[PATCH 08 of 20] hgweb: add makeRequest javascript function

[Laurens Holst]

Op 09-08-13 20:57, Alexander Plavin schreef:
> # HG changeset patch
> # User Alexander Plavin <alexander at plav.in>
> # Date 1376061238 -14400
> #      Fri Aug 09 19:13:58 2013 +0400
> # Node ID d4cdebd1a84f65faa6a21ad275cc9394b03cdef7
> # Parent  f112e78a72dab869d57cad83ab40ece62163d517
> hgweb: add makeRequest javascript function
>
> This function performs an asynchronous HTTP request and calls provided
> callbacks:
> - onstart: request is sent
> - onsuccess: response is received and it's valid XML
> - onerror: some error occured
> - oncomplete: after response is fully processed and all callbacks finished
>
> diff -r f112e78a72da -r d4cdebd1a84f mercurial/templates/static/mercurial.js
> --- a/mercurial/templates/static/mercurial.js	Fri Aug 09 15:01:33 2013 +0400
> +++ b/mercurial/templates/static/mercurial.js	Fri Aug 09 19:13:58 2013 +0400
> @@ -299,3 +299,48 @@
>           return String(replacements[p1]);
>       });
>   }
> +
> +function makeRequest(url, method, onstart, onsuccess, onerror, oncomplete) {
> +    if (window.XMLHttpRequest) { // Chromium, Mozilla, Safari, ...
> +        xfr = new XMLHttpRequest();
> +    } else if (window.ActiveXObject) { // old IE
> +        try {
> +            xfr = new ActiveXObject("Msxml2.XMLHTTP");
> +        }
> +        catch (e) {
> +            try {
> +                xfr = new ActiveXObject("Microsoft.XMLHTTP");
> +            }
> +            catch (e) {
> +            }
> +        }
> +    }

Internet Explorer supports XMLHttpRequest() natively since version 7. So 
all this ActiveXObject stuff is not needed.

> +    if (!xfr) {
> +        throw "AJAX not supported";
> +    }
> +
> +    xfr.overrideMimeType('text/xml');
> +    xfr.onreadystatechange = function() {
> +        if (xfr.readyState === 4) {
> +            try {
> +                if (xfr.status === 200) {
> +                    if (xfr.responseXML === null) {
> +                        throw 'malformed XML response';
> +                    }
> +                    onsuccess(xfr.responseXML);
> +                } else {
> +                    throw 'server error';
> +                }
> +            } catch (e) {
> +                onerror(typeof e == 'string' ? e : 'unknown error');
> +            } finally {
> +                oncomplete();
> +            }
> +        }
> +    };
> +
> +    xfr.open(method, url);
> +    xfr.send();
> +    onstart();
> +    return xfr;
> +}
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