D3 工具提示未在 React 组件中正确更新

Question

我花了很长时间制作这个代码片段来突出一个非常令人沮丧的问题，我运行使用 d3 并一起做出反应，特别是尝试根据组件状态动态更新工具提示。

首先是代码片段，我已尽力保持简短和完整（为简洁起见，您可以跳过 css。只需注意单选按钮组，并将鼠标悬停在图形组件):

class GraphComponent extends React.Component {

  constructor(props) { 
    super(props);
  }

  // Lifecycle Components
  drawGraph() {
    const { buttonName } = this.props;
    
    const myData = [
      {x:25, y:30, name:"tommy", age:"24"},
      {x:108, y:82, name:"joey", age:"21"},
      {x:92, y:107, name:"nicky", age:"23"},
      {x:185, y:50, name:"peter", age:"27"},
      {x:65, y:80, name:"mickie", age:"4"},
      {x:165, y:80, name:"gregie", age:"14"},
      {x:154, y:10, name:"tammie", age:"24"},
      {x:102, y:42, name:"benny", age:"29"}
    ]

    // var myD3tip = d3Tip()
    var myD3tip = d3.tip()
   .attr('class', 'd3-tip')
   .offset([-20,0])
   .html(d => `<p>D3 Tip: ${buttonName}: ${d[buttonName]}</p>`)

    console.log('buttonName outside mouseover', buttonName)
    const divToolTip = d3.select('div#myTooltip')
    const points = d3.select('#mySvg').select('g.points')
    points.call(myD3tip)
    points
      .selectAll('circle')
      .data(myData)
      .enter()
      .append('circle')
      .attr('cx', d => d.x)
      .attr('cy', d => d.y)
      .attr('r', 8)
      .attr('fill', 'blue')
      .on('mouseover', function(d) {
        myD3tip.show(d)
        console.log('buttonName in mouseover', buttonName)
        divToolTip
          .style('opacity', 1)
          .style('left', d3.mouse(this)[0] + 'px')
          .style('top', (d3.mouse(this)[1]) + 'px')
          .html(`<p>Div Tip: ${buttonName}: ${d[buttonName]}</p>`)
      })
      .on('mouseout', function(d) {
        myD3tip.hide(d)
        divToolTip
          .style('opacity', 0)
      })
  }
 componentDidUpdate() {
    this.drawGraph()
  }
  componentDidMount() {
    this.drawGraph()
  }
  
 render() {
   return (
      <svg id="mySvg">
        <g className="points" />
      </svg>
  )
 }
}

class GraphContainer extends React.Component {

 constructor(props) { 
  super(props);
    this.state = {
      ageOrName: "age"
    }
    
    this.handleChange = this.handleChange.bind(this);
 }

  handleChange = (event) => {
    this.setState({ ageOrName: event.target.value })
  }
   
 render() {
    
    const { ageOrName } = this.state;
    
    const ageOrNameOptions = ["age", "name"];
    const ageOrNameButtons = 
          <form>
            <div>
              {ageOrNameOptions.map((d, i) => {
                return (
                  <label key={i+d}>
                    <input 
                      type={"radio"}
                      value={ageOrNameOptions[i]}
                      checked={ageOrName === ageOrNameOptions[i]}
                      onChange={this.handleChange}
                      />
                    <span>{ageOrNameOptions[i]}</span>
                  </label>
                )
              })}
            </div>
          </form>;
    
   return (
   <div>
         {ageOrNameButtons}
        
         <GraphComponent
           buttonName={ageOrName}
         />
      </div>
  )
 }
}


ReactDOM.render(
  <GraphContainer />,
  document.getElementById('root')
);

/* Div ToolTip */
#myTooltip {
 opacity: 0;
 position: absolute;
 pointer-events: none;
 background-color: lightblue;

 line-height: 0.50;
 font-weight: bold;
 padding: 8px 8px;
 padding-bottom: 0px;
 border-radius: 10px;
 border: 2px solid #444;
 font-size: 0.9em;
}
/* ========== */



/* D3 ToolTip */
/* ========== */
.d3-tip {
  line-height: 0.50;
  font-weight: bold;
  padding: 8px 8px;
  padding-bottom: 0px;
  border-radius: 10px;
  border: 2px solid #444;
  font-size: 0.9em;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: #444;
  content: "BC";
  position: absolute;
  text-align: center;
}

/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
/* ========== */

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.2.0/umd/react.development.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.2.0/umd/react-dom.development.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-tip/0.8.0-alpha.1/d3-tip.js"></script>

<div id="root"> 
  <svg id="mySvg">
</div>
<div id="myTooltip"></div>

概览是这样的：

我有 2 个组件，一个容器组件和一个图形组件。容器组件具有 ageOrName 状态，以及一个带有 "age" 和 "name" 的单选按钮来更新此状态。然后容器组件将这个值传递给图形组件。

接收 ageOrName 作为 prop 的图形组件使用此 prop 更改工具提示中的文本。但是，它不起作用。为了绝对完整，我包含了 2! 个不同的工具提示：

使用 d3-tip 库创建的工具提示
自定义工具提示，从页面上的 div 创建

我有两个 console.logs() 来显示图形组件内 ageOrName 属性的值，我已经意识到一些非常令人担忧。 prop 的值是不同的 取决于我是否在 "on.mouseover" 调用中。我不知道为什么。

让这个工作对我的应用程序很重要，非常感谢任何对此的帮助！

编辑：几乎肯定会在 2 天内（现在想）悬赏这个问题。早点回答也会奖励。

Answer 1

即使在选择 name 输入后，{buttonName} 仍然选择 age 的主要原因是 mouseover 函数在第一次 drawGraph 调用期间绑定到圆圈，下次再次调用时，会出现 d3 update 逻辑，它不会添加 new 鼠标悬停事件到现有的圈子（基于新的{buttonName}。

我想出了 2 种方法来解决这个问题：

只需在鼠标悬停函数本身中获取当前 {buttonName}。方法如下：

.on('mouseover', function(d) {
   var { buttonName } = that.props;
   myD3tip.html(d => `<p>D3 Tip: ${buttonName}: ${d[buttonName]}</p>`).show(d);

class GraphComponent extends React.Component {

  constructor(props) { 
    super(props);
  }

  // Lifecycle Components
  drawGraph() {
    var that = this;

    const { buttonName } = this.props;
    
    const myData = [
      {x:25, y:30, name:"tommy", age:"24"},
      {x:108, y:82, name:"joey", age:"21"},
      {x:92, y:107, name:"nicky", age:"23"},
      {x:185, y:50, name:"peter", age:"27"},
      {x:65, y:80, name:"mickie", age:"4"},
      {x:165, y:80, name:"gregie", age:"14"},
      {x:154, y:10, name:"tammie", age:"24"},
      {x:102, y:42, name:"benny", age:"29"}
    ]

    // var myD3tip = d3Tip()
    var myD3tip = d3.tip()
   .attr('class', 'd3-tip')
   .offset([-20,0])
   .html(d => `<p>D3 Tip: ${buttonName}: ${d[buttonName]}</p>`)

    const divToolTip = d3.select('div#myTooltip')
    const points = d3.select('#mySvg').select('g.points')
    points.call(myD3tip)
    points
      .selectAll('circle')
      .data(myData)
      .enter()
      .append('circle')
      .attr('cx', d => d.x)
      .attr('cy', d => d.y)
      .attr('r', 8)
      .attr('fill', 'blue');
      
    d3.select('#mySvg').select('g.points').selectAll('circle') 
      .on('mouseover', function(d) {
       var { buttonName } = that.props;
        myD3tip.html(d => `<p>D3 Tip: ${buttonName}: ${d[buttonName]}</p>`).show(d);
        divToolTip
          .style('opacity', 1)
          .style('left', d3.mouse(this)[0] + 'px')
          .style('top', (d3.mouse(this)[1]) + 'px')
          .html(`<p>Div Tip: ${buttonName}: ${d[buttonName]}</p>`)
      })
      .on('mouseout', function(d) {
        myD3tip.hide(d)
        divToolTip
          .style('opacity', 0)
      })
  }
 componentDidUpdate() {
    this.drawGraph()
  }
  componentDidMount() {
    this.drawGraph()
  }
  
 render() {
   return (
      <svg id="mySvg">
        <g className="points" />
      </svg>
  )
 }
}

class GraphContainer extends React.Component {

 constructor(props) { 
  super(props);
    this.state = {
      ageOrName: "age"
    }
    
    this.handleChange = this.handleChange.bind(this);
 }

  handleChange = (event) => {
    this.setState({ ageOrName: event.target.value })
  }
   
 render() {
    
    const { ageOrName } = this.state;
    
    const ageOrNameOptions = ["age", "name"];
    const ageOrNameButtons = 
          <form>
            <div>
              {ageOrNameOptions.map((d, i) => {
                return (
                  <label key={i+d}>
                    <input 
                      type={"radio"}
                      value={ageOrNameOptions[i]}
                      checked={ageOrName === ageOrNameOptions[i]}
                      onChange={this.handleChange}
                      />
                    <span>{ageOrNameOptions[i]}</span>
                  </label>
                )
              })}
            </div>
          </form>;
    
   return (
   <div>
         {ageOrNameButtons}
        
         <GraphComponent
           buttonName={ageOrName}
         />
      </div>
  )
 }
}


ReactDOM.render(
  <GraphContainer />,
  document.getElementById('root')
);

/* Div ToolTip */
#myTooltip {
 opacity: 0;
 position: absolute;
 pointer-events: none;
 background-color: lightblue;

 line-height: 0.50;
 font-weight: bold;
 padding: 8px 8px;
 padding-bottom: 0px;
 border-radius: 10px;
 border: 2px solid #444;
 font-size: 0.9em;
}
/* ========== */



/* D3 ToolTip */
/* ========== */
.d3-tip {
  line-height: 0.50;
  font-weight: bold;
  padding: 8px 8px;
  padding-bottom: 0px;
  border-radius: 10px;
  border: 2px solid #444;
  font-size: 0.9em;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: #444;
  content: "BC";
  position: absolute;
  text-align: center;
}

/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
/* ========== */

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-tip/0.8.0-alpha.1/d3-tip.js"></script>

<div id="root"> 
  <svg id="mySvg"></svg>
</div>
<div id="myTooltip"></div>

在每个 drawGraph 调用期间绑定 mouseover 事件：（类似这样）

points.select('circle')
  ....
  .attr('fill', 'blue');

d3.select('#mySvg').select('g.points').selectAll('circle')
   .on('mouseover', function(d) {
   .....

class GraphComponent extends React.Component {

  constructor(props) { 
    super(props);
  }

  // Lifecycle Components
  drawGraph() {
    const { buttonName } = this.props;
    
    const myData = [
      {x:25, y:30, name:"tommy", age:"24"},
      {x:108, y:82, name:"joey", age:"21"},
      {x:92, y:107, name:"nicky", age:"23"},
      {x:185, y:50, name:"peter", age:"27"},
      {x:65, y:80, name:"mickie", age:"4"},
      {x:165, y:80, name:"gregie", age:"14"},
      {x:154, y:10, name:"tammie", age:"24"},
      {x:102, y:42, name:"benny", age:"29"}
    ]

    // var myD3tip = d3Tip()
    var myD3tip = d3.tip()
   .attr('class', 'd3-tip')
   .offset([-20,0])
      .html(d => `<p>D3 Tip: ${buttonName}: ${d[buttonName]}</p>`);

    const divToolTip = d3.select('div#myTooltip')
    const points = d3.select('#mySvg').select('g.points')
    points.call(myD3tip)
    points
      .selectAll('circle')
      .data(myData)
      .enter()
      .append('circle')
      .attr('cx', d => d.x)
      .attr('cy', d => d.y)
      .attr('r', 8)
      .attr('fill', 'blue');
      
    d3.select('#mySvg').select('g.points').selectAll('circle')
      .on('mouseover', function(d) {
        myD3tip.show(d)
        divToolTip
          .style('opacity', 1)
          .style('left', d3.mouse(this)[0] + 'px')
          .style('top', (d3.mouse(this)[1]) + 'px')
          .html(`<p>Div Tip: ${buttonName}: ${d[buttonName]}</p>`)
      })
      .on('mouseout', function(d) {
        myD3tip.hide(d)
        divToolTip
          .style('opacity', 0)
      })
  }
 componentDidUpdate() {
    this.drawGraph()
  }
  componentDidMount() {
    this.drawGraph()
  }
  
 render() {
   return (
      <svg id="mySvg">
        <g className="points" />
      </svg>
  )
 }
}

class GraphContainer extends React.Component {

 constructor(props) { 
  super(props);
    this.state = {
      ageOrName: "age"
    }
    
    this.handleChange = this.handleChange.bind(this);
 }

  handleChange = (event) => {
    this.setState({ ageOrName: event.target.value })
  }
   
 render() {
    
    const { ageOrName } = this.state;
    
    const ageOrNameOptions = ["age", "name"];
    const ageOrNameButtons = 
          <form>
            <div>
              {ageOrNameOptions.map((d, i) => {
                return (
                  <label key={i+d}>
                    <input 
                      type={"radio"}
                      value={ageOrNameOptions[i]}
                      checked={ageOrName === ageOrNameOptions[i]}
                      onChange={this.handleChange}
                      />
                    <span>{ageOrNameOptions[i]}</span>
                  </label>
                )
              })}
            </div>
          </form>;
    
   return (
   <div>
         {ageOrNameButtons}
        
         <GraphComponent
           buttonName={ageOrName}
         />
      </div>
  )
 }
}


ReactDOM.render(
  <GraphContainer />,
  document.getElementById('root')
);

/* Div ToolTip */
#myTooltip {
 opacity: 0;
 position: absolute;
 pointer-events: none;
 background-color: lightblue;

 line-height: 0.50;
 font-weight: bold;
 padding: 8px 8px;
 padding-bottom: 0px;
 border-radius: 10px;
 border: 2px solid #444;
 font-size: 0.9em;
}
/* ========== */



/* D3 ToolTip */
/* ========== */
.d3-tip {
  line-height: 0.50;
  font-weight: bold;
  padding: 8px 8px;
  padding-bottom: 0px;
  border-radius: 10px;
  border: 2px solid #444;
  font-size: 0.9em;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: #444;
  content: "BC";
  position: absolute;
  text-align: center;
}

/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
/* ========== */

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-tip/0.8.0-alpha.1/d3-tip.js"></script>

<div id="root"> 
  <svg id="mySvg"></svg>
</div>
<div id="myTooltip"></div>

（我个人会选择第一种方法）

希望这对您有所帮助。

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