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資料視覺化 D3.js實現力導向圖之二(node帶文字說明和提示)

從官方下載下的demo,直接加text帶文字,始終未能顯示出來,但是title卻能顯示出來,最後經過與網上其他地方做出來的例子用firebug進行跟蹤對比,發現能夠正確顯示title的html裡邊g標籤為node裡邊包含circle和text(circle、title和text是平級的),而官方下載下來的demo裡邊circle包含著text和title,於是把append(“circle”)移到  call(force.drag);之後,用node直接append(“circle”),這樣就能正確的顯示出text來了(text和circle也是平級的了).

程式碼如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> New Document </title>
  <style>
/*
.node {
  stroke: #ffffff;
  stroke-width: 0.1px;
}
*/
.link {
  stroke: #999;
  stroke-opacity: .6;
}

</style>
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
 </head>

<body>
<script src="d3.min.js"></script>
<script>

var width = 960,
    height = 500;

var colors = d3.scale.category20();

var force = d3.layout.force()
    .charge(-320)
    .linkDistance(100)
    .size([width, height]);

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

d3.json("miserables1.json", function(error, graph) {
  force
      .nodes(graph.nodes)
      .links(graph.links)
      .on("tick", tick)
      .start();

  var link = svg.selectAll(".link")
      .data(graph.links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });

  var node = svg.selectAll(".node")
      .data(graph.nodes)
    .enter().append("g")
      .attr("class", "node")
      .call(force.drag);

node.append("circle")
      .attr("r", 10)
      .style("fill", function(d) { return colors(d.group); });

 
 node.append("title")
      .text(function(d) { return d.name});
 node.append("text")
    .attr("x", 12)
    .attr("dy", ".35em")
    .text(function(d) { return d.name; });
      

  /*force.on("tick", function() {
    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });
    node
      .attr("transform", function(d) {
              return "translate(" + d.x + "," + d.y + ")";
      });
  });*/
  function tick() {//打點更新座標
  link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });

  node
      .attr("transform", function(d) {
              return "translate(" + d.x + "," + d.y + ")";
      });
}

});

</script>
</body>
</html>

=================json測試資料================================

{
  "nodes":[
    {"name":"11","group":1},
    {"name":"12","group":2},
    {"name":"21","group":3},
    {"name":"22","group":4},
    {"name":"23","group":5}
  ],
  "links":[
    {"source":1,"target":2,"value":1},
    {"source":1,"target":3,"value":1}
  ]
}