我正在使用d3.time.scale()
(参考here)创建时间刻度并使用axis.tickValues([values])
(here)提供刻度值。为[values]中提供的指定Date对象呈现刻度。
一切正常,但是刻度值表示总是在浏览器的当前时区。现在要求在特定时区(例如,“亚洲/加尔各答”)展示它。有没有办法实现这个目标?我看到的最大选项是格式化刻度,但不是用自定义值替换它们,这对案例没有帮助。
编辑:这可以使用 moment.js 之类的外部库来实现,但如果可以避免这种情况,则会更好。
答案 0 :(得分:3)
时区在屁股上是如此痛苦。但是,如果您将d3
与优秀的JArray.FromObject()
结合使用,使用tickformatter
功能可以轻松完成此任务:
// create reference to current zone
var currentTZ = "local";
// Define the axes
var xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(10)
.tickFormat(function(d){
console.log('format');
if (currentTZ === "local")
return moment(d).format('hh:mm:ss');
else
return moment(d).tz(currentTZ).format('hh:mm:ss');
});
// when user picks a new zone, re-draw axis
...
.append("select")
.on('change', function(d){
currentTZ = this.options[ this.selectedIndex ].text;
svg.selectAll("g.x.axis")
.call(xAxis);
})
这是一个完整的工作示例:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script data-require="moment.js@2.10.2" data-semver="2.10.2" src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.2/moment.min.js"></script>
<script data-require="moment-timezone-with-data@0.4.0" data-semver="0.4.0" src="http://momentjs.com/downloads/moment-timezone-with-data.js"></script>
<style>
/* set the CSS */
body {
font: 12px Arial;
}
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path,
.axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}
</style>
</head>
<body>
<!-- load the d3.js library -->
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
// Set the dimensions of the canvas / graph
var margin = {
top: 30,
right: 20,
bottom: 100,
left: 50
},
width = 600 - margin.left - margin.right,
height = 270 - margin.top - margin.bottom;
var currentTZ = "local";
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
// Define the axes
var xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(10)
.tickFormat(function(d){
console.log('format');
if (currentTZ === "local")
return moment(d).format('hh:mm:ss');
else
return moment(d).tz(currentTZ).format('hh:mm:ss');
});
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
// Define the line
var valueline = d3.svg.line()
.x(function(d) {
return x(d.date);
})
.y(function(d) {
return y(d.close);
});
// Adds the svg canvas
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 data = [{
date: moment().add(0, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(1, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(2, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(3, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(4, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(5, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(6, 'hours').toDate(),
close: Math.random() * 100
}, {
date: moment().add(7, 'hours').toDate(),
close: Math.random() * 100
}]
// Scale the range of the data
x.domain(d3.extent(data, function(d) {
return d.date;
}));
y.domain([0, d3.max(data, function(d) {
return d.close;
})]);
// Add the valueline path.
svg.append("path")
.attr("class", "line")
.attr("d", valueline(data));
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function(d) {
return "rotate(-65)"
});
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
d3.select("body")
.append("select")
.on('change', function(d){
currentTZ = this.options[ this.selectedIndex ].text;
svg.selectAll("g.x.axis")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function(d) {
return "rotate(-65)"
});
})
.selectAll("option")
.data(['local'].concat(moment.tz.names()))
.enter()
.append("option")
.text(function(d){
return d;
});
</script>
</body>
</html>
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答案 1 :(得分:3)
根据Mark的解决方案,这是一个工作解决方案 ,不使用外部库 。在文本字段中输入时区ID(例如 - 欧洲/柏林)。
// Set the dimensions of the canvas / graph
var margin = {
top: 30,
right: 20,
bottom: 100,
left: 50
},
width = 600 - margin.left - margin.right,
height = 270 - margin.top - margin.bottom;
var currentTZ = "local";
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
// Define the axes
var xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(10)
.tickFormat(function (d) {
if (currentTZ === "local") return d3.time.format('%X')(d);
else {
console.log(currentTZ);
return d3.time.format('%X')(new Date(d.toLocaleString('en-US', {
timeZone: currentTZ
})));
}
});
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
// Define the line
var valueline = d3.svg.line()
.x(function (d) {
return x(d.date);
})
.y(function (d) {
return y(d.close);
});
// Adds the svg canvas
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 data = [{
date: new Date(0),
close: Math.random() * 100
}, {
date: new Date(1800000),
close: Math.random() * 100
}, {
date: new Date(3600000),
close: Math.random() * 100
}, {
date: new Date(5400000),
close: Math.random() * 100
}, {
date: new Date(7200000),
close: Math.random() * 100
}, {
date: new Date(9000000),
close: Math.random() * 100
}, {
date: new Date(10800000),
close: Math.random() * 100
}, {
date: new Date(12600000),
close: Math.random() * 100
}]
// Scale the range of the data
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([0, d3.max(data, function (d) {
return d.close;
})]);
// Add the valueline path.
svg.append("path")
.attr("class", "line")
.attr("d", valueline(data));
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function (d) {
return "rotate(-65)"
});
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
handleClick = function () {
currentTZ = document.getElementById('timeZ').value;
console.log(currentTZ)
svg.selectAll("g.x.axis")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function () {
return "rotate(-65)"
});
};
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body {
font: 12px Arial;
}
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path, .axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}
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<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<input name="Submit" type="submit" value="Change Time" onClick="handleClick()">
<input type="text" id="timeZ" value="local">
</form>
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