Wait for element to appear, setTimeout

waitForElementToAppear.js

    function waitForElementToAppear(selector, time) {
        if(document.querySelector(selector)!=null) {
            alert("The element is displayed, you can put your code instead of this alert.");
            return;
        }
        else {
            setTimeout(function() {
                waitForElementToAppear(selector, time);
            }, time);
        }
    }