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request-data

Description​

Fires while scrolling or at the initialization stage if dynamic data loading is enabled

Usage​

"request-data": ({
    start:{
        start:number;
        end:number;
    }
}) => boolean|void;

Parameters​

The callback of the action is the function with the following parameter:

  • row - (required) current row position, which includes
    • start - (required) start row index
    • end - (required) end row index

Example​

In the example below we use the dynamic property to enable dynamic data loading and specify the number of all rows in a dataset. The request-data action is triggered while scrolling and we add the event handler that receives the row.start and row.end values and prepares data according to these indices.

<script>
    import { Grid } from "wx-svelte-grid";
    import { getData } from "./common/data";

    const { allData, columns } = getData();

    let rowCount = $state(100);

    let data = $state([]);

    function dataProvider(ev) {
        const { row } = ev;
        if (row) 
            data = allData.slice(row.start, row.end);
    }

</script>
  <Grid 
   {data}
   {columns}
   dynamic={{ rowCount }}
   onrequestdata={dataProvider} />

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