Changes between Version 1 and Version 2 of WikiHtml


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Feb 13, 2021 12:24:55 AM (4 years ago)
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trac
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  • WikiHtml

    v1 v2  
    11= Using HTML in Wiki Text =
    22
    3 Trac supports inserting HTML into any wiki context, accomplished using the HTML [wiki:WikiProcessors WikiProcessor].
    4 
    5 HTML support is built-in, and does not require installing any additional packages.
    6 
    7 == How to Use HTML ==
    8 To inform the wiki engine that a block of text should be treated as HTML, use the ''html'' processor.
    9 
    10 This example should explain:
     3Trac supports the display of HTML in any wiki context, by using the `#!html` [wiki:WikiProcessors WikiProcessor].
     4
     5However, this HTML has to be [http://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
     8Fortunately, for 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  {{{
     17  #!html
     18  <h1 style="text-align: right; color: blue">HTML Test</h1>
     19  }}}
     20  }}}
     21}}}
     22{{{#!td style="padding-left: 2em"
     23  {{{
     24  #!html
     25  <h1 style="text-align: right; color: blue">HTML Test</h1>
     26  }}}
     27}}}
     28
     29Note 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.
     30
     31The filtering is done by [http://genshi.edgewall.org/ Genshi] and the output will be a well-formed fragment of HTML. This means that you can no longer use two HTML blocks, one for opening a <div> and another for closing it, in order to wrap arbitrary wiki text.
     32The new way to wrap any wiki content inside a <div> is to use the `#!div` Wiki processor.
     33
     34== How to use `#!div` and `#!span` == #HowtoUseDivSpan
     35
     36||= Wiki Markup =||= Display =||
     37{{{#!td
     38  {{{
     39  {{{
     40  #!div class="important"
     41  **important** is a predefined class.
     42  }}}
     43  }}}
     44  {{{
     45  {{{
     46  #!div style="border: 1pt dotted; margin: 1em"
     47  **wikipage** is another predefined class that will
     48  be used when no class is specified.
     49  }}}
     50  }}}
     51  {{{
     52  {{{
     53  #!div class="compact" style="border: 1pt dotted; margin: 1em"
     54  **compact** is another predefined class reducing
     55  the padding within the `<div>` to a minimum.
     56  }}}
     57  }}}
     58  {{{
     59  {{{
     60  #!div class="wikipage compact" style="border: 1pt dotted"
     61  Classes can be combined (here **wikipage** and **compact**)
     62  which results in this case in reduced //vertical//
     63  padding but there's still some horizontal space for coping
     64  with headings.
     65  }}}
     66  }}}
     67  {{{
     68  {{{
     69  #!div class="" style="border: 1pt dotted; margin: 1em"
     70  Explicitly specifying no classes is //not// the same
     71  as specifying no class attribute, as this will remove
     72  the //wikipage// default class.
     73  }}}
     74  }}}
     75}}}
     76{{{#!td style="padding-left: 2em"
     77
     78  {{{
     79  #!div class="important"
     80  **important** is a predefined class.
     81  }}}
     82
     83  {{{
     84  #!div style="border: 1pt dotted; margin: 1em"
     85  **wikipage** is another predefined class that will
     86  be used when no class is specified.
     87  }}}
     88
     89  {{{
     90  #!div class="compact" style="border: 1pt dotted; margin: 1em"
     91  **compact** is another predefined class reducing
     92  the padding within the `<div>` to a minimum.
     93  }}}
     94
     95  {{{
     96  #!div class="wikipage compact" style="border: 1pt dotted"
     97  Classes can be combined (here **wikipage** and **compact**)
     98  which results in this case in reduced //vertical//
     99  padding but there's still some horizontal space for coping
     100  with headings.
     101  }}}
     102
     103  {{{
     104  #!div class="" style="border: 1pt dotted; margin: 1em"
     105  Explicitly specifying no classes is //not// the same
     106  as specifying no class attribute, as this will remove
     107  the //wikipage// default class.
     108  }}}
     109
     110}}}
     111
     112Note 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 the `site/style.css` file for example, see TracInterfaceCustomization#SiteAppearance.
     113
     114For spans, you should use the Macro call syntax:
     115||= Wiki Markup =||
     116{{{#!td
     117  {{{
     118  Hello
     119  [[span(''WORLD'' (click [#anchor here]), style=color: green; font-size: 120%, id=anchor)]]!
     120  }}}
     121}}}
     122|---------------------------------------------------------------------------------
     123||= Display =||
     124{{{#!td style="padding-left: 2em"
     125  Hello
     126  [[span(''WORLD'' (click [#anchor here]), style=color: green; font-size: 120%, id=anchor)]]!
     127}}}
     128
     129== How to use `#!td` and other table related processors == #Tables
     130
     131The `#!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.
     132
     133||= Wiki Markup =||= Display =||
     134{{{#!td
     135 {{{
     136 Simple 2x2 table with rich content:
     137 {{{#!th align=left
     138  - Left
     139  - Header
     140 }}}
     141 {{{#!th align=left
     142  - Right
     143  - Header
     144 }}}
     145 |----------------------------------
     146 {{{#!td style="background: #ffd"
     147  - Left
     148  - Content
     149 }}}
     150 {{{#!td style="vertical-align: top"
     151 !RightContent
     152 }}}
     153 |----------------------------------
     154 || ... and this can be mixed||\
     155 ||with pipe-based cells ||
     156 {{{#!td colspan=2
     157 Pick the style the more appropriate
     158 to your content
     159 
     160 See WikiFormatting#Tables for details
     161 on the pipe-based table syntax.
     162 }}}
     163 
     164 If one needs to add some
     165 attributes to the table itself...
     166 
     167 {{{
     168 #!table style="border:none;text-align:center;margin:auto"
     169   {{{#!tr ====================================
     170     {{{#!th style="border: none"
     171     Left header
     172     }}}
     173     {{{#!th style="border: none"
     174     Right header
     175     }}}
     176   }}}
     177   {{{#!tr ==== style="border: 1px dotted grey"
     178     {{{#!td style="border: none"
     179     1.1
     180     }}}
     181     {{{#!td style="border: none"
     182     1.2
     183     }}}
     184   }}}
     185   {{{#!tr ====================================
     186     {{{#!td style="border: none"
     187     2.1
     188     }}}
     189     {{{#!td
     190     2.2
     191     }}}
     192   }}}
     193 }}}
     194
     195
     196 }}}
     197}}}
     198{{{#!td valign=top
     199Simple 2x2 table with rich content:
     200{{{#!th align=left
     201 - Left
     202 - Header
     203}}}
     204{{{#!th align=left
     205 - Right
     206 - Header
     207}}}
     208|----------------------------------
     209{{{#!td style="background: #ffd"
     210 - Left
     211 - Content
     212}}}
     213{{{#!td style="vertical-align: top"
     214!RightContent
     215}}}
     216|----------------------------------
     217|| ... and this can be mixed||\
     218||with pipe-based cells ||
     219{{{#!td colspan=2
     220Pick the style the more appropriate
     221to your content
     222
     223See WikiFormatting#Tables for details
     224on the pipe-based table syntax.
     225}}}
     226
     227If one needs to add some
     228attributes to the table itself...
     229
    11230{{{
    12 #!html
    13 <pre class="wiki">{{{
    14 #!html
    15 &lt;h1 style="text-align: right; color: blue"&gt;HTML Test&lt;/h1&gt;
    16 }}}</pre>
    17 }}}
    18 
    19 Results in:
    20 {{{
    21 #!html
    22 <h1 style="text-align: right; color: blue">HTML Test</h1>
    23 }}}
    24 
    25 Note 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.
     231#!table style="border:none;text-align:center;margin:auto"
     232  {{{#!tr ====================================
     233    {{{#!th style="border: none"
     234    Left header
     235    }}}
     236    {{{#!th style="border: none"
     237    Right header
     238    }}}
     239  }}}
     240  {{{#!tr ==== style="border: 1px dotted grey"
     241    {{{#!td style="border: none"
     242    1.1
     243    }}}
     244    {{{#!td style="border: none"
     245    1.2
     246    }}}
     247  }}}
     248  {{{#!tr ====================================
     249    {{{#!td style="border: none"
     250    2.1
     251    }}}
     252    {{{#!td
     253    2.2
     254    }}}
     255  }}}
     256}}}
     257}}}
     258
     259Note 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.
     260
     261{{{#!table class=""
     262||= Wiki Markup =||= Display =||
     263 {{{#!td
     264  {{{
     265  {{{#!table class=""
     266  ||  0||  1||  2||
     267  || 10|| 20|| 30||
     268  || 11|| 22|| 33||
     269  ||||||=  numbers  =||
     270  }}}
     271  }}}
     272 }}}
     273 {{{#!td
     274  {{{#!table class=""
     275  ||  0||  1||  2||
     276  || 10|| 20|| 30||
     277  || 11|| 22|| 33||
     278  ||||||=  numbers  =||
     279  }}}
     280 }}}
     281}}}
     282
     283Other classes can be specified as alternatives (remember that you can define your own in [TracInterfaceCustomization#SiteAppearance site/style.css]).
     284
     285||= Wiki Markup =||= Display =||
     286{{{#!td
     287  {{{
     288  {{{#!table class="listing"
     289  ||  0||  1||  2||
     290  || 10|| 20|| 30||
     291  || 11|| 22|| 33||
     292  ||||||=  numbers  =||
     293  }}}
     294  }}}
     295}}}
     296{{{#!td
     297  {{{#!table class="listing"
     298  ||  0||  1||  2||
     299  || 10|| 20|| 30||
     300  || 11|| 22|| 33||
     301  ||||||=  numbers  =||
     302  }}}
     303}}}
     304
     305== HTML comments ==
     306HTML 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:
     307||= Wiki Markup =||
     308{{{#!td
     309  {{{
     310  {{{
     311  #!htmlcomment
     312  This block is translated to an HTML comment.
     313  It can contain <tags> and &entities; that will not be escaped in the output.
     314  }}}
     315  }}}
     316}}}
     317|---------------------------------------------------------------------------------
     318||= Display =||
     319{{{#!td
     320  {{{
     321  <!--
     322  This block is translated to an HTML comment.
     323  It can contain <tags> and &entities; that will not be escaped in the output.
     324  -->
     325  }}}
     326}}}
     327
     328Please note that the character sequence "`--`" is not allowed in HTML comments, and will generate a rendering error.
     329
    26330
    27331== More Information ==