Question title
How to progressively load sub-nodes in a list with the VTable component?
Problem description
Using the VTable table component, how to gradually load sub-nodes in the list, click the expand button of the parent node, and then dynamically load the information of the sub-node
Solution
VTable provides setRecordChildrenAPI to update the sub-node status of a node, which can be used to implement progressive loading function
Data preparation
Normally, in the data of the tree structure list, the childrenattribute is an array, which is the sub-node information of the node
name: ‘a‘,
value: 10,
children: [
{
name: ‘a-1‘,
value: 5,
children: [
// ……
]
},
// ……
]
}
How to dynamically load sub-node information, you can configure the childrenproperty to true. At this time, the node will be displayed as the parent node in the table, but clicking the expand button in the cell will trigger relevant events, but the table will not have any active changes.
Monitoring events
After the expand button is clicked, the VTable. ListTable.EVENT_TYPEevent will be triggered. You need to listen to this event and use the setRecordChildrenAPI to update the sub-node information
instance.on(TREE_HIERARCHY_STATE_CHANGE, args => {
if (args.hierarchyState === VTable.TYPES.HierarchyState.expand && !Array.isArray(args.originData.children)) {
setTimeout(() => {
const children = [
{
name: ‘a-1‘,
value: 5,
},
{
name: ‘a-2‘,
value: 5
}
];
instance.setRecordChildren(children, args.col, args.row);
}, 200);
}
});
Code example
demo：https://visactor.io/vtable/demo/table-type/list-table-tree-lazy-load
Related Documents
Related api: https://visactor.io/vtable/option/ListTable-columns-text#tree
Tutorial: https://visactor.io/vtable/guide/table_type/List_table/tree_list
