Capture text displayed on JavaScript Alert message

Question

Presently I don't know whether it is possible or not?

One of my scenario I want to capture text which will displayed in alert box on third party websites by injecting my JavaScript file.

Is there any way to capture / retrieve text content displayed on alert message box using JavaScript?

Answer 1

You can try shadowing the alert function:

window.alert = (function(al) {
    return function(text) {
        // your stuff here...
        al(text);
    };
})(window.alert);