Using sparse indexes

As described in the Grid guides, Store can use sparse indexes. This means that the store will not update a continuous index of all records, but instead will only modify the sparseIndex property of records that have been moved in the UI.

In a Gantt application, the stores are embedded into a ProjectModel, and by default not configured to use sparseIndex. To enable this feature, the useSparseIndex config must be set to true on the store instance. In most cases, this will be the taskStore of the project:

const project = new ProjectModel({
    taskStore : {
        useSparseIndex : true
    }
});

Utilizing this feature is only meaningful in conjunction with persistent storage, as the sparse index values must be saved and restored when loading data.

See also Project data loading and saving.

How it works

See more detailed information in the Grid guide: Using sparse indexes.