acceptrate.user.js

// ==UserScript==
// @name Accept Rate
// @version 0.5
// @description Display a user's Stack Exchange question accept rate
// @namespace k0tFZXXD
// @author Michael Hampton, Michael Newton
// @license GNU GPL v3 or later (http://www.gnu.org/copyleft/gpl.html)
// @include https://stackoverflow.com/*
// @include https://serverfault.com/*
// @include https://superuser.com/*
// @include https://meta.stackoverflow.com/*
// @include https://meta.serverfault.com/*
// @include https://meta.superuser.com/*
// @include https://stackapps.com/*
// @include https://.stackexchange.com/
// @include https://askubuntu.com/*
// @include https://meta.askubuntu.com/*
// @include https://answers.onstartups.com/*
// @include https://meta.answers.onstartups.com/*
// @include https://mathoverflow.net/*
// @include https://meta.mathoverflow.net/*
// @include https://discuss.area51.stackexchange.com/*
// @exclude https://chat./

// ==/UserScript==
function with_jquery(f) {
	var script = document.createElement("script");
	script.textContent = "(" + f.toString() + ")(jQuery)";
	document.body.appendChild(script);
};

with_jquery(function($) {
	// Ensure we are looking at a question
	if (!$("body").hasClass("question-page")) return;

	// Find the user ID who wrote the question
	var userid = $(".post-signature.owner > div > div.user-details > a").attr("href").match(/\/users\/(\d+)(?:\/|$)/)[1];
	// Many SE users have negative IDs; none of them are interesting to us
	if (userid < 1) return;

	// Get user's info from the SE API
	var apiurl = location.protocol + "//api.stackexchange.com/2.1/users/" + userid + "?site=" + location.host;
	$.get(apiurl, function(o) {
		var user = o.items[0], userclass;
		if (!user) return;
		if ('accept_rate' in user) {
			// TODO: These percentages might not be exactly as
			// they used to be. Try to verify them later.
			if (user['accept_rate'] > 80) {
				userclass = "accept-answer-link";
			} else if (user['accept_rate'] > 35) {
				userclass = "cool";
			} else if (user['accept_rate'] > 20) {
				userclass = "warm";
			} else if (user['accept_rate'] > 5) {
				userclass = "hot";
			} else {
				userclass = "supernova";
			}
			$(".post-signature.owner > div").append($("<br>").addClass("cbt"));
			$(".post-signature.owner > div").append($("<div>").addClass("accept-rate " + userclass).text(user.accept_rate + "% accept rate"));
		}
		return;
	});
	return;
});