Reputation: 2251
I'm trying to make a pie chart using d3. To do this I am send my data in a JSON format to my view and then I'd like to try and total up three of the parameters and then use these in the pie chart. So far I have managed to get the data to the view but now I need to use a foreach to total up the parameters. I'm only working on one at the moment.
Script:
var width = 960,
height = 500,
radius = Math.min(width, height) / 2;
var color = d3.scale.ordinal()
.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c"]);
var arc = d3.svg.arc()
.outerRadius(radius - 10)
.innerRadius(0);
var pie = d3.layout.pie()
.sort(null)
.value(function (d) { return d.Query; });
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var data = @Html.Raw(@Model.output);
var QueryTotal = data.forEach(function(d) {
d.Query = +d.Query;
});
console.log(QueryTotal);
var g = svg.selectAll(".arc")
.data(pie(data))
.enter().append("g")
.attr("class", "arc");
g.append("path")
.attr("d", arc)
.style("fill", function (d) { return color("Query"); });
g.append("text")
.attr("transform", function (d) { return "translate(" + arc.centroid(d) + ")"; })
.attr("dy", ".35em")
.style("text-anchor", "middle")
.text(function (d) { return "Query"; });
How do I use a for each to total up the values, I've given it an attempt which you can see above. It just returns undefined.
Upvotes: 0
Views: 1944
Reputation: 109242
The D3 way to do this is to use d3.sum()
:
var QueryTotal = d3.sum(data, function(d) { return d.Query; });
Upvotes: 1
Reputation: 3122
To sum the values, use reduce()
var QueryTotal = data.reduce(function(prev, d) {
return prev + d.Query;
}, 0);
Or, using your existing structure:
var QueryTotal = 0;
data.forEach(function(d) {
QueryTotal += d.Query;
});
Upvotes: 1