Tips for postponing a function's execution in order to ensure it has completely loaded

I am facing an issue with a dynamic page that is populated by an ajax call. Here is the current code snippet:

function loadPage() {
      var container = document.querySelector(".container");

      var xhr = new XMLHttpRequest();
      xhr.open('GET', ("data.html"), true);
      xhr.addEventListener("load", function(){
        container.innerHTML = xhr.response; 
        var noticeBar = document.querySelector("#noticeBar"); //this element is from data.html which was just loaded into the DOM.        
    });
    xhr.send();
}

Whenever I try to do something like this:

 function xyz(){
  loadPage().
  noticeBar.innerHTML = "bla bla bla"; //this doesn't work because the DOM hasn't fully loaded yet

}

I am in search of a solution to make this process synchronous.

Answer №1

Integrate a callback parameter into the loadpage() function:

function loadpage(callbackFunction) {
      var container = document.querySelector(".container");

      var xhr = new XMLHttpRequest();
      xhr.open('GET', ("data.html"), true);
      xhr.addEventListener("load", function(){
        container.innerHTML = xhr.response; 
        var noticeBar = document.querySelector("#noticeBar"); //this element is loaded from data.html
        callbackFunction(noticeBar);   
    });
    xhr.send();
}

Incorporate a callback function during the function call:

function customCallback(){
  loadpage(
    function(noticeBar) {
      noticeBar.innerHTML = "Insert your message here";
    }
  );
}

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