我有带缩放和悬停工具提示的d3折线图。Graph looks like this:
一切正常，请做一件事：当我将鼠标悬停在图形上，然后将鼠标拖出绘图时-X和Y轴消失。当鼠标放在图上时，轴再次出现。
document.addEventListener('DOMContentLoaded', function(e) {
var svg = d3.select("#chart"),
margin = {top: 20, right: 20, bottom: 110, left: 40},
margin2 = {top: 430, right: 20, bottom: 30, left: 40},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom,
height2 = +svg.attr("height") - margin2.top - margin2.bottom;
var parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S");
bisectDate = d3.bisector(function(d) { return d.created_at; }).left;
formatDate = d3.time.format("%Y-%m-%d %H:%M:%S");
var x = d3.scaleTime().range([0, width]),
x2 = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
y2 = d3.scaleLinear().range([height2, 0]);
var xAxis = d3.axisBottom(x),
xAxis2 = d3.axisBottom(x2),
yAxis = d3.axisLeft(y);
var brush = d3.brushX()
.extent([[0, 0], [width, height2]])
.on("brush end", brushed);
var zoom = d3.zoom()
.scaleExtent([1, Infinity])
.translateExtent([[0, 0], [width, height]])
.extent([[0, 0], [width, height]])
.on("zoom", zoomed);
var line = d3.line()
.x(function (d) { return x(d.created_at); })
.y(function (d) { return y(d.temp); });
var line2 = d3.line()
.x(function (d) { return x2(d.created_at); })
.y(function (d) { return y2(d.temp); });
var clip = svg.append("defs").append("svg:clipPath")
.attr("id", "clip")
.append("svg:rect")
.attr("width", width)
.attr("height", height)
.attr("x", 0)
.attr("y", 0);
var Line_chart = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("clip-path", "url(#clip)");
var focus = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var context = svg.append("g")
.attr("class", "context")
.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
var data = jsonfile
data.forEach(function(d){
d.created_at = parseDate(d.created_at);
d.temp = +d.temp;
});
x.domain(d3.extent(data, function(d) { return d.created_at; }));
y.domain([0, d3.max(data, function (d) { return d.temp; })]);
x2.domain(x.domain());
y2.domain(y.domain());
focus.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
focus.append("g")
.attr("class", "axis axis--y")
.call(yAxis);
Line_chart.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
context.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line2);
context.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
svg.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom)
.on("mouseover", function() { focus.style("display", null); })
.on("mouseout", function() { focus.style("display", "none"); })
.on("mousemove", mousemove);
focus.append("line")
.attr("class", "x")
.style("stroke", "blue")
.style("stroke-dasharray", "3,3")
.style("opacity", 0.5)
.attr("y1", 0)
.attr("y2", height);
// append the y line
focus.append("line")
.attr("class", "y")
.style("stroke", "blue")
.style("stroke-dasharray", "3,3")
.style("opacity", 0.5)
.attr("x1", width)
.attr("x2", width);
// append the circle at the intersection
focus.append("circle")
.attr("class", "y")
.style("fill", "none")
.style("stroke", "blue")
.attr("r", 4);
// place the value at the intersection
focus.append("text")
.attr("class", "y1")
.style("stroke", "white")
.style("stroke-width", "3.5px")
.style("opacity", 0.8)
.attr("dx", 8)
.attr("dy", "-.3em");
focus.append("text")
.attr("class", "y2")
.attr("dx", 8)
.attr("dy", "-.3em");
// place the date at the intersection
focus.append("text")
.attr("class", "y3")
.style("stroke", "white")
.style("stroke-width", "3.5px")
.style("opacity", 0.8)
.attr("dx", 8)
.attr("dy", "1em");
focus.append("text")
.attr("class", "y4")
.attr("dx", 8)
.attr("dy", "1em");
function mousemove() {
var x0 = x.invert(d3.mouse(this)[0]),
i = bisectDate(data, x0, 1),
d0 = data[i - 1],
d1 = data[i],
d = x0 - d0.created_at > d1.created_at - x0 ? d1 : d0;
focus.select("circle.y")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")");
focus.select("text.y1")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")")
.text(d.temp);
focus.select("text.y2")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")")
.text(d.temp);
focus.select("text.y3")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")")
.text(formatDate(d.created_at));
focus.select("text.y4")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")")
.text(formatDate(d.created_at));
focus.select(".x")
.attr("transform",
"translate(" + x(d.created_at) + "," +
y(d.temp) + ")")
.attr("y2", height - y(d.temp));
focus.select(".y")
.attr("transform",
"translate(" + width * -1 + "," +
y(d.temp) + ")")
.attr("x2", width + width);
}
console.log(data);
function brushed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
var s = d3.event.selection || x2.range();
x.domain(s.map(x2.invert, x2));
Line_chart.select(".line").attr("d", line);
focus.select(".axis--x").call(xAxis);
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
}
function zoomed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
var t = d3.event.transform;
x.domain(t.rescaleX(x2).domain());
Line_chart.select(".line").attr("d", line);
focus.select(".axis--x").call(xAxis);
context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}
});
没有必要确切地弄清楚这个问题，任何有关导致此问题的原因的想法都会得到赞赏。
答案 0 :(得分：0)
欢迎使用StackOverflow。我相信问题是因为您使用的是
.on("mouseover", function() { focus.style("display", null); })
.on("mouseout", function() { focus.style("display", "none"); })
这是在将鼠标移出时分配给焦点变量（在您的情况下包括轴）的所有内容都设置为display: none，而在您将所有内容都设置为null时。鼠标移到。这并不奇怪，只是被误解了。
不幸的是，不清楚您希望图形做什么，即您希望在问题中的鼠标移动时显示/消失的内容。另外，您还应该为用户提供一些虚拟/样本数据，以重现您的问题。
如果您使用有关您想要的更多详细信息和一些示例数据来更新问题，我可以再为您看一下。更新信息后，只需在下面留下评论。
更新
基于以下注释：如果您想将轴与焦点分开，只需将其分配给其他变量即可。例如：
声明一个变量并为轴添加一个单独的组：
var axisg = svg.append("g") //appends a new group for the axis
.attr("class", "axisg") //assign it a class
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); // move it appropriately with the margins.
下一步，而不是将轴组件附加到focus变量中，而是将它们分配给axisg变量：
//append the x and y axis components
axisg.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
axisg.append("g")
.attr("class", "axis axis--y")
.call(yAxis);