Answers for "howto run javasript wait until a div loaded"

wait for the dom to load javascript

document.addEventListener('DOMContentLoaded', (event) => {
  //the event occurred
})

wait for element to load

loading = setInterval(function () {
    if (document.getElementById("myElement")) {
        // Element Has Loaded, Put your code here!
        clearInterval(loading);
    }
}, 100); // Checks every 100ms(0.1s)