Insert Function Only If It Doesn’t Exist

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The "window.showModalDialog" function exists in some versions of IE, but does not exist in Chrome, I would like to insert it if it does not exist. How can I do that? 

window.showModalDialog = function (arg1, arg2, arg3) { 
//Minha função
}
javascript

1 answer

3


This functionality is not standardized, is deprecated, and should be avoided.

I think you pose different questions here, and interesting to separate.

How/when to apply a polyfill

You can detect if the function exists and if it does not exist apply a function of yours with similar behavior. Something like:

if (!window.showModalDialog) window.showModalDialog = function(){
    // etc ...

How to play this feature (ie how to create a polyfill for this method)?

That exists now and you can find it on Github here: https://github.com/niutech/showModalDialog

TO MDN also points out to that repository you have a demo here.

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