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examples: add confirm delete example (#1466)
* examples: add confirm delete example * docs: add confirm delete example
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‎docs/examples/confirm-delete/App.vue‎

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<script setup>
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import { ref } from 'vue'
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import { VueFlow, useVueFlow } from '@vue-flow/core'
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import { Background } from '@vue-flow/background'
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import { useDialog } from './useDialog'
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import Dialog from './Dialog.vue'
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const { onConnect, addEdges, onNodesChange, onEdgesChange, applyNodeChanges, applyEdgeChanges } = useVueFlow()
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const dialog = useDialog()
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const nodes = ref([
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{ id: '1', type: 'input', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
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{ id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },
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{ id: '3', label: 'Node 3', position: { x: 400, y: 100 }, class: 'light' },
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{ id: '4', label: 'Node 4', position: { x: 400, y: 200 }, class: 'light' },
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])
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const edges = ref([
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{ id: 'e1-2', source: '1', target: '2', animated: true },
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{ id: 'e1-3', source: '1', target: '3' },
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])
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onConnect(addEdges)
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onNodesChange(async (changes) => {
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const nextChanges = []
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for (const change of changes) {
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if (change.type === 'remove') {
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const isConfirmed = await dialog.confirm(`Do you really want to delete this node: ${change.id}?`)
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if (isConfirmed) {
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nextChanges.push(change)
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}
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} else {
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nextChanges.push(change)
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}
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}
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applyNodeChanges(nextChanges)
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})
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onEdgesChange(async (changes) => {
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const nextChanges = []
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for (const change of changes) {
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if (change.type === 'remove') {
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const isConfirmed = await dialog.confirm(`Do you really want to delete this edge: ${change.id}?`)
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if (isConfirmed) {
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nextChanges.push(change)
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}
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} else {
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nextChanges.push(change)
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}
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}
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applyEdgeChanges(nextChanges)
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})
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</script>
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<template>
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<VueFlow :nodes="nodes" :edges="edges" :apply-default="false" fit-view-on-init class="vue-flow-basic-example">
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<Background />
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<Dialog />
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</VueFlow>
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</template>

‎docs/examples/confirm-delete/Dialog.vue‎

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<script setup>
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import { useDialogState } from './useDialog.js'
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const { isVisible, message, resolve } = useDialogState()
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function confirm() {
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resolve(true)
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isVisible.value = false
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}
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function cancel() {
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resolve(false)
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isVisible.value = false
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}
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</script>
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<template>
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<div v-if="isVisible" class="dialog-overlay">
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<div class="dialog">
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<p>{{ message }}</p>
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<div class="dialog-actions">
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<button @click="confirm">Confirm</button>
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<button @click="cancel">Cancel</button>
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</div>
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</div>
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</div>
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</template>
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<style>
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.dialog-overlay {
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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background-color: rgba(0, 0, 0, 0.5);
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z-index: 1000;
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}
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.dialog {
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background: white;
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padding: 20px;
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border-radius: 5px;
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text-align: center;
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}
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.dialog-actions {
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margin-top: 20px;
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display: flex;
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justify-content: center;
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gap: 8px;
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}
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</style>

‎docs/examples/confirm-delete/index.ts‎

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export { default as ConfirmApp } from './App.vue?raw'
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export { default as ConfirmDialog } from './Dialog.vue?raw'
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export { default as useDialog } from './useDialog.js?raw'

‎docs/examples/confirm-delete/useDialog.js‎

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import { ref } from 'vue'
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const isVisible = ref(false)
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const message = ref('')
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let resolveCallback
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export function useDialogState() {
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return {
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isVisible,
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message,
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resolve: (value) => {
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if (resolveCallback) {
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resolveCallback(value)
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}
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},
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}
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}
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export function useDialog() {
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return {
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confirm(msg) {
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isVisible.value = true
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message.value = msg
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return new Promise((resolve) => {
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resolveCallback = resolve
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})
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},
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}
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}

‎docs/examples/index.ts‎

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import { ToolbarApp, ToolbarNode } from './node-toolbar'
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import { LayoutApp, LayoutEdge, LayoutElements, LayoutIcon, LayoutNode, useLayout, useRunProcess, useShuffle } from './layout'
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import { MathApp, MathCSS, MathElements, MathIcon, MathOperatorNode, MathResultNode, MathValueNode } from './math'
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import { ConfirmApp, ConfirmDialog, useDialog } from './confirm-delete'
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export const exampleImports = {
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basic: {
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'style.css': MathCSS,
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'initial-elements.js': MathElements,
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},
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confirmDelete: {
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'App.vue': ConfirmApp,
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'Dialog.vue': ConfirmDialog,
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'useDialog.js': useDialog,
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},
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}

‎docs/src/.vitepress/config.mts‎

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{ text: 'Save & Restore', link: '/examples/save' },
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{ text: 'Math Operation Flow', link: '/examples/math' },
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{ text: 'Screenshot', link: '/examples/screenshot' },
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{ text: 'Confirm Delete', link: '/examples/confirm' },
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{ text: 'Node Visibility', link: '/examples/hidden' },
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{ text: 'Node Intersections', link: '/examples/intersection' },
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{ text: 'Multiple Flows', link: '/examples/multi' },

‎docs/src/examples/confirm.md‎

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# Confirm Delete
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Sometimes you want to confirm a delete action before it happens. Here's how you can do that with a simple dialog.
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This example also demonstrates how to take-over the application of changes to the graph. This is useful when you want to confirm changes before they are applied.
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<div class="mt-6">
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<Repl example="confirmDelete"></Repl>
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</div>

‎examples/vite/router.ts‎

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path: '/screenshot',
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component: () => import('./src/Screenshot/ScreenshotExample.vue'),
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},
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{
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path: '/confirm-delete',
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component: () => import('./src/ConfirmDelete/ConfirmDeleteExample.vue'),
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},
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]
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export const router = createRouter({

‎examples/vite/src/ConfirmDelete/ConfirmDeleteExample.vue‎

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<script lang="ts" setup>
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import type { Edge, EdgeChange, Node, NodeChange } from '@vue-flow/core'
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import { VueFlow, useVueFlow } from '@vue-flow/core'
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import { Background } from '@vue-flow/background'
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import { useDialog } from './useDialog'
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import Dialog from './Dialog.vue'
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const { onConnect, addEdges, onNodesChange, onEdgesChange, applyNodeChanges, applyEdgeChanges } = useVueFlow()
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const dialog = useDialog({ message: 'Do you really want to delete this item?' })
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const nodes = ref<Node[]>([
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{ id: '1', type: 'input', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
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{ id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },
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{ id: '3', label: 'Node 3', position: { x: 400, y: 100 }, class: 'light' },
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{ id: '4', label: 'Node 4', position: { x: 400, y: 200 }, class: 'light' },
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])
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const edges = ref<Edge[]>([
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{ id: 'e1-2', source: '1', target: '2', animated: true },
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{ id: 'e1-3', source: '1', target: '3' },
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])
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onConnect(addEdges)
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onNodesChange(async (changes) => {
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const nextChanges: NodeChange[] = []
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for (const change of changes) {
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if (change.type === 'remove') {
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const isConfirmed = await dialog.confirm()
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if (isConfirmed) {
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nextChanges.push(change)
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}
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} else {
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nextChanges.push(change)
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}
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}
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applyNodeChanges(nextChanges)
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})
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onEdgesChange(async (changes) => {
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const nextChanges: EdgeChange[] = []
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for (const change of changes) {
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if (change.type === 'remove') {
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const isConfirmed = await dialog.confirm()
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if (isConfirmed) {
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nextChanges.push(change)
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}
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} else {
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nextChanges.push(change)
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}
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}
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applyEdgeChanges(nextChanges)
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})
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</script>
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<template>
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<VueFlow :nodes="nodes" :edges="edges" :apply-default="false" fit-view-on-init class="vue-flow-basic-example">
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<Background />
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<Dialog />
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</VueFlow>
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</template>

‎examples/vite/src/ConfirmDelete/Dialog.vue‎

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<script setup lang="ts">
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import { useDialogState } from './useDialog'
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const { isVisible, message, resolve } = useDialogState()
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function confirm() {
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resolve(true)
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isVisible.value = false
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}
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function cancel() {
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resolve(false)
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isVisible.value = false
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}
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</script>
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<template>
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<div v-if="isVisible" class="dialog-overlay">
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<div class="dialog">
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<p>{{ message }}</p>
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<div class="dialog-actions">
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<button @click="confirm">Confirm</button>
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<button @click="cancel">Cancel</button>
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</div>
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</div>
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</div>
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</template>
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<style>
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.dialog-overlay {
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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background-color: rgba(0, 0, 0, 0.5);
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z-index: 1000;
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}
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.dialog {
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background: white;
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padding: 20px;
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border-radius: 5px;
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text-align: center;
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}
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.dialog-actions {
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margin-top: 20px;
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display: flex;
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justify-content: center;
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gap: 8px;
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}
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</style>

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