Filters meetup.com pages based on a given regex of linked member profiles. Useful for finding language exchange partners.

meetupfilter.js

/* Initial definitions */
var regex_positive = /(france|french|paris|bonjour|salut|montr.al)/i;
var regex_negative = /(china|korea|spain|japan|taiwan|venezuela|costa rica|chile|vietnam|russia|honduras|brazil|iran|m.xico|czech|sweden|saudi|turkey|germany|india|argentina|colombia|netherlands|philippines)/i;
var now = new Date().getTime();
var ten_seconds = 10 * 1000;
var one_day = 86400 * 1000;
var one_week = one_day * 7;

/* Clear junk from the page */
jQuery("#chapterHeader, p").remove();

/* Find the member links */
var urls = {};
jQuery("a[href*=member]").each(function() { 
    var element = jQuery(this);
    var match = element.attr("href").match(/(.*\/members?\/[0-9]+)/);
    if (match) {
        urls[match[1]] = true;
        element.css({display: "inline-block", background: "#0ff"}).find("img").css({opacity: 0.5});
    }
});

/* The function that highlights the content */
function addOverview(element, content) {
    var rating = 0;
    if (content.profileQuestionsText.match(regex_positive)) rating += 4;
    if (content.profileQuestionsText.match(regex_negative)) rating -= 4;
    if (content.profileAsideText.match(regex_positive)) rating += 1;
    if (content.profileAsideText.match(regex_negative)) rating -= 1;
    element.css({background: "hsl(" + (Math.max(0, rating) * 20) +", 80%, 50%)"});
    if (rating < 0) element.parents(".memberInfo").remove();
}

/* Attach our extra content to each block */
jQuery.each(urls, function(url) {
    var matchingElements = jQuery("a[href^='"+url+"']");
 
    /* Try to use the cached value */
    var timedContent = localStorage[url] ? JSON.parse(localStorage[url]) : null;
    if (timedContent && timedContent.expires > now) {
        jQuery.each(matchingElements, function(index, element) {
            addOverview(jQuery(element), timedContent);
        });
    }
 
    /* Otherwise, getting the linked page's content and parse it out */
    else {
        jQuery.get(url, function(data) {
            var remotePage = jQuery(data);
            var content = {};
            content.expires = now + one_week;
            content.profileQuestionsText = jQuery("#D_memberProfileQuestions", remotePage).text().replace(/\s+/g, ' ');
            content.profileAsideText = jQuery("#D_memberProfileAside", remotePage).text().replace(/\s+/g, ' ');
            localStorage[url] = JSON.stringify(content);
            jQuery.each(matchingElements, function(index, element) {
                addOverview(jQuery(element), content);
            });
        });
    }
});