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data-request

Description​

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

Usage​

"data-request": CustomEvent;

Parameters​

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

  • CustomEvent - a Svelte custom event which you can bind to the event handler

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 data-request action is triggered while scrolling and we add the event handler that receives the row.start and row.end values and loads data.

<script>
    import { Grid } from "wx-svelte-grid";
    import { getData } from "./common/data";
    const { allData, columns } = getData();

    let rowsCount = 500;

    let data = [];

    function dataProvider(ev) {
        const { requestData } = ev.detail;
        const { row } = requestData;

        if (row) data = allData.slice(row.start, row.end);
    }
</script>

<Grid 
   data={allData}
   {columns}
   dynamic={{ rowsCount }}
   on:data-request={dataProvider} />

Related articles: Dynamic data loading