SmartGWT TreeGrid 禁用延迟加载

Question

我有一位来自 Isomorphic 的顾问开始开发 Web 应用程序，并提供了一个基础。对应用程序导航至关重要的树状网格具有按需加载的节点。我需要弄清楚如何更改它以从一开始就加载所有子项。

这里是 ds.xml 代码：

<DataSource serverType="sql" dbName="CSODatabaseCities"
    ID="Sensor"
    schema="dynamic"
    tableName="sensor_data">

    <fields>

        <field name="nodeId" type="int" />
        <field name="nodeName" type="text" />
        <field name="number" type="int" />
        <field name="title" type="text" />
        <field name="multiplier" type="float" />
        <field name="offset" type="float" />
        <field name="latitude" type="float"/>
        <field name="longitude" type="float"/>
        <field name="controlUrl" type="text" />

        <field name="structureType" type="text" />
        <field name="sensorType" type="text" >
            <valueMap>
                <value ID="d">Depth</value>
                <value ID="q">Flow</value>
                <value ID="rg">Rain Gauge</value>
                <value ID="t">Temperature</value>
                <value ID="v">Velocity</value>
            </valueMap>
        </field>

        <field name="criticalLow" type="float" />
        <field name="criticalHigh" type="float" />

        <field name="units" type="text" />
        <field name="latestValue" type="float" title="Reading" format="#.###"/>
        <field name="lastCollected" type="datetime" />
        <field name="percentUtilization" type="float" format="##.##'%'" title="Utilization" />
        <field name="percentUtilizationImageUrl" type="image">
            <customSelectExpression>
            CASE 
              WHEN percentUtilization &lt; 0 
                THEN CONCAT('structure/', structureType, '_0.bmp')
              WHEN percentUtilization &gt; 100 
                THEN CONCAT('structure/', structureType, '_100.bmp')
              WHEN structureType = 'raingauge' AND percentUtilization BETWEEN 0 AND 10 
                THEN CONCAT('structure/', structureType, '_10.bmp')      
              ELSE 
                CONCAT('structure/', structureType, '_', ROUND(percentUtilization, -1),'.bmp')      
            END
            </customSelectExpression>
        </field>

        <field name="parentId" type="text" title="Group" />
        <field name="sensorId" type="text" customSelectExpression="CONCAT('c',nodeId, '_', number)" />
        <field name="isFolder" hidden="true" canFilter="false" customSelectExpression="false" />

    </fields>

    <operationBinding operationType="fetch" operationId="fetchByParentGroup">
       <script language="groovy"><![CDATA[ 
           if (criteria.get('parentId', '/') == '/') {
               dsRequest.setOperationId('fetchSensorGroups');
           } else {
               dsRequest.setOperationId(null);
           }
           return dsRequest.execute();
       ]]></script>

    </operationBinding>

    <operationBinding operationType="fetch" operationId="fetchSensorGroups" >
       <selectClause>'/' AS parentId, TRIM(descr) AS sensorId, TRIM(descr) AS title, true AS isFolder, COUNT(*) AS sensorCount</selectClause>
       <tableClause>${rawValue.schema}.inodes</tableClause>
       <whereClause>
        sensType1 != 'No Sensor'
          OR sensType2 != 'No Sensor'
          OR sensType3 != 'No Sensor'
          OR sensType4 != 'No Sensor'
       </whereClause>
       <groupClause>descr</groupClause>
    </operationBinding>

    <operationBinding operationType="fetch" qualifyColumnNames="false">
        <tableClause>
        (
          SELECT TRIM(i.descr) AS parentId, i.id AS nodeId, i.name AS nodeName, 
            1 AS number, i.sensType1 AS title, i.a1 AS multiplier, i.b1 AS offset, 
            i.lat AS latitude, i.lon AS longitude, i.controlURL as controlUrl,
            s.structure_type_s1 AS structureType, s.sensor_type_s1 AS sensorType, 
            s.critical_low_s1 AS criticalLow, s.critical_high_s1 AS criticalHigh, 
            s.sensor1_units AS units, lv.sens1 AS latestValue, lv.time AS lastCollected,
            (lv.sens1 / s.critical_high_s1) * 100 AS percentUtilization
          FROM #schema.inodes i
            INNER JOIN #schema.inodes_structure_data s
              ON i.id = s.id
            LEFT JOIN #schema.inodes_latest_values lv
              ON i.id = lv.node_id
           WHERE i.sensType1 != 'No Sensor'

          UNION

          SELECT TRIM(i.descr) AS nodeGroup, i.id AS nodeId, i.name AS nodeName, 
            2 AS sensorNumber, i.sensType2 AS title, i.a2 AS multiplier, i.b2 AS offset, 
            i.lat AS latitude, i.lon AS longitude, i.controlURL as controlUrl,
            s.structure_type_s2 AS structureType, s.sensor_type_s2 AS sensorType, 
            s.critical_low_s2 AS criticalLow, s.critical_high_s2 AS criticalHigh, 
            s.sensor2_units AS units, lv.sens2 AS latestValue, lv.time AS lastCollected,
            (lv.sens2 / s.critical_high_s2) * 100
          FROM #schema.inodes i
            INNER JOIN #schema.inodes_structure_data s
              ON i.id = s.id
            LEFT JOIN #schema.inodes_latest_values lv
              ON i.id = lv.node_id
           WHERE i.sensType2 != 'No Sensor'

          UNION

          SELECT TRIM(i.descr) AS nodeGroup, i.id AS nodeId, i.name AS nodeName, 
            3 AS sensorNumber, i.sensType3 AS title, i.a3 AS multiplier, i.b3 AS offset,
            i.lat AS latitude, i.lon AS longitude, i.controlURL as controlUrl, 
            s.structure_type_s3 AS structureType, s.sensor_type_s3 AS sensorType, 
            s.critical_low_s3 AS criticalLow, s.critical_high_s3 AS criticalHigh, 
            s.sensor3_units AS units, lv.sens3 AS latestValue, lv.time AS lastCollected,
            (lv.sens3 / s.critical_high_s3) * 100
          FROM #schema.inodes i
            INNER JOIN #schema.inodes_structure_data s
              ON i.id = s.id
            LEFT JOIN #schema.inodes_latest_values lv
              ON i.id = lv.node_id
           WHERE i.sensType3 != 'No Sensor'

          UNION

          SELECT TRIM(i.descr) AS nodeGroup, i.id AS nodeId, i.name AS nodeName, 
            4 AS sensorNumber, i.sensType4 AS title, i.a4 AS multiplier, i.b4 AS offset, 
            i.lat AS latitude, i.lon AS longitude, i.controlURL as controlUrl,
            s.structure_type_s4 AS structureType, s.sensor_type_s4 AS sensorType, 
            s.critical_low_s4 AS criticalLow, s.critical_high_s4 AS criticalHigh, 
            s.sensor4_units AS units, lv.sens4 AS latestValue, lv.time AS lastCollected,
            (lv.sens4 / s.critical_high_s4) * 100
          FROM #schema.inodes i
            INNER JOIN #schema.inodes_structure_data s
              ON i.id = s.id
            LEFT JOIN #schema.inodes_latest_values lv
              ON i.id = lv.node_id
           WHERE i.sensType4 != 'No Sensor'

        ) sensor_data
        </tableClause>

    </operationBinding>

    <operationBinding operationType="add" requires="false" />
    <operationBinding operationType="remove" requires="false" />
    <operationBinding operationType="update" requires="false" />

</DataSource>

这里是与设置树网格相关的代码：

Tree tree = new Tree();
        tree.setModelType(TreeModelType.PARENT);
        tree.setRootValue("/");
        tree.setIdField("sensorId");  

        treeGrid.setFetchOperation("fetchByParentGroup");
        //treeGrid.setLoadDataOnDemand(false);
        treeGrid.setDataProperties(tree);
        treeGrid.setSort(new SortSpecifier("title", SortDirection.ASCENDING));

        treeGrid.setSelectionAppearance(SelectionAppearance.CHECKBOX);
        treeGrid.setShowPartialSelection(true);
        treeGrid.setCascadeSelection(true);

        treeGrid.setNodeIcon("[SKINIMG]SchemaViewer/simpleType.png");
        treeGrid.setFolderIcon("[SKINIMG]SchemaViewer/complexType.gif");

        treeGrid.setShowOpenIcons(false);
        treeGrid.setShowDropIcons(false);
        treeGrid.setClosedIconSuffix("");

        /*
         * Load selected children on demand and update listPane with currently
         * selected items
         */
        treeGrid.addSelectionUpdatedHandler(new SelectionUpdatedHandler() {
            @Override
            public void onSelectionUpdated(SelectionUpdatedEvent event) {

                final TreeNode updated = treeGrid.getRecord(treeGrid.getEventRow());
                final TreeNode[] children = treeGrid.getTree().getChildren(updated);

                if (updated.getAttributeAsBoolean("isFolder") && children.length == 0) {
                    treeGrid.getData().loadChildren(updated, new DSCallback() {
                        @Override
                        public void execute(DSResponse dsResponse, Object data,
                            DSRequest dsRequest) {
                            treeGrid.selectRecords(dsResponse.getData());
                        }
                    });
                } else {
                    RecordList selected = new RecordList(treeGrid.getSelectedRecords());
                    listGrid.setData(selected.findAll(new AdvancedCriteria("isFolder",
                        OperatorId.NOT_EQUAL, true)));

                }

                listGrid.selectRecord(0);
            }
        });

我已经尝试了几个小时来解决这个问题，但我终生无法弄清楚如何保持相同的外观（分组）并从一开始就加载所有传感器。

这是当前外观的图像，在展开父项之前不会获取传感器。

任何有关该主题的信息都将不胜感激。

Answer 1

setLoadDataOnDemand 方法是从头加载所有子项的好方法：

treeGrid.setLoadDataOnDemand(Boolean.FALSE);

SmartGWT TreeGrid 禁用延迟加载

SmartGWT TreeGrid disable lazy loading

java

gwt

datasource

smartgwt

treegrid