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Message-ID: <2567734.rclGbaif12@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 24 Nov 2011 21:27:43 +0100
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Subject: Re: Read url into a string?
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.javascript:8605

Zlatko Đurić wrote:

> function getJSONfromUrl(url) {
>    if (window.XMLHttpRequest) {
>      xhr=new XMLHttpRequest();
>    } else {
>      xhr=new ActiveXObject("Microsoft.XMLHTTP");
>    }
>    xhr.open("GET",url,false);
>    xhr.send();
>    return xhr.responseText;
> }
> 
> ?

The flaws of this code are many:

- Bogus XHR() feature test
- `xhr' not declared a variable
- Missing XHR() exception handling
- Missing ActiveXObject feature test
- Missing XMLHTTP selection
- Missing ActiveXObject() exception handling
- Missing non-XHR()-non-MSXML branch
- Unnecessary synchronous request blocking the client window/tab
- Missing send() argument
- Missing status check
- Insufficient code style

So it is neither safe nor compatible or user-friendly, but it might suffice 
for a first dry run.  `url' cannot be any URI though, as the Same Origin 
Policy would prevent cross-protocol/domain/port access unless the owner of 
the other site explicitly allowed it.

<https://developer.mozilla.org/En/HTTP_access_control>


PointedEars
-- 
var bugRiddenCrashPronePieceOfJunk = (
    navigator.userAgent.indexOf('MSIE 5') != -1
    && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16