编辑时突出显示文本框

Question

继续Question ，如果我有一行当前正在编辑（通过状态），我如何保持输入文本框仅在编辑后突出显示并且即使在单击下一行后仍保持突出显示？

我的代码如下所示：

<table className="table-data">
 <tbody>
 <tr>
    <th>Name</th>
    <th>Age</th>
    <th>Class</th>
    <th>Section</th>
 </tr>   

 {  this.state.students.map((item,key) => {

    const editField = (value, index) => {

      // Clone students data before mutation
      const students = this.state.students.map(item => ({ ...item }))

      // Update field by index of current student
      students[key][index] = value

      // Trigger re-render
      this.setState({ students })
    }

   return (
    <tr key={key} className={ item.editing ? 'editing' : '' } onClick={()=> {

      // Clone students data before mutation
      const students = this.state.students.map(i => ({ ...i, editing : item.editing && i===item }))

      // Toggle editing flag of this current student (ie table row)
      students[key].editing = true; 

      // Trigger re-render
      this.setState({
        clientIsEditing:true, // This might not be needed ?
        students
      })
}
    }> 
    <td>{ item.editing ? <input value={item[1]} onChange={ e => editField(e.target.value, 1) } /> : <span>{item[1]}</span> }</td>    
    <td>{ item.editing ? <input value={item[2]} onChange={ e => editField(e.target.value, 2) } /> : <span>{item[2]}</span> }</td>    
    <td>{ item.editing ? <input value={item[3]} onChange={ e => editField(e.target.value, 3) } /> : <span>{item[3]}</span> }</td>  
    <td>{ item.editing ? <input value={item[4]} onChange={ e => editField(e.target.value, 4) } /> : <span>{item[4]}</span> }</td> 
    </tr>  )
  })
  }

  </tbody>
  </table>

Answer 1

有几种方法可以实现这一点 - 一种方法是跟踪每个学生字段的其他状态，以这种方式显示突出显示。一种可能是通过以下方式使用与当前解决方案类似的模式：

render() {
    return (<table className="table-data">
 <tbody>
 <tr>
    <th>Name</th>
    <th>Age</th>
    <th>Class</th>
    <th>Section</th>
 </tr>   

 {  this.state.students.map((item,key) => {

    const editField = (value, index) => {

      // Clone students data before mutation
      const students = this.state.students.map(item => ({ ...item }))

      // Update field by index of current student
      students[key][index] = value

      // Extend state for student to tract editing history per field
      students[key].edited = students[key].edited || []
      students[key].edited[index] = true

      // Trigger re-render
      this.setState({ students })
    }

    // Returns true if the field by index has been edited. This is used for styling the td
    const isEdited = (index) => {
        const students = this.state.students.map(item => ({ ...item }))
        return (students[key].edited && students[key].edited[index] === true)
   }

   // Apply 'editing' class to the cell if it has been previously edited
   return (
    <tr key={key} className={ item.editing ? 'editing' : '' } onClick={()=> {

      // Clone students data before mutation
      const students = this.state.students.map(i => ({ ...i, editing : item.editing && i===item }))

      // Toggle editing flag of this current student (ie table row)
      students[key].editing = true; 

      // Trigger re-render
      this.setState({
        clientIsEditing:true, // This might not be needed ?
        students
      })
}
    }> 
    <td className={ isEdited(1) ? 'edited' : '' } >{ item.editing ? <input value={item[1]} onChange={ e => editField(e.target.value, 1) } /> : <span>{item[1]}</span> }</td>    
    <td className={ isEdited(2) ? 'edited' : '' } >{ item.editing ? <input value={item[2]} onChange={ e => editField(e.target.value, 2) } /> : <span>{item[2]}</span> }</td>    
    <td className={ isEdited(3) ? 'edited' : '' } >{ item.editing ? <input value={item[3]} onChange={ e => editField(e.target.value, 3) } /> : <span>{item[3]}</span> }</td>  
    <td className={ isEdited(4) ? 'edited' : '' } >{ item.editing ? <input value={item[4]} onChange={ e => editField(e.target.value, 4) } /> : <span>{item[4]}</span> }</td> 
    </tr>  )
  })
  }

  </tbody>
  </table>)
  }

要完成此操作，您只需添加一个 CSS 选择器，如下所示：

https://jsfiddle.net/7uspaot5/

对于工作演示，please see this jsFiddle - 希望这会有所帮助！