Yii2 Bootstrap 3
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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\web;
use Yii;
use yii\helpers\FileHelper;
use yii\helpers\Html;
use yii\web\JqueryAsset;
use yii\web\AssetBundle;
use yii\widgets\Block;
use yii\widgets\ContentDecorator;
use yii\widgets\FragmentCache;
use yii\base\InvalidConfigException;
/**
* View represents a view object in the MVC pattern.
*
* View provides a set of methods (e.g. [[render()]]) for rendering purpose.
*
* View is configured as an application component in [[yii\base\Application]] by default.
* You can access that instance via `Yii::$app->view`.
*
* You can modify its configuration by adding an array to your application config under `components`
* as it is shown in the following example:
*
* ~~~
* 'view' => [
* 'theme' => 'app\themes\MyTheme',
* 'renderers' => [
* // you may add Smarty or Twig renderer here
* ]
* // ...
* ]
* ~~~
*
* @property \yii\web\AssetManager $assetManager The asset manager. Defaults to the "assetManager" application
* component.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class View extends \yii\base\View
{
const EVENT_BEGIN_BODY = 'beginBody';
/**
* @event Event an event that is triggered by [[endBody()]].
*/
const EVENT_END_BODY = 'endBody';
/**
* The location of registered JavaScript code block or files.
* This means the location is in the head section.
*/
const POS_HEAD = 1;
/**
* The location of registered JavaScript code block or files.
* This means the location is at the beginning of the body section.
*/
const POS_BEGIN = 2;
/**
* The location of registered JavaScript code block or files.
* This means the location is at the end of the body section.
*/
const POS_END = 3;
/**
* The location of registered JavaScript code block.
* This means the JavaScript code block will be enclosed within `jQuery(document).ready()`.
*/
const POS_READY = 4;
/**
* This is internally used as the placeholder for receiving the content registered for the head section.
*/
const PH_HEAD = '<![CDATA[YII-BLOCK-HEAD]]>';
/**
* This is internally used as the placeholder for receiving the content registered for the beginning of the body section.
*/
const PH_BODY_BEGIN = '<![CDATA[YII-BLOCK-BODY-BEGIN]]>';
/**
* This is internally used as the placeholder for receiving the content registered for the end of the body section.
*/
const PH_BODY_END = '<![CDATA[YII-BLOCK-BODY-END]]>';
/**
* @var AssetBundle[] list of the registered asset bundles. The keys are the bundle names, and the values
* are the registered [[AssetBundle]] objects.
* @see registerAssetBundle()
*/
public $assetBundles = [];
/**
* @var string the page title
*/
public $title;
/**
* @var array the registered meta tags.
* @see registerMetaTag()
*/
public $metaTags;
/**
* @var array the registered link tags.
* @see registerLinkTag()
*/
public $linkTags;
/**
* @var array the registered CSS code blocks.
* @see registerCss()
*/
public $css;
/**
* @var array the registered CSS files.
* @see registerCssFile()
*/
public $cssFiles;
/**
* @var array the registered JS code blocks
* @see registerJs()
*/
public $js;
/**
* @var array the registered JS files.
* @see registerJsFile()
*/
public $jsFiles;
private $_assetManager;
/**
* Registers the asset manager being used by this view object.
* @return \yii\web\AssetManager the asset manager. Defaults to the "assetManager" application component.
*/
public function getAssetManager()
{
return $this->_assetManager ?: Yii::$app->getAssetManager();
}
/**
* Sets the asset manager.
* @param \yii\web\AssetManager $value the asset manager
*/
public function setAssetManager($value)
{
$this->_assetManager = $value;
}
/**
* Marks the ending of an HTML page.
*/
public function endPage()
{
$this->trigger(self::EVENT_END_PAGE);
$content = ob_get_clean();
foreach (array_keys($this->assetBundles) as $bundle) {
$this->registerAssetFiles($bundle);
}
echo strtr($content, [
self::PH_HEAD => $this->renderHeadHtml(),
self::PH_BODY_BEGIN => $this->renderBodyBeginHtml(),
self::PH_BODY_END => $this->renderBodyEndHtml(),
]);
unset(
$this->metaTags,
$this->linkTags,
$this->css,
$this->cssFiles,
$this->js,
$this->jsFiles
);
}
/**
* Registers all files provided by an asset bundle including depending bundles files.
* Removes a bundle from [[assetBundles]] once files are registered.
* @param string $name name of the bundle to register
*/
private function registerAssetFiles($name)
{
if (!isset($this->assetBundles[$name])) {
return;
}
$bundle = $this->assetBundles[$name];
foreach ($bundle->depends as $dep) {
$this->registerAssetFiles($dep);
}
$bundle->registerAssetFiles($this);
unset($this->assetBundles[$name]);
}
/**
* Marks the beginning of an HTML body section.
*/
public function beginBody()
{
echo self::PH_BODY_BEGIN;
$this->trigger(self::EVENT_BEGIN_BODY);
}
/**
* Marks the ending of an HTML body section.
*/
public function endBody()
{
$this->trigger(self::EVENT_END_BODY);
echo self::PH_BODY_END;
}
/**
* Marks the position of an HTML head section.
*/
public function head()
{
echo self::PH_HEAD;
}
/**
* Registers the named asset bundle.
* All dependent asset bundles will be registered.
* @param string $name the name of the asset bundle.
* @param integer|null $position if set, this forces a minimum position for javascript files.
* This will adjust depending assets javascript file position or fail if requirement can not be met.
* If this is null, asset bundles position settings will not be changed.
* See [[registerJsFile]] for more details on javascript position.
* @return AssetBundle the registered asset bundle instance
* @throws InvalidConfigException if the asset bundle does not exist or a circular dependency is detected
*/
public function registerAssetBundle($name, $position = null)
{
if (!isset($this->assetBundles[$name])) {
$am = $this->getAssetManager();
$bundle = $am->getBundle($name);
$this->assetBundles[$name] = false;
// register dependencies
$pos = isset($bundle->jsOptions['position']) ? $bundle->jsOptions['position'] : null;
foreach ($bundle->depends as $dep) {
$this->registerAssetBundle($dep, $pos);
}
$this->assetBundles[$name] = $bundle;
} elseif ($this->assetBundles[$name] === false) {
throw new InvalidConfigException("A circular dependency is detected for bundle '$name'.");
} else {
$bundle = $this->assetBundles[$name];
}
if ($position !== null) {
$pos = isset($bundle->jsOptions['position']) ? $bundle->jsOptions['position'] : null;
if ($pos === null) {
$bundle->jsOptions['position'] = $pos = $position;
} elseif ($pos > $position) {
throw new InvalidConfigException("An asset bundle that depends on '$name' has a higher javascript file position configured than '$name'.");
}
// update position for all dependencies
foreach ($bundle->depends as $dep) {
$this->registerAssetBundle($dep, $pos);
}
}
return $bundle;
}
/**
* Registers a meta tag.
* @param array $options the HTML attributes for the meta tag.
* @param string $key the key that identifies the meta tag. If two meta tags are registered
* with the same key, the latter will overwrite the former. If this is null, the new meta tag
* will be appended to the existing ones.
*/
public function registerMetaTag($options, $key = null)
{
if ($key === null) {
$this->metaTags[] = Html::tag('meta', '', $options);
} else {
$this->metaTags[$key] = Html::tag('meta', '', $options);
}
}
/**
* Registers a link tag.
* @param array $options the HTML attributes for the link tag.
* @param string $key the key that identifies the link tag. If two link tags are registered
* with the same key, the latter will overwrite the former. If this is null, the new link tag
* will be appended to the existing ones.
*/
public function registerLinkTag($options, $key = null)
{
if ($key === null) {
$this->linkTags[] = Html::tag('link', '', $options);
} else {
$this->linkTags[$key] = Html::tag('link', '', $options);
}
}
/**
* Registers a CSS code block.
* @param string $css the CSS code block to be registered
* @param array $options the HTML attributes for the style tag.
* @param string $key the key that identifies the CSS code block. If null, it will use
* $css as the key. If two CSS code blocks are registered with the same key, the latter
* will overwrite the former.
*/
public function registerCss($css, $options = [], $key = null)
{
$key = $key ?: md5($css);
$this->css[$key] = Html::style($css, $options);
}
/**
* Registers a CSS file.
* @param string $url the CSS file to be registered.
* @param array $options the HTML attributes for the link tag.
* @param string $key the key that identifies the CSS script file. If null, it will use
* $url as the key. If two CSS files are registered with the same key, the latter
* will overwrite the former.
*/
public function registerCssFile($url, $options = [], $key = null)
{
$key = $key ?: $url;
$this->cssFiles[$key] = Html::cssFile($url, $options);
}
/**
* Registers a JS code block.
* @param string $js the JS code block to be registered
* @param integer $position the position at which the JS script tag should be inserted
* in a page. The possible values are:
*
* - [[POS_HEAD]]: in the head section
* - [[POS_BEGIN]]: at the beginning of the body section
* - [[POS_END]]: at the end of the body section
* - [[POS_READY]]: enclosed within jQuery(document).ready(). This is the default value.
* Note that by using this position, the method will automatically register the jQuery js file.
*
* @param string $key the key that identifies the JS code block. If null, it will use
* $js as the key. If two JS code blocks are registered with the same key, the latter
* will overwrite the former.
*/
public function registerJs($js, $position = self::POS_READY, $key = null)
{
$key = $key ?: md5($js);
$this->js[$position][$key] = $js;
if ($position === self::POS_READY) {
JqueryAsset::register($this);
}
}
/**
* Registers a JS file.
* Please note that when this file depends on other JS files to be registered before,
* for example jQuery, you should use [[registerAssetBundle]] instead.
* @param string $url the JS file to be registered.
* @param array $options the HTML attributes for the script tag. A special option
* named "position" is supported which specifies where the JS script tag should be inserted
* in a page. The possible values of "position" are:
*
* - [[POS_HEAD]]: in the head section
* - [[POS_BEGIN]]: at the beginning of the body section
* - [[POS_END]]: at the end of the body section. This is the default value.
*
* @param string $key the key that identifies the JS script file. If null, it will use
* $url as the key. If two JS files are registered with the same key, the latter
* will overwrite the former.
*/
public function registerJsFile($url, $options = [], $key = null)
{
$position = isset($options['position']) ? $options['position'] : self::POS_END;
unset($options['position']);
$key = $key ?: $url;
$this->jsFiles[$position][$key] = Html::jsFile($url, $options);
}
/**
* Renders the content to be inserted in the head section.
* The content is rendered using the registered meta tags, link tags, CSS/JS code blocks and files.
* @return string the rendered content
*/
protected function renderHeadHtml()
{
$lines = [];
if (!empty($this->metaTags)) {
$lines[] = implode("\n", $this->metaTags);
}
$request = Yii::$app->getRequest();
if ($request instanceof \yii\web\Request && $request->enableCsrfValidation) {
$lines[] = Html::tag('meta', '', ['name' => 'csrf-var', 'content' => $request->csrfVar]);
$lines[] = Html::tag('meta', '', ['name' => 'csrf-token', 'content' => $request->getCsrfToken()]);
}
if (!empty($this->linkTags)) {
$lines[] = implode("\n", $this->linkTags);
}
if (!empty($this->cssFiles)) {
$lines[] = implode("\n", $this->cssFiles);
}
if (!empty($this->css)) {
$lines[] = implode("\n", $this->css);
}
if (!empty($this->jsFiles[self::POS_HEAD])) {
$lines[] = implode("\n", $this->jsFiles[self::POS_HEAD]);
}
if (!empty($this->js[self::POS_HEAD])) {
$lines[] = Html::script(implode("\n", $this->js[self::POS_HEAD]), ['type' => 'text/javascript']);
}
return empty($lines) ? '' : implode("\n", $lines);
}
/**
* Renders the content to be inserted at the beginning of the body section.
* The content is rendered using the registered JS code blocks and files.
* @return string the rendered content
*/
protected function renderBodyBeginHtml()
{
$lines = [];
if (!empty($this->jsFiles[self::POS_BEGIN])) {
$lines[] = implode("\n", $this->jsFiles[self::POS_BEGIN]);
}
if (!empty($this->js[self::POS_BEGIN])) {
$lines[] = Html::script(implode("\n", $this->js[self::POS_BEGIN]), ['type' => 'text/javascript']);
}
return empty($lines) ? '' : implode("\n", $lines);
}
/**
* Renders the content to be inserted at the end of the body section.
* The content is rendered using the registered JS code blocks and files.
* @return string the rendered content
*/
protected function renderBodyEndHtml()
{
$lines = [];
if (!empty($this->jsFiles[self::POS_END])) {
$lines[] = implode("\n", $this->jsFiles[self::POS_END]);
}
if (!empty($this->js[self::POS_END])) {
$lines[] = Html::script(implode("\n", $this->js[self::POS_END]), ['type' => 'text/javascript']);
}
if (!empty($this->js[self::POS_READY])) {
$js = "jQuery(document).ready(function(){\n" . implode("\n", $this->js[self::POS_READY]) . "\n});";
$lines[] = Html::script($js, ['type' => 'text/javascript']);
}
return empty($lines) ? '' : implode("\n", $lines);
}
}