ActiveForm replacement. Automatically generates knockoutjs viewmodels from yii ActiveRecords. Allows computed fields and nested forms.

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1.2.0 2019-05-02 23:23 UTC

This package is auto-updated.

Last update: 2021-10-31 00:31:54 UTC


This extension provides a replacement for ActiveForm. A KnockoutJS viewmodel is automatically generated (using knockout mapping lib), which serves a starting point for your customization, e.g. computed observables. Moreover you get some more input types, like "decimal", "percent", "date" and "datetime", which display the raw data in the user's locale format and store the data in ISO-format.


The preferred way to install this extension is through composer.

Either run

php composer.phar require --prefer-dist e-frank/yii2-knockout "*"

or add

"e-frank/yii2-knockout": "*"

to the require section of your composer.json file.


example code for a view. note that you would place model load and validation code in your controller/action.

use x1\knockout\ActiveForm;

$this->title  = 'Programmatic Viewmodel Generation';
// init data from default or post
$post = Yii::$app->request->post();
$data = empty($post) ? [
	'title' => '', 
	'value' => 1234.56, 
	'date'  => sprintf('%s%d:00', date('Y-m-d H:'), date('i') - (date('i') % 15))
	] : $post['DynamicModel'] ;

// create a dynamic model, for demonstration purpose
$model = new yii\base\DynamicModel($data);
$model->addRule(['title'], 'string', ['max' => 128]);
$model->addRule(['title'], 'required');
$model->addRule(['value'], 'number', ['min' => 0]);

// validate, usually done in controller
if (!empty($post)) {

// show what we have got
	'attributes' => $model->attributes,
	'errors'     => $model->getErrors(),
	'post'       => $post,


<?php $form = ActiveForm::begin(['errors' => $model->getErrors(), 'defaults' => ['decimals' => 3]]); ?>
<div class="panel panel-default">
    <div class="panel-heading"><?= $this->title ?></div>
    <div class="panel-body">
		<?= $form->field($model, 'title') ?>
		<?php #= $form->field($model, 'value')->decimal(['decimal' => ['thousandsSeparator' => ' ']]) ?>
		<?= $form->field($model, 'value')->decimal() ?>
		computed raw data: <code data-bind="text: comp" class="text-right"></code>
		computed user's display format: <code data-bind="text: comp.display" class="text-right"></code>
		<hr />
		<?= $form->field($model, 'date')->datetime() ?>
		<code data-bind="text: JSON.stringify(ko.mapping.toJS($data))"></code>

	<div class="panel-footer">
		<div class="text-right">
			<button data-bind="click: validate" class="btn btn-info">
			<button data-bind="
				text:   hasError() ? 'HAS ERRORS' : 'IS VALID: Submit', 
				css:    {'btn-primary': !hasError(), 'btn-danger': hasError()},
				enable: !hasError()"
<?php ActiveForm::end() ?>

custom viewModel enhancements, located at the end of your view, after all other scripts are loaded:

mapping.viewModel = function(self) {
	console.log(self, x1);
    self.comp = ko.pureComputed(function() {
    	return self.value() * 1.2;

    // must return self
    return self;

the demo page should look like this: