Question

I’d like a short smallest possible javascript routine that when a mousedown occurs on a button it first responds just like a mouseclick and then if the user keeps the button pressed it responds as if the user was continously sending mouseclicks and after a while with the button held down acts as if the user was accelerating their mouseclicks…basically think of it like a keypress repeat with acceleration in time.
i.e. user holds down mouse button (x=call function) – x___x___x___x__x__x_x_x_x_xxxxxxx

Answer 1

function holdit(btn, action, start, speedup) {     var t;      var repeat = function () {         action();         t = setTimeout(repeat, start);         start = start / speedup;     }      btn.mousedown = function() {         repeat();     }      btn.mouseup = function () {         clearTimeout(t);     } };  /* to use */ holdit(btn, function () { }, 1000, 2); /* x..1000ms..x..500ms..x..250ms..x */