Administrator / test_1

<?php
use yii\helpers\Html;
?>
<div class="fields_result">
<?php $i=0; foreach ($model as $field):?>
    <?= Html::beginTag('div',['class'=>'form-group'])?>
    <input  type="text" class="form-control" value="<?= $field->value ?>" name="Fields[phone][<?=$i++?>][value]" />
    <span data-id="<?= $field->id ?>" title="удалить" class="glyphicon glyphicon-trash delete-field-item"></span>
    <?= Html::endTag('div')?>
<?php endforeach; ?>
</div>
<p class="btn btn-success add_field">Добавить поле</p>


<script>
    $( document ).ready(function(){
        var start_i = <?=$i?>;
        $('.add_field').click(function(){
            var block = $('.fields_result');
            var sub_block = '<div class="form-group">'+
                            '<input type="text"   class="form-control" value="" name="Fields[phone]['+ start_i++ +'][value]">'+
                            '<span data-id="none" title="удалить" class="glyphicon glyphicon-trash delete-field-item"></span>'+
                        '<div>';
            block.append(sub_block);

        });
    });
</script>