对于 d3.js (d3.v4.js)，基于 https://bl.ocks.org/mbostock/3884955 (多系列折线图)，如果必须处理新数据，我需要更新标签文本。
这个例子几乎可以工作了。出了点问题，因为旧标签文本 (Old York) 与新标签文本 (New York) 仍然在图表中可见。
这是我的代码:
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
.axis--x path {
display: none;
}
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
</style>
<button>Click me</button>
<svg width="960" height="500"></svg>
<!--<script src="d3.v4.js"></script>-->
<script>
var svg = d3.select("svg"),
margin = {
top: 20,
right: 80,
bottom: 30,
left: 50
},
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var parseTime = d3.timeParse("%Y%m%d");
var x = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
z = d3.scaleOrdinal(d3.schemeCategory10);
var line = d3.line()
.curve(d3.curveBasis)
.x(function (d) {
return x(d.date);
})
.y(function (d) {
return y(d.temperature);
});
var data = [{
"date": "1136156400000",
"Old York": 63.4,
"San Francisco": 62.7,
"Austin": 72.2
}, {
"date": "1167692400000",
"Old York": 58.0,
"San Francisco": 59.9,
"Austin": 67.7
}, {
"date": "1199228400000",
"Old York": 53.3,
"San Francisco": 59.1,
"Austin": 69.4
}, {
"date": "1230850800000",
"Old York": 55.7,
"San Francisco": 58.8,
"Austin": 68.0
}, {
"date": "1262386800000",
"Old York": 62.3,
"San Francisco": 55.1,
"Austin": 71.9
}];
var data2 = [{
"date": "1136156400000",
"New York": 263.4,
"San Francisco": 262.7,
"Austin": 372.2
}, {
"date": "1167692400000",
"New York": 458.0,
"San Francisco": 259.9,
"Austin": -367.7
}, {
"date": "1199228400000",
"New York": 153.3,
"San Francisco": 259.1,
"Austin": 369.4
}, {
"date": "1230850800000",
"New York": 155.7,
"San Francisco": 258.8,
"Austin": 368.0
}, {
"date": "1262386800000",
"New York": 162.3,
"San Francisco": 255.1,
"Austin": 371.9
}];
// d3.tsv("data.tsv", type, function (error, data) {
// if (error) throw error;
data.columns = ["date", "Old York", "San Francisco", "Austin"];
var cities = data.columns.slice(1).map(function (id) {
return {
id: id,
values: data.map(function (d) {
return {
date: d.date,
temperature: d[id]
};
})
};
});
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([
d3.min(cities, function (c) {
return d3.min(c.values, function (d) {
return d.temperature;
});
}),
d3.max(cities, function (c) {
return d3.max(c.values, function (d) {
return d.temperature;
});
})
]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("fill", "#000")
.text("Temperature, ºF");
update();
d3.select("button").on("click", function () {
// cities.splice(0, 1);
data = data2;
data.columns = ["date", "New York", "San Francisco", "Austin"];
// console.log(JSON.stringify(cities));
update();
});
function update() {
// data.columns = ["date", "New York", "San Francisco", "Austin"];
cities = data.columns.slice(1).map(function (id) {
return {
id: id,
values: data.map(function (d) {
return {
date: d.date,
temperature: d[id]
};
})
};
});
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([
d3.min(cities, function (c) {
return d3.min(c.values, function (d) {
return d.temperature;
});
}),
d3.max(cities, function (c) {
return d3.max(c.values, function (d) {
return d.temperature;
});
})
]);
z.domain(cities.map(function (c) {
return c.id;
}));
var city = g.selectAll(".city")
.data(cities);
city.append("text")
.datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
})
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.text(function (d) {
return d.id;
});
// var text = g.selectAll(".text")
// .data(texts);
city.exit().remove();
var cityEnter = city.enter().append("g")
.attr("class", "city");
cityEnter.append("path")
.attr("class", "line")
.attr("d", function (d) {
return line(d.values);
})
.style("stroke", function (d) {
return z(d.id);
});
city = cityEnter.merge(city);
cityEnter.append("text")
// city.append("text")
.datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
})
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.text(function (d) {
return d.id;
});
city.select("path")
// .transition().duration(1000)
.attr("d", function (d) {
return line(d.values);
});
city.select("text").datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
// .transition().duration(1000)
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
});
svg.select(".axis--y")
// .transition().duration(1000)
.call(d3.axisLeft(y));
}
</script>最佳答案
您正在附加一个新的 <text>在更新中选择。由于您要更新组合选择中的文本，因此您甚至不需要更新文本值。您可以删除这部分:
city.append("text")
.datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
})
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.text(function (d) {
return d.id;
});
您还需要更新文本:
city.select("text").datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.text(function (d) {
return d.id;
})
这是更新后的代码:
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
.axis--x path {
display: none;
}
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
</style>
<button>Click me</button>
<svg width="960" height="500"></svg>
<!--<script src="d3.v4.js"></script>-->
<script>
var svg = d3.select("svg"),
margin = {
top: 20,
right: 80,
bottom: 30,
left: 50
},
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var parseTime = d3.timeParse("%Y%m%d");
var x = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
z = d3.scaleOrdinal(d3.schemeCategory10);
var line = d3.line()
.curve(d3.curveBasis)
.x(function (d) {
return x(d.date);
})
.y(function (d) {
return y(d.temperature);
});
var data = [{
"date": "1136156400000",
"Old York": 63.4,
"San Francisco": 62.7,
"Austin": 72.2
}, {
"date": "1167692400000",
"Old York": 58.0,
"San Francisco": 59.9,
"Austin": 67.7
}, {
"date": "1199228400000",
"Old York": 53.3,
"San Francisco": 59.1,
"Austin": 69.4
}, {
"date": "1230850800000",
"Old York": 55.7,
"San Francisco": 58.8,
"Austin": 68.0
}, {
"date": "1262386800000",
"Old York": 62.3,
"San Francisco": 55.1,
"Austin": 71.9
}];
var data2 = [{
"date": "1136156400000",
"New York": 263.4,
"San Francisco": 262.7,
"Austin": 372.2
}, {
"date": "1167692400000",
"New York": 458.0,
"San Francisco": 259.9,
"Austin": -367.7
}, {
"date": "1199228400000",
"New York": 153.3,
"San Francisco": 259.1,
"Austin": 369.4
}, {
"date": "1230850800000",
"New York": 155.7,
"San Francisco": 258.8,
"Austin": 368.0
}, {
"date": "1262386800000",
"New York": 162.3,
"San Francisco": 255.1,
"Austin": 371.9
}];
// d3.tsv("data.tsv", type, function (error, data) {
// if (error) throw error;
data.columns = ["date", "Old York", "San Francisco", "Austin"];
var cities = data.columns.slice(1).map(function (id) {
return {
id: id,
values: data.map(function (d) {
return {
date: d.date,
temperature: d[id]
};
})
};
});
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([
d3.min(cities, function (c) {
return d3.min(c.values, function (d) {
return d.temperature;
});
}),
d3.max(cities, function (c) {
return d3.max(c.values, function (d) {
return d.temperature;
});
})
]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("fill", "#000")
.text("Temperature, ºF");
update();
d3.select("button").on("click", function () {
// cities.splice(0, 1);
data = data2;
data.columns = ["date", "New York", "San Francisco", "Austin"];
// console.log(JSON.stringify(cities));
update();
});
function update() {
// data.columns = ["date", "New York", "San Francisco", "Austin"];
cities = data.columns.slice(1).map(function (id) {
return {
id: id,
values: data.map(function (d) {
return {
date: d.date,
temperature: d[id]
};
})
};
});
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([
d3.min(cities, function (c) {
return d3.min(c.values, function (d) {
return d.temperature;
});
}),
d3.max(cities, function (c) {
return d3.max(c.values, function (d) {
return d.temperature;
});
})
]);
z.domain(cities.map(function (c) {
return c.id;
}));
var city = g.selectAll(".city")
.data(cities);
// var text = g.selectAll(".text")
// .data(texts);
city.exit().remove();
var cityEnter = city.enter().append("g")
.attr("class", "city");
cityEnter.append("path")
.attr("class", "line")
.attr("d", function (d) {
return line(d.values);
})
.style("stroke", function (d) {
return z(d.id);
});
city = cityEnter.merge(city);
cityEnter.append("text")
// city.append("text")
.datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
})
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.text(function (d) {
return d.id;
});
city.select("path")
// .transition().duration(1000)
.attr("d", function (d) {
return line(d.values);
});
city.select("text").datum(function (d) {
return {
id: d.id,
value: d.values[d.values.length - 1]
};
})
.text(function (d) {
return d.id;
})
// .transition().duration(1000)
.attr("transform", function (d) {
return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
});
svg.select(".axis--y")
// .transition().duration(1000)
.call(d3.axisLeft(y));
}
</script>关于javascript - d3 : update of chart via exit/remove/merge does not process changed label text properly，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42797393/