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Trello CSS Guide

“I perfectly understand our CSS. I never have any issues with cascading rules. I never have to use !important or inline styles. Even though somebody else wrote this bit of CSS, I know exactly how it works and how to extend it. Fixes are easy! I have a hard time breaking our CSS. I know exactly where to put new CSS. We use all of our CSS and it’s pretty small overall. When I delete a template, I know the exact corresponding CSS file and I can delete it all at once. Nothing gets left behind.”

You often hear updog saying stuff like this. Who’s updog? Not much, who is up with you?

This is where any fun you might have been having ends. Now it’s time to get serious and talk about rules.

Writing CSS is hard. Even if you know all the intricacies of position and float and overflow and z-index, it’s easy to end up with spaghetti code where you need inline styles, !important rules, unused cruft, and general confusion. This guide provides some architecture for writing CSS so it stays clean and ma

jovey-zheng / filereader.js
Last active Dec 30, 2015
FileReader() sample
View filereader.js
handleFileChoose() {
const fileReader = new FileReader();
const imgUrl = document.getElementById('openFile').files[0];
if (imgUrl) {
fileReader.onloadend = () => {
document.getElementById('avatarImg').src = fileReader.result;
jovey-zheng / bgCover.css
Last active Mar 8, 2016
CSS: background fixed and cover.
View bgCover.css
.bg-cover {
background: url('xxx.jpg') no-repeat;
background-attachment: fixed;
background-size: cover;
jovey-zheng / autoLoading.js
Last active Apr 13, 2016
when user scroll some position then auto loading data ...
View autoLoading.js
handleAppend() {
const top = window.pageYOffset ||
document.documentElement.scrollTop ||
if (!isEmpty(data)
&& (top + window.innerHeight) / document.body.scrollHeight > 0.9
&& !isloading // false
) {
//do something ...
jovey-zheng / merge.js
Created May 20, 2016
merge array based on lodash.
View merge.js
var _ = require('lodash');
module.exports = function (source, target) {
var joinArrays = function (a, b) {
if (_.isArray(a) && _.isArray(b)) {
return a.concat(b);
if (_.isPlainObject(a) && _.isPlainObject(b)) {
return _.merge(a, b, joinArrays);
jovey-zheng / _.chunk.js
Created Jul 28, 2016
Transform an array to some chunk array.
View _.chunk.js
function chunk(arr, chunk) {
var res = [],
len = arr.length,
_len = Math.ceil(arr.length / chunk),
_chunk = 0;
chunk = chunk > len ? len : chunk;
for (var i = 0; i < _len ;i++) {
var _arr = [];
View DateFormat.js
class DateFormat {
constructor(tmp) {
this.tmp = +tmp ||;
duration(format = 'HH:mm:ss') {
let hour = ~~(this.tmp/1000/60/60);
let minutes = ~~((this.tmp/1000/60)%60);
let seconds = ~~((this.tmp/1000)%60);
jovey-zheng / numtoCl.js
Created Aug 3, 2016
Transform Number to Chinese.
View numtoCl.js
var numtoCL = {}
var Maxnumb = 9007199254740992;
numtoCL.toS = function(num,m){
var op = {
ch: '零一二三四五六七八九'
,ch_u: '个十百千万亿'
,other: '负点'
,toCL: this.toCL
View isRepeat.js
function isRepeat(arr){
var hash = {};
for (var item of arr) {
if (hash[item]) {
return true;
hash[item] = false;
View cache.js
// 简单的缓存工具
// 匿名函数创造了一个闭包
const cache = (function() {
const store = {};
return {
get(key) {
return store[key];
set(key, val) {
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