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Javascript D3错误-未捕获类型错误:无法读取属性';儿童';未定义的_Javascript_Html_Json_D3.js - Fatal编程技术网

Javascript D3错误-未捕获类型错误:无法读取属性';儿童';未定义的

Javascript D3错误-未捕获类型错误:无法读取属性';儿童';未定义的,javascript,html,json,d3.js,Javascript,Html,Json,D3.js,我知道以前也回答过类似的问题,我在这里发帖之前也试过。我试图建立一个树状图,但得到了这个错误。我想它找不到“孩子们”,但我不明白为什么 下面是我的json。这是有效的 { "name": "flare", "children": [{ "name": "Animals & Pet Supplies", "children": [{ "name": "Live Animals" }, { "name": "Pet Supplies",

我知道以前也回答过类似的问题,我在这里发帖之前也试过。我试图建立一个树状图,但得到了这个错误。我想它找不到“孩子们”,但我不明白为什么

下面是我的json。这是有效的

{
"name": "flare",
"children": [{
    "name": "Animals & Pet Supplies",
    "children": [{
        "name": "Live Animals"
    }, {
        "name": "Pet Supplies",
        "children": [{
            "name": "Bird Supplies",
            "children": [{
                "name": "Bird Cages & Stands"
            }, {
                "name": "Bird Food"
            }, {
                "name": "Bird Ladders & Perches"
            }, {
                "name": "Bird Toys"
            }, {
                "name": "Bird Treats"
            }]
        }, {
            "name": "Cat Supplies"
        }]
    }]
}]
}

下面是html

<!DOCTYPE html>
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
      <link type="text/css" rel="stylesheet" href="style.css"/>
      <!--<script type="text/javascript" src="d3/d3.js"></script>
         <script type="text/javascript" src="d3/d3.layout.js"></script>-->
      <script src="http://d3js.org/d3.v3.min.js"></script>
      <style type="text/css">
         .node circle {
         cursor: pointer;
         fill: #fff;
         stroke: steelblue;
         stroke-width: 1.5px;
         }
         .node text {
         font-size: 11px;
         }
         path.link {
         fill: none;
         stroke: #ccc;
         stroke-width: 1.5px;
         }
      </style>
   </head>
   <body>
      <div id="body">
         <div id="footer">
            d3.layout.tree
            <div class="hint">click or option-click to expand or collapse</div>
         </div>
      </div>
      <script type="text/javascript">
         var m = [20, 120, 20, 120],
             w = 1280 - m[1] - m[3],
             h = 800 - m[0] - m[2],
             i = 0,
             root;

         var tree = d3.layout.tree()
             .size([h, w]);

         var diagonal = d3.svg.diagonal()
             .projection(function(d) { return [d.y, d.x]; });

         var vis = d3.select("#body").append("svg:svg")
             .attr("width", w + m[1] + m[3])
             .attr("height", h + m[0] + m[2])
           .append("svg:g")
             .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

         d3.json("flare_orig_reduced.json", function(json) {
           root = json;
           root.x0 = h / 2;
           root.y0 = 0;

           function toggleAll(d) {
             if (d.children) {
               d.children.forEach(toggleAll);
               toggle(d);
             }
           }

           // Initialize the display to show a few nodes.
           root.children.forEach(toggleAll);
           toggle(root.children[1]);
           toggle(root.children[1].children[2]);
           toggle(root.children[9]);
           toggle(root.children[9].children[0]);

           update(root);
         });

         function update(source) {
           var duration = d3.event && d3.event.altKey ? 5000 : 500;

           // Compute the new tree layout.
           var nodes = tree.nodes(root).reverse();

           // Normalize for fixed-depth.
           nodes.forEach(function(d) { d.y = d.depth * 180; });

           // Update the nodes…
           var node = vis.selectAll("g.node")
               .data(nodes, function(d) { return d.id || (d.id = ++i); });

           // Enter any new nodes at the parent's previous position.
           var nodeEnter = node.enter().append("svg:g")
               .attr("class", "node")
               .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
               .on("click", function(d) { toggle(d); update(d); });

           nodeEnter.append("svg:circle")
               .attr("r", 1e-6)
               .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

           nodeEnter.append("svg:text")
               .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
               .attr("dy", ".35em")
               .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
               .text(function(d) { return d.name; })
               .style("fill-opacity", 1e-6);

           // Transition nodes to their new position.
           var nodeUpdate = node.transition()
               .duration(duration)
               .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

           nodeUpdate.select("circle")
               .attr("r", 4.5)
               .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

           nodeUpdate.select("text")
               .style("fill-opacity", 1);

           // Transition exiting nodes to the parent's new position.
           var nodeExit = node.exit().transition()
               .duration(duration)
               .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
               .remove();

           nodeExit.select("circle")
               .attr("r", 1e-6);

           nodeExit.select("text")
               .style("fill-opacity", 1e-6);

           // Update the links…
           var link = vis.selectAll("path.link")
               .data(tree.links(nodes), function(d) { return d.target.id; });

           // Enter any new links at the parent's previous position.
           link.enter().insert("svg:path", "g")
               .attr("class", "link")
               .attr("d", function(d) {
                 var o = {x: source.x0, y: source.y0};
                 return diagonal({source: o, target: o});
               })
             .transition()
               .duration(duration)
               .attr("d", diagonal);

           // Transition links to their new position.
           link.transition()
               .duration(duration)
               .attr("d", diagonal);

           // Transition exiting nodes to the parent's new position.
           link.exit().transition()
               .duration(duration)
               .attr("d", function(d) {
                 var o = {x: source.x, y: source.y};
                 return diagonal({source: o, target: o});
               })
               .remove();

           // Stash the old positions for transition.
           nodes.forEach(function(d) {
             d.x0 = d.x;
             d.y0 = d.y;
           });
         }

         // Toggle children.
         function toggle (d) {
           if (d.children) {
             d._children = d.children;
             d.children = null;
           } else {
             d.children = d._children;
             d._children = null;
           }
         }


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

.节点圆{
光标:指针;
填充:#fff;
笔画:钢蓝;
笔划宽度:1.5px;
}
.节点文本{
字体大小:11px;
}
路径链接{
填充:无;
冲程:#ccc;
笔划宽度:1.5px;
}
d3.layout.tree
单击或选项单击以展开或折叠
var m=[20,120,20,120],
w=1280-m[1]-m[3],
h=800-m[0]-m[2],
i=0,
根;
var tree=d3.layout.tree()
.尺寸([h,w]);
var diagonal=d3.svg.diagonal()
.投影(函数(d){返回[d.y,d.x];});
var vis=d3.选择(#body”).追加(“svg:svg”)
.attr(“宽度”,w+m[1]+m[3])
.attr(“高度”,h+m[0]+m[2])
.append(“svg:g”)
.attr(“转换”、“平移”(+m[3]+”、“+m[0]+”));
d3.json(“flare_orig_reduced.json”),函数(json){
root=json;
root.x0=h/2;
root.y0=0;
函数toggleAll(d){
如果(d.儿童){
d、 儿童。forEach(toggleAll);
切换(d);
}
}
//初始化显示以显示几个节点。
根。子。forEach(toggleAll);
切换(root.children[1]);
切换(root.children[1].children[2]);
切换(root.children[9]);
切换(root.children[9].children[0]);
更新(根);
});
函数更新(源){
var持续时间=d3.event&&d3.event.altKey?5000:500;
//计算新的树布局。
var nodes=tree.nodes(root.reverse();
//为固定深度进行规格化。
forEach(函数(d){d.y=d.depth*180;});
//更新节点…
var node=vis.selectAll(“g.node”)
.data(节点,函数(d){返回d.id | |(d.id=++i)});
//在父节点的上一个位置输入任何新节点。
var nodeEnter=node.enter().append(“svg:g”)
.attr(“类”、“节点”)
.attr(“transform”,函数(d){return“translate”(“+source.y0+”,“+source.x0+”));})
.on(“单击”,函数(d){切换(d);更新(d);});
追加(“svg:circle”)
.attr(“r”,1e-6)
.style(“fill”,函数(d){return d._children?“lightsteelblue”:“fff”});
追加(“svg:text”)
.attr(“x”,函数(d){返回d.children | | d._children?-10:10;})
.attr(“dy”,“.35em”)
.attr(“文本锚定”,函数(d){return d.children | | d.| u children?“end”:“start”})
.text(函数(d){返回d.name;})
.样式(“填充不透明度”,1e-6);
//将节点转换到其新位置。
var nodeUpdate=node.transition()
.持续时间(持续时间)
.attr(“转换”,函数(d){return“translate”(+d.y+),“+d.x+”);});
节点更新。选择(“圆圈”)
.attr(“r”,4.5)
.style(“fill”,函数(d){return d._children?“lightsteelblue”:“fff”});
nodeUpdate.select(“文本”)
.样式(“填充不透明度”,1);
//将退出节点转换到父节点的新位置。
var nodeExit=node.exit().transition()
.持续时间(持续时间)
.attr(“transform”,函数(d){return“translate”(“+source.y+”,“+source.x+”)”);})
.remove();
nodeExit.select(“圆”)
.attr(“r”,1e-6);
nodeExit.select(“文本”)
.样式(“填充不透明度”,1e-6);
//更新链接…
var link=vis.selectAll(“path.link”)
.data(tree.links(节点),函数(d){return d.target.id;});
//在父对象的上一个位置输入任何新链接。
link.enter().insert(“svg:path”,“g”)
.attr(“类”、“链接”)
.attr(“d”,函数(d){
var o={x:source.x0,y:source.y0};
返回对角线({source:o,target:o});
})
.transition()
.持续时间(持续时间)
.attr(“d”,对角线);
//过渡链接到他们的新位置。
link.transition()
.持续时间(持续时间)
.attr(“d”,对角线);
//将退出节点转换到父节点的新位置。
link.exit().transition()
.持续时间(持续时间)
.attr(“d”,函数(d){
var o={x:source.x,y:source.y};
返回对角线({source:o,target:o});
})
.remove();
//将旧位置隐藏起来,以便过渡。
nodes.forEach(函数(d){
d、 x0=d.x;
d、 y0=d.y;
});
}
//切换儿童。
功能切换(d){
如果(d.儿童){
d、 _children=d.children;
d、 children=null;
}否则{
d、 儿童=d.\U儿童;
d、 _children=null;
}
}

非常感谢您的帮助。

您似乎希望显示最初打开的所有节点

你不需要写一篇有趣的文章
  function toggleAll(d) {
     if (d.children) {
       d.children.forEach(toggleAll);
       toggle(d);
     }
   }

   // Initialize the display to show a few nodes.
   root.children.forEach(toggleAll);
   toggle(root.children[1]);
   toggle(root.children[1].children[2]);
   toggle(root.children[9]);
   toggle(root.children[9].children[0]);