jdanyow/app.html

## app.html
<template>
  <form submit.delegate="submit()">
    <!--<ul><li repeat.for="error of controller.errors">${error.message}</li></ul>-->

    <div class="form-group">
      <label class="control-label" for="first">First Name</label>
      <input type="text" class="form-control" id="first" placeholder="First Name"
             value.bind="firstName & validate">
    </div>

    <div class="form-group">
      <label class="control-label" for="last">Last Name</label>
      <input type="text" class="form-control" id="last" placeholder="Last Name"
             value.bind="lastName & validate">
    </div>

    <div class="form-group">
      <label class="control-label" for="email">Email</label>
      <input type="email" class="form-control" id="email" placeholder="Email"
             value.bind="email & validate">
    </div>

    <button type="submit" class="btn btn-primary">Submit</button>
  </form>
</template>

## app.js
import {inject} from 'aurelia-dependency-injection';
import {
  ValidationControllerFactory,
  ValidationController,
  ValidationRules
} from 'aurelia-validation';
import {BootstrapFormRenderer} from './bootstrap-form-renderer';

@inject(ValidationControllerFactory)
export class App {
  firstName = '';
  lastName = '';
  email = '';
  controller = null;

  constructor(controllerFactory) {
    this.controller = controllerFactory.createForCurrentScope();
    this.controller.addRenderer(new BootstrapFormRenderer());
  }

  submit() {
    this.controller.validate();
  }
}

ValidationRules
  .ensure(a => a.firstName).required()
  .ensure(a => a.lastName).required()
  .ensure(a => a.email).required().email()
  .on(App);

## bootstrap-form-renderer.js
import {
  ValidationRenderer,
  RenderInstruction,
  ValidationError
} from 'aurelia-validation';

export class BootstrapFormRenderer {
  render(instruction) {
    for (let { error, elements } of instruction.unrender) {
      for (let element of elements) {
        this.remove(element, error);
      }
    }

    for (let { error, elements } of instruction.render) {
      for (let element of elements) {
        this.add(element, error);
      }
    }
  }

  add(element, error) {
    const formGroup = element.closest('.form-group');
    if (!formGroup) {
      return;
    }

    // add the has-error class to the enclosing form-group div
    formGroup.classList.add('has-error');

    // add help-block
    const message = document.createElement('span');
    message.className = 'help-block validation-message';
    message.textContent = error.message;
    message.id = `validation-message-${error.id}`;
    formGroup.appendChild(message);
  }

  remove(element, error) {
    const formGroup = element.closest('.form-group');
    if (!formGroup) {
      return;
    }

    // remove help-block
    const message = formGroup.querySelector(`#validation-message-${error.id}`);
    if (message) {
      formGroup.removeChild(message);

      // remove the has-error class from the enclosing form-group div
      if (formGroup.querySelectorAll('.help-block.validation-message').length === 0) {
        formGroup.classList.remove('has-error');
      }
    }
  }
}

## index.html
<!doctype html>
<html>
  <head>
    <title>Aurelia</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
  </head>
  <body aurelia-app="main" class="container">
    <h1>Loading...</h1>

    <script src="https://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/config.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script>
    <script>
      require(['aurelia-bootstrapper']);
    </script>
  </body>
</html>

## main.js
export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging()
    .plugin('aurelia-validation');

  aurelia.start().then(() => aurelia.setRoot());
}
	<template>
	<form submit.delegate="submit()">
	<!--<ul><li repeat.for="error of controller.errors">${error.message}</li></ul>-->

	<div class="form-group">
	<label class="control-label" for="first">First Name</label>
	<input type="text" class="form-control" id="first" placeholder="First Name"
	value.bind="firstName & validate">
	</div>

	<div class="form-group">
	<label class="control-label" for="last">Last Name</label>
	<input type="text" class="form-control" id="last" placeholder="Last Name"
	value.bind="lastName & validate">
	</div>

	<div class="form-group">
	<label class="control-label" for="email">Email</label>
	<input type="email" class="form-control" id="email" placeholder="Email"
	value.bind="email & validate">
	</div>

	<button type="submit" class="btn btn-primary">Submit</button>
	</form>
	</template>
	import {inject} from 'aurelia-dependency-injection';
	import {
	ValidationControllerFactory,
	ValidationController,
	ValidationRules
	} from 'aurelia-validation';
	import {BootstrapFormRenderer} from './bootstrap-form-renderer';

	@inject(ValidationControllerFactory)
	export class App {
	firstName = '';
	lastName = '';
	email = '';
	controller = null;

	constructor(controllerFactory) {
	this.controller = controllerFactory.createForCurrentScope();
	this.controller.addRenderer(new BootstrapFormRenderer());
	}

	submit() {
	this.controller.validate();
	}
	}

	ValidationRules
	.ensure(a => a.firstName).required()
	.ensure(a => a.lastName).required()
	.ensure(a => a.email).required().email()
	.on(App);
	import {
	ValidationRenderer,
	RenderInstruction,
	ValidationError
	} from 'aurelia-validation';

	export class BootstrapFormRenderer {
	render(instruction) {
	for (let { error, elements } of instruction.unrender) {
	for (let element of elements) {
	this.remove(element, error);
	}
	}

	for (let { error, elements } of instruction.render) {
	for (let element of elements) {
	this.add(element, error);
	}
	}
	}

	add(element, error) {
	const formGroup = element.closest('.form-group');
	if (!formGroup) {
	return;
	}

	// add the has-error class to the enclosing form-group div
	formGroup.classList.add('has-error');

	// add help-block
	const message = document.createElement('span');
	message.className = 'help-block validation-message';
	message.textContent = error.message;
	message.id = `validation-message-${error.id}`;
	formGroup.appendChild(message);
	}

	remove(element, error) {
	const formGroup = element.closest('.form-group');
	if (!formGroup) {
	return;
	}

	// remove help-block
	const message = formGroup.querySelector(`#validation-message-${error.id}`);
	if (message) {
	formGroup.removeChild(message);

	// remove the has-error class from the enclosing form-group div
	if (formGroup.querySelectorAll('.help-block.validation-message').length === 0) {
	formGroup.classList.remove('has-error');
	}
	}
	}
	}
	<!doctype html>
	<html>
	<head>
	<title>Aurelia</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
	</head>
	<body aurelia-app="main" class="container">
	<h1>Loading...</h1>

	<script src="https://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/config.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script>
	<script>
	require(['aurelia-bootstrapper']);
	</script>
	</body>
	</html>
	export function configure(aurelia) {
	aurelia.use
	.standardConfiguration()
	.developmentLogging()
	.plugin('aurelia-validation');

	aurelia.start().then(() => aurelia.setRoot());
	}