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我一直在嘗試改編Mike Bostock的chained transition script來處理多條線路，但我沒有得到它的工作。第一次顯示後，線條和標籤飛出了陰謀，不再顯示了所有事情都得到了更新（我可以看到在檢查JavaScript控制檯時，線條的值會發生變化）。我不明白我做錯了什麼。我將在下面發佈（冗長的）代碼（對長度表示歉意）。我將不勝感激任何幫助，謝謝！如何在d3.js圖中轉換多行？
<!DOCTYPE html>
<head>
<title>Modified Chained Transitions</title>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v3.min.js"></script>
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
margin: auto;
position: relative;
width: 960px;
}
text {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
form {
position: absolute;
right: 10px;
top: 10px;
}
</style>
</head>
<body>
<br>
<button type="button"> Request data</button>
<div id='chart'> </div>
</body>
<script>
var margin = {top: 20, right: 80, bottom: 30, left: 50},
width = 750 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var parseDate = d3.time.format("%Y%m%d").parse;
var xScale = d3.time.scale()
.range([0, width]);
var yScale = d3.scale.linear()
.range([height, 0]);
var color = d3.scale.category10();
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
var line = d3.svg.line()
.interpolate("basis")
.x(function(d) { return xScale(d.date); })
.y(function(d) { return yScale(d.temperature); });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var getNewData = function() {
var data = [];
var counter = 0;
function generate(){
var startDate = new Date;
counter += 1;
var range = counter % 2 === 0 ? 10 : 100;
for (i = 0; i < 100; i++) {
data[i] = {"date": new Date(startDate - i),
"New York": Math.random() * (range - 1),
"San Francisco": Math.random() * (range - 1),
"Austin": Math.random() * (range - 10)};
}
return data;
}
return {
new: function() {return generate()}
};
}; // function getNewData()
var newData = getNewData();
data = newData.new();
color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));
var cities = color.domain().map(function(name) {
return {
name: name,
values: data.map(function(d) {
return { date: d.date, temperature: +d[name]};
})
};
});
xScale.domain(d3.extent(data, function(d) { return d.date; }));
yScale.domain([
d3.min(cities, function(c) {
return d3.min(c.values, function(v) { return v.temperature; }); }),
d3.max(cities, function(c) {
return d3.max(c.values, function(v) { return v.temperature; }); })
]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Temperature (ºF)");
var city = svg.selectAll(".city")
.data(cities)
.enter().append("g")
.attr("class", "city");
city.append("path")
.attr("class", "line")
.attr("d", function(d) { return line(d.values); })
.style("stroke", function(d) { return color(d.name); });
city.append("text")
.datum(function(d) { return {name: d.name, values: d.values[0]}; })
.attr("class", "label")
.attr("transform", function(d) { return "translate(" +
xScale(d.values.date) + "," + yScale(d.values.temperature) + ")"; })
.attr("x", 3)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
d3.selectAll("button").on("click", change);
function change() {
data = newData.new();
color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));
cities = color.domain().map(function(name) {
return {
name: name,
values: data.map(function(d) {
return { date: d.date, temperature: +d[name]};
})
};
});
console.log(cities[0].values[0]);
xScale.domain(d3.extent(data, function(d) { return d.date; }));
yScale.domain([
d3.min(cities, function(c) {
return d3.min(c.values, function(v) { return v.temperature; }); }),
d3.max(cities, function(c) {
return d3.max(c.values, function(v) { return v.temperature; }); })
]);
var t0 = svg.transition().duration(750);
t0.selectAll(".line")
.attr("d", function(cities) { return line(cities.values); })
.style("stroke", function(cities) { return color(cities.name); });
t0.selectAll(".label").attr("transform",
"translate(0,0)").text(function(cities) { return cities.name; });
var t1 = t0.transition();
// t1.selectAll(".line").attr("d", line(data));
// t1.select(".line")
t1.selectAll(".line")
// t1.selectAll(".city")
.attr("d", function(cities) { return line(cities.values); })
.style("stroke", function(cities) { return color(cities.name); });
t1.select(".y.axis").call(yAxis);
t1.select(".x.axis").call(xAxis);
t1.select(".label")
.attr("transform", function(d) { return "translate(" +
xScale(d.values.date) + "," +
yScale(d.values.temperature) + ")"; });
} // function change()
</script>
</html>