IFrame src change event detection?

To detect if the src attribute of an iframe has changed, you can use JavaScript to add an event listener for the load event. When the iframe's content loads or reloads, the load event is triggered, at which point you can check if the src attribute has changed from the previously recorded value.

Here is an example implementation:

javascript
// Get the iframe element
var iframe = document.getElementById('myIframe');

// Record the current src
var currentSrc = iframe.src;

// Listen for the load event
iframe.addEventListener('load', function() {
    // Check if src has changed
    var newSrc = iframe.src;
    if (currentSrc !== newSrc) {
        console.log('iframe src has changed from ' + currentSrc + ' to ' + newSrc);
        // Update current src for the next comparison
        currentSrc = newSrc;
    }
});

Use the above JavaScript code with your iframe element, ensuring that you replace 'myIframe' with the actual ID of your iframe element.

Note that due to the same-origin policy, if the iframe content is cross-origin, you may not be able to access the src attribute inside the iframe. In this case, you need to use other cross-origin communication techniques, such as Window.postMessage. If the content loaded in the iframe is from a different origin than the parent page, you must rely on the page inside the iframe to send messages to the parent page to notify of changes to the src.