Question

我喜欢泡泡排，在任何给定时间我都有6个泡泡。该数组有6个json对象。代码仅显示加载时首次添加的圆圈。但是当我修改数组时，我想删除第一个气泡并在行的右端添加一个气泡。我使用setInterval将一个元素插入到数组中进行测试。由于我记录了数组的状态，因此数组正在正常更改，但svg图形不会刷新。我只是不知道问题是重新使用createElementGroup（）还是如何在这种情况下删除节点（我看到常见的情况是使用exit（）d3方法，但我不知道在哪里在这个特殊的情况下实现它）。

此外，当我删除并添加元素时，我应该在哪里放置过渡以使其平滑？现场演示在这里：

http://codepen.io/juanf03/pen/BQyYBq（你可以点击气泡看它展开并显示数据，这样我就检查这是不是正确的节点）

代码：

//listener that will be executed on setIntervalCheck to update the graphic   
setInterval(function(){
  moveForwardOnBubbleList();
  createElementGroup();
  }, 100000);



var profile_pic_url="https://scontent.fsst1-2.fna.fbcdn.net/v/t1.0-9/13680856_103268503450198_1479797031996897052_n.jpg?oh=f43bced91822fb210c8be8a410825da9&oe=58D46460";

var dataset = [{unique_followers: 5, profile_pic:profile_pic_url}, {unique_followers: 10, profile_pic:profile_pic_url},{ unique_followers: 15, profile_pic:profile_pic_url}, { unique_followers: 20, profile_pic:profile_pic_url}, { unique_followers: 25, profile_pic:profile_pic_url}, {unique_followers: 40, profile_pic:profile_pic_url} ];

var w=600,h=600;

var svg=d3.select("body").append("svg")
                                  .attr("width",w)
                                  .attr("height",h);

//1st level:All circles group
var circlesGroup = svg.append("g").classed("general-group",true);
//2nd level: Group of circle and text
var elementGroup;

var circle;

var circleAttributes;
//create g's of existing data
createElementGroup();

elementGroup.on('click', function(d,i){
  var that=this;

  d3.selectAll('.element-group').each(function(d,i) {
    if(this.id!==that.id){
      d3.select(this).classed("selected",false);
    }
  });

  d3.select(this).classed("selected", !d3.select(this).classed("selected"));

  });

//adding circular background image to the circles
//var circlesSelection=svg.selectAll('circle');


function createElementGroup(){
  elementGroup = circlesGroup
  .selectAll('circle')
  .data(dataset)
  .enter()
  .append("g").classed("element-group",true);

  circle=elementGroup.append('circle');

  circleAttributes = circle
  .attr("r", 20)
  .attr("stroke","black")
  .attr("fill", "white")
  .classed("circle",true);

  //text to show
   elementGroup.append("text")
      .attr("text-anchor", "middle")
   .text(function(d) {
     return parseInt(d.unique_followers);
   })
     .style("pointer-events","none")
     .classed('tweet-number', true);

     //image to show as background

  //element group positioning for the text to be inside circle
  elementGroup.attr("transform", function(d,i){
    return "translate(" + (i*80+45) + "," + h/2 + ")"; 
});

  elementGroup.attr( "fill-opacity", 0 ).transition().duration(500).attr( "fill-opacity", 1 );
  elementGroup.attr("id", function(d, i) { return "c"+i; });


}

function addBubbleLast(){
    dataset.push({unique_followers: 40, profile_pic:profile_pic_url});
}

function removeFirstBubble(){
  dataset.shift();

}

function moveForwardOnBubbleList(){
  addBubbleLast();
  removeFirstBubble();
}



/*CSS*/
 body
        {
          /*padding-top: 50px;*/
          padding-left: 100px;
        }

        .tweet-number{
         opacity:0.25;
        }

        .circle{

        }


        .selected *{
          transform: scale(2);
          transition: all 0.5s ease, opacity 0.5s ease;
          opacity:1.0;
    }

编辑：在 Gerardo Furtado 的强烈建议之后修复了代码。我发布它以防有人遇到类似的问题：

//listener that will be executed on setIntervalCheck to update the graphic   
setInterval(function(){
  moveForwardOnBubbleList();
  createElementGroup();
  }, 6000);



var profile_pic_url="https://scontent.fsst1-2.fna.fbcdn.net/v/t1.0-9/13680856_103268503450198_1479797031996897052_n.jpg?oh=f43bced91822fb210c8be8a410825da9&oe=58D46460";

var dataset = [{unique_followers: 5, profile_pic:profile_pic_url}, {unique_followers: 10, profile_pic:profile_pic_url},{ unique_followers: 15, profile_pic:profile_pic_url}, { unique_followers: 20, profile_pic:profile_pic_url}, { unique_followers: 25, profile_pic:profile_pic_url}, {unique_followers: 40, profile_pic:profile_pic_url} ];

var w=900,h=600;

var svg=d3.select("body").append("svg")
                                  .attr("width",w)
                                  .attr("height",h);

//1st level:All circles group
var circlesGroup = svg.append("g").classed("general-group",true);
//2nd level: Group of circle and text
var elementGroup;

var circle;

var circleAttributes;
//create g's of existing data
createElementGroup();



//adding circular background image to the circles
//var circlesSelection=svg.selectAll('circle');


function createElementGroup(){
  elementGroup = circlesGroup
  .selectAll('.element-group')
  .data(dataset, function(d){ return d.unique_followers});
 //doesn't work the exit transition 
   var elementExit = elementGroup.exit().transition().duration(1000).style("opacity", 0).remove();

  var elementEnter = elementGroup.enter()
  .append("g").classed("element-group",true).style("opacity",0);

    elementEnter.merge(elementGroup).attr("transform", function(d,i){

   //option 1 generation by mod   
   if(i%2===0){   
    return "translate(" + (i*80+45) + "," + h/1.55 + ")"; 
   }else{
    return "translate(" + (i*80+45) + "," + h/1.45 + ")"; 

   }

  /*   
  //option 2 random
  var random= (Math.random() * (1.6 - 1.45) + 1.45).toFixed(4);

         return "translate(" + (i*80+45) + "," + h/random + ")";*/ 


}).transition().duration(2000).style("opacity", 1.0);

    circle=elementEnter.append('circle');



  circleAttributes = circle
  .attr("r", 20)
  .attr("stroke","black")
  .attr("fill", "white")
  .classed("circle",true);

  d3.selectAll('.element-group').on('click', function(d,i){
  var that=this;
  d3.selectAll('.element-group').each(function(d,i) {
    if(this.id!==that.id){
      d3.select(this).classed("selected",false);
    }
  });

  d3.select(this).classed("selected", !d3.select(this).classed("selected"));

  });

  //text to show
   var texts = elementEnter.append("text")
      .attr("text-anchor", "middle")
   .text(function(d) {
     return parseInt(d.unique_followers);
   })
     .style("pointer-events","none")
     .classed('tweet-number', true);

     //image to show as background

  //element group positioning for the text to be inside circle



}

function addBubbleLast(){

  var random=Math.floor(Math.random() * (40)) + 1;


    dataset.push({unique_followers: random, profile_pic:profile_pic_url});
}

function removeFirstBubble(){
  dataset.shift();

}

function moveForwardOnBubbleList(){
  addBubbleLast();
  removeFirstBubble();
}

//CSS

    body
    {
      /*padding-top: 50px;*/
      padding-left: 100px;
    }

    .tweet-number{
     opacity:0.25;
    }

    .circle{

    }

 .selected *{
      transform: scale(2);
      transition: all 0.5s ease;
      opacity:1.0;
}

.element-group *{
  transition: all 0.5s ease;
}

circle + text{
}

Answer 1

您需要“输入”，“退出”和“更新”选项。

首先，我们绑定数据（使用键功能）：

elementGroup = circlesGroup
    .selectAll('.element-group')
    .data(dataset, function(d){ return d.unique_followers});

然后，我们设置输入选择：

var elementEnter = elementGroup.enter()
    .append("g").classed("element-group",true);

现在这是一个重要的注意事项：由于这是D3 v4.x，您需要merge选项才能选择有效的更新：

elementEnter.merge(elementGroup).attr("transform", function(d,i){
    return "translate(" + (i*80+45) + "," + h/2 + ")"; 
});

最后，退出选择：

var elementExit = elementGroup.exit().remove();

以下是您的CodePen：http://codepen.io/anon/pen/Wobyem

D3.js：＆＃34;在飞行中＆＃34;添加到数组的元素不刷新svg图形

1 个答案: