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Changes between Initial Version and Version 1 of WikiHtml


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Timestamp:
Oct 4, 2013, 12:00:50 PM (12 years ago)
Author:
trac
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  • WikiHtml

    v1 v1  
     1= Using HTML in Wiki Text =
     2
     3Trac supports inserting HTML into any wiki context, accomplished using the `#!html` [wiki:WikiProcessors WikiProcessor].
     4
     5However a constraint is that this HTML has to be well-formed.
     6In particular you can't insert a start tag in an `#!html` block,
     7resume normal wiki text and insert the corresponding end tag in a
     8second `#!html` block.
     9
     10Fortunately, for creating styled <div>s, <span>s  or even complex tables
     11containing arbitrary Wiki text, there's a powerful alternative: use of
     12dedicated `#!div`, `#!span` and `#!table`, `#!tr`, `#!td` and `#!th` blocks.
     13
     14Those Wiki processors are built-in, and does not require installing any additional packages.
     15
     16== How to use `#!html` == #HowtoUseHTML
     17To inform the wiki engine that a block of text should be treated as HTML, use the ''html'' processor.
     18
     19||= Wiki Markup =||= Display =||
     20{{{#!td
     21  {{{
     22  {{{
     23  #!html
     24  <h1 style="text-align: right; color: blue">HTML Test</h1>
     25  }}}
     26  }}}
     27}}}
     28{{{#!td style="padding-left: 2em"
     29  {{{
     30  #!html
     31  <h1 style="text-align: right; color: blue">HTML Test</h1>
     32  }}}
     33}}}
     34
     35Note that Trac sanitizes your HTML code before displaying it. That means that if you try to use potentially dangerous constructs such as Javascript event handlers, those will be removed from the output.
     36
     37Since 0.11, the filtering is done by Genshi, and as such, the produced output will be a well-formed fragment of HTML. As noted above in the introduction, this mean that you can no longer use two HTML blocks, one for opening a <div>, the second for closing it, in order to wrap arbitrary wiki text.
     38The new way to wrap any wiki content inside a <div> is to use the `#!div` Wiki  processor.
     39
     40== How to use `#!div` and `#!span` == #HowtoUseDivSpan
     41
     42||= Wiki Markup =||= Display =||
     43{{{#!td
     44  {{{
     45  {{{
     46  #!div class="important"
     47  **important** is a predefined class.
     48  }}}
     49  }}}
     50  {{{
     51  {{{
     52  #!div style="border: 1pt dotted; margin: 1em"
     53  **wikipage** is another predefined class that will
     54  be used when no class is specified.
     55  }}}
     56  }}}
     57  {{{
     58  {{{
     59  #!div class="compact" style="border: 1pt dotted; margin: 1em"
     60  **compact** is another predefined class reducing
     61  the padding within the `<div>` to a minimum.
     62  }}}
     63  }}}
     64  {{{
     65  {{{
     66  #!div class="wikipage compact" style="border: 1pt dotted"
     67  Classes can be combined (here **wikipage** and **compact**)
     68  which results in this case in reduced //vertical//
     69  padding but there's still some horizontal space for coping
     70  with headings.
     71  }}}
     72  }}}
     73  {{{
     74  {{{
     75  #!div class="" style="border: 1pt dotted; margin: 1em"
     76  Explicitly specifying no classes is //not// the same
     77  as specifying no class attribute, as this will remove
     78  the //wikipage// default class.
     79  }}}
     80  }}}
     81}}}
     82{{{#!td style="padding-left: 2em"
     83
     84  {{{
     85  #!div class="important"
     86  **important** is a predefined class.
     87  }}}
     88
     89  {{{
     90  #!div style="border: 1pt dotted; margin: 1em"
     91  **wikipage** is another predefined class that will
     92  be used when no class is specified.
     93  }}}
     94
     95  {{{
     96  #!div class="compact" style="border: 1pt dotted; margin: 1em"
     97  **compact** is another predefined class reducing
     98  the padding within the `<div>` to a minimum.
     99  }}}
     100
     101  {{{
     102  #!div class="wikipage compact" style="border: 1pt dotted"
     103  Classes can be combined (here **wikipage** and **compact**)
     104  which results in this case in reduced //vertical//
     105  padding but there's still some horizontal space for coping
     106  with headings.
     107  }}}
     108
     109  {{{
     110  #!div class="" style="border: 1pt dotted; margin: 1em"
     111  Explicitly specifying no classes is //not// the same
     112  as specifying no class attribute, as this will remove
     113  the //wikipage// default class.
     114  }}}
     115
     116}}}
     117
     118Note that the contents of a `#!div` block are contained in one or more paragraphs, which have a non-zero top and bottom margin. This leads to the top and bottom padding in the example above. To remove the top and bottom margin of the contents, add the `compact` class to the `#!div`. Another predefined class besides `wikipage` and `compact` is `important`, which can be used to make a paragraph stand out. Extra CSS classes can be defined via the `site/style.css` file for example, see TracInterfaceCustomization#SiteAppearance.
     119
     120For spans, you should rather use the Macro call syntax:
     121||= Wiki Markup =||
     122{{{#!td
     123  {{{
     124  Hello
     125  [[span(''WORLD'' (click [#anchor here]), style=color: green; font-size: 120%, id=anchor)]]!
     126  }}}
     127}}}
     128|---------------------------------------------------------------------------------
     129||= Display =||
     130{{{#!td style="padding-left: 2em"
     131  Hello
     132  [[span(''WORLD'' (click [#anchor here]), style=color: green; font-size: 120%, id=anchor)]]!
     133}}}
     134
     135== How to use `#!td` and other table related processors == #Tables
     136
     137`#!td` or `#!th` processors are actually the main ones, for creating table data and header cells, respectively. The other processors `#!table` and `#!tr` are not required for introducing a table structure, as `#!td` and `#!th` will do this automatically. The `|-` row separator can be used to start a new row when needed, but some may prefer to use a `#!tr` block for that, as this introduces a more formal grouping and offers the possibility to use an extra level of indentation. The main purpose of the `#!table` and `#!tr` is to give the possibility to specify HTML attributes, like ''style'' or ''valign'' to these elements.
     138
     139||= Wiki Markup =||= Display =||
     140{{{#!td
     141 {{{
     142 Simple 2x2 table with rich content:
     143 {{{#!th align=left
     144  - Left
     145  - Header
     146 }}}
     147 {{{#!th align=left
     148  - Right
     149  - Header
     150 }}}
     151 |----------------------------------
     152 {{{#!td style="background: #ffd"
     153  - Left
     154  - Content
     155 }}}
     156 {{{#!td style="vertical-align: top"
     157 !RightContent
     158 }}}
     159 |----------------------------------
     160 || ... and this can be mixed||\
     161 ||with pipe-based cells ||
     162 {{{#!td colspan=2
     163 Pick the style the more appropriate
     164 to your content
     165 
     166 See WikiFormatting#Tables for details
     167 on the pipe-based table syntax.
     168 }}}
     169 
     170 If one needs to add some
     171 attributes to the table itself...
     172 
     173 {{{
     174 #!table style="border:none;text-align:center;margin:auto"
     175   {{{#!tr ====================================
     176     {{{#!th style="border: none"
     177     Left header
     178     }}}
     179     {{{#!th style="border: none"
     180     Right header
     181     }}}
     182   }}}
     183   {{{#!tr ==== style="border: 1px dotted grey"
     184     {{{#!td style="border: none"
     185     1.1
     186     }}}
     187     {{{#!td style="border: none"
     188     1.2
     189     }}}
     190   }}}
     191   {{{#!tr ====================================
     192     {{{#!td style="border: none"
     193     2.1
     194     }}}
     195     {{{#!td
     196     2.2
     197     }}}
     198   }}}
     199 }}}
     200
     201
     202 }}}
     203}}}
     204{{{#!td valign=top
     205Simple 2x2 table with rich content:
     206{{{#!th align=left
     207 - Left
     208 - Header
     209}}}
     210{{{#!th align=left
     211 - Right
     212 - Header
     213}}}
     214|----------------------------------
     215{{{#!td style="background: #ffd"
     216 - Left
     217 - Content
     218}}}
     219{{{#!td style="vertical-align: top"
     220!RightContent
     221}}}
     222|----------------------------------
     223|| ... and this can be mixed||\
     224||with pipe-based cells ||
     225{{{#!td colspan=2
     226Pick the style the more appropriate
     227to your content
     228
     229See WikiFormatting#Tables for details
     230on the pipe-based table syntax.
     231}}}
     232
     233If one needs to add some
     234attributes to the table itself...
     235
     236{{{
     237#!table style="border:none;text-align:center;margin:auto"
     238  {{{#!tr ====================================
     239    {{{#!th style="border: none"
     240    Left header
     241    }}}
     242    {{{#!th style="border: none"
     243    Right header
     244    }}}
     245  }}}
     246  {{{#!tr ==== style="border: 1px dotted grey"
     247    {{{#!td style="border: none"
     248    1.1
     249    }}}
     250    {{{#!td style="border: none"
     251    1.2
     252    }}}
     253  }}}
     254  {{{#!tr ====================================
     255    {{{#!td style="border: none"
     256    2.1
     257    }}}
     258    {{{#!td
     259    2.2
     260    }}}
     261  }}}
     262}}}
     263}}}
     264
     265Note that by default tables are assigned the "wiki" CSS class, which gives a distinctive look to the header cells and a default border to the table and cells (as can be seen for the tables on this page). By removing this class (`#!table class=""`), one regains complete control on the table presentation. In particular, neither the table, the rows nor the cells will have a border, so this is a more effective way to get such an effect than having to specify a `style="border: no"` parameter everywhere.
     266
     267{{{#!table class=""
     268||= Wiki Markup =||= Display =||
     269 {{{#!td
     270  {{{
     271  {{{#!table class=""
     272  ||  0||  1||  2||
     273  || 10|| 20|| 30||
     274  || 11|| 22|| 33||
     275  ||||||=  numbers  =||
     276  }}}
     277  }}}
     278 }}}
     279 {{{#!td
     280  {{{#!table class=""
     281  ||  0||  1||  2||
     282  || 10|| 20|| 30||
     283  || 11|| 22|| 33||
     284  ||||||=  numbers  =||
     285  }}}
     286 }}}
     287}}}
     288
     289Other classes can be specified as alternatives (remember that you can define your own in [TracInterfaceCustomization#SiteAppearance site/style.css]).
     290
     291||= Wiki Markup =||= Display =||
     292{{{#!td
     293  {{{
     294  {{{#!table class="listing"
     295  ||  0||  1||  2||
     296  || 10|| 20|| 30||
     297  || 11|| 22|| 33||
     298  ||||||=  numbers  =||
     299  }}}
     300  }}}
     301}}}
     302{{{#!td
     303  {{{#!table class="listing"
     304  ||  0||  1||  2||
     305  || 10|| 20|| 30||
     306  || 11|| 22|| 33||
     307  ||||||=  numbers  =||
     308  }}}
     309}}}
     310
     311
     312== HTML comments ==
     313HTML comments are stripped from the output of the `html` processor. To add an HTML comment to a wiki page, use the `htmlcomment` processor (available since 0.12). For example, the following code block:
     314||= Wiki Markup =||
     315{{{#!td
     316  {{{
     317  {{{
     318  #!htmlcomment
     319  This block is translated to an HTML comment.
     320  It can contain <tags> and &entities; that will not be escaped in the output.
     321  }}}
     322  }}}
     323}}}
     324|---------------------------------------------------------------------------------
     325||= Display =||
     326{{{#!td
     327  {{{
     328  <!--
     329  This block is translated to an HTML comment.
     330  It can contain <tags> and &entities; that will not be escaped in the output.
     331  -->
     332  }}}
     333}}}
     334
     335Please note that the character sequence "`--`" is not allowed in HTML comments, and will generate a rendering error.
     336
     337
     338== More Information ==
     339
     340 * http://www.w3.org/ -- World Wide Web Consortium
     341 * http://www.w3.org/MarkUp/ -- HTML Markup Home Page
     342
     343----
     344See also:  WikiProcessors, WikiFormatting, WikiRestructuredText