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javascript - 在 D3 树中,如何以编程方式关闭选定深度的所有节点(例如仅孙子节点)(无需单击节点)

转载 作者:行者123 更新时间:2023-12-03 03:59:06 27 4
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这是一个例子。我也许可以在点击函数中弄清楚它,但我不确定从点击函数外部从根开始检查所有子项的最佳方法。谢谢

<!DOCTYPE html>
<meta charset="UTF-8">
<style>

.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}

.node text {
font: 12px sans-serif;
}

.link {
fill: none;
stroke: #ccc;
stroke-width: 2px;
}

</style>

<body>

<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<button onclick="collapseNodeAtDepth(2)">Close nodes at depth 2</button>
<script>

var treeData =
{
"name": "Top Level depth 0",
"children": [
{
"name": "Level 2: A depth 1",
"children": [
{ "name": "Son of A depth 2",
"children": [
{ "name": "grandson of A depth 3" },
{ "name": "grandaughter of A depth 3" }
]
},
{ "name": "Daughter of A depth 2" }
]
},
{ "name": "Level 2: B depth 1" }
]
};

// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

// 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("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate("
+ margin.left + "," + margin.top + ")");

var i = 0,
duration = 750,
root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;

// 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
}
}

function update(source) {

// Assigns the x and y position for the nodes
var treeData = treemap(root);

// Compute the new tree layout.
var nodes = treeData.descendants(),
links = treeData.descendants().slice(1);

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

// ****************** 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.y0 + "," + source.x0 + ")";
})
.on('click', click);

// Add Circle for the nodes
nodeEnter.append('circle')
.attr('class', 'node')
.attr('r', 1e-6)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});

// Add labels for the nodes
nodeEnter.append('text')
.attr("dy", ".35em")
.attr("x", function(d) {
return d.children || d._children ? -13 : 13;
})
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start";
})
.text(function(d) { return d.data.name; });

// 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.y + "," + d.x + ")";
});

// Update the node attributes and style
nodeUpdate.select('circle.node')
.attr('r', 10)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
})
.attr('cursor', 'pointer');


// Remove any exiting nodes
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.y + "," + source.x + ")";
})
.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")
.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.y} ${s.x}
C ${(s.y + d.y) / 2} ${s.x},
${(s.y + d.y) / 2} ${d.x},
${d.y} ${d.x}`

return path
}

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

function collapseNodeAtDepth(depth){
//
}
}

</script>

</body>

最佳答案

<!DOCTYPE html>
<meta charset="UTF-8">
<style>

.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}

.node text {
font: 12px sans-serif;
}

.link {
fill: none;
stroke: #ccc;
stroke-width: 2px;
}

</style>

<body>

<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<button onclick="collapseNodeAtDepth(2)">Close nodes at depth 2</button>
<script>

var treeData =
{
"name": "Top Level depth 0",
"children": [
{
"name": "Level 2: A depth 1",
"children": [
{ "name": "Son of A depth 2",
"children": [
{ "name": "grandson of A depth 3" },
{ "name": "grandaughter of A depth 3" }
]
},
{ "name": "Daughter of A depth 2" }
]
},
{ "name": "Level 2: B depth 1" }
]
};

// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

// 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("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate("
+ margin.left + "," + margin.top + ")");

var i = 0,
duration = 750,
root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;

// 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
}
}

function update(source) {

// Assigns the x and y position for the nodes
var treeData = treemap(root);

// Compute the new tree layout.
var nodes = treeData.descendants(),
links = treeData.descendants().slice(1);

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

// ****************** 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.y0 + "," + source.x0 + ")";
})
.on('click', click);

// Add Circle for the nodes
nodeEnter.append('circle')
.attr('class', 'node')
.attr('r', 1e-6)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});

// Add labels for the nodes
nodeEnter.append('text')
.attr("dy", ".35em")
.attr("x", function(d) {
return d.children || d._children ? -13 : 13;
})
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start";
})
.text(function(d) { return d.data.name; });

// 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.y + "," + d.x + ")";
});

// Update the node attributes and style
nodeUpdate.select('circle.node')
.attr('r', 10)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
})
.attr('cursor', 'pointer');


// Remove any exiting nodes
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.y + "," + source.x + ")";
})
.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")
.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.y} ${s.x}
C ${(s.y + d.y) / 2} ${s.x},
${(s.y + d.y) / 2} ${d.x},
${d.y} ${d.x}`

return path
}

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

collapse = function(node, depth) {
if(node.depth === depth) node._children = node.children || node._children;
if(node.depth < depth) node.children = node.children || node._children;
if(!node.children) return;
node.children.forEach(function(n){
collapse(n, depth);
});

};

collapseNodeAtDepth = function (depth){
collapse(root, depth);
update(root);
}
}

</script>

</body>

您可以从根开始进行深度优先搜索。请参阅折叠功能。

关于javascript - 在 D3 树中,如何以编程方式关闭选定深度的所有节点(例如仅孙子节点)(无需单击节点),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44810814/

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