onListDrawingLayouts

Last updated 8/03/2026

Drawing layout listing handler

This example demonstrates how the

onListDrawingLayouts

callback sends a request using the Fetch API to retrieve layouts for a drawing. Once the request completes, the result and returned layouts are provided to the widget through the

onResponse

callback.

Drawing layout listing handler

onListDrawingLayouts = async function (drawing: DIQ_DrawingRevision, onResponse: (result: DIQ_Result, layouts: Array<DIQ_Layout> | null ) => void) {
    try {
        const res = await fetch(`/api/drawings/${drawing.key}/layouts`, {
            method: "GET",
            headers: {
                "Content-Type": "application/json"
            }
        });

        if (!res.ok) {
            throw new Error(`HTTP ${res.status}`);
        }

        const layouts: DIQ_Layout[] = await res.json();

        onResponse({ ok: true }, layouts);

    } catch (err) {
        onResponse({
            ok: false,
            message: err.message || "Failed to fetch layouts"
        }, null);
    }
};