yii2-dynamicform
===================
It is widget to yii2 framework to clone form elements in a nested manner, maintaining accessibility.
![yii2-dynamicform](http://wbraganca.com/img/yii2-dynamicform-2.0.0.jpg)

Installation
------------

The preferred way to install this extension is through [composer](http://getcomposer.org/download/).

Either run

```
php composer.phar require --prefer-dist wbraganca/yii2-dynamicform "*"
```

or add

```
"wbraganca/yii2-dynamicform": "*"
```

to the require section of your `composer.json` file.


Usage
----------
###Hypothetical Scenario
![Database](http://wbraganca.com/img/yii2-dynamicform-db.png)

###The View

```php
<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
use wbraganca\dynamicform\DynamicFormWidget;
?>

<div class="customer-form">

    <?php $form = ActiveForm::begin(['id' => 'dynamic-form']); ?>
    <div class="row">
        <div class="col-sm-6">
            <?= $form->field($modelCustomer, 'first_name')->textInput(['maxlength' => 32]) ?>
        </div>
        <div class="col-sm-6">
            <?= $form->field($modelCustomer, 'last_name')->textInput(['maxlength' => 32]) ?>
        </div>
    </div>

    <div class="panel panel-default">
        <div class="panel-heading"><h4><i class="glyphicon glyphicon-envelope"></i> Addresses</h4></div>
        <div class="panel-body">
             <?php DynamicFormWidget::begin([
                'widgetContainer' => 'dynamicform_wrapper', // required: only alphanumeric characters plus "_" [A-Za-z0-9_]
                'widgetBody' => '.container-items', // required: css class selector
                'widgetItem' => '.item', // required: css class
                'limit' => 4, // the maximum times, an element can be cloned (default 999)
                'min' => 1, // 0 or 1 (default 1)
                'insertButton' => '.add-item', // css class
                'deleteButton' => '.remove-item', // css class
                'model' => $modelsAddress[0],
                'formId' => 'dynamic-form',
                'formFields' => [
                    'full_name',
                    'address_line1',
                    'address_line2',
                    'city',
                    'state',
                    'postal_code',
                ],
            ]); ?>

            <div class="container-items"><!-- widgetContainer -->
            <?php foreach ($modelsAddress as $i => $modelAddress): ?>
                <div class="item panel panel-default"><!-- widgetBody -->
                    <div class="panel-heading">
                        <h3 class="panel-title pull-left">Address</h3>
                        <div class="pull-right">
                            <button type="button" class="add-item btn btn-success btn-xs"><i class="glyphicon glyphicon-plus"></i></button>
                            <button type="button" class="remove-item btn btn-danger btn-xs"><i class="glyphicon glyphicon-minus"></i></button>
                        </div>
                        <div class="clearfix"></div>
                    </div>
                    <div class="panel-body">
                        <?php
                            // necessary for update action.
                            if (! $modelAddress->isNewRecord) {
                                echo Html::activeHiddenInput($modelAddress, "[{$i}]id");
                            }
                        ?>
                        <?= $form->field($modelAddress, "[{$i}]full_name")->textInput(['maxlength' => 64]) ?>
                        <div class="row">
                            <div class="col-sm-6">
                                <?= $form->field($modelAddress, "[{$i}]address_line1")->textInput(['maxlength' => 128]) ?>
                            </div>
                            <div class="col-sm-6">
                                <?= $form->field($modelAddress, "[{$i}]address_line2")->textInput(['maxlength' => 128]) ?>
                            </div>
                        </div><!-- .row -->
                        <div class="row">
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]city")->textInput(['maxlength' => 64]) ?>
                            </div>
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]state")->textInput(['maxlength' => 32]) ?>
                            </div>
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]postal_code")->textInput(['maxlength' => 15]) ?>
                            </div>
                        </div><!-- .row -->
                    </div>
                </div>
            <?php endforeach; ?>
            </div>
            <?php DynamicFormWidget::end(); ?>
        </div>
    </div>

    <div class="form-group">
        <?= Html::submitButton($modelAddress->isNewRecord ? 'Create' : 'Update', ['class' => 'btn btn-primary']) ?>
    </div>

    <?php ActiveForm::end(); ?>

</div>
```

###Javascript Events

```javascript

$(".dynamicform_wrapper").on("beforeInsert", function(e, item) {
    console.log("beforeInsert");
});

$(".dynamicform_wrapper").on("afterInsert", function(e, item) {
    console.log("afterInsert");
});

$(".dynamicform_wrapper").on("beforeDelete", function(e, item) {
    if (! confirm("Are you sure you want to delete this item?")) {
        return false;
    }
    return true;
});

$(".dynamicform_wrapper").on("afterDelete", function(e) {
    console.log("Deleted item!");
});

$(".dynamicform_wrapper").on("limitReached", function(e, item) {
    alert("Limit reached");
});

```


###The Controller (sample code)

```php
<?php

namespace app\controllers;

use Yii;
use app\models\Customer;
use app\models\CustomerSearch;
use app\models\Address;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use app\base\Model;
use yii\web\Response;
use yii\widgets\ActiveForm;
use yii\helpers\ArrayHelper;

/**
 * CustomerController implements the CRUD actions for Customer model.
 */
class CustomerController extends Controller
{
    ...

    /**
     * Creates a new Customer model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     * @return mixed
     */
    public function actionCreate()
    {
        $modelCustomer = new Customer;
        $modelsAddress = [new Address];
        if ($modelCustomer->load(Yii::$app->request->post())) {

            $modelsAddress = Model::createMultiple(Address::classname());
            Model::loadMultiple($modelsAddress, Yii::$app->request->post());

            // ajax validation
            if (Yii::$app->request->isAjax) {
                Yii::$app->response->format = Response::FORMAT_JSON;
                return ArrayHelper::merge(
                    ActiveForm::validateMultiple($modelsAddress),
                    ActiveForm::validate($modelCustomer)
                );
            }

            // validate all models
            $valid = $modelCustomer->validate();
            $valid = Model::validateMultiple($modelsAddress) && $valid;
            
            if ($valid) {
                $transaction = \Yii::$app->db->beginTransaction();
                try {
                    if ($flag = $modelCustomer->save(false)) {
                        foreach ($modelsAddress as $modelAddress) {
                            $modelAddress->customer_id = $modelCustomer->id;
                            if (! ($flag = $modelAddress->save(false))) {
                                $transaction->rollBack();
                                break;
                            }
                        }
                    }
                    if ($flag) {
                        $transaction->commit();
                        return $this->redirect(['view', 'id' => $modelCustomer->id]);
                    }
                } catch (Exception $e) {
                    $transaction->rollBack();
                }
            }
        }

        return $this->render('create', [
            'modelCustomer' => $modelCustomer,
            'modelsAddress' => (empty($modelsAddress)) ? [new Address] : $modelsAddress
        ]);
    }

    /**
     * Updates an existing Customer model.
     * If update is successful, the browser will be redirected to the 'view' page.
     * @param integer $id
     * @return mixed
     */
    public function actionUpdate($id)
    {
        $modelCustomer = $this->findModel($id);
        $modelsAddress = $modelCustomer->addresses;

        if ($modelCustomer->load(Yii::$app->request->post())) {

            $oldIDs = ArrayHelper::map($modelsAddress, 'id', 'id');
            $modelsAddress = Model::createMultiple(Address::classname(), $modelsAddress);
            Model::loadMultiple($modelsAddress, Yii::$app->request->post());
            $deletedIDs = array_diff($oldIDs, array_filter(ArrayHelper::map($modelsAddress, 'id', 'id')));

            // ajax validation
            if (Yii::$app->request->isAjax) {
                Yii::$app->response->format = Response::FORMAT_JSON;
                return ArrayHelper::merge(
                    ActiveForm::validateMultiple($modelsAddress),
                    ActiveForm::validate($modelCustomer)
                );
            }

            // validate all models
            $valid = $modelCustomer->validate();
            $valid = Model::validateMultiple($modelsAddress) && $valid;

            if ($valid) {
                $transaction = \Yii::$app->db->beginTransaction();
                try {
                    if ($flag = $modelCustomer->save(false)) {
                        if (! empty($deletedIDs)) {
                            Address::deleteAll(['id' => $deletedIDs]);
                        }
                        foreach ($modelsAddress as $modelAddress) {
                            $modelAddress->customer_id = $modelCustomer->id;
                            if (! ($flag = $modelAddress->save(false))) {
                                $transaction->rollBack();
                                break;
                            }
                        }
                    }
                    if ($flag) {
                        $transaction->commit();
                        return $this->redirect(['view', 'id' => $modelCustomer->id]);
                    }
                } catch (Exception $e) {
                    $transaction->rollBack();
                }
            }
        }

        return $this->render('update', [
            'modelCustomer' => $modelCustomer,
            'modelsAddress' => (empty($modelsAddress)) ? [new Address] : $modelsAddress
        ]);
    }

    ...
}
```

###Model Class

```php
<?php

namespace app\base;

use Yii;
use yii\helpers\ArrayHelper;

class Model extends \yii\base\Model
{
    public static function createMultiple($modelClass, $multipleModels=null)
    {
        $model    = new $modelClass;
        $formName = $model->formName();
        $post     = Yii::$app->request->post($formName);
        $models   = [];
        $flag     = false;

        if ($multipleModels !== null && is_array($multipleModels) && !empty($multipleModels)) {
            $keys = array_keys(ArrayHelper::map($multipleModels, 'id', 'id'));
            $multipleModels = array_combine($keys, $multipleModels);
            $flag = true;
        }

        if ($post && is_array($post)) {
            foreach ($post as $i => $item) {
                if ($flag) {
                    if (isset($item['id']) && !empty($item['id']) && isset($multipleModels[$item['id']])) {
                        $models[] = $multipleModels[$item['id']];
                    } else {
                        $models[] = new $modelClass;
                    }
                } else {
                    $models[] = new $modelClass;
                }
            }
        }
        unset($model, $formName, $post);
        return $models;
    }
}

```


###To zero or more elements (use the following code in your view file)


```php

<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
use wbraganca\dynamicform\DynamicFormWidget;
?>

<div class="customer-form">

    <?php $form = ActiveForm::begin(['id' => 'dynamic-form']); ?>
    <div class="row">
        <div class="col-sm-6">
            <?= $form->field($modelCustomer, 'first_name')->textInput(['maxlength' => 32]) ?>
        </div>
        <div class="col-sm-6">
            <?= $form->field($modelCustomer, 'last_name')->textInput(['maxlength' => 32]) ?>
        </div>
    </div>

    <?php DynamicFormWidget::begin([
        'widgetContainer' => 'dynamicform_wrapper', // required: only alphanumeric characters plus "_" [A-Za-z0-9_]
        'widgetBody' => '.container-items', // required: css class selector
        'widgetItem' => '.item', // required: css class
        'limit' => 4, // the maximum times, an element can be added (default 999)
        'min' => 0, // 0 or 1 (default 1)
        'insertButton' => '.add-item', // css class
        'deleteButton' => '.remove-item', // css class
        'model' => $modelsAddress[0],
        'formId' => 'dynamic-form',
        'formFields' => [
            'full_name',
            'address_line1',
            'address_line2',
            'city',
            'state',
            'postal_code',
        ],
    ]); ?>

    <div class="panel panel-default">
        <div class="panel-heading">
            <h4>
                <i class="glyphicon glyphicon-envelope"></i> Addresses
                <button type="button" class="add-item btn btn-success btn-sm pull-right"><i class="glyphicon glyphicon-plus"></i> Add</button>
            </h4>
        </div>
        <div class="panel-body">
            <div class="container-items"><!-- widgetBody -->
            <?php foreach ($modelsAddress as $i => $modelAddress): ?>
                <div class="item panel panel-default"><!-- widgetItem -->
                    <div class="panel-heading">
                        <h3 class="panel-title pull-left">Address</h3>
                        <div class="pull-right">
                            <button type="button" class="remove-item btn btn-danger btn-xs"><i class="glyphicon glyphicon-minus"></i></button>
                        </div>
                        <div class="clearfix"></div>
                    </div>
                    <div class="panel-body">
                        <?php
                            // necessary for update action.
                            if (! $modelAddress->isNewRecord) {
                                echo Html::activeHiddenInput($modelAddress, "[{$i}]id");
                            }
                        ?>
                        <?= $form->field($modelAddress, "[{$i}]full_name")->textInput(['maxlength' => 64]) ?>
                        <div class="row">
                            <div class="col-sm-6">
                                <?= $form->field($modelAddress, "[{$i}]address_line1")->textInput(['maxlength' => 128]) ?>
                            </div>
                            <div class="col-sm-6">
                                <?= $form->field($modelAddress, "[{$i}]address_line2")->textInput(['maxlength' => 128]) ?>
                            </div>
                        </div><!-- .row -->
                        <div class="row">
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]city")->textInput(['maxlength' => 64]) ?>
                            </div>
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]state")->textInput(['maxlength' => 32]) ?>
                            </div>
                            <div class="col-sm-4">
                                <?= $form->field($modelAddress, "[{$i}]postal_code")->textInput(['maxlength' => 15]) ?>
                            </div>
                        </div><!-- .row -->
                    </div>
                </div>
            <?php endforeach; ?>
            </div>
        </div>
    </div><!-- .panel -->
    <?php DynamicFormWidget::end(); ?>

    <div class="form-group">
        <?= Html::submitButton($modelAddress->isNewRecord ? 'Create' : 'Update', ['class' => 'btn btn-primary']) ?>
    </div>

    <?php ActiveForm::end(); ?>

</div>
```
