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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: How would using await be possible in an event handler content attribute?
Date: Fri, 05 May 2017 20:02:21 +0200
Organization: PointedEars Software (PES)
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Martin Honnen wrote:

> As far as I understand, to use the "await" operator
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await
> I need to declare the function containing it as "async" e.g.
> 
> async function foo(url) {
>    var response = await fetch(url);
>    var text = await response.text();
>    document.getElementById('input1').value = text;
> }

Boy, are they tweaking the language these days.
 
> I wonder whether there is any way inside HTML to specify that an event
> handler content attribute is not a function body but an "async" function
> body so that it is possible to use "await" inside the event handler
> content attribute.
> 
> If I simply use
> 
>    <input type="button" value="test"
>     onclick="var response = await fetch(location.href);">
> 
> I get an error "Unexpected identifier".
> 
> Is there any way to designate an event handler content attribute as an
> async function body?

I do not know of any.  The obvious solution might be

  onclick="(async function () {
    var response = await fetch(location.href);
  }())"

or

  onclick="async function blub () {
    var response = await fetch(location.href);
  }; blub();"

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