Changes between Initial Version and Version 1 of WikiHtml


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Jun 29, 2024, 3:20:05 PM (6 months ago)
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trac
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  • WikiHtml

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