Function enter

static/vuejs/vue.common.js:6367–6513

(vnode, toggleDisplay)

/*  */

function enter (vnode, toggleDisplay) {
  var el = vnode.elm;

  // call leave callback now
  if (el._leaveCb) {
    el._leaveCb.cancelled = true;
    el._leaveCb();
  }

  var data = resolveTransition(vnode.data.transition);
  if (!data) {
    return
  }

  /* istanbul ignore if */
  if (el._enterCb || el.nodeType !== 1) {
    return
  }

  var css = data.css;
  var type = data.type;
  var enterClass = data.enterClass;
  var enterToClass = data.enterToClass;
  var enterActiveClass = data.enterActiveClass;
  var appearClass = data.appearClass;
  var appearToClass = data.appearToClass;
  var appearActiveClass = data.appearActiveClass;
  var beforeEnter = data.beforeEnter;
  var enter = data.enter;
  var afterEnter = data.afterEnter;
  var enterCancelled = data.enterCancelled;
  var beforeAppear = data.beforeAppear;
  var appear = data.appear;
  var afterAppear = data.afterAppear;
  var appearCancelled = data.appearCancelled;
  var duration = data.duration;

  // activeInstance will always be the <transition> component managing this
  // transition. One edge case to check is when the <transition> is placed
  // as the root node of a child component. In that case we need to check
  // <transition>'s parent for appear check.
  var context = activeInstance;
  var transitionNode = activeInstance.$vnode;
  while (transitionNode && transitionNode.parent) {
    transitionNode = transitionNode.parent;
    context = transitionNode.context;
  }

  var isAppear = !context._isMounted || !vnode.isRootInsert;

  if (isAppear && !appear && appear !== '') {
    return
  }

  var startClass = isAppear && appearClass
    ? appearClass
    : enterClass;
  var activeClass = isAppear && appearActiveClass