ABAP程序中的ALV显示是很常用的一种数据展示手段，除了常规的alv，有时也会用到ALV tree这种有层次结构的展示方式更好的展现数据，下面介绍一个创建list alv tree的方法：
1）用函数RS_TREE_CONSTRUCT构造alv 树的层次结构，
alv tree的节点类型(node type)分两种：T和P，区别如下：区别就是个文件夹的图标。
2）调用函数RS_TREE_LIST_DISPLAY显示alv tree
完整代码：
用list alv tree来显示采购订单和采购订单行项目。
REPORT ztest_tree_alv. *Data declaration for additional node information DATA : gwa_node TYPE snodetext. *Internal table for nodes DATA : git_node LIKE TABLE OF gwa_node. DATA:git_ekko TYPE STANDARD TABLE OF ekko WITH HEADER LINE, git_ekpo TYPE STANDARD TABLE OF ekpo WITH HEADER LINE. CLEAR : gwa_node. REFRESH: git_node. SELECT * FROM ekko INTO TABLE git_ekko UP TO 10 ROWS. SELECT * INTO TABLE git_ekpo FROM ekpo FOR ALL ENTRIES IN git_ekko WHERE ebeln = git_ekko-ebeln. gwa_node-type = 'T'. "第一个 gwa_node-id = 'FIRST'. gwa_node-name = '采购'. gwa_node-tlevel = 1. "层次一 gwa_node-nlength = '15'. gwa_node-color = '4'. gwa_node-text = '采购订单信息'. gwa_node-tlength ='20'. gwa_node-tcolor = 3. APPEND gwa_node TO git_node. LOOP AT git_ekko. CLEAR gwa_node. gwa_node-type = 'P'. gwa_node-id = 'HEAD'. gwa_node-name = '采购订单号'. gwa_node-tlevel = 2. "层次二 gwa_node-nlength = '8'. gwa_node-color = '1'. gwa_node-text = git_ekko-ebeln. gwa_node-tlength ='20'. gwa_node-tcolor = 4. APPEND gwa_node TO git_node. CLEAR gwa_node. LOOP AT git_ekpo where ebeln = git_ekko-ebeln. CLEAR gwa_node. gwa_node-type = 'P'. gwa_node-id = 'ITEM'. gwa_node-name = '行项目'. gwa_node-tlevel = 3. "层次三 gwa_node-nlength = '6'. gwa_node-color = '1'. gwa_node-text = git_ekpo-ebelp. gwa_node-tlength ='5'. gwa_node-tcolor = 4. APPEND gwa_node TO git_node. CLEAR gwa_node. ENDLOOP. ENDLOOP. *Fm for constructing the tree CALL FUNCTION 'RS_TREE_CONSTRUCT' TABLES nodetab = git_node. *FM for displaying the tree CALL FUNCTION 'RS_TREE_LIST_DISPLAY' EXPORTING callback_program = sy-repid check_duplicate_name = '1' color_of_node = '4' color_of_mark = '3' color_of_link = '1' color_of_match = '5' node_length = 30 text_length = 75 use_control = 'L'.
运行结果：
以上。
原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/19230.html