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时间:2017-02-12 11:43:15

标签: javascript json ajax d3.js

这一整天我都尝试为我的用例做这个(https://bl.ocks.org/mbostock/7607535)工作。在前面提到的页面中,作者将数据保存为JSON,但我希望允许用户对JSON进行更改。

我正在构建一个工具,允许用户将他或她感兴趣的国家/地区输入到表单中。我发出ajax请求以获取此表单的信息,然后将其传递给Flask,以便Flask可以查询我的Cassandra数据库。一旦Flask查询我的Cassandra数据库,它就会将信息发送回我的A​​JAX请求。一旦我掌握了AJAX中的信息,我就会尝试更新当前的字典,以便用户选择的国家/地区显示另一个气泡,但这不起作用。我能够为第一个条目制作正确的图表,但是一旦用户输入第二个条目,我的图表就会搞砸了。要查看发生的情况,请在此处查看我的网站:http://ec2-52-27-239-181.us-west-2.compute.amazonaws.com/overview

这是我目前的代码:

function add_simple(json,dict_country){ //updates the dictionary

  function event_children(event_dict){ //returns a list with event children
    var time_lst = []
    var event_names = Object.keys(event_dict)
    for (var i = 0; i<event_names.length; i++){
      var event_type = {}
      event_type["name"] = event_names[i]
      event_type["children"] = []
      event_info = event_dict[event_names[i]]
      for (var key in event_info){
        key_obj = {}
        key_obj["name"] = key + " => " + event_info[key]
        key_obj["size"] = 2000
        event_type["children"].push(key_obj)
      }
      time_lst.push(event_type)
    }
    return time_lst
  }

  var country = dict_country["Country"]
  var timeframe = dict_country["Timeframe"]
  var date = dict_country["Date"]
  var total = dict_country["Total"]
  var info = dict_country["Overview"]
  json["children"].push({"name":country,"children":event_children(info)})
  return json
}


var poot = {"name":"flare","children":[]}
$( "#target" ).click(function() {
             var data = {};
             data.country = $("#country").val();
             data.timeframe = $("#timeframe").val();
             data.eventdate = $("#eventdate").val();
             $.ajax({
                type : "POST",
                url : "/overview",
                data: JSON.stringify(data, null, '\t'),
                contentType: 'application/json;charset=UTF-8',
                success: function(result) {
                   poot = add_simple(poot,result["result"])
           console.log(poot)
           createCircles(poot);
                }
              });
             })


var svg = d3.select("svg"),
  margin = 20,
  diameter = +svg.attr("width"),
  g = svg.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");

var color = d3.scaleLinear()
  .domain([-1, 5])
  .range(["hsl(152,80%,80%)", "hsl(228,30%,40%)"])
  .interpolate(d3.interpolateHcl);

var pack = d3.pack()
  .size([diameter - margin, diameter - margin])
  .padding(2);

function createCircles(root){
root = d3.hierarchy(root)
    .sum(function(d) { return d.size; })
    .sort(function(a, b) { return b.value - a.value; });

var focus = root,
    nodes = pack(root).descendants(),
    view;

var circle = g.selectAll("circle")
  .data(nodes)
  .enter().append("circle")
    .attr("class", function(d) { return d.parent ? d.children ? "node" : "node node--leaf" : "node node--root"; })
    .style("fill", function(d) { return d.children ? color(d.depth) : null; })
    .on("click", function(d) { if (focus !== d) zoom(d), d3.event.stopPropagation(); });

var text = g.selectAll("text")
  .data(nodes)
  .enter().append("text")
    .attr("class", "label")
    .style("fill-opacity", function(d) { return d.parent === root ? 1 : 0; })
    .style("display", function(d) { return d.parent === root ? "inline" : "none"; })
    .text(function(d) { return d.data.name; });

var node = g.selectAll("circle,text");

svg
    .style("background", color(-1))
    .on("click", function() { zoom(root); });

zoomTo([root.x, root.y, root.r * 2 + margin]);

function zoom(d) {
  var focus0 = focus; focus = d;

  var transition = d3.transition()
      .duration(d3.event.altKey ? 7500 : 750)
      .tween("zoom", function(d) {
        var i = d3.interpolateZoom(view, [focus.x, focus.y, focus.r * 2 + margin]);
        return function(t) { zoomTo(i(t)); };
      });

  transition.selectAll("text")
    .filter(function(d) { return d.parent === focus || this.style.display === "inline"; })
      .style("fill-opacity", function(d) { return d.parent === focus ? 1 : 0; })
      .on("start", function(d) { if (d.parent === focus) this.style.display = "inline"; })
      .on("end", function(d) { if (d.parent !== focus) this.style.display = "none"; });
}

function zoomTo(v) {
  var k = diameter / v[2]; view = v;
  node.attr("transform", function(d) { return "translate(" + (d.x - v[0]) * k + "," + (d.y - v[1]) * k + ")"; });
  circle.attr("r", function(d) { return d.r * k; });
}
}
//});

我非常感谢任何帮助。

0 个答案:

没有答案