easyui中的樹可以從標記中建立,也可以通過指定一個URL屬性讀取數據建立。如果想建立一棵異步樹,需要為每個節點指定一個id屬性值,這樣在加載數據時會自動向后台傳遞id參數。
<ul id="tt"></ul>
編寫前台代碼:
$('#tt').tree({ url:'/demo2/node/getNodes' // The url will be mapped to NodeController class and getNodes method });
為測試用,建立一個節點的數據模型:
@Table(name="nodes") public class Node extends ActiveRecordBase{ @Id public Integer id; @Column public Integer parentId; @Column public String name; public boolean hasChildren() throws Exception{ long count = count(Node.class, "parentId=?", new Object[]{id}); return count > 0; } }
編寫后台的控制器代碼:
public class NodeController extends ApplicationController{ /** * get nodes, if the 'id' parameter equals 0 then load the first level nodes, * otherwise load the children nodes * @param id the parent node id value * @return the tree required node json format * @throws Exception */ public View getNodes(int id) throws Exception{ List<Node> nodes = null; if (id == 0){ // return the first level nodes nodes = Node.findAll(Node.class, "parentId=0 or parentId is null", null); } else { // return the children nodes nodes = Node.findAll(Node.class, "parentId=?", new Object[]{id}); } List<Map<String,Object>> items = new ArrayList<Map<String,Object>>(); for(Node node: nodes){ Map<String,Object> item = new HashMap<String,Object>(); item.put("id", node.id); item.put("text", node.name); // the node has children, // set the state to 'closed' so the node can asynchronous load children nodes if (node.hasChildren()){ item.put("state", "closed"); } items.add(item); } return new JsonView(items); } }
官網例子地址:http://www.jeasyui.com/tutorial/tree/tree2.php
http://www.runoob.com/jeasyui/jeasyui-tree-tree2.html
重要的事情說三遍!!!
$('#tt').tree({
method:"POST", url:'/demo2/node/getNodes' // The url will be mapped to NodeController class and getNodes method });
method一定要用POST,GET的話要在URL后面用一個變量來做時間戳處理。
method一定要用POST,GET的話要在URL后面用一個變量來做時間戳處理。
method一定要用POST,GET的話要在URL后面用一個變量來做時間戳處理。
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