online表單下拉樹控件 使用場景：當表單值改變的時候，獲取表單值，后臺根據該表單值重新加載樹的數據。 `@date:2022/11/08` 效果演示：  >[info] 1.這里重新加載需要自定義一個請求用于獲取數據 > 2.請求返回的數據結構參考后臺實體類：org.jeecg.modules.system.model.TreeSelectModel js增強定義： ``` loaded(){ this.$nextTick(()=>{ let url = '/test/tree/loadTreeData'; //獲取當前wenben輸入框的值 let value = event.value; let params = {wenben: value}; //此處的cust_tree為下拉樹的字段名 this.updateSchema({ field: 'cust_tree', componentProps: { url: url, params: params } }) }) } onlChange(){ return { wenben(){ let url = '/test/tree/loadTreeData'; //獲取當前wenben輸入框的值 let value = event.value; let params = {wenben: value}; //此處的cust_tree為下拉樹的字段名 this.updateSchema({ field: 'cust_tree', componentProps: { url: url, params: params } }) } } } ``` java請求定義： ~~~ @GetMapping("/loadTreeData") public Result<List<TreeSelectModel>> loadTreeData(HttpServletRequest request) { Result<List<TreeSelectModel>> result = new Result<List<TreeSelectModel>>(); // 此處模擬json，見下方test.json， 實際根據參數自行查詢 String jsonData = oConvertUtils.readStatic("classpath:static/test/test.json"); JSONObject json = JSONObject.parseObject(jsonData); JSONArray array = json.getJSONArray("data"); List<TreeSelectModel> list = array.toJavaList(TreeSelectModel.class); result.setSuccess(true); result.setResult(list); return result; } ~~~ test.json： ~~~ { "data": [ { "title": "安徽省", "value": "1", "leaf": false, "children": [ { "title": "合肥市", "value": "11", "leaf": false, "children": [ { "title": "A區", "value": "111", "leaf": true }, { "title": "B區", "value": "112", "leaf": true }, { "title": "C區", "value": "113", "leaf": true } ] }, { "title": "蕪湖市", "value": "12", "leaf": false, "children": [ { "title": "D區", "value": "121", "leaf": true }, { "title": "E區", "value": "122", "leaf": true } ] } ] }, { "title": "河南省", "value": "2", "leaf": false, "children": [ { "title": "鄭州市", "value": "21", "leaf": false, "children": [ { "title": "X區", "value": "211", "leaf": true }, { "title": "Y區", "value": "212", "leaf": true }, { "title": "Z區", "value": "213", "leaf": true } ] }, { "title": "洛陽市", "value": "22", "leaf": false, "children": [ { "title": "O區", "value": "221", "leaf": true }, { "title": "P區", "value": "222", "leaf": true } ] } ] } ] } ~~~ >[warning]注意: 如果自定義請求的數據和online控件配置的樹的數據不是一張表，那么通過此方法錄入的數據，不會在列表上自動顯示具體的文本，需要通過java增強(查詢)來實現列表數據顯示的轉換。