Javascript 如何参考数据
漂亮干净。。。但这并不明显,也不是说教。如何引用这些数据Javascript 如何参考数据,javascript,initialization,Javascript,Initialization,漂亮干净。。。但这并不明显,也不是说教。如何引用这些数据 var myData = function() { return stream_layers(3,10+Math.random()*100,.1).map(function(data, i) { return { key: 'Stream' + i, values: data }; }); } 在此代码片段演示中: nv.addGraph(function() { var char
var myData = function() {
return stream_layers(3,10+Math.random()*100,.1).map(function(data, i) {
return {
key: 'Stream' + i,
values: data
};
});
}
在此代码片段演示中:
nv.addGraph(function() {
var chart = nv.models.multiBarChart();
chart.xAxis
.tickFormat(d3.format(',f'));
chart.yAxis
.tickFormat(d3.format(',.1f'));
d3.select('#chart svg')
.datum(data()) // how to put MyData here?
.transition().duration(500)
.call(chart)
;
nv.utils.windowResize(chart.update);
return chart;
});
如何将myData置于.datumdata
笔记
这是一个完整的HTML5,用作演示和bug:
<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<title>NVD3 DEMO1</title>
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.rawgit.com/novus/nvd3/v1.8.1/build/nv.d3.css" rel="stylesheet">
<script src="https://d3js.org/d3.v5.min.js"></script>
<script src="https://cdn.rawgit.com/novus/nvd3/v1.8.1/build/nv.d3.min.js"></script>
<style>
#chart svg { height: 400px; }
</style>
<script>
/////////// fake data generation:
/* Inspired by Lee Byron's test data generator. */
function stream_layers(n, m, o) {
if (arguments.length < 3) o = 0;
function bump(a) {
var x = 1 / (.1 + Math.random()),
y = 2 * Math.random() - .5,
z = 10 / (.1 + Math.random());
for (var i = 0; i < m; i++) {
var w = (i / m - y) * z;
a[i] += x * Math.exp(-w * w);
}
}
return d3.range(n).map(function() {
var a = [], i;
for (i = 0; i < m; i++) a[i] = o + o * Math.random();
for (i = 0; i < 5; i++) bump(a);
return a.map(stream_index);
});
}
/* Another layer generator using gamma distributions. */
function stream_waves(n, m) {
return d3.range(n).map(function(i) {
return d3.range(m).map(function(j) {
var x = 20 * j / m - i / 3;
return 2 * x * Math.exp(-.5 * x);
}).map(stream_index);
});
}
function stream_index(d, i) {
return {x: i, y: Math.max(0, d)};
}
////////////////////////////////////////
var myData = function() {
return stream_layers(3,10+Math.random()*100,.1).map(function(data, i) {
return {
key: 'Stream' + i,
values: data
};
});
};
function ONLOAD() {
nv.addGraph(function() {
var chart = nv.models.multiBarChart();
chart.xAxis
.tickFormat(d3.format(',f'));
chart.yAxis
.tickFormat(d3.format(',.1f'));
d3.select('#chart svg')
.datum( myData() ) // old datum(data())
.transition().duration(500)
.call(chart)
;
nv.utils.windowResize(chart.update);
return chart;
});
} // ONLOAD
</script>
</head>
<body onload="ONLOAD()">
<h2>NVD3 DEMO1</h2>
<div id="chart">
<svg></svg>
</div>
</body>
</html>
我仔细研究了这件事,发现问题出在D3版本,它需要v3而不是v5 我将您的示例更改为:
<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<title>NVD3 DEMO1</title>
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.rawgit.com/novus/nvd3/v1.8.1/build/nv.d3.css" rel="stylesheet">
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://cdn.rawgit.com/novus/nvd3/v1.8.1/build/nv.d3.min.js"></script>
<style>
#chart svg { height: 400px; }
</style>
<script>
/////////// fake data generation:
/* Inspired by Lee Byron's test data generator. */
function stream_layers(n, m, o) {
if (arguments.length < 3) o = 0;
function bump(a) {
var x = 1 / (.1 + Math.random()),
y = 2 * Math.random() - .5,
z = 10 / (.1 + Math.random());
for (var i = 0; i < m; i++) {
var w = (i / m - y) * z;
a[i] += x * Math.exp(-w * w);
}
}
return d3.range(n).map(function() {
var a = [], i;
for (i = 0; i < m; i++) a[i] = o + o * Math.random();
for (i = 0; i < 5; i++) bump(a);
return a.map(stream_index);
});
}
/* Another layer generator using gamma distributions. */
function stream_waves(n, m) {
return d3.range(n).map(function(i) {
return d3.range(m).map(function(j) {
var x = 20 * j / m - i / 3;
return 2 * x * Math.exp(-.5 * x);
}).map(stream_index);
});
}
function stream_index(d, i) {
return {x: i, y: Math.max(0, d)};
}
////////////////////////////////////////
var myData = function() {
return stream_layers(3,10+Math.random()*100,.1).map(function(data, i) {
return {
key: 'Stream' + i,
values: data
};
});
};
function ONLOAD() {
nv.addGraph(function() {
var chart = nv.models.multiBarChart();
chart.xAxis
.tickFormat(d3.format(',f'));
chart.yAxis
.tickFormat(d3.format(',.1f'));
d3.select('#chart svg')
.datum( myData() ) // old datum(data())
.transition().duration(500)
.call(chart)
;
nv.utils.windowResize(chart.update);
return chart;
});
} // ONLOAD
</script>
</head>
<body onload="ONLOAD()">
<h2>NVD3 DEMO1</h2>
<div id="chart">
<svg></svg>
</div>
</body>
</html>
而且效果很好。.datummyData?。。。我丢失了什么吗?@briosheje.datum myData的错误是未捕获的类型错误:a.dispatch.render\u start不是函数。同样的。datum myData。嗨,阿图尔,谢谢你的建议,你能用一行我必须更改的行来准确地表达解决方案吗?你可以测试。尝试复制/粘贴我在问题中发布的完整HTML代码,并测试您的解决方案。@PeterKrauss检查新答案。