all files / internal/ expandTransition.vue

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export default {
  methods: {
    beforeEnter (el) {
      el.dataset.oldPaddingTop = el.style.paddingTop
      el.dataset.oldPaddingBottom = el.style.paddingBottom
      el.style.height = '0'
      el.style.paddingTop = 0
      el.style.paddingBottom = 0
    },
    enter (el) {
      el.dataset.oldOverflow = el.style.overflow
 
      el.style.display = 'block'
      if (el.scrollHeight !== 0) {
        el.style.height = el.scrollHeight + 'px'
        // el.style.paddingTop = el.dataset.oldPaddingTop
        // el.style.paddingBottom = el.dataset.oldPaddingBottom
      } else {
        el.style.height = ''
        el.style.paddingTop = el.dataset.oldPaddingTop
        el.style.paddingBottom = el.dataset.oldPaddingBottom
      }
      el.style.overflow = 'hidden'
    },
    afterEnter (el) {
      el.style.display = ''
      // uc浏览器上设置height会闪屏
      // el.style.height = 'auto'
      el.style.overflow = el.dataset.oldOverflow
    },
    beforeLeave (el) {
      el.dataset.oldPaddingTop = el.style.paddingTop
      el.dataset.oldPaddingBottom = el.style.paddingBottom
      el.dataset.oldOverflow = el.style.overflow
 
      el.style.display = 'block'
      if (el.scrollHeight !== 0) {
        el.style.height = el.scrollHeight + 'px'
      }
      el.style.overflow = 'hidden'
    },
    leave (el) {
      if (el.scrollHeight !== 0) {
        setTimeout(() => {
          el.style.height = 0
          el.style.paddingTop = 0
          el.style.paddingBottom = 0
        })
      }
    },
    afterLeave (el) {
      el.style.display = 'none'
      el.style.height = ''
      el.style.overflow = el.dataset.oldOverflow
      el.style.paddingTop = el.dataset.oldPaddingTop
      el.style.paddingBottom = el.dataset.oldPaddingBottom
    }
  }
}