Javascript D3：從csv到數組
[英]Javascript D3: from csv to array
問題描述
我從此頁面https://bl.ocks.org/mbostock/34f08d5e11952a80609169b7917d4172下載了javascript代碼。 我想進行更改，實際上html頁從csv文件中獲取數據，而我想直接從同一html頁上的數組中獲取數據。 也就是說，我想在index.html中創建一個簡單的數字數組和一個月數組，然后從那里獲取數據。
這是獲取數據的片段：
d3.csv("sp500.csv", type, function(error, data) {
if (error) throw error;
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) { return d.price; })]);
x2.domain(x.domain());
y2.domain(y.domain());
focus.append("path")
.datum(data)
.attr("class", "area")
.attr("d", area);
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);
context.append("path")
.datum(data)
.attr("class", "area")
.attr("d", area2);
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);
});
雖然我想在HTML頁面上有一個數字數組和一個月數組，但不使用csv：
var price = [9, 6, 2];
var date = [Jan 2000, Feb 2000, Mar 2000]
我能怎么做？ 謝謝
2 個解決方案
解決方案1
2 已采納 2018-07-20 19:55:00
這是一個bl.ock ，它將數組作為輸入。
var data = [{date: 'Jan 2000', price: 9}, {date: 'Feb 2000', price:6},{date: 'Mar 2000', price: 2}];
data.forEach(function (d) {
d.date = parseDate(d.date);
d.price = +d.price;
});
相同的代碼段：
<!DOCTYPE html> <meta charset="utf-8"> <style> .area { fill: steelblue; clip-path: url(#clip); } .zoom { cursor: move; fill: none; pointer-events: all; } </style> <svg width="960" height="500"></svg> <script src="https://d3js.org/d3.v4.min.js"></script> <script> var svg = d3.select("svg"), 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("%b %Y"); 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 area = d3.area() .curve(d3.curveMonotoneX) .x(function(d) { return x(d.date); }) .y0(height) .y1(function(d) { return y(d.price); }); var area2 = d3.area() .curve(d3.curveMonotoneX) .x(function(d) { return x2(d.date); }) .y0(height2) .y1(function(d) { return y2(d.price); }); svg.append("defs").append("clipPath") .attr("id", "clip") .append("rect") .attr("width", width) .attr("height", height); 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 = [{date: 'Jan 2000', price: 9}, {date: 'Feb 2000', price:6},{date: 'Mar 2000', price: 2}]; data.forEach(function (d) { d.date = parseDate(d.date); d.price = +d.price; }); x.domain(d3.extent(data, function(d) { return d.date; })); y.domain([0, d3.max(data, function(d) { return d.price; })]); x2.domain(x.domain()); y2.domain(y.domain()); focus.append("path") .datum(data) .attr("class", "area") .attr("d", area); 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); context.append("path") .datum(data) .attr("class", "area") .attr("d", area2); 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); 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)); focus.select(".area").attr("d", area); 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()); focus.select(".area").attr("d", area); focus.select(".axis--x").call(xAxis); context.select(".brush").call(brush.move, x.range().map(t.invertX, t)); } </script>
希望這可以幫助。
解決方案2
1 2018-07-20 18:36:33
您可以跳過csv函數並使用自己的數據
代替
d3.csv("sp500.csv", type, function(error, data) {
if (error) throw error;
x.domain(d3.extent(data, function(d) { return d.date; }));
//...
})
你可以做：
var data = [{date:'Jan 2000', price: 9}, {}, {}, ...];
x.domain(d3.extent(data, function(d) { return d.date; }));
//...
如果要使其保持功能，還可以：
var process = function(data) {
x.domain(d3.extent(data, function(d) { return d.date; }));
//...
})
process({date:'Jan 2000', price: 9}, {}, {}, ...]); // <-- the data
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