实例演示:为component and context programming一里的T_marc,创建一个子节点T_mard。
并标记为Singleton,并为其分配一个supply function。根据父节点的物料号,工厂,读取
相应工厂下的各个库位的库存。
1,在component的context T_marc节点下创建一个子阶段t_mard,cardinaltiy 为1:n,Singleton复选框,够中。
在supply function里输入读取库存的方法名称。
2,在output_view视图里,做update mapping ,并增加一个Table UI元素,用于存放库存的数据。并进行相应的绑定。
3,component method,编写supply function方法。可以借助注释完成。
method GET_MARD .* General Notes* =============* A common scenario for a supply method is to aquire key* informations from the parameter <parent_element> and then* to invoke a data provider.* A free navigation thru the context, especially to nodes on* the same or deeper hierachical level is strongly discouraged,* because such a strategy may easily lead to unresolvable* situations!!* if necessary, get static attributes of parent element DATA ls_parent_attributes TYPE wd_this->element_t_marc. parent_element->get_static_attributes( IMPORTING static_attributes = ls_parent_attributes ).*** data declaration DATA lt_t_mard TYPE wd_this->Elements_t_mard. DATA ls_t_mard LIKE LINE OF lt_t_mard.** @TODO compute values** e.g. call a data providing FuBa*调用FM,读取应用数据。 CALL FUNCTION 'ZGET_MARD' EXPORTING material = ls_parent_attributes-matnr plant = ls_parent_attributes-werks tables t_mard = lt_t_mard .** bind all the elements node->bind_table( new_items = lt_t_mard set_initial_elements = abap_true ).*endmethod.
4,创建application,激活,测试如下。
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