36. In Depth Magento System Configuration

1.< label/> and < comment/>

<label>this is label</label><comment>这是评论</comment>

2.< show_in_default/>, < show_in_website/>, < show_in_store/>

in the default view, the website view, or the store view.<show_in_default>1</show_in_default><show_in_website>1</show_in_website><show_in_store>1</show_in_store>

3.< sort_order/>

<sort_order>10</sort_order>数值越高，排序越低

4.< frontend_type/>

<frontend_type>multiselect</frontend_type>决定字段的类型

5.< frontend_class/>

<frontend_class>free-method</frontend_class>用来改变我们字段的 class 名

6. < validate/>


<validate>validate-email</validate>不能同时加 <frontend_class/>
添加验证类型

7.< can_be_empty/>

<can_be_empty>1</can_be_empty>为ture 的话，将出现隐藏字段

8.< depends/>

依赖于其他字段的值，然后是否显示<frontend_type>select</frontend_type><source_model>adminhtml/system_config_source_yesno</source_model><depends><specificcountry>1</specificcountry></depends>

9.< source_model/>

指定了 model 类，
<source_model>module/modelname::methodName</source_model>
默认为  toOptionArray() 方法。

10.< frontend_model/>

By default, Magento Form Elements are rendered with the Block classMage_Adminhtml_Block_System_Config_Form_Field<frontend_model>adminhtml/system_config_form_field_notification</frontend_model>specifies that a field renderer of adminhtml/system_config_form_field_notification should be used. This translates into the following class

11.< backend_model/>

表单提交，默认的处理类为：
Mage_Core_Model_Config_Data< backend_model/> 允许你指定不同的backend model<backend_model>adminhtml/system_config_backend_shipping_tablerate</backend_model>

class Mage_Adminhtml_Model_System_Config_Backend_Shipping_Tablerate extends Mage_Core_Model_Config_Data
{public function _afterSave(){Mage::getResourceModel('shipping/carrier_tablerate')->uploadAndImport($this);}
}

Here the core team is hooking into the _afterSave method (which is called after a model is saved) to update the shipping/carrier_tablerate Model with information from the just uploaded file.

12.< upload_dir/> and < base_url/>

Both these tags are used with System Configuration fields that use the <frontend_type>image</frontend_type> field with a <backend_model>adminhtml/system_config_backend_image</backend_model> backend model. These determine both1.Where the image file is uploaded
2.The base URI path used when rendering an <img> tag

http://alanstorm.com/magento_system_configuration_in_depth_tutorial

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