在静态调用的方法中使用小部件 [英] Use a widget in a statically-called method

问题描述

通常通过在 CController 的实例上调用 CController::widget() 来使用小部件，通常是在视图中的 $this .

Normally a widget is used by calling CController::widget() on an instance of CController, typically $this in a view.

但是如果我正在编写一个静态方法，比如一个助手，那么我就无法访问 CController 的实例.那么如何使用小部件?

But if I'm writing a static method, a helper, say, then I don't have access to an instance of CController. So how do I use a widget?

让我们进一步说，这个辅助方法是在 CDataColumn 的 value 属性中的 eval() 表达式中调用的.那种糟糕的表达几乎没有任何背景.助手应该如何使用小部件?

Let's say further that this helper method is invoked in the eval()’ed expression in a CDataColumn's value property. That poor expression has almost no context at all. How should the helper use a widget?

根据要求，视图示例:

$this->widget('zii.widgets.grid.CGridView', array(
    'dataProvider' => $model->search(),
    'columns' => array(
        array(
            'name' => 'attrName',
            'value' => '--USE WIDGET HERE--',
        ),
    )
));

推荐答案

这个答案没有回答一般的问题，而是在特定情况下——如何访问控制器并在计算表达式的上下文中使用小部件CDataColumn::$value——你可以使用这个:

This answer doesn't answer the question in general but in the specific case—how to access the controller and use a widget in the context of the evaluated expression of CDataColumn::$value—you can use this:

$this->widget('zii.widgets.grid.CGridView', array(
    'dataProvider' => $model->search(),
    'columns' => array(
        array(
            'name' => 'attrName',
            'value' => function ($data, $row, $column) {
                $controller = $column->grid->owner;
                $controller->widget(/* ... etc ... */);
            }, 
        ),
   )
));

诀窍是发现 CDataColumn::renderDataCellContent() 使用 CComponent::evaluateExpression()，它将组件实例作为最后一个参数注入回调.在这种情况下，组件是 CDataColumn，它引用控制器，如图所示.

The trick was discovering that CDataColumn::renderDataCellContent() uses CComponent::evaluateExpression(), which injects the component instance into the callback as the last parameter. In this case that omponent is the CDataColumn, which references the controller as shown.

我不喜欢将 PHP 表达式写为字符串文字，所以我很高兴找到这个选项.

I don't like writing PHP expressions as string literals so I'm pleased to find this option.

对http://www.yiiframework.com/doc/api/1.1/的评论CDataColumn#value-detail 向我们展示了我尚未尝试过的列值中的小部件的另一种方法.

A comment on http://www.yiiframework.com/doc/api/1.1/CDataColumn#value-detail shows another way to us a widget in a column value that I haven't tried.

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