javascript - alert not displaying when using button onclick -

here's fiddle.

i'm trying make when click button alerts 'you tried search... ...whatever typed...!', button doesn't alert message.

i've tried using:

var = document.getelementbyid('input').value;     alert("you tried search " + + "!"); 

and still doesn't alert message, please answer?

your function inaccessible outside of it's closure. should

window.search = function() {     var = document.getelementbyid('input').value;     alert("you tried search " + + "!"); }