javascript 如何在 xAxis 上格式化时间使用 d3.js
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how to format time on xAxis use d3.js
提问by L.T
According the demo on http://bl.ocks.org/mbostock/3883245
根据http://bl.ocks.org/mbostock/3883245上的演示
I don't know how format time on xAxis
我不知道如何在 xAxis 上格式化时间
this is my code : js:
这是我的代码：js：
var data = [{
"creat_time": "2013-03-12 15:09:04",
"record_status": "ok",
"roundTripTime": "16"
}, {
"creat_time": "2013-03-12 14:59:06",
"record_status": "ok",
"roundTripTime": "0"
}, {
"creat_time": "2013-03-12 14:49:04",
"record_status": "ok",
"roundTripTime": "297"
}, {
"creat_time": "2013-03-12 14:39:06",
"record_status": "ok",
"roundTripTime": "31"
},{
"creat_time": "2013-03-12 14:29:03",
"record_status": "ok",
"roundTripTime": "0"
}];
var margin = {top: 20, right: 20, bottom: 30, left: 50};
var width = 960 - margin.left - margin.right;
var height = 500 - margin.top - margin.bottom;
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
var x = d3.time.scale()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var line = d3.svg.line()
.x(function(d) { return x(d.creat_time); })
.y(function(d) { return y(d.roundTripTime); });
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 + ")");
data.forEach(function(d) {
d.creat_time = parseDate(d.creat_time);
d.roundTripTime = +d.roundTripTime;
});
x.domain(d3.extent(data, function(d) { return d.creat_time; }));
y.domain(d3.extent(data, function(d) { return d.roundTripTime;}));
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("return time(ms)");
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
this is svg:
这是 svg：
In svg , time is 12-hour clock ,but in my data time is 24-hour clock . how to keep the same format on svg and data?
在 svg 中，时间是 12 小时制，但在我的数据中时间是 24 小时制。如何在 svg 和数据上保持相同的格式？
Any help is appreciated. (ps:I hope you don't mind my English,it's so bad.)
任何帮助表示赞赏。（ps：我希望你不要介意我的英语，它太糟糕了。）
回答by olly_uk
You can use the tickFormat function on the axis object as below
您可以在轴对象上使用 tickFormat 函数，如下所示
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickFormat(d3.time.format("%H"));
The %Hspecifies hour (24-hour clock) as a decimal number [00,23]. Check this link D3 time formattingfor more information
该%H指定hour (24-hour clock) as a decimal number [00,23]。检查此链接D3 时间格式以获取更多信息
You can check out a working example in this tributary 24hr time example
您可以在这个支流24 小时时间示例中查看一个工作示例
回答by pilotcam
The accepted answer is indeed correct, but in my case, I needed the flexibility for the formats to adjust to different scales (think zooming), but also to ensure the 24hr clock is used. The key is to define a multi-resolution time format. See the Documentationpage for details.
接受的答案确实是正确的，但就我而言，我需要灵活地调整格式以适应不同的比例（想想缩放），同时还要确保使用 24 小时时钟。关键是定义一个多分辨率的时间格式。有关详细信息，请参阅文档页面。
My code:
我的代码：
var axisTimeFormat = d3.time.format.multi([
[".%L", function(d) { return d.getMilliseconds(); }],
[":%S", function(d) { return d.getSeconds(); }],
["%H:%M", function(d) { return d.getMinutes(); }],
["%H:%M", function(d) { return d.getHours(); }],
["%a %d", function(d) { return d.getDay() && d.getDate() != 1; }],
["%b %d", function(d) { return d.getDate() != 1; }],
["%B", function(d) { return d.getMonth(); }],
["%Y", function() { return true; }]
]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickFormat(axisTimeFormat);
回答by Mikhail Shabrikov
I want to add this linkto an awesome demo page. It is a playground when you can choose what a format specifier do you need for your case. It is very useful when you do not remember/know what a format specifier you should pass to your d3.timeFormatfunction.
我想将此链接添加到一个很棒的演示页面。当您可以选择您的案例所需的格式说明符时，这是一个游乐场。当您不记得/不知道应该传递给d3.timeFormat函数的格式说明符时，它非常有用。
I also want to notice, that if you have d3 version 4, you should use d3.timeFormatfunction, instead of d3.time.format.
我还想注意，如果你有 d3 版本 4，你应该使用d3.timeFormatfunction，而不是d3.time.format.
回答by KimchiMan
In v4,
在 v4 中，
...
var scaleX = d3.scaleTime().range([0, width]);
var axisBottom = d3.axisBottom(scaleX)
.ticks(d3.timeMinute, 10); // Every 10 minutes
...
Note that use d3.timeMinute- not d3.timeMinutes
注意使用d3.timeMinute- 不d3.timeMinutes
