警告:input是一个void元素标记,不能有`children`或使用`props.dangerouslySetInnerHTML`.检查render方法为null

Question

如果对表单URL的ajax调用失败,我试图在表单中呈现错误.以下是我的Admin组件:

#app/assets/javascripts/components/admin.js.coffee
@Admin = React.createClass
#  propTypes: ->
#    emailVal: React.PropTypes.string.isRequired

  getInitialState: ->
    edit: false
    errorTexts: []

  handleToggle: (e) ->
    e.preventDefault()
    @setState edit: !@state.edit
    @setState errorTexts: []

  handleDelete: (e) ->
    e.preventDefault()
    # yeah... jQuery doesn't have a $.delete shortcut method
    $.ajax
      method: 'DELETE'
      url: "/admins/#{ @props.admin.id }"
      dataType: 'JSON'
      success: () =>
        @props.handleDeleteAdmin @props.admins

  handleEdit: (e) ->
    e.preventDefault()
    data = email: ReactDOM.findDOMNode(@refs.email).value
    # jQuery doesn't have a $.put shortcut method either
    $.ajax
      method: 'PUT'
      async: false
      url: "/admins/#{ @props.admin.id }"
      dataType: 'JSON'
      data:
        admin: data
      error: (data, status, xhr) =>
        errorTexts = []
        for key, value of data.responseJSON
          errorText = "#{key} #{value.toString()}"
          errorTexts.push errorText
        @replaceState errorTexts: errorTexts
        @setState edit: true
      success: (data, status, xhr) =>
        @setState edit: false
        @props.handleEditAdmin @props.admin, data

  adminRow: ->
    dom.tr null,
      dom.td null, @props.admin.email
      dom.td null,
        dom.a
          className: 'btn btn-default'
          onClick: @handleToggle
          'Edit'
        dom.a
          className: 'btn btn-danger'
          onClick: @handleDelete
          'Delete'

  adminForm: ->
    dom.tr null,
      dom.td null,
        dom.input
          className: 'form-control'
          type: 'text'
          defaultValue: @props.admin.email
          ref: 'email'
          for errorText, index in @state.errorTexts
            React.createElement AdminError, key: index, errorText: errorText
      dom.td null,
        dom.a
          className: 'btn btn-default'
          onClick: @handleEdit
          'Update'
        dom.a
          className: 'btn btn-danger'
          onClick: @handleToggle
          'Cancel'

  render: ->
    if @state.edit
      @adminForm()
    else
      @adminRow()

相应的AdminError组成部分是:

#app/assets/javascripts/components/adminerror.js.coffee
@AdminError = React.createClass

  getDefaultProps: ->
    errorText: ""

  render: ->
    dom.div
      className: 'help-block'
      @props.errorText

在调试时,我得到@ props.errorText的正确值为"email is invalid".但它没有在页面上呈现,我在控制台中发出警告:"警告:输入是一个void元素标记,不能有children或使用props.dangerouslySetInnerHTML.检查渲染方法为null." 附件是错误和页面的屏幕截图.

我尝试更改AdminError组件,如下所示,但它不起作用:

#app/assets/javascripts/components/adminerror.js.coffee
@AdminError = React.createClass

  getDefaultProps: ->
    errorText: ""

  render: ->
    dom.div
      className: 'help-block'
      dangerouslySetInnerHTML: __html: marked(@props.errorText.toString(), {saitize: true})

当我在返回dangerouslySetInnerHTML的行设置调试点时,我正确地得到@props.errorText"电子邮件无效"的值,值为marked(@props.errorText.toString())"

电子邮件无效

"..但仍然没有提供错误的帮助块.

更新: 在AdminError组件中进行了以下更改

应用程序/资产/ Java脚本/组件/ adminerror.js.coffee

@AdminError = React.createClass

  getDefaultProps: ->
#    errorText: ""
    errorTexts: []

  render: ->
    for errorText in @props.errorTexts
      dom.div
        className: 'help-block'
        errorText

在Admin组件中,对adminform方法进行了以下更改:

if(@state.errorTexts.length>0)
            dangerouslySetInnerHTML: {
              __html: ReactDOMServer.renderToString(
  #              for errorText, index in @state.errorTexts
                React.createElement AdminError, errorTexts: @state.errorTexts
              )
            }

没有得到警告,而是得到以下错误:

Uncaught Invariant Violation: ReactCompositeComponent.render(): A valid ReactComponent must be returned. You may have returned undefined, an array or some other invalid object.

Answer 1

警告:输入是一个void元素标记,不能有children......

A dom.input 可能没有子元素.

但是这段代码试图将错误消息呈现为dom.input:

  dom.td null,
    dom.input
      className: 'form-control'
      type: 'text'
      defaultValue: @props.admin.email
      ref: 'email'
      # These are being rendered as children of the input: 
      for errorText, index in @state.errorTexts
        React.createElement AdminError, key: index, errorText: errorText

你能在其他地方呈现这些错误消息吗？例如,作为输入的兄弟姐妹:

  dom.td null,
    dom.input
      className: 'form-control'
      type: 'text'
      defaultValue: @props.admin.email
      ref: 'email'
    for errorText, index in @state.errorTexts
      React.createElement AdminError, key: index, errorText: errorText