_update() — vue Function Reference

Architecture documentation for the _update() function in directives.ts from the vue codebase.

Function typescript VueCore VDom calls 2 called by 1

Entity Profile

VueCore→ VDom→ _update() — vue Function Reference

Dependency Diagram

graph TD
  c17676a5_46ed_d3dd_d968_0fa11724f89d["_update()"]
  a07220f3_beb1_7821_9810_d794a7a56504["directives.ts"]
  c17676a5_46ed_d3dd_d968_0fa11724f89d -->|defined in| a07220f3_beb1_7821_9810_d794a7a56504
  67cc9c40_0253_1452_7081_d52aeee8a6ce["updateDirectives()"]
  67cc9c40_0253_1452_7081_d52aeee8a6ce -->|calls| c17676a5_46ed_d3dd_d968_0fa11724f89d
  d582937b_dc98_d390_a8bf_68c0aa0feedf["normalizeDirectives()"]
  c17676a5_46ed_d3dd_d968_0fa11724f89d -->|calls| d582937b_dc98_d390_a8bf_68c0aa0feedf
  3b888604_82d9_e163_e6ba_cc72b61a7802["callHook()"]
  c17676a5_46ed_d3dd_d968_0fa11724f89d -->|calls| 3b888604_82d9_e163_e6ba_cc72b61a7802
  style c17676a5_46ed_d3dd_d968_0fa11724f89d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/core/vdom/modules/directives.ts lines 22–84

function _update(oldVnode, vnode) {
  const isCreate = oldVnode === emptyNode
  const isDestroy = vnode === emptyNode
  const oldDirs = normalizeDirectives(
    oldVnode.data.directives,
    oldVnode.context
  )
  const newDirs = normalizeDirectives(vnode.data.directives, vnode.context)

  const dirsWithInsert: any[] = []
  const dirsWithPostpatch: any[] = []

  let key, oldDir, dir
  for (key in newDirs) {
    oldDir = oldDirs[key]
    dir = newDirs[key]
    if (!oldDir) {
      // new directive, bind
      callHook(dir, 'bind', vnode, oldVnode)
      if (dir.def && dir.def.inserted) {
        dirsWithInsert.push(dir)
      }
    } else {
      // existing directive, update
      dir.oldValue = oldDir.value
      dir.oldArg = oldDir.arg
      callHook(dir, 'update', vnode, oldVnode)
      if (dir.def && dir.def.componentUpdated) {
        dirsWithPostpatch.push(dir)
      }
    }
  }

  if (dirsWithInsert.length) {
    const callInsert = () => {
      for (let i = 0; i < dirsWithInsert.length; i++) {
        callHook(dirsWithInsert[i], 'inserted', vnode, oldVnode)
      }
    }
    if (isCreate) {
      mergeVNodeHook(vnode, 'insert', callInsert)
    } else {
      callInsert()
    }
  }

  if (dirsWithPostpatch.length) {
    mergeVNodeHook(vnode, 'postpatch', () => {
      for (let i = 0; i < dirsWithPostpatch.length; i++) {
        callHook(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode)
      }
    })
  }

  if (!isCreate) {
    for (key in oldDirs) {
      if (!newDirs[key]) {
        // no longer present, unbind
        callHook(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy)
      }
    }
  }
}