我正在使用d3.tree来创建我的树层次结构，我对这个lib比较新，所以我需要一些帮助。
var treeData = {{ data | safe }};
// Set the dimensions and margins of the diagram
var margin = {top: 30, right: 90, bottom: 30, left: 150},
width = $('#tree-container').width(),
height = $('#tree-container').height();
// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("#tree-container").append("svg")
.attr("width", width)
.attr("height", height)
.call(d3.zoom().on("zoom", function () {
svg.attr("transform", d3.event.transform)
}))
.append("g")
.attr("width", width)
.attr("height", height)
.attr("id", "place")
.attr("transform", "translate("
+ (width/2) + "," + margin.top + ")");
var i = 0,
duration = 750,
root;
// declares a tree layout and assigns the size
var treemap = d3.tree()
.nodeSize([70, 10]);
// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = 0;
root.y0 = width / 2;
// Collapse after the second level
root.children.forEach(collapse);
update(root);
// Collapse the node and all it's children
function collapse(d) {
if(d.children) {
d._children = d.children
d._children.forEach(collapse)
d.children = null
}
}
var nodes;
function update(source) {
// Assigns the x and y position for the nodes
var treeData = treemap(root);
// Compute the new tree layout.
nodes = treeData.descendants();
links = treeData.descendants().slice(1);
// Normalize for fixed-depth.
nodes.forEach(function(d){ //HERE
d.y = d.depth * 120;
});
// ****************** Nodes section ***************************
// Update the nodes...
var node = svg.selectAll('g.node')
.data(nodes, function(d) {return d.id || (d.id = ++i); });
// Enter any new modes at the parent's previous position.
var nodeEnter = node.enter().append('g')
.attr('class', 'node')
.attr("transform", function(d) {
return "translate(" + source.x0 + "," + source.y0 + ")";
});
// Add Circle for the nodes
nodeEnter.append('circle')
.attr('class', 'node')
.attr('id', function(d) { return "circle-"+d.data.name; })
.attr('r', 1e-6)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";// make text color appear read or as data.color
}).on('click', click);
// Add labels for the nodes
nodeEnter.append('text')
.attr("dy", "0.45em")
.attr("y", function(d) {
return d.children || d._children ? -13 : 13;
})
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start";
})
.attr("cursor", "pointer")
.text(function(d) { return d.data.name; })
.on("click", textClick);
// UPDATE
var nodeUpdate = nodeEnter.merge(node);
// Transition to the proper position for the node
nodeUpdate.transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
// Update the node attributes and style
nodeUpdate.select('circle.node')
.attr('r', 10)
.style("fill", function(d) { return d._children ? d.data.ncolor : "#fff"; }) // change color of inner circle
.style("stroke", function (d) { return d.data.ncolor; }) // changing color of outere circle
.attr('cursor', 'pointer');
// Remove any exiting nodes
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.x + "," + source.y + ")";
})
.remove();
// On exit reduce the node circles size to 0
nodeExit.select('circle')
.attr('r', 1e-6);
// On exit reduce the opacity of text labels
nodeExit.select('text')
.style('fill-opacity', 1e-6);
// ****************** links section ***************************
// Update the links...
var link = svg.selectAll('path.link')
.data(links, function(d) { return d.id; });
// Enter any new links at the parent's previous position.
var linkEnter = link.enter().insert('path', "g")
.attr("class", "link")
.style("stroke", function (d) { return d.data.color; }) // Place where color of previous link changes
.attr('d', function(d){
var o = {x: source.x0, y: source.y0};
return diagonal(o, o)
});
// UPDATE
var linkUpdate = linkEnter.merge(link);
// Transition back to the parent element position
linkUpdate.transition()
.duration(duration)
.attr('d', function(d){ return diagonal(d, d.parent) });
// Remove any exiting links
var linkExit = link.exit().transition()
.duration(duration)
.attr('d', function(d) {
var o = {x: source.x, y: source.y};
return diagonal(o, o)
})
.remove();
// Store the old positions for transition.
nodes.forEach(function(d){
d.x0 = d.x;
d.y0 = d.y;
});
// Creates a curved (diagonal) path from parent to the child nodes
function diagonal(s, d) {
path = "M" + s.x + "," + s.y +
"C" + (s.x + d.x) / 2 + " " + s.y + ","
+ (s.x + d.x) / 2 + " " + d.y + ","
+ d.x + " " + d.y;
return path
}
// Toggle children on click.
function click(d) {
conosle.log();
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
它确实有效，但我正在寻找的是将所有内容都放在观察窗口内的方法。就像有人点击节点一样，它会扩展，如果子节点溢出（走出窗外），我需要缩小，这样它们才会可见。希望有d3 jedi-master回答我:)））
答案 0 :(得分：0)
如果没有看到您的实际数据或代码的运行版本，这很难回答，但这是一个建议。当你这样做时：
var treemap = d3.tree()
.nodeSize([70, 10]);
您正在设置每个节点的大小，但不是整个布局。另外，根据API，
指定节点大小时，根节点始终位于⟨0,0⟩。
这是一个例子：我只是分叉了Bostock的树例子，设置了nodeSize，你可以看到节点在SVG之外：http://blockbuilder.org/anonymous/7a84944610c7e6b3b9ebf063977955c9
因此，可能的解决方案是使用size代替nodeSize：
var treemap = d3.tree()
.nodeSize([width, height]);
以下是使用size的原始树示例，用于比较：http://blockbuilder.org/mbostock/4339083