About

feedback.js it's simple library with beautiful API for validation and sending forms.

Why use feedback.js?

1. You don't need thinking about browser supporting, supports ie9+
2. You can sending data with files, if browser not supports FormData feedback.js sends form to iframe
3. Very simple API
4. Convenient validation
5. Your code becomes more understandable and takes up less space
6. Without dependencies

Installation

<script src="https://cdn.jsdelivr.net/gh/furashcka/[email protected]/dist/feedback.min.js"></script>

Install via NPM

npm i @furashcka/feedback.js

Install via Yarn

yarn add @furashcka/feedback.js

Quick start

<form method="post">
  <div class="error" style="display: none;"></div>

  <input type="text" name="name" placeholder="Your name" />
  <input type="text" name="email" placeholder="Your E-mail" />

  <button>Submit</button>
</form>

var feedback = new Feedback($("form").get(0));

// Validation initialization
feedback.schema({
  name: function () {
    if (this.isEmpty()) return "Please, write your name.";
  },
  email: function () {
    if (!this.isEmail()) return "Email is not correct!";
  },
});

// Error handling
feedback.validate({
  error: function (msg) {
    $("form .error").text(msg).show();
  },
  success: function () {
    $("form .error").hide();
  },
});

Options and Events

default options

var el = document.querySelector("form");
var opts = {
  focusIncorrectInput: true,
  fireSchemaByTurn: true,
  blockSubmitWhenFormSending: true,
  fireValidateAndAjaxWhenSubmit: true,
  resetFormAfterAjax: true,
  schema: {},
  validationStep: 0,
  validationStepChanged: function () {},
  ajax: {
    loadingClass: "--loading",
    url: el.action || location.href,
    method: el.method || "POST",
    iframePolyfill: "auto",
    iframePostMessage: false,
    iframeTimeout: 0,
    before: function () {},
    after: function () {},
    success: function () {},
    error: function () {},
    progress: function () {},
  },
  validate: {
    before: function () {},
    after: function () {},
    success: function () {},
    error: function () {},
  },
};

var feedback = new Feedback(el, opts);

focusIncorrectInput

true: set focus in incorrect input
false: nothing happens

Type: boolean
Default: true

fireSchemaByTurn

true: if you want to show the first error found and stop validating
false: if you want to show all errors at once

Type: boolean
Default: true

blockSubmitWhenFormSending

true: the next form sending is blocked while the previous one is sending
false: nothing happens, form send by default

Type: boolean
Default: true

fireValidateAndAjaxWhenSubmit

true: when form sending, checks all errors and send form by AJAX
false: nothing happens, form send by default

Type: boolean
Default: true

resetFormAfterAjax

true: calls form.reset(); after successful send
false: nothing happens

Type: boolean
Default: true

schema

{key: value} - object with all logics for validations inputs, key it's name attribute <input name="email"> or other form element, value it's function, calls when fires validate API.
Also you can use steps, when need step by step validation.
When you set step index, you need set "step-{number}"

var feedback = new Feedback(el, {
  schema: {
    email: function () {
      if (!this.isEmail()) return "Email is not correct!";
    },
  },
});

// with steps
var feedback = new Feedback(el, {
  schema: {
    "step-0": {
      name: function () {
        if (!this.isEmpty()) return "Please, enter your name.";
      },
    },
    "step-1": {
      email: function () {
        if (!this.isEmail()) return "Email is not correct!";
      },
    },
  },
});

// is recommended use API:
var feedback = new Feedback(el);
feedback.schema({
  email: function () {
    if (!this.isEmail()) return "Email is not correct!";
  },
});

// with steps
feedback.schema("step-0", {
  name: function () {
    if (!this.isEmpty()) return "Please, enter your name.";
  },
});

feedback.schema("step-1", {
  email: function () {
    if (!this.isEmail()) return "Email is not correct!";
  },
});

Input API this - it's array of inputs grouped by name with API from validator.js if need validate input without this context, call like: Instance.inputsGroupedByName.inputName.isEmpty()

get - returns input element by index; if index empty returns first element; if index -1 returns last element
isAnyChecked - returns true if any input checked, and return false if any not checked
forEach - method calls a function once for each element in an array inputs
equals - check if the string matches the comparison
isAlpha - check if the string contains only letters (a-zA-Z)
isAlphanumeric - check if the string contains only letters and numbers
isCreditCard - check if the string is a credit card
isEmail - check if the string is an email
isEmpty - check if the string has a length of zero
isFloat - check if the string is a float
isIn - check if the string is in a array of allowed values
isInt - check if the string is an integer
isMobilePhone - check if the string is a mobile phone number
isNumeric - check if the string contains only numbers
isURL - check if the string is an URL
matches - check if string matches the pattern

read more about each can be here

Type: Object
Default: empty object

validationStep

needs for step by step validation

Type: number
Default: 0

validationStepChanged

calls after validationStep changes

Type: function
Default: empty function

ajax

object for setting AJAX options:

var feedback = new Feedback(el, {
  ajax: {
    url: "//httpbin.org/post",
    method: "post",
  },
});

// is recommended use API:
var feedback = new Feedback(el);
feedback.ajax({
  url: "//httpbin.org/post",
  method: "post",
});

Type: object
Default: object

ajax.loadingClass

adds class to form element when sends data

Type: string
Default: --loading

ajax.url

URL address to which the request is sent

Type: string
Default: action attribute from form element or location.href (if empty action attribute)

ajax.method

HTTP request method: GET | POST | PUT | PATCH | DELETE

Type: string
Default: method attribute from form element or 'POST' (if empty method attribute)

ajax.iframePolyfill

auto: 1) browser supports XMLHttpRequest v2.0, feedback.js sends files and strings together, 2) browser supports only XMLHttpRequest v1.0, feedback.js sends only strings, XMLHttpRequest v1.0 will be uses if form element don't have any inputs with type=file 3) need send files and strings together, but browser don't support XMLHttpRequest v2.0, feedback.js sends to iframe and show warning to console
true: feedback.js sends strings and files always to iframe
false: uses XMLHttpRequest v2.0 or XMLHttpRequest v1.0, if browser not support XMLHttpRequest v2.0 and form element have any inputs with type=file, feedback.js sends only strings and show warning to console

Type: string or boolean
Default: auto

ajax.iframePostMessage

true: waits until call Window.postMessage() from iframe for response from server and after call ajax.success
false: nothing happens

Type: boolean
Default: false

ajax.iframeTimeout

1000 (or more): waits 1000 (or more) milliseconds for iframe.load event, if iframe.load event not called until 1000 (or more) milliseconds, calls ajax.error
0: waits endlessly

Type: number
Default: 0

ajax.before

calls before sending by AJAX

Type: function
Default: empty function

ajax.after

calls after sending by AJAX

Type: function
Default: empty function

ajax.success

calls if the request succeeds, arguments: type (String) - 'ajax.2.0 or ajax.1.0 or iframe'; xhr (XMLHttpRequest object)

feedback.ajax({
  success: function (type, xhr) {
    switch (type) {
      case "ajax.1.0":
        console.log("1.0", xhr);
        break;
      case "ajax.2.0":
        console.log("2.0", xhr);
        break;
      case "iframe":
        console.log("iframe", xhr);
        break;
    }
  },
});

Type: function
Default: empty function

ajax.error

calls if the request fails, arguments: type (String) - 'ajax.2.0 or ajax.1.0'; xhr (XMLHttpRequest object), not calls if uses iframe

feedback.ajax({
  error: function (type, xhr) {
    switch (type) {
      case "ajax.1.0":
        console.log("1.0", xhr);
        break;
      case "ajax.2.0":
        console.log("2.0", xhr);
        break;
    }
  },
});

Type: function
Default: empty function

ajax.progress

calls periodically with information when an XMLHttpRequest before success completely, this in function it's form element, arguments: percent (Number)

feedback.ajax({
  progress: function (percent) {
    console.log("progress - " + percent + "%");
  },
});

Type: function
Default: empty function

validate

object with validation events:

var feedback = new Feedback(el, {
  validate: {
    error: function (err, inputsArray) {},
  },
});

// is recommended use API:
var feedback = new Feedback(el);
feedback.validate({
  error: function (err, inputsArray) {},
});

Type: object
Default: object

validate.before

calls before validating

Type: function
Default: empty function

validate.after

calls after validating

Type: function
Default: empty function

validate.success

calls, if validation successful

Type: function
Default: empty function

validate.error

calls, if validation has errors, arguments: errorMessage (String); inputsArr (Array) - inputs grouped by name

feedback.validate({
  error: function (errorMessage, inputsArr) {
    var err = "<p>" + errorMessage + "</p>";
    var el = inputsArr[0];

    el.insertAdjacentHTML("beforebegin", err);
    // or with jQuery
    $(el).before(err);
  },
});

Type: function
Default: empty function

API

// you can do:
feedback.schema(/* ... */).validate(/* ... */).ajax(/* ... */);
/* ... other API */

// or

feedback.schema(/* ... */);
feedback.validate(/* ... */);
feedback.ajax(/* ... */);

schema

function for updating options.schema

feedback.schema({
  /* ... */
});

// with steps
feedback.schema("step-0", {
  /* ... */
});

feedback.schema("step-1", {
  /* ... */
});

step

function for updating options.validationStep; and options.validationStepChanged;
get return current step;
set, next, prev update current step;
changed init change event.

feedback.step("get"); // return options.validationStep
feedback.step("set", 1); // options.validationStep = 1;
feedback.step("next"); // options.validationStep++;
feedback.step("prev"); // options.validationStep--;
feedback.step("changed", function () {}); // options.validationStepChanged = function () {};

ajax

function for updating options.ajax and sending
updating:

feedback.ajax({
  /* ... */
});

sending form:

feedback.ajax();

sending selected inputs:

feedback.ajax(["name", "age"]);

validate

function for updating options.validate and validating; returns boolean
updating:

feedback.validate({
  /* ... */
});

validating:

if (feedback.validate() === true) {
  /* ... */
}

update

if your form is dynamical you need call update when your form changed

feedback.update();

fireValidateError

call validate.error event

var el = form.querySelector('input[name="email"]');
feedback.fireValidateError("Error: wrong email!", [el]);

resetForm

reset form by default

feedback.resetForm();

destroy

remove all events and return null for clearing variable

feedback = feedback.destroy();
console.log(feedback); // null

Examples

BASIC PRELOADER PROGRESS STEPS