[fn];
+        }
+        return fn.call(model, value, attr, computed);
+      },
+
+      // Required validator
+      // Validates if the attribute is required or not
+      required: function(value, attr, required, model, computed) {
+        var isRequired = _.isFunction(required) ? required.call(model, value, attr, computed) : required;
+        if(!isRequired && !hasValue(value)) {
+          return false; // overrides all other validators
+        }
+        if (isRequired && !hasValue(value)) {
+          return this.format(defaultMessages.required, this.formatLabel(attr, model));
+        }
+      },
+
+      // Acceptance validator
+      // Validates that something has to be accepted, e.g. terms of use
+      // `true` or 'true' are valid
+      acceptance: function(value, attr, accept, model) {
+        if(value !== 'true' && (!_.isBoolean(value) || value === false)) {
+          return this.format(defaultMessages.acceptance, this.formatLabel(attr, model));
+        }
+      },
+
+      // Min validator
+      // Validates that the value has to be a number and equal to or greater than
+      // the min value specified
+      min: function(value, attr, minValue, model) {
+        if (!isNumber(value) || value < minValue) {
+          return this.format(defaultMessages.min, this.formatLabel(attr, model), minValue);
+        }
+      },
+
+      // Max validator
+      // Validates that the value has to be a number and equal to or less than
+      // the max value specified
+      max: function(value, attr, maxValue, model) {
+        if (!isNumber(value) || value > maxValue) {
+          return this.format(defaultMessages.max, this.formatLabel(attr, model), maxValue);
+        }
+      },
+
+      // Range validator
+      // Validates that the value has to be a number and equal to or between
+      // the two numbers specified
+      range: function(value, attr, range, model) {
+        if(!isNumber(value) || value < range[0] || value > range[1]) {
+          return this.format(defaultMessages.range, this.formatLabel(attr, model), range[0], range[1]);
+        }
+      },
+
+      // Length validator
+      // Validates that the value has to be a string with length equal to
+      // the length value specified
+      length: function(value, attr, length, model) {
+        if (!hasValue(value) || trim(value).length !== length) {
+          return this.format(defaultMessages.length, this.formatLabel(attr, model), length);
+        }
+      },
+
+      // Min length validator
+      // Validates that the value has to be a string with length equal to or greater than
+      // the min length value specified
+      minLength: function(value, attr, minLength, model) {
+        if (!hasValue(value) || trim(value).length < minLength) {
+          return this.format(defaultMessages.minLength, this.formatLabel(attr, model), minLength);
+        }
+      },
+
+      // Max length validator
+      // Validates that the value has to be a string with length equal to or less than
+      // the max length value specified
+      maxLength: function(value, attr, maxLength, model) {
+        if (!hasValue(value) || trim(value).length > maxLength) {
+          return this.format(defaultMessages.maxLength, this.formatLabel(attr, model), maxLength);
+        }
+      },
+
+      // Range length validator
+      // Validates that the value has to be a string and equal to or between
+      // the two numbers specified
+      rangeLength: function(value, attr, range, model) {
+        if(!hasValue(value) || trim(value).length < range[0] || trim(value).length > range[1]) {
+          return this.format(defaultMessages.rangeLength, this.formatLabel(attr, model), range[0], range[1]);
+        }
+      },
+
+      // One of validator
+      // Validates that the value has to be equal to one of the elements in
+      // the specified array. Case sensitive matching
+      oneOf: function(value, attr, values, model) {
+        if(!_.include(values, value)){
+          return this.format(defaultMessages.oneOf, this.formatLabel(attr, model), values.join(', '));
+        }
+      },
+
+      // Equal to validator
+      // Validates that the value has to be equal to the value of the attribute
+      // with the name specified
+      equalTo: function(value, attr, equalTo, model, computed) {
+        if(value !== computed[equalTo]) {
+          return this.format(defaultMessages.equalTo, this.formatLabel(attr, model), this.formatLabel(equalTo, model));
+        }
+      },
+
+      // Pattern validator
+      // Validates that the value has to match the pattern specified.
+      // Can be a regular expression or the name of one of the built in patterns
+      pattern: function(value, attr, pattern, model) {
+        if (!hasValue(value) || !value.toString().match(defaultPatterns[pattern] || pattern)) {
+          return this.format(defaultMessages.pattern, this.formatLabel(attr, model), pattern);
+        }
+      }
+    };
+  }());
+
+  return Validation;
+}(_));

UI/Mixins/AsValidatedView.js

@@ -0,0 +1,79 @@
+define(
+    [
+        'backbone.validation',
+        'underscore',
+        'jQuery/Validation'
+    ], function (Validation, _) {
+        'use strict';
+
+        return function () {
+
+            var originalOnRender = this.prototype.onRender;
+            var originalOnClose = this.prototype.onClose;
+            var originalBeforeClose = this.prototype.onBeforeClose;
+
+
+            this.prototype.onRender = function () {
+
+                Validation.bind(this);
+
+
+                if (!this.originalSync && this.model) {
+
+                    var self = this;
+                    this.originalSync = this.model.sync;
+
+
+                    var boundHandler = errorHandler.bind(this);
+
+                    this.model.sync = function () {
+                        self.$el.removeBootstrapError();
+                        return self.originalSync.apply(this, arguments).fail(boundHandler);
+                    };
+                }
+
+                if (this.model) {
+                    if (originalOnRender) {
+                        originalOnRender.call(this);
+                    }
+                }
+            };
+
+            this.prototype.onBeforeClose = function () {
+
+                if (this.model) {
+                    Validation.unbind(this);
+                }
+
+                if (originalBeforeClose) {
+                    originalBeforeClose.call(this);
+                }
+            };
+
+            this.prototype.onClose = function () {
+
+                if (this.model && this.model.isNew()) {
+                    this.model.destroy();
+                }
+
+                if (originalOnClose) {
+                    originalBeforeClose.call(this);
+                }
+            };
+
+
+            var errorHandler = function (response) {
+
+                if (response.status === 400) {
+
+                    var view = this;
+
+                    var validationErrors = JSON.parse(response.responseText);
+
+                    _.each(validationErrors, function (error) {
+                        view.$el.addBootstrapError(error);
+                    });
+                }
+            };
+        };
+    });

UI/Settings/Indexers/EditView.js

@@ -4,8 +4,9 @@ define(
     [
         'app',
         'marionette',
-        'Mixins/AsModelBoundView'
-    ], function (App, Marionette, AsModelBoundView) {
+        'Mixins/AsModelBoundView',
+        'Mixins/AsValidatedView'
+    ], function (App, Marionette, AsModelBoundView, AsValidatedView) {
 
         var view = Marionette.ItemView.extend({
             template: 'Settings/Indexers/EditTemplate',
@@ -53,5 +54,8 @@ define(
             }
         });
 
-        return AsModelBoundView.call(view);
+        AsModelBoundView.call(view);
+        AsValidatedView.call(view);
+
+        return view;
     });

UI/app.js

@@ -12,6 +12,7 @@ require.config({
         'bootstrap'           : 'JsLibraries/bootstrap',
         'backbone.deepmodel'  : 'JsLibraries/backbone.deep.model',
         'backbone.pageable'   : 'JsLibraries/backbone.pageable',
+        'backbone.validation' : 'JsLibraries/backbone.validation',
         'backbone.modelbinder': 'JsLibraries/backbone.modelbinder',
         'backgrid'            : 'JsLibraries/backbone.backgrid',
         'backgrid.paginator'  : 'JsLibraries/backbone.backgrid.paginator',
@@ -92,6 +93,14 @@ require.config({
                 ]
         },
 
+        'backbone.validation': {
+            deps   :
+                [
+                    'backbone'
+                ],
+            exports: 'Backbone.Validation'
+        },
+
         marionette: {
             deps:
                 [

UI/jQuery/Validation.js

@@ -0,0 +1,30 @@
+define(
+    [
+        'jquery'
+    ], function ($) {
+        'use strict';
+
+        $.fn.addBootstrapError = function (error) {
+            var input = this.find('[name]').filter(function () {
+                return this.name.toLowerCase() === error.propertyName.toLowerCase();
+            });
+
+            var controlGroup = input.parents('.control-group');
+            if (controlGroup.find('.help-inline').length === 0) {
+                controlGroup.find('.controls').append('<span class="help-inline error-message">' + error.errorMessage + '</span>');
+            }
+
+            controlGroup.addClass('error');
+
+            return controlGroup.find('.help-inline').text();
+        };
+
+
+        $.fn.removeBootstrapError = function () {
+
+            this.removeClass('error');
+
+            return this.parents('.control-group').find('.help-inline.error-message').remove();
+        };
+
+    });