在magento布局xml中使用条件

问题描述

想知道是否有人将magento布局XML中的or语句用于自定义模块吗?我意识到我可以检查模块控制器中的值或自身块，但这似乎是逻辑存在的逻辑场所.

Wondering if anyone has used the or statements in magento's layout XML for a custom module? I realise that I could check the values in the module controller or block itself, but it seems like a logical place for the logic to live.

Mage_Core在catalog.xml中使用它们来测试javascript. <!--<params/><if/><condition>can_load_calendar_js</condition>-->

Mage_Core uses them in catalog.xml to test for javascript. <!--<params/><if/><condition>can_load_calendar_js</condition>-->

谢谢，京东

推荐答案

我会回避使用它们.您会注意到，它们在默认的分布式社区版本中已被注释掉，这可能意味着核心团队正在逐渐放弃使用它们.

I'd shy away from using those. You'll notice they're commented out in the default distributed community edition, which probably means the core team is moving away from using them.

如果您对它们的功能感兴趣，那么它们就是参数，严格来说，它们是page/head块的addItem方法的一部分.

If you're interested in what they do, they're paramaters that are strictly a part of the page/head block's addItem method.

File: code/core/Mage/Page/Block/Html/Head.php
public function addItem($type, $name, $params=null, $if=null, $cond=null)
{
    if ($type==='skin_css' && empty($params)) {
        $params = 'media="all"';
    }
    $this->_data['items'][$type.'/'.$name] = array(
        'type'   => $type,
        'name'   => $name,
        'params' => $params,
        'if'     => $if,
        'cond'   => $cond,
   );
    return $this;
}

添加项目方法存储这些条件，然后在getCssJsHtml方法中稍后将其用于跳过添加项目.

The add item method stores these conditions, and then they're used later in the getCssJsHtml method to skip adding an item.

public function getCssJsHtml()
{
    // separate items by types
    $lines  = array();
    foreach ($this->_data['items'] as $item) {
        if (!is_null($item['cond']) && !$this->getData($item['cond']) || !isset($item['name'])) {
            continue;
        }

我的猜测是，这是他们在模板系统中添加元编程的早期尝试，最终使目标用户的头上大吃一惊.

My guess is they were an early attempt to add meta-programming to the template system, which ended up going over the head of its intended users.

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