Intercept (and examine) windows alert message in Javascript
I am trying to intercept the Windows Alert Message and decide whether to modify it (or to even to display it).
I have been working with the code below, but it is displaying the Alert first, then acting on "do something here".
I need to examine the Alert Message and either display as is, display a modified version or prevent it's display altogether.
Note: The solution only needs to work in Chrome
Thank you
(function() {
var proxied = window.alert;
window.alert = function() {
// do something here
return proxied.apply(this, arguments);
};
})();
I have been working with the code below, but it is displaying the Alert first, then acting on "do something here".
I need to examine the Alert Message and either display as is, display a modified version or prevent it's display altogether.
Note: The solution only needs to work in Chrome
Thank you
(function() {
var proxied = window.alert;
window.alert = function() {
// do something here
return proxied.apply(this, arguments);
};
})();
You may also need:
e.stopPropagation();
e.stopPropagation();
ASKER
Thank You.
I will experiment with this later in the day...
I will experiment with this later in the day...
ASKER CERTIFIED SOLUTION
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ASKER
Thank you.
I have worked with that code as well. However, it assumes that I am generating the alert (requires fallback).
My goal is to stop an erroneous Alert message from being shown, by intercepting, checking the message and blocking it if the a specific message). I am doing this because it will be several weeks before the code without the erroneous Alert will be pushed to production.
I have worked with that code as well. However, it assumes that I am generating the alert (requires fallback).
My goal is to stop an erroneous Alert message from being shown, by intercepting, checking the message and blocking it if the a specific message). I am doing this because it will be several weeks before the code without the erroneous Alert will be pushed to production.
so you need to include the code I've posted before anything else on your page. Then it will work as any call to "alert(...)" will be intercepted by your function.
ASKER
Thank you again.
I was over complicating it.
I was over complicating it.
window.old_alert = window.alert;
window.alert = function(message){
var myTestString = 'Bad Alert';
if (message == myTestString){
return;
}
old_alert(message);
};
Good to hear. Thanks for the points
e.preventDefault();
// do something here
return proxied.apply(this, arguments);
}