element树形控件拖拽后怎样获取所有值

拖拽后，树的treeData的结构也跟着改变了的，无须再去修改。如果里面有参数要修改的话用递归的方式处理一下就行了

dealtreeData(treeData, parent_id) {

treeDataforEach((item) => {

if (

parent_id !== null &&

parent_id !== "" &&

typeof parent_id !== "undefined"

) {

itemparent_id = parent_id;

}

if (itemchildren && itemchildrenlength > 0) {

thisdealtreeData(itemchildren, itemid);

}

});

},

// 树拖动

onDrop() {

//修改节点的parent_id

thisdealtreeData(thistreeData, 0);

},

数据库是什么数据库

我先假设你是 Oracle 吧。

CREATE TABLE test_tree (

test_id INT NOT NULL,

pid INT,

test_val VARCHAR(10),

PRIMARY KEY (test_id)

);

INSERT INTO test_tree VALUES(1, NULL, 'NET');

INSERT INTO test_tree VALUES(2, 1, 'C#');

INSERT INTO test_tree VALUES(3, 1, 'J#');

INSERT INTO test_tree VALUES(4, 1, 'ASPNET');

INSERT INTO test_tree VALUES(5, 1, 'VBNET');

INSERT INTO test_tree VALUES(6, NULL, 'J2EE');

INSERT INTO test_tree VALUES(7, 6, 'EJB');

INSERT INTO test_tree VALUES(8, 6, 'Servlet');

INSERT INTO test_tree VALUES(9, 6, 'JSP');

INSERT INTO test_tree VALUES(10, NULL, 'Database');

INSERT INTO test_tree VALUES(11, 10, 'DB2');

INSERT INTO test_tree VALUES(12, 10, 'MySQL');

INSERT INTO test_tree VALUES(13, 10, 'Oracle');

INSERT INTO test_tree VALUES(14, 10, 'SQL Server');

INSERT INTO test_tree VALUES(15, 13, 'PL/SQL');

INSERT INTO test_tree VALUES(16, 15, 'Function');

INSERT INTO test_tree VALUES(17, 15, 'Procedure');

INSERT INTO test_tree VALUES(18, 15, 'Package');

INSERT INTO test_tree VALUES(19, 15, 'Cursor');

INSERT INTO test_tree VALUES(20, 14, 'T-SQL');

使用 START WITH CONNECT BY 语句实现树状查询

通过根节点 向下查询子节点

SELECT

LPAD(' ', 2(LEVEL-1)) || test_val AS test_val

FROM

test_tree

START WITH

test_id IN (1, 6, 10)

CONNECT BY PRIOR test_id = pid;

TEST_VAL

-----------------------------------------------------------

NET

C#

J#

ASPNET

VBNET

J2EE

EJB

Servlet

JSP

Database

DB2

TEST_VAL

-----------------------------------------------------------

MySQL

Oracle

PL/SQL

Function

Procedure

Package

Cursor

SQL Server

T-SQL

20 rows selected

用标准sql的with实现递归查询（sql2005以上肯定支持，sql2000不清楚是否支持）：

with subqry(id,name,pid) as (

select id,name,pid from test1 where id = 5

union all

select test1id,test1name,test1pid from test1,subqry

where test1pid = subqryid

)

select from subqry;

以上就是关于element树形控件拖拽后怎样获取所有值全部的内容，包括:element树形控件拖拽后怎样获取所有值、数据库表有3列，Id,Name,ParentId,已从数据库读出数据，如何递归成一棵树、怎么获取递归树的所有叶子节点sql等相关内容解答，如果想了解更多相关内容，可以关注我们，你们的支持是我们更新的动力！