我需要将鼠标悬停在 d3.js 生成的图表中的节点上时显示 HTML div 元素。主要目的是以结构化方式显示与悬停时节点相关的附加信息。该信息包含链接、图像和文本。下面是我为生成图形而编写的代码。它是静态图，用户可以在窗口框架内移动节点:
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.node.fixed {
border: 2px;
border-color: #foo;
}
.link {
stroke: #000;
fill: none;
stroke-width: 2px;
cursor: default;
}
.nodeLabel {
stroke: #000;
stroke-width: 1px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 1000,
height = 850;
var color = d3.scale.category20();
// A map from group ID to image URL.
var imageByGroup = {
"0": "./images/1.png",
"1": "./images/2.png",
"2": "./images/3.png",
"3": "./images/4.png",
"4": "./images/5.png",
"5": "./images/6.png",
"6": "./images/7.png",
"7": "./images/8.png",
"8": "./images/9.png"
};
var force = d3.layout.force()
.charge(-100)
.linkDistance(150)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.call(d3.behavior.zoom().on("zoom", redraw));
// Per-type markers, as they don't inherit styles.
svg.append("svg:defs").append("svg:marker")
.attr("id", 'end-arrow')
.attr("viewBox", "0 -5 10 10")
.attr("refX", 17)
.attr("refY", 0)
.attr("markerWidth", 7)
.attr("markerHeight", 7)
.attr("orient", "auto")
.append("svg:path")
.attr("d", "M5,0L0,-5L10,0L0,5L5,0")
.attr('fill', '#000');
d3.json("input.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style('marker-end', 'url(#end-arrow)');
var drag = force.drag()
.on("dragstart", dragstart);
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("g")
.attr("class", "node")
.call(drag);
node.append("image")
.attr("xlink:href", function(d) {return imageByGroup[d.group];})
.attr("x", -24)
.attr("y", -24)
.attr("width", 48)
.attr("height", 48);
node.append("text")
.attr("text-anchor", "middle")
.attr("dy",35)
.attr("class", "nodeLabel")
.text(function(d) { return d.name; });
node.append("title")
.text(function(d) { return d.id+"--"+d.name; });
node.on("click", function(d){//alert(d.name)
});
force.on("tick", function() {
node.attr("cx", function(d) { return Math.min(width,d.x); })
.attr("cy", function(d) { return Math.min(height,d.y); })
.attr("transform", function(d) { return "translate(" + Math.min(width,d.x)+ "," + Math.min(height,d.y) + ")"; });
link.attr("x1", function(d) { return Math.min(width,d.source.x); })
.attr("y1", function(d) { return Math.min(height,d.source.y); })
.attr("x2", function(d) { return Math.min(width,d.target.x); })
.attr("y2", function(d) { return Math.min(height,d.target.y); });
});
});
function redraw() {
svg.attr("transform", " scale(" + d3.event.scale + ")");
}
function dragstart(d) {
d.fixed = true;
d3.select(this).classed("fixed", true);
}
</script>
输入 JSON 文件是:
{
"nodes":[
{"id":0,"name":"n1","group":0,"x":50,"y":50,"fixed":true},
{"id":1,"name":"n2","group":0,"x":200,"y":140,"fixed":true},
{"id":2,"name":"n3","group":0,"x":200,"y":50,"fixed":true},
{"id":3,"name":"n4","group":0,"x":350,"y":50,"fixed":true}
],
"links":[
{"source":1,"target":3,"value":1},
{"source":0,"target":2,"value":1},
{"source":0,"target":1,"value":1},
{"source":2,"target":3,"value":1}
]
}
文本工具提示与上面的代码配合得很好，但我需要以如上所述的格式化方式显示更多图像和链接。
另外，如果您能让我知道我是否可以更改悬停时节点的图像以使其突出显示，那将会很有帮助。
最佳答案
您只需将操作与以下命令绑定(bind)即可:
node.on("mouseover", mouseover)
.on("mouseout", mouseout)
其中 mouseover 和 mouseout 是可以在参数中获取悬停节点的函数:
function mouseover(d) {
// d is the node object
// You can even get mouse position with this command
var mousePos = d3.mouse(this);
}
这本书"Interactive Data Visualization"还有一章解释了如何显示工具提示。
关于javascript - 在 D3 强制布局中的节点上显示鼠标悬停时的 div 元素，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18377059/