/**
 * Waits for a condition specified by 'conditionF' to be 'true' and calls the 'callbackF' function afterwards.
 *
 * @param conditionF function called to check the condition
 * @param callbackF function called when the condition was met, or when the 'maxTime' expired
 * @param interval (optional) interval to check
 * @param maxTime (optional) maximum time to expire
 */
function waitForCondition(conditionF, callbackF, interval, maxTime) {
    if (!interval) interval = 500;
    var startTime = Date.now();
    var timer = setInterval(function () {
        if (conditionF()) {
            clearInterval(timer);
            callbackF(true);
        }

        if (maxTime) {
            if (Date.now() - startTime > maxTime) {
                callbackF(false);
            }
        }
    }, interval)
}