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User Contributed Rules
Nick Evans edited this page Mar 4, 2019
·
47 revisions
ko.validation.rules['exampleRule'] = {
validator: function(val, otherVal){
/* awesome logic */
},
message: 'Sorry Chief, {0} this is not Valid'
};Notice it is also possible to have "anonymous" rules.
ko.observable(15).extend({
validation: [{
validator: function(value, params) {
return parseInt(value, 10) === params;
},
message: function(params) {
return 'Value must be equal to ' + params;
},
params: 1
}]
})ko.validation.rules["validateDate"] = {
validator: function (val, validate) {
var mindate = moment.utc(new Date("0001-01-01"));
// Ensure the date is not mindate
return moment.utc(val).isAfter(mindate);
},
message: "Please enter a valid date"
};/*
* This rules checks the given array of objects/observables and returns
* true if at least one of the elements validates agains the the default
* 'required' rules
*
* Example:
*
*
* self.mobilePhone.extend({ requiresOneOf: [self.homePhone, self.mobilePhone] });
* self.homePhone.extend({ requiresOneOf: [self.homePhone, self.mobilePhone] });
*
*/
ko.validation.rules['requiresOneOf'] = {
getValue: function (o) {
return (typeof o === 'function' ? o() : o);
},
validator: function (val, fields) {
var self = this;
var anyOne = ko.utils.arrayFirst(fields, function (field) {
var stringTrimRegEx = /^\s+|\s+$/g,
testVal;
var val = self.getValue(field);
if (val === undefined || val === null)
return !required;
testVal = val;
if (typeof (val) == "string") {
testVal = val.replace(stringTrimRegEx, '');
}
return ((testVal + '').length > 0);
});
return (anyOne != null);
},
message: 'One of these fields is required'
};/**
* Limits the maximum amount a numeric value can be changed.
* Parameters: maxChange: <The max valid value change from base value>,
* baseValueAccessor: <A function to access the base value>
*
* Example: 'Distance can change a maximum of 10'
* var initDistance = 5;
* this.distance.extend({
* changeLimit:{
* maxChange:10,
* baseValueAccessor:function () {
* return initDistance;
* }
* }
* });
*
*/
ko.validation.rules['changeLimit'] = {
validator: function(val, options) {
return Math.abs(val - options.baseValueAccessor()) <= options.maxChange;
},
message: 'Change limit exeeded'
};/*
* Aggregate validation of all the validated properties within an object
* Parameter: true|false
* Example:
*
* viewModel = {
* person: ko.observable({
* name: ko.observable().extend({ required: true }),
* age: ko.observable().extend({ min: 0, max: 120 })
* }.extend({ validObject: true })
* }
*/
ko.validation.rules["validObject"] = {
validator: function (obj, bool) {
if (!obj || typeof obj !== "object") {
throw "[validObject] Parameter must be an object";
}
return bool === (ko.validation.group(obj)().length === 0);
},
message: "Every property of the object must validate to '{0}'"
};/*
* Aggregate validation of all the validated elements within an array
* Parameter: true|false
* Example
*
* viewModel = {
* person: ko.observableArray([{
* name: ko.observable().extend({ required: true }),
* age: ko.observable().extend({ min: 0, max: 120 })
* }, {
* name: ko.observable().extend({ required: true }),
* age: ko.observable().extend({ min:0, max:120 })
* }].extend({ validArray: true })
* }
*/
ko.validation.rules["validArray"] = {
validator: function (arr, bool) {
if (!arr || typeof arr !== "object" || !(arr instanceof Array)) {
throw "[validArray] Parameter must be an array";
}
return bool === (arr.filter(function (element) {
return ko.validation.group(ko.utils.unwrapObservable(element))().length !== 0;
}).length === 0);
},
message: "Every element in the array must validate to '{0}'"
};ko.validation.rules['htmlNotEmpty'] = {
validator: function (val, otherVal) {
function isBlank(str) {
return (!str || !str.match(/\S/));
}
function isEmpty(str) {
return (!str || 0 === str.length);
}
function isHtmlEmpty(str) {
if (!str.match(/^\s*?\\</)) return false;
var s = $(str).text();
return (isEmpty(s) || isBlank(s));
}
var invalid = isEmpty(val);
if (!invalid) invalid = isHtmlEmpty(val);
return !invalid;
},
message: 'Invalid. Please enter a value'
};ko.validation.rules['nullableInt'] = {
validator: function (val, validate) {
return val === null || val === "" || (validate && /^-?\d*$/.test(val.toString()));
},
message: 'Must be empty or an integer value'
};ko.validation.rules['nullableDecimal'] = {
validator: function (val, validate) {
return val === null || val === "" || (validate && /^-?\d*(?:\.\d*)?$/.test(val.toString()));
},
message: 'Must be empty or a decimal value'
};/*
* Determines if a field is required or not based on a function or value
* Parameter: boolean function, or boolean value
* Example
*
* viewModel = {
* var vm = this;
* vm.isRequired = ko.observable(false);
* vm.requiredField = ko.observable().extend({ conditional_required: vm.isRequired});
* }
*/
ko.validation.rules['conditional_required'] = {
validator: function (val, condition) {
var required = false;
if (typeof condition == 'function') {
required = condition();
}
else {
required = condition;
}
if (required) {
return !(val == undefined || val == null || val.length == 0);
}
else {
return true;
}
},
message: ko.validation.rules.required.message
}//This rules checks the credit card details
//The card number (inferred) as well as the card type (via the card type field) are required
//This checks the length and starting digits of the card per the type
//It also checks the checksum (see http://en.wikipedia.org/wiki/Luhn_algorithm)
//The card type field must return 'vc' for visa, 'mc' for mastercard, 'ae' for amex
//This is based on code from here: http://www.rahulsingla.com/blog/2011/08/javascript-implementing-mod-10-validation-(luhn-formula)-for-credit-card-numbers
//Example:
//
//self.cardNumber.extend({ creditCard: self.cardType });
ko.validation.rules['creditCard'] = {
getValue: function (o) {
return (typeof o === 'function' ? o() : o);
},
validator: function (val, cardTypeField) {
var self = this;
var cctype = self.getValue(cardTypeField);
if (!cctype) return false;
cctype = cctype.toLowerCase();
if (val.length < 15) {
return (false);
}
var match = cctype.match(/[a-zA-Z]{2}/);
if (!match) {
return (false);
}
var number = val;
match = number.match(/[^0-9]/);
if (match) {
return (false);
}
var fnMod10 = function (number) {
var doubled = [];
for (var i = number.length - 2; i >= 0; i = i - 2) {
doubled.push(2 * number[i]);
}
var total = 0;
for (var i = ((number.length % 2) == 0 ? 1 : 0) ; i < number.length; i = i + 2) {
total += parseInt(number[i]);
}
for (var i = 0; i < doubled.length; i++) {
var num = doubled[i];
var digit;
while (num != 0) {
digit = num % 10;
num = parseInt(num / 10);
total += digit;
}
}
if (total % 10 == 0) {
return (true);
} else {
return (false);
}
}
switch (cctype) {
case 'vc':
case 'mc':
case 'ae':
//Mod 10 check
if (!fnMod10(number)) {
return false;
}
break;
}
switch (cctype) {
case 'vc':
if (number[0] != '4' || (number.length != 13 && number.length != 16)) {
return false;
}
break;
case 'mc':
if (number[0] != '5' || (number.length != 16)) {
return false;
}
break;
case 'ae':
if (number[0] != '3' || (number.length != 15)) {
return false;
}
break;
default:
return false;
}
return (true);
},
message: 'Card number not valid.'
};/*
* Ensures a field has the same value as another field (E.g. "Confirm Password" same as "Password"
* Parameter: otherField: the field to compare to
* Example
*
* viewModel = {
* var vm = this;
* vm.password = ko.observable();
* vm.confirmPassword = ko.observable();
* }
* viewModel.confirmPassword.extend( areSame: { params: viewModel.password, message: "Confirm password must match password" });
*/
ko.validation.rules['areSame'] = {
getValue: function (o) {
return (typeof o === 'function' ? o() : o);
},
validator: function (val, otherField) {
return val === this.getValue(otherField);
},
message: 'The fields must have the same value'
};/*
* Ensures a field matches a regex rule - in this case a password field has some complexity
*/
ko.validation.rules['passwordComplexity'] = {
validator: function (val) {
return /(?=^[^\s]{6,128}$)((?=.*?\d)(?=.*?[A-Z])(?=.*?[a-z])|(?=.*?\d)(?=.*?[^\w\d\s])(?=.*?[a-z])|(?=.*?[^\w\d\s])(?=.*?[A-Z])(?=.*?[a-z])|(?=.*?\d)(?=.*?[A-Z])(?=.*?[^\w\d\s]))^.*/.test('' + val + '');
},
message: 'Password must be between 6 and 128 characters long and contain three of the following 4 items: upper case letter, lower case letter, a symbol, a number'
};// ensure a property of all items is unique
ko.validation.rules['arrayItemsPropertyValueUnique'] = {
validator: function (array, arrayItemPropertyName) {
if (!array || typeof array !== "object" || !(array instanceof Array)) {
throw "[arrayItemsPropertyValueUnique] Parameter must be an array";
}
//console.log('arrayItemsPropertyValueUnique', array, arrayItemPropertyName);
var values = [];
for (var index = 0; index < array.length; index++) {
var prop = array[index][arrayItemPropertyName];
var value = prop();
if (values.indexOf(value) != -1) {
console.warn("The items in the array do not have a unique value for property '"
+ arrayItemPropertyName + "'.", array);
return false;
} else {
values.push(value);
}
}
return true;
},
message: "The items in the array do not have a unique value for property '{0}'."
};// works like the SQL unique constraint - only 1 combination of fields is allowed
// similar to customvalidator above, but takes an array of multiple arguments if required
// rather than being limited to a single property.
// it is strongly recommended you change the error message from default is using more than 1
// property, as only the first property name will be displayed using the default message.
//
// Note uses Array.isArray - recomend polyfill at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
//
// usage: self.datagridItems.extend({
// uniqueConstraint:
// {
// params: ["ItemName", "ItemSubcategoryDescription"],
// message: "2 or more rows have the same value for both 'Item' and 'Type'"
// }
// });
//
ko.validation.rules['uniqueConstraint'] = {
validator: function (arr, itemPropertyNames) {
if (!Array.isArray(arr)) {
throw new TypeError("[uniqueConstraint] must extend an observableArray");
}
if (!Array.isArray(itemPropertyNames)) {
itemPropertyNames = [itemPropertyNames];
}
var vals = [], v, stringJoinHash = '`\r', i = 0,
mapToValues = function (pName) {
return ko.unwrap(arr[i][pName]);
};
for (; i < arr.length; i++) {
v = ko.utils.arrayMap(itemPropertyNames, mapToValues).join(stringJoinHash);
if (ko.utils.arrayIndexOf(vals, v) != -1) {
return false;
} else {
vals.push(v);
}
}
return true;
},
message: "2 or more '{0}' items do not have a unique value."
};ko.validation.rules['multiemail'] = {
validator: function (val, validate) {
if (!validate) { return true; }
var isValid = true;
if (!ko.validation.utils.isEmptyVal(val)) {
// use the required: true property if you don't want to accept empty values
var values = val.split(';');
$(values).each(function (index) {
isValid = ko.validation.rules['email'].validator($.trim(this), validate);
return isValid; // short circuit each loop if invalid
});
}
return isValid;
},
message: 'Please enter valid email addresses (separate multiple email addresses using a semicolon).'
};/* Validates that all values in an array are unique.
To initialize the simple validator provide an array to compare against.
By default this will simply compare do an exactly equal (===) operation against each element in the supplied array.
For a little more control, initialize the validator with an object instead. The object should contain two properties: array and predicate.
The predicate option enables you to provide a function to define equality. The array option can be observable.
Note: This is similar to the 'arrayItemsPropertyValueUnique' rule but I find it to be more flexible/functional.
SIMPLE EXAMPLE::
model.thisProp.extend({ isUnique: model.thoseProps });
COMPLEX EXAMPLE::
model.selectedOption.extend({ isUnique: {
params: {
array: model.options,
predicate: function (opt, selectedVal) {
return ko.utils.unwrapObservable(opt.id) === selectedVal;
}
}
}});
*/
ko.validation.rules['isUnique'] = {
validator: function (newVal, options) {
if (options.predicate && typeof options.predicate !== "function")
throw new Error("Invalid option for isUnique validator. The 'predicate' option must be a function.");
var array = options.array || options;
var count = 0;
ko.utils.arrayMap(ko.utils.unwrapObservable(array), function(existingVal) {
if (equalityDelegate()(existingVal, newVal)) count++;
});
return count < 2;
function equalityDelegate() {
return options.predicate ? options.predicate : function(v1, v2) { return v1 === v2; };
}
},
message: 'This value is a duplicate',
};/* Validates a date for a given culture, using jQuery UI Datepicker utility functions.
Of course, the jQuery UI Datepicker widget must be loaded, along with the globalization settings
(ex: jquery-ui-i18n.fr.js) for the culture(s) being used.
EXAMPLE::
model.thisProp.extend({ localizedDate: 'fr' });
*/
ko.validation.rules['localizedDate'] = {
validator: function (value, culture) {
if (ko.validation.utils.isEmptyVal(value) || !culture) return true;
var settings = $.datepicker.regional[culture];
try {
$.datepicker.parseDate(settings.dateFormat, value, settings);
return true;
} catch (e) {
return false;
}
},
message: 'Please enter a proper date'
};ko.validation.rules['json'] = {
validator: function(value, validate) {
// http://stackoverflow.com/a/20392392
if (!validate) { return true; }
try {
var o = JSON.parse(value);
return (o && typeof o === "object" && o !== null);
}
catch (e) { }
return false;
},
message: 'The field must be a valid JSON'
}; /*
* Checks that all the values in the current array exists in an array.
* Default compare if predicate is not supplied is ===
* Parameter: array or {array: <array>, predicate: <function>}
* Example
*
* viewModel.people = ['peter']
* viewModel.managers: ko.observableArray(['peter', 'anna'].extend({ existsIn: viewModel.people })
* OR
* viewModel.people = [{name:'peter'}]
* viewModel.managers: ko.observableArray(['peter', 'anna'].extend({ existsIn: {
* array: viewModel.people,
* predicate: function(existingVal, newVal){return existingVal.name == newVal.name; }
* }})
*/
ko.validation.rules["existsIn"] = {
validator: function (newVal, options) {
if (options.predicate && typeof options.predicate !== "function")
throw new Error("Invalid option for existsIn validator. The 'predicate' option must be a function.");
if (newVal.length == 0) return true;
var array = options.array || options;
var pred = options.predicate ? options.predicate : function (v1, v2) { return v1 === v2; };
return null != ko.utils.arrayFirst(newVal, function (target) {
return null != ko.utils.arrayFirst(ko.unwrap(array), function (existingVal) {
return pred(existingVal, target);
});
});
},
message: "A value does not exist in target array"
};If having a complex data structure, the use of ko.validation.group with the deep:true can often be a major pain. On the other hand, the complex data structure probably also includes arrays and objects that needs to be validated.
Note: This is an extender, not a validation rule.
//must be in its own extend call, AFTER at least 1 validation has been added
ko.extenders.syncModified = function(target) {
target.isModified.subscribe(function (val) {
var obj = ko.unwrap(target);
if (obj instanceof Array)
ko.utils.arrayForEach(obj, function(t) {
if (t.isModified)
t.isModified(val);
else
ko.utils.objectForEach(t, function(_, t2) {
t2.isModified && t2.isModified(val);
});
});
else
ko.utils.objectForEach(obj, function(_, t) {
t.isModified && t.isModified(val);
});
});
return target;
};Example:
function ComplexObject(){
var self = this;
...
self.somearray = ko.observableArray([someOtherObservableWithValidation]);
self.somearray
.extend({ validArray: true }) //first a validation
.extend({ syncModified: true }); //then sync in own block, so it can depend on modified existing
...
self.errors = ko.validation.group(self, { observable: true, live: true });
self.isValid = ko.computed(function () { return self.errors().length === 0; });
}
function Save(){
cmplx.errors.showAllMessages(); //FORCE validation
if (!cmplx.isValid()) return false;
actual_save();
cmplx.errors.showAllMessages(false); //FORCE NEW validation
return true;
}
var cmplx = new ComplexObject();
Save(cmplx);Note: This is for use with the standard html datepicker due to date format restrictions where val is a date in the format 'yyyy-MM-DD'
ko.validation.rules['minAge'] = {
validator: function (val, otherVal) {
var yyyyMMDD = val.split('-');
var today = new Date();
var then = new Date(yyyyMMDD[0], yyyyMMDD[1] - 1, yyyyMMDD[2]);
var yearDiff = today.getYear() - then.getYear();
var monthDiff = today.getMonth() - then.getMonth();
var dayDiff = today.getDate() - then.getDate();
if (yearDiff < otherVal)
return false;
if (yearDiff > otherVal)
return true;
if (monthDiff < 0)
return false;
if (monthDiff > 0)
return true;
if (dayDiff < 0)
return false;
return true;
},
message: 'You must be at least {0} years of age.'
};/*
* This rule checks in the given value is a valid NPI (National Provider Identifier) number.
* Validation taken from http://jsfiddle.net/alexdresko/cLNB6/
*
* Example:
*
* <input type="text" data-bind="value: myNpiObservable.extend({ isNpiValid: true })" />
* Live Example: https://jsfiddle.net/ckkbs9wg/
*
*/
ko.validation.rules['isNpiValid'] = {
validator: function(npi, bool) {
var length, counter, tmp, sum;
if (!npi)
return false;
length = npi.length;
counter = 0;
if ((length === 15) && (npi.indexOf("80840", 0, 5) === 0))
sum = 0;
else if (length === 10)
sum = 24;
else
return false;
while (length !== 0) {
tmp = npi.charCodeAt(length - 1) - '0'.charCodeAt(0);
if ((counter++ % 2) !== 0) {
if ((tmp <<= 1) > 9) {
tmp -= 10;
tmp++;
}
}
sum += tmp;
length--;
}
return ((sum % 10) === 0);
},
message: 'Invalid NPI Number'
};/*
* This rule check if the given value is a valid IP Address
* Example:
* <input type="text" data-bind="value: myIpObservable.extend({ ipAddress: true })" />
*/
ko.validation.rules['ipAddress'] = {
validator: function (val) {
return /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test('' + val + '');
},
message: 'Please insert a valid ip address'
};/*
* This rule check if the given value is a valid URL
* Example:
* <input type="text" data-bind="value: myUrlObservable.extend({ url: true })" />
*/
ko.validation.rules['url'] = {
validator: function (val) {
return /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/.test('' + val + '');
},
message: 'Please use a valid URL starting with http:// or https://'
};