public function run()
{
$blockId = 'block_' . $this->id;
$this->view->beginBlock($blockId);
$inputFile = InputFile::begin(ArrayHelper::merge(['model' => $this->model, 'attribute' => $this->attribute, 'name' => $this->name, 'value' => $this->value], $this->fileInputOptions));
$inputId = $inputFile->options['id'];
$previewId = 'media-' . $inputId;
InputFile::end();
$this->view->endBlock();
$replace['{input}'] = $this->view->blocks[$blockId];
$replace['{img}'] = Html::tag('div', '', ['class' => 'form-media-preview', 'id' => $previewId]);
echo strtr($this->template, $replace);
$this->view->registerJs(<<<JS
\$('#{$inputId}').change(function() {
var src = \$(this).val();
if (src != '') {
var img = \$('<img/>').attr('src', src);
\$('#{$previewId}').wrapInner(img);
} else {
\$('#{$previewId}').empty();
}
}).change();
JS
);
}
