Powerful block system in Magento

最新推荐文章于 2025-12-06 15:19:30 发布

最新推荐文章于 2025-12-06 15:19:30 发布 · 80 阅读

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本文介绍了Magento中强大的块系统，详细解释了Mage_Core_Block_Abstract类如何作为Varien_Object的子类来实现灵活的块管理和嵌套。同时展示了Magento提供的两种使用块的方式：XML布局方式和对象方式，并提供了具体的代码示例。

When you read the class<wbr>Mage_Core_Block_Abstract,you will know that magento creates a very powerful block system. <div><br></div> <div>First of all,<wbr>Mage_Core_Block_Abstract is thesubclass of<wbr>Varien_Object. That is to say, magentospecific block class whose parent classis<wbr>Mage_Core_Block_Abstract can add as many childblocks as possible and access them in the array-style way.</wbr></wbr></wbr> </div> <div><br></div> <div><wbr><wbr> public functionsetChild($alias, $block)</wbr></wbr></div> <div> <div><code><wbr><wbr> {</wbr></wbr></code></div> <div><wbr><wbr><wbr><wbr> if (is_string($block)) {</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr><wbr><wbr> $block =$this->getLayout()->getBlock($block);</wbr></wbr></wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> if (!$block) {</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr><wbr><wbr> return$this;</wbr></wbr></wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr>$block->setParentBlock($this);</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr>$block->setBlockAlias($alias);</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> $this->_children[$alias] =$block;</wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> return $this;</wbr></wbr></wbr></wbr></div> <div><wbr><wbr> }</wbr></wbr></div> </div> <div><br></div> <div>Moreover, Magento provides two ways to use block: XML layoutway and object way.</div> <div><br></div> <div>1.Use XML layout way</div> <div><br></div> <div> <div><catalog_category_default></div> <div><wbr><wbr><wbr><wbr> <referencename="left"></wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr><wbr><blocktype="directory/currency" name="currency"template="directory/currency.phtml"/></wbr></wbr></wbr></wbr></wbr></div> <div><wbr><wbr><wbr><wbr> </reference></wbr></wbr></wbr></wbr></div> <div></catalog_category_default></div> <div><br></div> </div> <div>In the template file, use following statement<?php echo$this->getChildHtml("currency");?></div> <div><br></div> <div>2.Object way</div> <div><br></div> <div><?php</div> <div>$currency =new<wbr>Mage_Directory_Block_Currency();</wbr> </div> <div>echo<wbr><span style="line-height:21px">$currency->toHtml();</span></wbr> </div> <div>?></div> <div><br></div> </wbr>