Hi,the nxhtml helps a lot.

But seems there is some problem,I found a line "File mode specification error: (void-function rails-minor-mode)" in the *Message* buffer,why?

thanks for the post.

(rails-minor-mode t)

Thanks Pluskid for your kindly reply!

Yes I finally found the reason,and now installed emacs-rails extension,and ecb/cedet,it seems wonderful to develop rails application with Emacs now!

没有绑定给yasnippet：

runs the command indent-for-tab-command
  which is an interactive compiled Lisp function in `indent.el'.
It is bound to .
(indent-for-tab-command &optional arg)

要是yasnippet能自动插入到这种复合模式中工作那就完美了。nxhtml-mode自带的自动完成功能不怎么好用，好像是用的是snippet.el，因为我对elisp很不熟，只好到处求助，可google出来的yasnippet相关信息太少了。如果你也很喜欢nxhtml-mode的话，能不能和它的作者沟通一下，把yasnippet作为它的默认tab complete？

@transtone, 汗……你把最关键的信息去掉了，我主要是想知道那里是 TAB 还是 。如果是后者的话，应该好解决，试试：

(add-hook 'nxhtml-mode-hook
          '(lambda ()
             (local-set-key [tab] 'yas/expand)))

恩，还有诸如 Emacs 的 rails 支持等好像都是用的 snippet ，等我有时间的时候也是得考虑一下和这些作者沟通一下，哈哈！ ^_^ 多谢支持！

不是我去掉的，是输入到Comment后自动去掉的。 是，<tab> 还不太清楚本博客支持的格式，bbcode吗？

 runs the command indent-for-tab-command
  which is an interactive compiled Lisp function in `indent.el'.
It is bound to .
(indent-for-tab-command &optional arg)
Indent line in proper way for current major mode or insert a tab.
Depending on `tab-always-indent', either insert a tab or indent.
If initial point was within line's indentation, position after
the indentation.  Else stay at same point in text.
The function actually called to indent is determined by the value of
`indent-line-function'.

添加了那个绑定，但还是无效。 都把这变成论坛了 :) 下面是C-h m 后的全部信息：

Enabled minor modes: Auto-Compression Column-Number Display-Time
Encoded-Kbd File-Name-Shadow Font-Lock Global-Font-Lock Hs Icomplete
Line-Number Menu-Bar Mlinks Mouse-Wheel Nxhtml Outline Shell-Dirtrack
Show-Paren Tabbar Tooltip Transient-Mark Unify-8859-On-Encoding
Utf-Translate-Cjk Yas/Minor
(Information about these minor modes follows the major mode info.)
nXhtml/nxhtml mode:
Major mode for editing XHTML documents.
It is based on `nxml-mode' and adds some features that are useful
when editing XHTML files.
To see an overview in html format do M-x nxhtml-overview.
* Note: Please observe that when loading nXhtml some file
  associations are done, see `nxhtml-auto-mode-alist'.
The nXhtml menu is added by this mode (or actually the minor
mode `nxhtml-minor-mode') and gives quick access and an overview
of some other important features. These includes:
- multiple major modes, see `define-mumamo-multi-major-mode'
- easy uploading and viewing of files, see for example
  `html-upl-upload-file'
- validation in XHTML part for php etc, see
  `nxhtml-validation-header-mode' (you probably also want to know about
  `nxhtml-toggle-visible-warnings' for this!)
- converting of html to xhtml, see `tidy-buffer'
The XML menu contains functionality added by `nxml-mode' (on
which this major mode is based).  There is also a popup menu
added to the [apps] key.
The most important features are probably completion and
validation, which is inherited from `nxml-mode' with some small
addtions.  In very many situation you can use completion. To
access it type . Completion has been enhanced in
the following way:
- If region is active and visible then completion will surround the
  region with the chosen tag's start and end tag.  However only the
  starting point is checked for validity. If something is wrong after
  insertion you will however immediately see it if you have validation
  on.
- It can in some cases give assistance with attribute values.
- Completion can be customized, see the menus XHTML - Completion:
  * You can use a menu popup style completion.
  * You can have alternatives grouped.
  * You can get a short help text shown for each alternative.
- There does not have to be a ', C-c RET  Move
        between underlined href/src attributes
C-c RET RET, Mouse-1 Follow link inside Emacs
        (if possible)
It is even a little bit quicker when the links are in an active
  state (marked with the face `isearch'):
, TAB Move
        between underlined href/src attributes
    RET, Mouse-1  Follow link inside Emacs (if possible)
If the link is not into a file that you can edit (a mailto link
  for example) you will be prompted for an alternative action.
* Creating links. To make it easier to create links to id/name
  attribute in different files there are two special
  functions:
C-c C-h c copy link to id/name (you must
        be in the tag to get the link)
    C-c C-h v paste this as an a-tag.
Here are all key bindings in nxhtml-mode itself:
key             binding
---             -------
C-c		Prefix Command
ESC		Prefix Command
/		nxml-electric-slash
	nxml-down-element
	nxml-backward-element
	nxml-forward-element
	nxml-backward-up-element
	nxml-complete
		nxml-complete
	nxml-mouse-hide-direct-text-content
		nxml-complete
C-c C-b		nxml-balanced-close-start-tag-block
C-c C-d		nxml-dynamic-markup-word
C-c C-f		rngalt-finish-element
C-c C-h		Prefix Command
C-c TAB		nxml-balanced-close-start-tag-inline
C-c RET		nxml-split-element
C-c C-n		rng-next-error
C-c C-o		Prefix Command
C-c C-p		Prefix Command
C-c C-q		nxhtml-quote-html
C-c C-s		Prefix Command
C-c C-u		nxml-insert-named-char
C-c C-v		rng-validate-mode
C-c C-x		nxml-insert-xml-declaration
C-c 	hs-mouse-toggle-hiding
C-c @		Prefix Command
C-c @ C-c	hs-toggle-hiding
C-c @ C-h	hs-hide-block
C-c @ C-l	hs-hide-level
C-c @ C-s	hs-show-block
C-c @ ESC	Prefix Command
C-c @ C-M-h	hs-hide-all
C-c @ C-M-s	hs-show-all
Icomplete minor mode (no indicator):
Toggle incremental minibuffer completion for this Emacs session.
With a numeric argument, turn Icomplete mode on if ARG is positive,
otherwise turn it off.
Line-Number minor mode (no indicator):
Toggle Line Number mode.
With arg, turn Line Number mode on if arg is positive, otherwise
turn it off.  When Line Number mode is enabled, the line number
appears in the mode line.
Line numbers do not appear for very large buffers and buffers
with very long lines; see variables `line-number-display-limit'
and `line-number-display-limit-width'.
Menu-Bar minor mode (no indicator):
Toggle display of a menu bar on each frame.
This command applies to all frames that exist and frames to be
created in the future.
With a numeric argument, if the argument is positive,
turn on menu bars; otherwise, turn off menu bars.
Mlinks minor mode (indicator L):
Recognizes certain parts of a buffer as hyperlinks.
The hyperlinks are created in different ways for different major
modes with the help of the functions in the list
`mlinks-mode-functions'.
The hyperlinks can be hilighted when the point is over them.
Use `mlinks-toggle-hilight' to toggle this feature for the
current buffer.
All keybindings in this mode are by default done under the prefi§x
key
C-c RET
which is supposed to be a kind of mnemonic for link (alluding to
the RET key commonly used in web browser to follow a link).
(Unfortunately this breaks the rules in info node `Key Binding
Conventions'.) Below are the key bindings defined by this mode:
key             binding
---             -------
C-c		Prefix Command
C-c RET		Prefix Command
C-c RET RET	mlinks-goto
C-c RET f	mlinks-goto-other-frame
C-c RET h	mlinks-toggle-hilight
C-c RET n	mlinks-next-saved-position
C-c RET p	mlinks-prev-saved-position
C-c RET w	mlinks-goto-other-window
C-c RET 			mlinks-backward-link
C-c RET 			mlinks-forward-link
For some major modes `mlinks-backward-link' and
`mlinks-forward-link' will take you to the previous/next link.
By default the link moved to will be active, see
`mlinks-active-links'.
Mouse-Wheel minor mode (no indicator):
Toggle mouse wheel support.
With prefix argument ARG, turn on if positive, otherwise off.
Return non-nil if the new state is enabled.
Nxhtml minor mode (no indicator):
Minor mode to turn on some key and menu bindings.
See `nxhtml-mode' for more information.
Outline minor mode (indicator Outl):
Toggle Outline minor mode.
With arg, turn Outline minor mode on if arg is positive, off otherwise.
See the command `outline-mode' for more information on this mode.
Shell-Dirtrack minor mode (no indicator):
Turn directory tracking on and off in a shell buffer.
The `dirtrack' package provides an alternative implementation of this
feature - see the function `dirtrack-mode'.
Show-Paren minor mode (no indicator):
Toggle Show Paren mode.
With prefix ARG, turn Show Paren mode on if and only if ARG is positive.
Returns the new status of Show Paren mode (non-nil means on).
When Show Paren mode is enabled, any matching parenthesis is highlighted
in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time.
Tabbar minor mode (no indicator):
Toggle display of a tab bar in the header line.
With prefix argument ARG, turn on if positive, otherwise off.
Returns non-nil if the new state is enabled.
Tooltip minor mode (no indicator):
Toggle Tooltip mode.
With ARG, turn Tooltip mode on if and only if ARG is positive.
When this minor mode is enabled, Emacs displays help text
in a pop-up window for buttons and menu items that you put the mouse on.
(However, if `tooltip-use-echo-area' is non-nil, this and
all pop-up help appears in the echo area.)
When Tooltip mode is disabled, Emacs displays one line of
the help text in the echo area, and does not make a pop-up window.
Transient-Mark minor mode (no indicator):
Toggle Transient Mark mode.
With arg, turn Transient Mark mode on if arg is positive, off otherwise.
In Transient Mark mode, when the mark is active, the region is highlighted.
Changing the buffer "deactivates" the mark.
So do certain other operations that set the mark
but whose main purpose is something else--for example,
incremental search, .
You can also deactivate the mark by typing C-g or
M-ESC ESC.
Many commands change their behavior when Transient Mark mode is in effect
and the mark is active, by acting on the region instead of their usual
default part of the buffer's text.  Examples of such commands include
M-;, M-x flush-lines, M-x keep-lines, M-%, C-M-%, M-x ispell, and C-_.
Invoke C-h d and type "transient" or
"mark.*active" at the prompt, to see the documentation of
commands which are sensitive to the Transient Mark mode.
Unify-8859-On-Encoding minor mode (no indicator):
Set up translation-tables for unifying ISO 8859 characters on encoding.
The ISO 8859 characters sets overlap, e.g. 8859-1 (Latin-1) and
8859-15 (Latin-9) differ only in a few characters.  Emacs normally
distinguishes equivalent characters from those ISO-8859 character sets
which are built in to Emacs.  This behavior is essentially inherited
from the European-originated international standards.  Treating them
equivalently, by translating to and from a single representation is
called `unification'.  (The `utf-8' coding system treats the
characters of European scripts in a unified manner.)
In this mode, on encoding -- i.e. output operations -- non-ASCII
characters from the built-in ISO 8859 and `mule-unicode-0100-24ff'
charsets are handled automatically by the coding system used if it can
represent them.  Thus, say, an e-acute from the Latin-1 charset (the
unified representation) in a buffer saved as Latin-9 will be encoded
directly to a byte value 233.  By default, in contrast, you would be
prompted for a general coding system to use for saving the file, which
can cope with separate Latin-1 and Latin-9 representations of e-acute.
Also sets hooks that arrange `translation-table-for-input' to be set
up locally.  This will often allow input generated by Quail input
methods to conform with what the buffer's file coding system can
encode.  Thus you could use a Latin-2 input method to search for
e-acute in a Latin-1 buffer.
See also command `unify-8859-on-decoding-mode'.
Utf-Translate-Cjk minor mode (no indicator):
Toggle whether UTF based coding systems de/encode CJK characters.
If ARG is an integer, enable if ARG is positive and disable if
zero or negative.  This is a minor mode.
Enabling this allows the coding systems mule-utf-8,
mule-utf-16le and mule-utf-16be to encode characters in the charsets
`korean-ksc5601', `chinese-gb2312', `chinese-big5-1',
`chinese-big5-2', `japanese-jisx0208' and `japanese-jisx0212', and to
decode the corresponding unicodes into such characters.
Where the charsets overlap, the one preferred for decoding is chosen
according to the language environment in effect when this option is
turned on: ksc5601 for Korean, gb2312 for Chinese-GB, big5 for
Chinese-Big5 and jisx for other environments.
This mode is on by default.  If you are not interested in CJK
characters and want to avoid some overhead on encoding/decoding
by the above coding systems, you can customize the user option
`utf-translate-cjk-mode' to nil.
Yas/Minor minor mode (indicator yas):
Toggle YASnippet mode.
With no argument, this command toggles the mode.
positive prefix argument turns on the mode.
Negative prefix argument turns off the mode.
When YASnippet mode is enabled, the TAB key
expands snippets of code depending on the mode.
You can customize the key through `yas/trigger-key'.

@transtone, 这样的，看那里开了好多的 minor-mode ，看样子好像 键被某个 mode 抢先了，我好像没有在 nxhtml-mode 的代码里找到相关的东西。你试试手工 M-x yas/expand ，如果能展开的话就是按键的问题，可以尝试这样：

(add-hook 'hxhtml-mode-hook
	  '(lambda ()
	     (make-variable-buffer-local 'yas/trigger-key)
	     (setq yas/trigger-key [tab])))

如果实在不行的话也许可以考虑换一个按键。