Cross domain iframe issue

Question

For say i have a Site called example.com on which iframe is embedded of domain iframe.net, now i want to read the content of iframe and pass some parameter to display a text

Answer 1

It can happen only if you have control for both sites

you can use postMessage

here's how you can apply it

first, you can add the below code to the site you want to retrieve data from

the second step you can add this code below to the other domain you want to send a message or the data to it

 window.addEventListener("message", function (message) {
        if (message.origin == "http://firstdomain.com") {
            console.log(message)
        }
    });

and please note you must add the test() function on the onload attribute of the iframe cause if the function runs before the iframe was loaded it will become useless and it won't send data