I am a newbie in d3. I am trying to visualize some data using cubism every 10 mins. My json string has 2 keys which are name(string) and activity(double).
I am having trouble with defining the metric. I looked at the stocks demo but somehow while debugging i find that the control never goes into the d3.json line. I am kinda stuck here. Similarly the initial d3.json code where i want to separate out the names to pass on to .data while selecting the .horizon.
If i use the normal random numbers like in example then it works.
Here is the metric definition in the random function-
var foo;
d3.json("rest.php/data", function(data) {
var recs = data.records;
for(var i=0; i<recs.length; i++) {
names[i] = recs[i].name;
foo = random(names[i]);
}
});
d3.select("body").selectAll(".horizon")
.data([foo])
.enter().insert("div")
.attr("class", "horizon")
.call(context.horizon().extent([-20, 20]));
context.on("focus", function(i) {
d3.selectAll(".value").style("right", i == null ? null : context.size() - i + "px");
});
function random(name) {
return context.metric(function(start, stop, step, callback) {
var values = [];
d3.json("rest.php/data", function(rows) {
var recs = rows.records;
start = +start;
start = +stop;
while(start < stop){
start += step;
values.push(recs.activity);
}
callback(null, values);
});
}, name);
}
When i use the a defined string of data like var foo = random("foo"); it works but when i try to send data like above it fails and throws an error -
TypeError: metric_ is undefined
var extent = metric_.extent();
Can anyone please help me out here ?
