Graph

isEdge

Details:
Confirms if an element is an edge.
Example:

<script setup>
import { VueFlow, isEdge } from '@vue-flow/core'

const elements = ref([
  { id: '1', label: 'Node 1', position: { x: 250, y: 5 }, },
  { id: '2', label: 'Node 2', position: { x: 100, y: 100 }, },

  { id: 'e1-2', source: '1', target: '2', class: 'light' },
])

const toggleClass = () => {
  elements.value.forEach((el) => {
    if (isEdge(el)) {
      el.class = el.class === 'light' ? 'dark' : 'light'
    }
  })
}
</script>
<template>
  <VueFlow v-model="elements">
    <button style="position: absolute; top: 10px; right: 10px;" @click="toggleClass">Toggle classes</button>
  </VueFlow>
</template>

isNode

Details:
Confirms if an element is a node.
Example:

<script setup>
import { VueFlow, isNode } from '@vue-flow/core'

const elements = ref([
  { id: '1', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
  { id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },

  { id: 'e1-2', source: '1', target: '2' },
])

const toggleClass = () => {
  elements.value.forEach((el) => {
    if (isNode(el)) {
      el.class = el.class === 'light' ? 'dark' : 'light'
    }
  })
}
</script>
<template>
  <VueFlow v-model="elements">
    <button style="position: absolute; top: 10px; right: 10px;" @click="toggleClass">Toggle classes</button>
  </VueFlow>
</template>

addEdge

WARNING

In the composition API you should use addEdges of useVueFlow

Details:
Confirms if an element is a node.
Example:

<script setup>
import { VueFlow, addEdge } from '@vue-flow/core'

const elements = ref([
  { id: '1', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
  { id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },

  { id: 'e1-2', source: '1', target: '2' },
])

const onConnect = (params) => {
  addEdge(params, elements.value)
}
</script>
<template>
  <VueFlow v-model="elements" @connect="onConnect" />
</template>

updateEdge

WARNING

In the composition API you should use updateEdge of useVueFlow

Details:
Updates an edge and applies new source/target.
Example:

<script setup>
import { VueFlow, updateEdge } from '@vue-flow/core'

const elements = ref([
  { id: '1', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
  { id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },

  { id: 'e1-2', source: '1', target: '2' },
])

const onEdgeUpdate = ({ edge, connection }) => {
  elements.value = updateEdge(edge, connection, elements.value)
}
</script>
<template>
  <VueFlow v-model="elements" @edge-update="onEdgeUpdate" />
</template>