d3.js: tickformat - adding a % sign without multip

Question

my data has percents as, for example, [10.1, 3.2, 5.4]

d3.format("0f") will give me [10, 3, 5]

d3.format("0%") will give me [1010%, 320%, 540%] (multiplies by 100)

how do I get [10%, 3%, 5%]?

I can't figure out where to add a +"%" to the first case or eliminate the *100 in the second case

the relevant parts of the code:

var formatPercent = d3.format("0f");

var min = 0; 
var max = d3.max(data, function(d) { return + d[5]; });
max = Math.round(max * 1.2); // pad it

//define the x-axis
var xAxis = d3.svg.axis()
                .scale(x)
                .orient('top')
                .ticks(6)
                .tickFormat(formatPercent);

and data comes in like this:

{
    "Geography": [
    ["Midwest", 234017797, 498, 8.2, 9.0, 11.3],
    ["Northeast", 265972035, 566, 8.9, 12.1, 13.1],
    ["South", 246235593, 524, 8.1, 8.3, 10.8],
    ["West", 362774577, 772, 9.4,9.9, 11.7]
    ]
}

It's the last three numbers in each line that are the percentage values I'm using to chart ranges. I want the x-axis to be formatted in integer+% format based on the high and low values in the data.

Thank you!

Answer 1

Update for D3 v4 (using ES6):

// Can also be axisTop, axisRight, or axisBottom
d3.axisLeft()
    .tickFormat(d => d + "%")

Original answer for D3 v3:

You can create your own format:

d3.svg.axis()
    .tickFormat(function(d) { return d + "%"; });

If you want to get rid of the decimal places:

d3.svg.axis()
    .tickFormat(function(d) { return parseInt(d, 10) + "%"; });