验证并丰富新的优势

两个连接时挂钩让消费者拥有边缘创建。 isValidConnection 在手势期间实时运行 - 无效的目标会绘制红色预览并且无法删除，并且永远不会为此咨询 before-create 挂钩。一旦选择了有效目标，onBeforeEdgeCreate就在边缘存在之前运行：返回false以否决，或{ accept: true, data, style, directed }接受并用标签、样式和方向标记新边缘。它可能是异步的——阴影边缘预览会保持不变，直到稳定下来。

单击编辑图形（右上角）→添加边，然后连接节点。在这里，您只能将人链接到项目 - 相同类型的链接预览为红色并被拒绝实时。有效的 drop 会模拟保存，然后创建一个带标签的定向边 - 除了 archived 项目，before-create 钩子会在事后否决该项目。

选项数据

// Both hooks live under the full UI mode's Edit Graph → Add Edge tool.
const options = {
    // Off: `full` mode brings a minimap and the data dock, and this card is about
    // neither (see the Minimap and Data table cards for those).
    UI: { mode: 'full', minimap: false, table: false },
    callbacks: {
        // Live predicate — runs on every hover while connecting. Only cross-type
        // links (person ↔ project) are valid; anything else previews red and can't
        // be dropped. onBeforeEdgeCreate is never consulted for a rejected target.
        isValidConnection: (source, target) =>
            source.getData().type !== target.getData().type,

        // Before-create hook — fires once a valid target is picked, before the edge
        // exists. Async here: we simulate persisting the link, then either veto or
        // accept with an enriched label / style / direction.
        onBeforeEdgeCreate: async ({ source, target, origin }) => {
            // Veto after the fact: no new links onto an archived project.
            if (source.getData().archived || target.getData().archived) {
                graph.notifier.warning('Archived', 'Project Orion is archived — no new links.')
                return false
            }

            graph.notifier.info('Saving…', `${source.getData().label} → ${target.getData().label}`)
            await wait(600) // stand-in for a backend POST that could fail

            const person = source.getData().type === 'person' ? source : target
            const project = person === source ? target : source
            graph.notifier.success('Linked', `${person.getData().label} assigned to ${project.getData().label}`)

            // Accept and stamp the new edge — the consumer decides what it carries.
            return {
                accept: true,
                data: { label: 'assigned-to', via: origin },
                style: { edge: { strokeColor: '#6366f1' } },
                directed: true
            }
        }
    }
}

const data = {
    nodes: [
        { id: 'alice', data: { label: 'Alice', type: 'person' } },
        { id: 'bob', data: { label: 'Bob', type: 'person' } },
        { id: 'carol', data: { label: 'Carol', type: 'person' } },
        { id: 'atlas', data: { label: 'Project Atlas', type: 'project' } },
        { id: 'nova', data: { label: 'Project Nova', type: 'project' } },
        { id: 'orion', data: { label: 'Orion (archived)', type: 'project', archived: true } }
    ],
    edges: [
        { from: 'alice', to: 'atlas', data: { label: 'assigned-to' } }
    ]
}

验证并丰富新的优势 ​

验证并丰富新的优势