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<!DOCTYPE html> <html> <head> <title>Call a JavaScript Function From a String With window variable</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <script> // Define a method function testFunc(str) { return "Hello: " + str; } $(function (){ $("#btn").click(function (){ var params = $("#name").val(); // Call the method var funcName = "testFunc"; if (window[funcName] != null && typeof window[funcName] === "function") { var ret = window[funcName](params); // Output $("#result").text(ret); } }); }); </script> </head> <body> <div> <input type="text" id="name" placeholder="Input a name" /> <button id="btn">Start</button> </div> <div id="result"></div> </body> </html>