Waiting-for-element-load-javascript-promise.js

    /*kiki67100 github 09/01/2023*/
    
    /*Waiting in javascript a html element perfect for scrapping and more easy to use than MutationObserver */
    let check_available_el = function (querySelector, debug = false, fn_on_not_found = null, max_tries = 1000, test_interval = 500) {
        return new Promise(function (resolve, reject) {
            let iterator_count = 0;
            let __interval = setInterval(function () {
                iterator_count++;
                if (iterator_count > max_tries) {
                    clearInterval(__interval);
                    reject("maximum tries reached");
                }
                var check_el = document.querySelector(querySelector);
                if (check_el) {
                    if (debug) console.info('[check_available_el] ' + querySelector + ' is found');
                    clearInterval(__interval);
                    resolve();
                } else {
                    if (debug) console.info('[check_available_el] ' + querySelector + ' NOT found');
                    if (fn_on_not_found !== null) {
                        if (debug) console.log('[check_available_el]  fn_on_not_found() ')
                        if (typeof fn_on_not_found === "function") {
                            fn_on_not_found();
                        } else {
                            if (debug) console.warn('fn_on_not_found must be a function');
                        }

                    }
                }
            }, test_interval)

        })
    }