How to use “setTimeout” to invoke object itself

Question

Why can\'t I use setTimeout in a javascript object?

Message = function () {

    ...
    ...        

    this.messageFactory = ...
    this.fee         


        

Answer 1

To answer your last question: "Why doesn`t it work if we do this":

Message = function () {

...
...        

this.messageFactory = ...
this.feedbackTag = document.getElementById('feedbackMessages');
// public function
this.addInfo = function (message) {
    var info = this.messageFactory.createInfo(message); // create a div
    this.feedbackTag.appendChild(info);

    delayRemove(info);

};
// private function
function delayRemove(obj) {
    var _this = this;
    setTimeout(function() { _this.feedbackTag.removeChild(info); }, 5000);
}}

It's not working because you are passing an undefined variable (info) instead of a defined variable (obj). Here is the corrected function:

function delayRemove(obj) {
var _this = this;
setTimeout(function() { _this.feedbackTag.removeChild(obj); }, 5000);}