How do I Scroll parent page to top when child page is click within iframe?

Question

When someone clicks on a link within an iframe (child page), how do I get the parent page to scroll to the top? The issue is the child page will remain in the same spot of t

Answer 1

If you have cross origins (the iframe and the parent have different domains), then just calling window.scrollTo(0,0) won't work.

One solution to cross-origin is to send a trusted message from the iframe to the parent.

Code inside the iframe:

var parent_origin = 'http://your/iframe/domain/here'
parent.postMessage({'task': 'scroll_top'}, parent_origin);

Then code in the parent:

function handleMessage(event) {
    var accepted_origin = 'http://your/iframe/domain/here';
    if (event.origin == accepted_origin){
        if (event.data['task'] == 'scroll_top'){
           window.scrollTo(0,0);
        }
        // you can have more tasks
    } else{
        console.error('Unknown origin', event.origin);
    }
}

window.onload = function() {
    window.addEventListener("message", handleMessage, false);
}