Class yii\bootstrap4\Modal

                public function init()
{
    parent::init();
    $this->initOptions();
    echo $this->renderToggleButton() . "\n";
    echo Html::beginTag('div', $this->options) . "\n";
    echo Html::beginTag('div', $this->dialogOptions) . "\n";
    echo Html::beginTag('div', ['class' => 'modal-content']) . "\n";
    echo $this->renderHeader() . "\n";
    echo $this->renderBodyBegin() . "\n";
}

            

                protected function initOptions()
{
    $this->options = array_merge([
        'class' => 'fade',
        'role' => 'dialog',
        'tabindex' => -1,
        'aria-hidden' => 'true'
    ], $this->options);
    Html::addCssClass($this->options, ['widget' => 'modal']);
    if ($this->clientOptions !== false) {
        $this->clientOptions = array_merge(['show' => false], $this->clientOptions);
    }
    $this->titleOptions = array_merge([
        'id' => $this->options['id'] . '-label'
    ], $this->titleOptions);
    if (!isset($this->options['aria-label'], $this->options['aria-labelledby']) && $this->title !== null) {
        $this->options['aria-labelledby'] = $this->titleOptions['id'];
    }
    if ($this->closeButton !== false) {
        $this->closeButton = array_merge([
            'data-dismiss' => 'modal',
            'class' => 'close',
            'type' => 'button',
        ], $this->closeButton);
    }
    if ($this->toggleButton !== false) {
        $this->toggleButton = array_merge([
            'data-toggle' => 'modal',
            'type' => 'button'
        ], $this->toggleButton);
        if (!isset($this->toggleButton['data-target']) && !isset($this->toggleButton['href'])) {
            $this->toggleButton['data-target'] = '#' . $this->options['id'];
        }
    }
    $this->dialogOptions = array_merge([
        'role' => 'document'
    ], $this->dialogOptions);
    Html::addCssClass($this->dialogOptions, ['widget' => 'modal-dialog']);
    if ($this->size) {
        Html::addCssClass($this->dialogOptions, ['size' => $this->size]);
    }
    if ($this->centerVertical) {
        Html::addCssClass($this->dialogOptions, ['align' => 'modal-dialog-centered']);
    }
    if ($this->scrollable) {
        Html::addCssClass($this->dialogOptions, ['scroll' => 'modal-dialog-scrollable']);
    }
}

            

                protected function renderBodyBegin()
{
    Html::addCssClass($this->bodyOptions, ['widget' => 'modal-body']);
    return Html::beginTag('div', $this->bodyOptions);
}

            

                protected function renderBodyEnd()
{
    return Html::endTag('div');
}

            

                protected function renderCloseButton()
{
    if (($closeButton = $this->closeButton) !== false) {
        $tag = ArrayHelper::remove($closeButton, 'tag', 'button');
        $label = ArrayHelper::remove($closeButton, 'label', Html::tag('span', '×', [
            'aria-hidden' => 'true'
        ]));
        return Html::tag($tag, $label, $closeButton);
    } else {
        return null;
    }
}

            

                protected function renderFooter()
{
    if ($this->footer !== null) {
        Html::addCssClass($this->footerOptions, ['widget' => 'modal-footer']);
        return Html::tag('div', "\n" . $this->footer . "\n", $this->footerOptions);
    } else {
        return null;
    }
}

            

                protected function renderHeader()
{
    $button = $this->renderCloseButton();
    if ($this->title !== null) {
        Html::addCssClass($this->titleOptions, ['widget' => 'modal-title']);
        $header = Html::tag('h5', $this->title, $this->titleOptions);
    } else {
        $header = '';
    }
    if ($button !== null) {
        $header .= "\n" . $button;
    } elseif ($header === '') {
        return '';
    }
    Html::addCssClass($this->headerOptions, ['widget' => 'modal-header']);
    return Html::tag('div', "\n" . $header . "\n", $this->headerOptions);
}

            

                protected function renderToggleButton()
{
    if (($toggleButton = $this->toggleButton) !== false) {
        $tag = ArrayHelper::remove($toggleButton, 'tag', 'button');
        $label = ArrayHelper::remove($toggleButton, 'label', 'Show');
        return Html::tag($tag, $label, $toggleButton);
    } else {
        return null;
    }
}

            

                public function run()
{
    echo "\n" . $this->renderBodyEnd();
    echo "\n" . $this->renderFooter();
    echo "\n" . Html::endTag('div'); // modal-content
    echo "\n" . Html::endTag('div'); // modal-dialog
    echo "\n" . Html::endTag('div');
    $this->registerPlugin('modal');
}