dom-props.ts — vue Source File

Source Code

import { isDef, isUndef, extend, toNumber, isTrue } from 'shared/util'
import type { VNodeWithData } from 'types/vnode'
import { isSVG } from 'web/util/index'

let svgContainer

function updateDOMProps(oldVnode: VNodeWithData, vnode: VNodeWithData) {
  if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
    return
  }
  let key, cur
  const elm: any = vnode.elm
  const oldProps = oldVnode.data.domProps || {}
  let props = vnode.data.domProps || {}
  // clone observed objects, as the user probably wants to mutate it
  if (isDef(props.__ob__) || isTrue(props._v_attr_proxy)) {
    props = vnode.data.domProps = extend({}, props)
  }

  for (key in oldProps) {
    if (!(key in props)) {
      elm[key] = ''
    }
  }

  for (key in props) {
    cur = props[key]
    // ignore children if the node has textContent or innerHTML,
    // as these will throw away existing DOM nodes and cause removal errors
    // on subsequent patches (#3360)
    if (key === 'textContent' || key === 'innerHTML') {
      if (vnode.children) vnode.children.length = 0
      if (cur === oldProps[key]) continue
      // #6601 work around Chrome version <= 55 bug where single textNode
      // replaced by innerHTML/textContent retains its parentNode property
      if (elm.childNodes.length === 1) {
        elm.removeChild(elm.childNodes[0])
      }
    }

    if (key === 'value' && elm.tagName !== 'PROGRESS') {
      // store value as _value as well since
      // non-string values will be stringified
      elm._value = cur
      // avoid resetting cursor position when value is the same
      const strCur = isUndef(cur) ? '' : String(cur)
      if (shouldUpdateValue(elm, strCur)) {
        elm.value = strCur
      }
    } else if (
      key === 'innerHTML' &&
      isSVG(elm.tagName) &&
      isUndef(elm.innerHTML)
    ) {
      // IE doesn't support innerHTML for SVG elements
      svgContainer = svgContainer || document.createElement('div')
      svgContainer.innerHTML = `<svg>${cur}</svg>`
      const svg = svgContainer.firstChild
      while (elm.firstChild) {
        elm.removeChild(elm.firstChild)
// ... (64 more lines)