adding

demo/demo.css

@@ -1 +1,160 @@
-/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}[hidden],template{display:none}
+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+html {
+  line-height: 1.15;
+  -webkit-text-size-adjust: 100%;
+}
+
+body {
+  margin: 0;
+}
+
+main {
+  display: block;
+}
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+hr {
+  box-sizing: content-box;
+  height: 0;
+  overflow: visible;
+}
+
+pre {
+  font-family: monospace, monospace;
+  font-size: 1em;
+}
+
+a {
+  background-color: transparent;
+}
+
+abbr[title] {
+  border-bottom: none;
+  text-decoration: underline;
+  -webkit-text-decoration: underline dotted;
+          text-decoration: underline dotted;
+}
+
+b, strong {
+  font-weight: bolder;
+}
+
+code, kbd, samp {
+  font-family: monospace, monospace;
+  font-size: 1em;
+}
+
+small {
+  font-size: 80%;
+}
+
+sub, sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+img {
+  border-style: none;
+}
+
+button, input, optgroup, select, textarea {
+  font-family: inherit;
+  font-size: 100%;
+  line-height: 1.15;
+  margin: 0;
+}
+
+button, input {
+  overflow: visible;
+}
+
+button, select {
+  text-transform: none;
+}
+
+[type=button], [type=reset], [type=submit], button {
+  -webkit-appearance: button;
+}
+
+[type=button]::-moz-focus-inner, [type=reset]::-moz-focus-inner, [type=submit]::-moz-focus-inner, button::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+[type=button]:-moz-focusring, [type=reset]:-moz-focusring, [type=submit]:-moz-focusring, button:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+fieldset {
+  padding: 0.35em 0.75em 0.625em;
+}
+
+legend {
+  box-sizing: border-box;
+  color: inherit;
+  display: table;
+  max-width: 100%;
+  padding: 0;
+  white-space: normal;
+}
+
+progress {
+  vertical-align: baseline;
+}
+
+textarea {
+  overflow: auto;
+}
+
+[type=checkbox], [type=radio] {
+  box-sizing: border-box;
+  padding: 0;
+}
+
+[type=number]::-webkit-inner-spin-button, [type=number]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+[type=search] {
+  -webkit-appearance: textfield;
+  outline-offset: -2px;
+}
+
+[type=search]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button;
+  font: inherit;
+}
+
+details {
+  display: block;
+}
+
+summary {
+  display: list-item;
+}
+
+template {
+  display: none;
+}
+
+[hidden] {
+  display: none;
+}

demo/index.html

@@ -7,7 +7,23 @@
     <link href="styles.css" rel="stylesheet" type="text/css">
 </head>
 <body>
-    <demo></demo>
+    <form class="form" novalidate>
+        <div class="field">
+            <label>
+                email
+                <input type="email" name="email" />
+            </label>
+            <field-error name="email"></field-error>
+        </div>
+        <div class="field">
+            <label>
+                password
+                <input type="password" name="password" />
+            </label>
+            <field-error name="password"></field-error>
+        </div>
+        <button type="submit">Send</button>
+    </form>
     <script type="text/javascript" src="demo.js"></script>
 </body>
 </html>

package.json

@@ -8,9 +8,6 @@
     },
     "author": "Björn Hase",
     "license": "MIT",
-    "dependencies": {
-        "riot": "^5.1.2"
-    },
     "dependencies": {
         "form-serialize": "^0.7.2",
         "riot": "^5.1.2",

src/FormValidator.js

@@ -0,0 +1,119 @@
+import validate from 'validate.js'
+import serialize from 'form-serialize'
+
+/**
+ *
+ *
+ *
+ */
+class FormValidator
+{
+    /**
+     *
+     *  @param {[type]} formSelector [description]
+     *  @param {[type]} constraits   [description]
+     */
+    constructor(formSelector, constraits)
+    {
+        this.errors = []
+
+        // getting selector to find form-element
+        this.formSelector = formSelector
+
+        // constraits for validate.js
+        this.constraits = constraits
+
+        // get form and elements
+        this.form = document.querySelector(this.formSelector)
+        this.elements = this.form.querySelectorAll('field-error')
+
+        // adding submit event
+        this.form.addEventListener('submit', (event) => {
+            this.onSubmit(event)
+        })
+
+        // adding event if a element is updated
+        this.form.addEventListener('field-update', (event) => {
+            this.onFieldUpdate(event)
+        })
+    }
+
+    /**
+     *
+     *  @param  {[type]} name [description]
+     *  @return {[type]}      [description]
+     */
+    findElementByName(name) {
+
+        let result
+
+        this.elements.forEach((element) => {
+            if (element.attributes.name.nodeValue == name) {
+                result = element
+                return false
+            }
+        })
+
+        return result
+    }
+
+    /**
+     *
+     *  @param  {[type]} event [description]
+     *  @return {[type]}       [description]
+     */
+    onSubmit(event) {
+        let errors = validate(serialize(event.target, {
+            hash: true
+        }), this.constraits)
+
+        if (errors) {
+            event.preventDefault()
+
+            this.elements.forEach((element) => {
+                let elementErrors = false
+
+                if (errors[element.attributes.name.nodeValue]) {
+                    elementErrors = errors[element.attributes.name.nodeValue]
+                }
+
+                this.dispatchCustomEvent(elementErrors, element)
+            })
+        }
+    }
+
+    /**
+     *
+     *  @param  {[type]} event [description]
+     *  @return {[type]}       [description]
+     */
+    onFieldUpdate(event) {
+        let errors = validate.single(event.detail.value, this.constraits[event.detail.name])
+        let element = this.findElementByName(event.detail.name)
+
+        this.dispatchCustomEvent(errors, element)
+    }
+
+    /**
+     *
+     *  @param  {[type]} errors  [description]
+     *  @param  {[type]} element [description]
+     *  @return {[type]}         [description]
+     */
+    dispatchCustomEvent(errors, element)
+    {
+        let detail = false
+
+        if (errors) {
+            detail = errors
+        }
+
+        const formValidationEvent = new CustomEvent('form-validation', {
+            'detail': detail
+        })
+
+        element.dispatchEvent(formValidationEvent)
+    }
+}
+
+export default FormValidator

src/demo/demo.js

@@ -1,11 +1,17 @@
 import * as riot from 'riot'
-import Demo from './demo.riot'
 
+import FormValidator from './../FormValidator'
 import FieldError from './../field-error.riot'
 
 riot.register('field-error', FieldError)
 riot.mount('field-error')
 
-// let it rain
-riot.register('demo', Demo)
-riot.mount('demo')
+const formValidation = new FormValidator('form', {
+    'email': {
+        'presence': true,
+        'email': true
+    },
+    'password': {
+        'presence': true
+    }
+})

src/field-error.riot

@@ -1,7 +1,9 @@
 <field-error>
     <div class="field__error" if={ state.errors.length > 0 }>
         <ul>
-            <li each={ error in state.errors }>{ error }</li>
+            <li each={ error in state.errors }>
+                { error }
+            </li>
         </ul>
     </div>
     <script>
@@ -9,7 +11,7 @@
         /**
          *  Shows errors of Validation
          *
-         *  <field-error key="name" errors={ errors }></field-error>
+         *  <field-error name="name" errors={ errors }></field-error>
          *
          */
 
@@ -18,24 +20,47 @@
             state: {
                 errors: [
 
-                ]
+                ],
             },
 
-            /**
-             *  check if errors from props has an error, if not reset errors in state
-             *
-             *  @param  {object} props
-             *  @param  {object} state
-             *
-             */
-            onBeforeUpdate(props, state) {
-                if (props.errors && props.errors.length > 0) {
-                    state.errors = props.errors
-                } else {
-                    state.errors = []
+            onMounted(props, state) {
+
+                const parent = this.root.closest('.field')
+                const element = document.querySelector('[name="' + props.name + '"]')
+                const form = element.closest('form')
+
+                // element and form set
+                if (element && form) {
+                    element.addEventListener('keyup', function(event) {
+
+                        const fieldUpdateEvent = new CustomEvent('field-update', {
+                            'detail': {
+                                'name': props.name,
+                                'value': this.value
+                            }
+                        })
+
+                        form.dispatchEvent(fieldUpdateEvent)
+                    })
                 }
-            }
 
+                // add custom event to listen to form-validation
+                this.root.addEventListener('form-validation', (event) => {
+
+                    // if detail is set with element name, get errors
+                    if (event.detail) {
+                        this.state.errors = event.detail
+                        parent.classList.add('field--error')
+                        parent.classList.remove('field--valid')
+                    } else {
+                        this.state.errors = []
+                        parent.classList.remove('field--error')
+                        parent.classList.add('field--valid')
+                    }
+
+                    this.update()
+                })
+            }
         }
 
     </script>