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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Why does savepng workl with eventlistener but not by call from form?
Date: Fri, 11 Nov 2016 16:08:16 +0100
Organization: PointedEars Software (PES)
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JJ wrote:

> On Thu, 10 Nov 2016 15:47:37 -0800 (PST), jonas.thornvall@gmail.com wrote:
>> But what does click() do, it can't start the eventhandler because it is
>> inside the function that will be called from the handler, restart?
> 
> click() simulates a click event.
> It's OOP, so click() belongs to anobject.
> So, anobject.click() clicks the anobject.

It is a proprietary, legacy method, though, not even defined in WHATWG HTML.  
The standards-compliant approach is to dispatch a synthetic “click” event to 
the element object.

This has become a lot easier since the UI Events Specification that 
deprecated the Event::init*Event() methods, with their insanely long 
parameter lists, in favor of proper constructors:

  anObject.dispatchEvent(new MouseEvent("click", {
    view: document.defaultView,
    bubbles: true,
    cancelable: true
  }));

[Formerly:

  var mouseEvent = document.createEvent("MouseEvents");
  mouseEvent.initMouseEvent("click", true, true, window,
    0, 0, 0, 0, 0, false, false, false, false, 0, null);
  anObject.dispatchEvent(mouseEvent);

Lesson to be learned: Design functions/methods to accept references to 
parameter/option objects, and not more than 5 arguments [unless it is a list 
of values of equal meaning, see e.g. Math.max()].  Otherwise nobody is going 
to remember the correct argument order, you will be sacrificing flexibility, 
and the caller’s code will look like Chinese (when they are not Chinese).]

<https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Creating_and_triggering_events> pp.

-- 
PointedEars
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