Javascript Cheatsheet

javascript_cheatsheet.md

Unique ID

// Generates a unique (enough) ID from current time in milliseconds + random
function uid() {
    return Date.now().toString(36) + Math.random().toString(36).substr(2, 12);
}

Watch for Elements Added to DOM

const list = document.getElementById('theList');
const obs = new MutationObserver(function(mutations, observer) {
    for (const mutation of mutations) {
        for (const node of mutation.addedNodes) {
            decorateListItem(node);
        }
    }
});
obs.observe(list, {"childList": true});