updateClass() — vue Function Reference

Architecture documentation for the updateClass() function in class.ts from the vue codebase.

Function typescript WebPlatform RuntimeModules

Entity Profile

WebPlatform→ RuntimeModules→ updateClass() — vue Function Reference

Dependency Diagram

graph TD
  c27ad0d9_99e7_a4bc_849f_09668734a95f["updateClass()"]
  8fdc3f66_a6b3_ca41_84c0_e583884cca12["class.ts"]
  c27ad0d9_99e7_a4bc_849f_09668734a95f -->|defined in| 8fdc3f66_a6b3_ca41_84c0_e583884cca12
  style c27ad0d9_99e7_a4bc_849f_09668734a95f fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/platforms/web/runtime/modules/class.ts lines 6–32

function updateClass(oldVnode: any, vnode: any) {
  const el = vnode.elm
  const data: VNodeData = vnode.data
  const oldData: VNodeData = oldVnode.data
  if (
    isUndef(data.staticClass) &&
    isUndef(data.class) &&
    (isUndef(oldData) ||
      (isUndef(oldData.staticClass) && isUndef(oldData.class)))
  ) {
    return
  }

  let cls = genClassForVnode(vnode)

  // handle transition classes
  const transitionClass = el._transitionClasses
  if (isDef(transitionClass)) {
    cls = concat(cls, stringifyClass(transitionClass))
  }

  // set the class
  if (cls !== el._prevClass) {
    el.setAttribute('class', cls)
    el._prevClass = cls
  }
}