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<?php
/*
* This file is part of the 2amigos/yii2-chartjs-widget project.
* (c) 2amigOS! <http://2amigos.us/>
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace dosamigos\chartjs;
use yii\base\InvalidConfigException;
use yii\base\Widget;
use yii\helpers\Html;
use yii\helpers\Json;
use yii\web\JsExpression;
/**
*
* Chart renders a canvas ChartJs plugin widget.
*/
class ChartJs extends Widget
{
/**
* @var array the HTML attributes for the widget container tag.
*/
public $options = [];
/**
* @var array the options for the underlying ChartJs JS plugin.
* Please refer to the corresponding ChartJs type plugin Web page for possible options.
* For example, [this page](http://www.chartjs.org/docs/#lineChart) shows
* how to use the "Line chart" plugin.
*/
public $clientOptions = [];
/**
* @var array the datasets configuration options and data to display on the chart.
* See [its documentation](http://www.chartjs.org/docs/) for the different options.
*/
public $data = [];
/**
* @var string the type of chart to display. The possible options are:
* - "Line" : A line chart is a way of plotting data points on a line. Often, it is used to show trend data, and the
* comparison of two data sets.
* - "Bar" : A bar chart is a way of showing data as bars. It is sometimes used to show trend data, and the
* comparison of multiple data sets side by side.
* - "Radar" : A radar chart is a way of showing multiple data points and the variation between them. They are often
* useful for comparing the points of two or more different data sets
* - "PolarArea" : Polar area charts are similar to pie charts, but each segment has the same angle - the radius of
* the segment differs depending on the value. This type of chart is often useful when we want to show a comparison
* data similar to a pie chart, but also show a scale of values for context.
* - "Pie" : Pie charts are probably the most commonly used chart there are. They are divided into segments, the arc
* of each segment shows a the proportional value of each piece of data.
* - "Doughnut" : Doughnut charts are similar to pie charts, however they have the centre cut out, and are therefore
* shaped more like a doughnut than a pie!
*/
public $type;
/**
* @var array the plugin objects allowing to assign custom callback functions to Chart events.
* See [plugins & events documentation]
* (http://www.chartjs.org/docs/latest/developers/plugins.html#plugin-core-api).
*/
public $plugins = [];
/**
* Initializes the widget.
* This method will register the bootstrap asset bundle. If you override this method,
* make sure you call the parent implementation first.
* @throws InvalidConfigException
*/
public function init()
{
parent::init();
if ($this->type === null) {
throw new InvalidConfigException("The 'type' option is required");
}
if (!isset($this->options['id'])) {
$this->options['id'] = $this->getId();
}
}
/**
* Renders the widget.
*/
public function run()
{
echo Html::tag('canvas', '', $this->options);
$this->registerClientScript();
}
/**
* Registers the required js files and script to initialize ChartJS plugin
*/
protected function registerClientScript()
{
$id = $this->options['id'];
$view = $this->getView();
ChartJsAsset::register($view);
$config = Json::encode(
[
'type' => $this->type,
'data' => $this->data ?: new JsExpression('{}'),
'options' => $this->clientOptions ?: new JsExpression('{}'),
'plugins' => $this->plugins
]
);
$js = ";var chartJS_{$id} = new Chart($('#{$id}'),{$config});";
$view->registerJs($js);
}
}
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