Calendar control in Yii framework: implementing date picker

As web applications become more and more complex, powerful web frameworks become more and more important. One framework worth considering is Yii. Yii is a high-performance, component-based framework for rapid development of modern web applications. In addition to many other features, Yii also provides a built-in calendar control that makes date picker very simple.

In this article, we will explore the calendar control in Yii, learn how to use it in your application, and how to customize it to suit your needs.

How to use Yii's calendar control?

Yii's calendar control is based on jQuery UI Datepicker, so before using it, you need to make sure you have installed jQuery and the jQuery UI library. Starting from Yii version 1.1.15, a widget named "yiijui[DatePicker](http://www.yiiframework.com/doc/api/1.1/CJuiDatePicker)" has been added to Yii to enable the use of Datepicker becomes simpler.

First, you need to install the "yiijui" package:

composer require yiisoft/yii2-jui

Next, add the following content in the view to use DatePicker:

<?=$form->field($model, 'attribute')->widget(yiijuiDatePicker::class, [
    'dateFormat' => 'yyyy-MM-dd',
    'options' => [
        'class' => 'form-control',
    ],
])?>

Where, 'attribute' is A property in your model used to pass data between the view and controller. In the above code, the DatePicker widget contains various options such as 'dateFormat', which tells it in what format you want the selected date to be displayed, and 'options' which specifies the style class name.

In addition, DatePicker comes with some styles for warning, error and success status, so that when the user selects an invalid date, it can automatically mark it as an error status.

How to customize Yii’s calendar control?

While Yii's DatePicker provides some good default settings, you may need to customize it some. For example, you might want to link it with another widget, or change its default appearance.

Custom Options

To modify the default settings, pass an array via the 'options' option. For example, to change the default date format, use the following code:

<?=$form->field($model, 'attribute')->widget(yiijuiDatePicker::class, [
    'dateFormat' => 'dd M yy',
    'options' => [
        'class' => 'form-control',
    ],
])?>

In the above code, we have used the 'dateFormat' option to change the date format to 'dd M yy'.

Custom events

DatePicker also supports various events to trigger custom logic when the user selects a date. For example, in the code below, we use the 'beforeShow' event to calculate some value before selecting the date:

<?=$form->field($model, 'attribute')->widget(yiijuiDatePicker::class, [
    'dateFormat' => 'dd M yy',
    'options' => [
        'class' => 'form-control',
    ],
    'clientOptions' => [
        'beforeShow' => "function(date, inst) {
            // 自定义逻辑
        }",
    ],
])?>

Here, we use the 'clientOptions' option to pass a JavaScript object that contains the The event and its handler to customize. In this example, we set the 'beforeShow' event to trigger an anonymous function called "function(date, inst)" and handle the calculation logic.

Custom Style

Finally, you may want to change the default appearance of the DatePicker. To customize the style, you can use one of the following options: 'clientOptions' or 'options'. You can manipulate it directly using the HTML attributes provided in the $options option, or use other keys such as 'messages', 'events' or 'cssFile' to manipulate it advancedly.

Conclusion

Yii's calendar control is a very powerful widget that can help you quickly implement a date picker and provides many options for customization. Before using it, make sure you are familiar with jQuery and the jQuery UI library and can customize it if needed. In future projects, please consider using Yii's DatePicker widget to simplify your code and increase development efficiency.

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