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Groups > comp.lang.javascript > #15776
| From | Tim Streater <timstreater@greenbee.net> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: XHR: Passing Parameters to a ready-state-change Function |
| Date | 2012-09-07 19:14 +0100 |
| Organization | Personal Software |
| Message-ID | <timstreater-DBAFA6.19140107092012@news.individual.net> (permalink) |
| References | <09ef48tfsgucbl7m49ggao3be5r0kb7v13@4ax.com> <k2akj4$bca$1@news.albasani.net> <hs9i48l1r77mh36nj9jq6jofp9h837o0pu@4ax.com> <timstreater-90133A.09150507092012@news.individual.net> <mf9k489u8j684s2unrfbaaq62idmti1dsi@4ax.com> |
In article <mf9k489u8j684s2unrfbaaq62idmti1dsi@4ax.com>,
Gene Wirchenko <genew@ocis.net> wrote:
> >By the way, as has been pointed out you need to check that status==200
> >also. You also need to set xhr = null when you've finished with it.
>
> I know about 200.
>
> Setting xhr to null? Why? I may well be using it again. The
> forms are CRUD and so there may be multiple transactions go to the
> server.
And each time you call your ajax function you'll get a new one. AIUI,
although my knowledge of closures is a bit limited, each one will live
forever unless you explicitly dump it when you've finished with it. By
setting it to null, it'll get garbage-collected subsequently.
Here's what I do (slightly simplified, as I log the status error rather
than just alert-ing):
function ajax (url, data, callbackFunction)
{
var request = window.XMLHttpRequest ? new XMLHttpRequest () : new
ActiveXObject ("MSXML2.XMLHTTP.3.0");
request.open ("post", url, true);
request.setRequestHeader ("Content-Type",
"application/x-www-form-urlencoded; charset=utf-8");
request.onreadystatechange = function ()
{
if (request.readyState!=4) return;
if (request.status==200 && request.responseText!="")
callbackFunction (request.responseText);
if (request.status!=200) alert ("Bad ajax status: " +
request.status);
request = null;
};
request.send (data);
}
--
Tim
"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted" -- Bill of Rights 1689
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XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-05 13:53 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Jim T. <x@y.z> - 2012-09-05 17:46 -0400
Re: XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-05 17:30 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Jim T. <x@y.z> - 2012-09-05 20:55 -0400
Re: XHR: Passing Parameters to a ready-state-change Function Jim T. <x@y.z> - 2012-09-05 21:43 -0400
Re: XHR: Passing Parameters to a ready-state-change Function Jim T. <x@y.z> - 2012-09-05 21:49 -0400
Re: XHR: Passing Parameters to a ready-state-change Function Stefan Weiss <krewecherl@gmail.com> - 2012-09-06 18:56 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-06 10:55 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-06 21:38 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-06 21:49 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-06 15:49 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-07 09:15 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-07 09:58 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-07 19:14 +0100
Re: XHR: Passing Parameters to a ready-state-change Function cezary.tomczyk@gmail.com - 2012-09-07 13:51 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-08 00:52 +0200
Re: XHR: Passing Parameters to a ready-state-change Function cezary.tomczyk@gmail.com - 2012-09-07 16:32 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-08 09:48 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-09-08 02:09 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-08 11:09 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-09-08 03:39 -0700
Re: XHR: Passing Parameters to a ready-state-change Function John G Harris <john@nospam.demon.co.uk> - 2012-09-08 15:00 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-07 23:44 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-07 23:08 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-08 00:46 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-08 11:11 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-08 14:21 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-08 17:06 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-08 20:41 +0200
Re: XHR: Passing Parameters to a ready-state-change Function Dr J R Stockton <reply1236@merlyn.demon.co.uk.invalid> - 2012-09-09 20:04 +0100
Re: XHR: Passing Parameters to a ready-state-change Function Gene Wirchenko <genew@ocis.net> - 2012-09-09 18:40 -0700
Re: XHR: Passing Parameters to a ready-state-change Function "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-09-10 07:21 +0000
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-10 09:03 +0100
Re: XHR: Passing Parameters to a ready-state-change Function "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-09-10 13:59 +0000
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-10 15:35 +0100
Re: XHR: Passing Parameters to a ready-state-change Function "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-09-10 22:42 +0000
Re: XHR: Passing Parameters to a ready-state-change Function Scott Sauyet <scott.sauyet@gmail.com> - 2012-09-11 10:09 -0700
Re: XHR: Passing Parameters to a ready-state-change Function Tim Streater <timstreater@greenbee.net> - 2012-09-11 22:42 +0100
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