From b2c2e4c22c6a4fe151f02380d247cf3d9a9d5d1e Mon Sep 17 00:00:00 2001 From: Jakub Narebski Date: Sun, 24 Jan 2010 19:05:23 +0100 Subject: [PATCH] gitweb.js: Workaround for IE8 bug In Internet Explorer 8 (IE8) the 'blame_incremental' view, which uses JavaScript to generate blame info using AJAX, sometimes hang at the beginning (at 0%) of blaming, e.g. for larger files with long history like git's own gitweb/gitweb.perl. The error shown by JavaScript console is "Unspecified error" at char:2 of the following line in gitweb/gitweb.js: if (xhr.readyState === 3 && xhr.status !== 200) { Debugging it using IE8 JScript debuger shown that the error occurs when trying to access xhr.status (xhr is XMLHttpRequest object). Watch for xhr object shows 'Unspecified error.' as "value" of xhr.status, and trying to access xhr.status from console throws error. This bug is some intermittent bug, depending on XMLHttpRequest timing, as it doesn't occur in all cases. It is probably caused by the fact that handleResponse is called from timer (pollTimer), to work around the fact that some browsers call onreadystatechange handler only once for each state change, and not like required for 'blame_incremental' as soon as new data is available from server. It looks like xhr object is not properly initialized; still it is a bug to throw an error when accessing xhr.status (and not use 'null' or 'undefined' as value). Work around this bug in IE8 by using try-catch block when accessing xhr.status. Signed-off-by: Jakub Narebski Signed-off-by: Junio C Hamano --- gitweb/gitweb.js | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/gitweb/gitweb.js b/gitweb/gitweb.js index 2a25b7cc4..9c66928c4 100644 --- a/gitweb/gitweb.js +++ b/gitweb/gitweb.js @@ -779,7 +779,12 @@ function handleResponse() { } // the server returned error - if (xhr.readyState === 3 && xhr.status !== 200) { + // try ... catch block is to work around bug in IE8 + try { + if (xhr.readyState === 3 && xhr.status !== 200) { + return; + } + } catch (e) { return; } if (xhr.readyState === 4 && xhr.status !== 200) { -- 2.26.2