Executing JavaScript when a specific portion of a webpage loads in the presence of AJAX: A guide

As I tackle a project that involves loading elements via AJAX within a CMS-type software, I find myself restricted in accessing the AJAX code and its callbacks.

One specific challenge I face is running my function only when a certain part of the page is loaded, but with the involvement of AJAX, this becomes more complex. What approach should I take in handling this situation?

Below is an excerpt from my JavaScript code (which works independently): Fiddle:

var personalitet = document.getElementById("personalitet").innerHTML;
document.getElementsByName("form[5553]")[0].value = personalitet;

I've attempted different methods such as:

document.getElementById("personalitet").onload = function() {

document.addEventListener("DOMContentLoaded", function(event) {

window.onload = function(){

However, none seem to work since the elements are not yet loaded when my script attempts to access them.

Answer №1

To detect changes in the document, consider utilizing a mutation observer.

var observer = new MutationObserver(function(mutations) {
    for (var i = 0; i < mutations.length; i++) {
        // CUSTOM ACTIONS HERE
        console.log(mutations[i].type);
    }   
});

var observeElements = {
    attributes: true, 
    childList: true, 
    characterData: true 
};

observer.observe(document.body, observeElements);

This method allows for tracking modifications within the body of the document. Explore more details on MutationObserver for advanced usage.

Note that this approach might not be suitable for rapid detections, and it is recommended to verify if your CMS can support the functionality without obstacles. Additionally, ensure that the final code line is executed before any mutations take place to ensure proper functioning.

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