Function triggerDefaultState

dash/dash-renderer/src/actions/index.js:85–156

(dispatch, getState)

}

function triggerDefaultState(dispatch, getState) {
    const {graphs, paths, layout} = getState();

    // overallOrder will assert circular dependencies for multi output.
    try {
        graphs.MultiGraph.overallOrder();
    } catch (err) {
        dispatch(
            onError({
                type: 'backEnd',
                error: {
                    message: 'Circular Dependencies',
                    html: err.toString()
                }
            })
        );
    }

    const layoutCallbacks = getLayoutCallbacks(
        graphs,
        paths,
        layout.components,
        {
            outputsOnly: true
        }
    );

    // Also include no-output and no-input callbacks that should fire on initial load
    const specialCallbacks = (graphs.callbacks || []).reduce((acc, cb) => {
        if (cb.prevent_initial_call) {
            return acc;
        }

        const isNoOutput = cb.noOutput;
        const isNoInput = !cb.noOutput && cb.inputs.length === 0;

        if (!isNoOutput && !isNoInput) {
            return acc;
        }

        const resolved = makeResolvedCallback(cb, resolveDeps(), '');
        resolved.initialCall = true;

        if (isNoOutput) {
            // No-output: include if no inputs or any input is in layout
            if (cb.inputs.length === 0) {
                acc.push(resolved);
            } else {
                const inputs = resolved.getInputs(paths);
                if (
                    inputs.some(inp =>
                        Array.isArray(inp) ? inp.length > 0 : inp
                    )
                ) {
                    acc.push(resolved);
                }
            }
        } else {