Javascript 在饼图中使用鼠标悬停并在d3 js中显示标签
您好,我是d3js新手,因此我无法在饼图的给定代码中使用鼠标悬停事件…我有一个id为Javascript 在饼图中使用鼠标悬停并在d3 js中显示标签,javascript,d3.js,Javascript,D3.js,您好,我是d3js新手,因此我无法在饼图的给定代码中使用鼠标悬停事件…我有一个id为的,名为图表,因此如何创建鼠标悬停事件的类并显示标签 下面是我用来绘制饼图的代码: var w = 300; var h = 300; var dataset = [ {"year":"2017-07-01","value":"5"}, {"year":"2017-07-02","value":"10"}, {"year":"2017-07-03","value":"15"}, {"year"
的
,名为图表
,因此如何创建鼠标悬停事件的类并显示标签
下面是我用来绘制饼图的代码:
var w = 300;
var h = 300;
var dataset = [
{"year":"2017-07-01","value":"5"},
{"year":"2017-07-02","value":"10"},
{"year":"2017-07-03","value":"15"},
{"year":"2017-07-04","value":"20"},
{"year":"2017-07-05","value":"25"},
{"year":"2017-07-06","value":"30"},
{"year":"2017-07-07","value":"35"},
{"year":"2017-07-08","value":"40"},
{"year":"2017-07-09","value":"45"},
{"year":"2017-07-10","value":"50"},
{"year":"2017-07-11","value":"55"},
{"year":"2017-07-12","value":"60"},
{"year":"2017-07-13","value":"65"},
{"year":"2017-07-14","value":"70"}
];
var outerRadius = w / 2;
var innerRadius = 0;
var arc = d3.svg.arc()
.innerRadius(innerRadius)
.outerRadius(outerRadius);
var pie = d3.layout.pie()
.value(function(d) {
return d.value;
});
var color = d3.scale.category20();
var svg = d3.select("#chart")
.append("svg")
.attr("width", w)
.attr("height", h);
var arcs = svg.selectAll("g.arc")
.data(pie(dataset))
.enter()
.append("g")
.attr("class", "arc")
.attr("transform", "translate(" + outerRadius + "," + outerRadius + ")");
arcs.append("path")
.attr("fill", function(d, i) {
return color(i);
})
.attr("d", arc);
arcs.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("text-anchor", "middle")
.text(function(d) {
return d.value;
});
我假设您想要的是工具提示。最简单的方法是在每个圆上附加一个svg:title元素,因为浏览器将负责显示工具提示,而您不需要鼠标手柄。代码类似于
vis.selectAll(“圆圈”)
.data(数据过滤).enter().append(“svg:circle”)
...
.append(“svg:title”)
.text(函数(d){return d.x;});
如果您想要更丰富的工具提示,可以使用tipsy作为示例。请参见此处以获取示例。在HTML中添加样式
<style>
#chart {
height: 360px;
position: relative;
width: 360px;
}
.tooltip {
background: #eee;
box-shadow: 0 0 5px #999999;
color: #333;
display: none;
font-size: 12px;
left: 130px;
padding: 10px;
position: absolute;
text-align: center;
top: 95px;
width: 80px;
z-index: 10;
}
.legend {
font-size: 12px;
}
rect {
stroke-width: 2;
}
</style>
我希望这对你有帮助。您可能需要解决这个问题,这取决于您希望如何显示工具提示以及如何在图表中填充数据
var width = 360;
var height = 360;
var radius = Math.min(width, height) / 2;
var donutWidth = 75;
var legendRectSize = 18;
var legendSpacing = 4;
var color = d3.scale.category20b();
var svg = d3.select('#chart')
.append('svg')
.attr('width', width)
.attr('height', height)
.append('g')
.attr('transform', 'translate(' + (width / 2) +
',' + (height / 2) + ')');
var arc = d3.svg.arc()
.innerRadius(radius - donutWidth)
.outerRadius(radius);
var pie = d3.layout.pie()
.value(function(d) { return d.count; })
.sort(null);
var tooltip = d3.select('#chart')
.append('div')
.attr('class', 'tooltip');
tooltip.append('div')
.attr('class', 'label');
tooltip.append('div')
.attr('class', 'count');
tooltip.append('div')
.attr('class', 'percent');
var path = svg.selectAll('path')
.data(pie(dataset))
.enter()
.append('path')
.attr('d', arc)
.attr('fill', function(d, i) {
return color(d.data.label);
});
path.on('mouseover', function(d) {
var total = d3.sum(dataset.map(function(d) {
return d.count;
}));
var percent = Math.round(1000 * d.data.count / total) / 10;
tooltip.select('.label').html(d.data.label);
tooltip.select('.count').html(d.data.count);
tooltip.select('.percent').html(percent + '%');
tooltip.style('display', 'block');
});
path.on('mouseout', function() {
tooltip.style('display', 'none');
});
var legend = svg.selectAll('.legend')
.data(color.domain())
.enter()
.append('g')
.attr('class', 'legend')
.attr('transform', function(d, i) {
var height = legendRectSize + legendSpacing;
var offset = height * color.domain().length / 2;
var horz = -2 * legendRectSize;
var vert = i * height - offset;
return 'translate(' + horz + ',' + vert + ')';
});
legend.append('rect')
.attr('width', legendRectSize)
.attr('height', legendRectSize)
.style('fill', color)
.style('stroke', color);
legend.append('text')
.attr('x', legendRectSize + legendSpacing)
.attr('y', legendRectSize - legendSpacing)
.text(function(d) { return d; });