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I am learning d3. I want to make a line chart using json data. The data I am using is:
var data = [
{ "at": "2014-11-18T07:29:03.859Z", "value": 0.553292},
{ "at": "2014-11-18T07:28:53.859Z", "value": 0.563292},
{ "at": "2014-11-18T07:28:43.859Z", "value": 0.573292},
{ "at": "2014-11-18T07:28:33.859Z", "value": 0.583292},
{ "at": "2014-11-18T07:28:13.859Z", "value": 0.553292},
{ "at": "2014-11-18T07:28:03.859Z", "value": 0.563292}];
I want "at" on x axis and "value" on y axis. Also I need to parse the "at" as time only. Please provide me pointers how i will proceed further. The code till now I have implemented is below. I tried to look for documentation for this but found none.
<html>
<head>
<title>line chart on json</title>
<script src="http://d3js.org/d3.v2.js"></script>
<style>
/* tell the SVG path to be a thin blue line without any area fill */
path {
stroke: steelblue;
stroke-width: 1;
fill: none;
}
</style>
</head>
<body>
<script>
var width = 400;
var height = 150;
var data = [
{ "at": "2014-11-18T07:29:03.859Z", "value": 0.553292},
{ "at": "2014-11-18T07:28:53.859Z", "value": 0.563292},
{ "at": "2014-11-18T07:28:43.859Z", "value": 0.573292},
{ "at": "2014-11-18T07:28:33.859Z", "value": 0.583292},
{ "at": "2014-11-18T07:28:13.859Z", "value": 0.553292},
{ "at": "2014-11-18T07:28:03.859Z", "value": 0.563292}];
var x = d3.scale.ordinal();
var y = d3.scale.linear().range([height, 0]);
var xAxis = d3.svg.axis().scale(x).orient("bottom");
var line = d3.svg.line()
.x(function(d) { return x(d.at);})
.y(function(d) { return y(d.value); })
.interpolate("linear")
var graph = d3.select(graph1).append("svg:svg").attr("width", "300"). attr("height", "150");
function make_y_axis() {
return d3.svg.axis().scale(y).orient("left").ticks(5)
}
</script>
</body>
</html>
875
Look at this example http://bl.ocks.org/crayzeewulf/9719255
There used 2 graphs, but you can use just one and place data as you want.
As for date you can look at this example http://jsfiddle.net/robdodson/KWRxW/, xAxis in particular.
var xAxis = d3.svg.axis()
.scale(x)
.orient('bottom')
.ticks(d3.time.days, 1)
.tickFormat(d3.time.format('%a %d'))
.tickSize(0)
.tickPadding(8);
What is graph1 in the below line:
var graph = d3.select(graph1).append("svg:svg").attr("width", "300"). attr("height", "150");
41
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