javascript - event listener for numeric string in any input or textarea? -


trying make greasemonkey script/chrome extension when enter first 4 numbers of credit card, opens new tab porn in distract me instead. me save money.

totally serious way - can done?

here's started:

$(function() {     $("html").on("keyup", "input", function() {         if(/^\d{4}$/.test(this.value)) {             //         }     }); });

it binds keyup listener input fields (including dynamically-created fields) checks field values 4 digits.


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