2013-03-10 111 views
0

財產「長」在運行下面的代碼:遺漏的類型錯誤:無法讀取的不確定

<!DOCTYPE html> 
<meta charset="utf-8"> 
<style> 

body { 
    font: 10px sans-serif; 
} 

.axis path, 
.axis line { 
    fill: none; 
    stroke: #000; 
    shape-rendering: crispEdges; 
} 

.x.axis path { 
    display: none; 
} 

.line { 
    fill: none; 
    stroke: steelblue; 
    stroke-width: 1.5px; 
} 

</style> 
<body> 
<script src="http://d3js.org/d3.v3.js"></script> 
<script> 

var margin = {top: 20, right: 20, bottom: 30, left: 50}, 
    width = 960 - margin.left - margin.right, 
    height = 500 - margin.top - margin.bottom; 

var parseDate = d3.time.format("%e-%m-%Y").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.date); }) 
    .y(function(d) { return y(d.value); }); 

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 + ")"); 

d3.csv("http://localhost/webserver/data/downloads.csv", function(error, data) { 
    data.forEach(function(d) { 
    d.date = parseDate(d.date); 
    d.value = +d.value; 
    }); 

    x.domain(d3.extent(data, function(d) { return d.date; })); 
    y.domain(d3.extent(data, function(d) { return d.value; })); 

    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("Price ($)"); 

    svg.append("path") 
     .datum(data) 
     .attr("class", "line") 
     .attr("d", line); 
}); 

</script> 

我收到以下錯誤:

Uncaught TypeError: Cannot read property 'length' of undefined d3.v3.js:7296 

該行有如下描述:

function d3_time_parse(date, template, string, j) { 
    var c, p, i = 0, n = template.length, m = string.length; 

我的源數據看起來像這樣:

日期;值 23-4-2012; 12 24-4-2012; 10 25-4-2012; 13 26-4-2012; 24 27-4-2012; 45

回答

2

您的csv應該以逗號,作爲分隔符,屬性區分大小寫。試試這個:

date,value 
23-4-2012,12 
24-4-2012,10 
25-4-2012,13 
26-4-2012,24 
27-4-2012,45 
+0

我改變了分隔符,但你對屬性的含義是否區分大小寫? – csnake 2013-03-10 19:13:27

+0

您在代碼中有'd.date'和'd.value',但在csv中有'Date'和'Value' – polybios 2013-03-10 19:29:42

+0

現在正在工作,謝謝 – csnake 2013-03-10 19:58:51

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