滑动门

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滑动门是一种利用CSS来控制自适应导航栏外观的一种技术。

当满足以下条件，则可能需要使用到滑动门技术：

1. 导航边框样式为非矩形，或者导航栏背景图片有阴影等装饰性效果。
2. 在未知文字数量的情况下，导航栏自动适应宽度。

在制作滑动门以前，您需要斟酌到底能不能用低成本的方法实现。不是所有的效果图上的自适应导航都能用滑动门来实现。壁如，当效果图上的文字使用了特殊效果（阴影，浮雕，外发光等等），因为无法通过修改xhtml中的文字,来达到修改图片上文字，因此，滑动门在这种情况下并不适用。

这张图片列举了何时该使用滑动门：

从图中可以找出规律，当背景图片垂直方向可以分成3部分，既可以使用滑动门，如不满足此条件，则可能会花费更大的成本（包括额外的className和更多的css规则）。

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开始制作滑动门

以下代码所需的背景图片： 文件:http://home.blueidea.com/attachment/200902/16/381636 123479339869Hd.gif.thumb.jpg

[[[首先，需要建立xhtml结构。一共有2种结构可供选择，查看这两种结构的优缺点：]]] 第一种：

无效的语言。

您需要指定一种语言，像这样: <source lang="html4strict">...</source>

语法高亮所支持的语言:

4cs, 6502acme, 6502kickass, 6502tasm, 68000devpac, abap, actionscript, actionscript3, ada, algol68, apache, applescript, apt_sources, arm, asm, asp, asymptote, autoconf, autohotkey, autoit, avisynth, awk, bascomavr, bash, basic4gl, bf, bibtex, blitzbasic, bnf, boo, c, c_loadrunner, c_mac, caddcl, cadlisp, cfdg, cfm, chaiscript, cil, clojure, cmake, cobol, coffeescript, cpp, cpp-qt, csharp, css, cuesheet, d, dcl, dcpu16, dcs, delphi, diff, div, dos, dot, e, ecmascript, eiffel, email, epc, erlang, euphoria, f1, falcon, fo, fortran, freebasic, freeswitch, fsharp, gambas, gdb, genero, genie, gettext, glsl, gml, gnuplot, go, groovy, gwbasic, haskell, haxe, hicest, hq9plus, html4strict, html5, icon, idl, ini, inno, intercal, io, j, java, java5, javascript, jquery, kixtart, klonec, klonecpp, latex, lb, ldif, lisp, llvm, locobasic, logtalk, lolcode, lotusformulas, lotusscript, lscript, lsl2, lua, m68k, magiksf, make, mapbasic, matlab, mirc, mmix, modula2, modula3, mpasm, mxml, mysql, nagios, netrexx, newlisp, nsis, oberon2, objc, objeck, ocaml, ocaml-brief, octave, oobas, oorexx, oracle11, oracle8, oxygene, oz, parasail, parigp, pascal, pcre, per, perl, perl6, pf, php, php-brief, pic16, pike, pixelbender, pli, plsql, postgresql, povray, powerbuilder, powershell, proftpd, progress, prolog, properties, providex, purebasic, pycon, pys60, python, q, qbasic, rails, rebol, reg, rexx, robots, rpmspec, rsplus, ruby, sas, scala, scheme, scilab, sdlbasic, smalltalk, smarty, spark, sparql, sql, stonescript, systemverilog, tcl, teraterm, text, thinbasic, tsql, typoscript, unicon, upc, urbi, uscript, vala, vb, vbnet, vedit, verilog, vhdl, vim, visualfoxpro, visualprolog, whitespace, whois, winbatch, xbasic, xml, xorg_conf, xpp, yaml, z80, zxbasic

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第二种：（推荐）

无效的语言。

您需要指定一种语言，像这样: <source lang="html4strict">...</source>

语法高亮所支持的语言:

4cs, 6502acme, 6502kickass, 6502tasm, 68000devpac, abap, actionscript, actionscript3, ada, algol68, apache, applescript, apt_sources, arm, asm, asp, asymptote, autoconf, autohotkey, autoit, avisynth, awk, bascomavr, bash, basic4gl, bf, bibtex, blitzbasic, bnf, boo, c, c_loadrunner, c_mac, caddcl, cadlisp, cfdg, cfm, chaiscript, cil, clojure, cmake, cobol, coffeescript, cpp, cpp-qt, csharp, css, cuesheet, d, dcl, dcpu16, dcs, delphi, diff, div, dos, dot, e, ecmascript, eiffel, email, epc, erlang, euphoria, f1, falcon, fo, fortran, freebasic, freeswitch, fsharp, gambas, gdb, genero, genie, gettext, glsl, gml, gnuplot, go, groovy, gwbasic, haskell, haxe, hicest, hq9plus, html4strict, html5, icon, idl, ini, inno, intercal, io, j, java, java5, javascript, jquery, kixtart, klonec, klonecpp, latex, lb, ldif, lisp, llvm, locobasic, logtalk, lolcode, lotusformulas, lotusscript, lscript, lsl2, lua, m68k, magiksf, make, mapbasic, matlab, mirc, mmix, modula2, modula3, mpasm, mxml, mysql, nagios, netrexx, newlisp, nsis, oberon2, objc, objeck, ocaml, ocaml-brief, octave, oobas, oorexx, oracle11, oracle8, oxygene, oz, parasail, parigp, pascal, pcre, per, perl, perl6, pf, php, php-brief, pic16, pike, pixelbender, pli, plsql, postgresql, povray, powerbuilder, powershell, proftpd, progress, prolog, properties, providex, purebasic, pycon, pys60, python, q, qbasic, rails, rebol, reg, rexx, robots, rpmspec, rsplus, ruby, sas, scala, scheme, scilab, sdlbasic, smalltalk, smarty, spark, sparql, sql, stonescript, systemverilog, tcl, teraterm, text, thinbasic, tsql, typoscript, unicon, upc, urbi, uscript, vala, vb, vbnet, vedit, verilog, vhdl, vim, visualfoxpro, visualprolog, whitespace, whois, winbatch, xbasic, xml, xorg_conf, xpp, yaml, z80, zxbasic

<ul id="navigation">
:<li><a href="http://bbs.blueidea.com/"><span>蓝色理想主站</span></a></li>
:<li><a href="http://bbs.blueidea.com/"><span>经典论坛</span></a></li>
:<li><a href="http://bbs.blueidea.com/"><span>维基</span></a></li>
:<li><a href="http://pages.blueidea.com/"><span>Think.Pages</span></a></li>
:<li><a href="http://desk.blueidea.com/"><span>桌面</a></span></li>
</ul>

[[[开始书写CSS代码]]]

CSS中的滑动门技术