2018-04-18 03:12:21 +00:00
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.. _customization:
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Customization
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=============
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2017-11-30 17:09:48 +00:00
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Datasette provides a number of ways of customizing the way data is displayed.
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Custom CSS and JavaScript
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-------------------------
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When you launch Datasette, you can specify a custom metadata file like this::
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datasette mydb.db --metadata metadata.json
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2018-12-16 21:32:55 +00:00
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Your ``metadata.json`` file can include links that look like this::
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2017-11-30 17:09:48 +00:00
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{
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"extra_css_urls": [
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"https://simonwillison.net/static/css/all.bf8cd891642c.css"
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],
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"extra_js_urls": [
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"https://code.jquery.com/jquery-3.2.1.slim.min.js"
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]
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}
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The extra CSS and JavaScript files will be linked in the ``<head>`` of every page.
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You can also specify a SRI (subresource integrity hash) for these assets::
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{
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"extra_css_urls": [
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{
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"url": "https://simonwillison.net/static/css/all.bf8cd891642c.css",
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"sri": "sha384-9qIZekWUyjCyDIf2YK1FRoKiPJq4PHt6tp/ulnuuyRBvazd0hG7pWbE99zvwSznI"
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}
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],
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"extra_js_urls": [
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{
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"url": "https://code.jquery.com/jquery-3.2.1.slim.min.js",
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"sri": "sha256-k2WSCIexGzOj3Euiig+TlR8gA0EmPjuc79OEeY5L45g="
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}
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]
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}
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Modern browsers will only execute the stylesheet or JavaScript if the SRI hash
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2018-05-26 19:46:24 +00:00
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matches the content served. You can generate hashes using `www.srihash.org <https://www.srihash.org/>`_
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2017-11-30 17:09:48 +00:00
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Every default template includes CSS classes in the body designed to support
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custom styling.
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2017-12-09 18:33:14 +00:00
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The index template (the top level page at ``/``) gets this::
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2017-11-30 17:09:48 +00:00
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<body class="index">
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2017-12-09 18:33:14 +00:00
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The database template (``/dbname``) gets this::
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2017-11-30 17:09:48 +00:00
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<body class="db db-dbname">
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2017-12-09 18:33:14 +00:00
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The custom SQL template (``/dbname?sql=...``) gets this::
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2017-12-05 16:35:14 +00:00
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<body class="query db-dbname">
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2017-12-09 18:33:14 +00:00
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The table template (``/dbname/tablename``) gets::
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<body class="table db-dbname table-tablename">
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2017-12-09 18:33:14 +00:00
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The row template (``/dbname/tablename/rowid``) gets::
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<body class="row db-dbname table-tablename">
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2018-04-18 02:11:11 +00:00
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The ``db-x`` and ``table-x`` classes use the database or table names themselves if
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2017-11-30 17:09:48 +00:00
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they are valid CSS identifiers. If they aren't, we strip any invalid
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characters out and append a 6 character md5 digest of the original name, in
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order to ensure that multiple tables which resolve to the same stripped
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character version still have different CSS classes.
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2017-12-09 18:33:14 +00:00
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Some examples::
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"simple" => "simple"
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"MixedCase" => "MixedCase"
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"-no-leading-hyphens" => "no-leading-hyphens-65bea6"
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"_no-leading-underscores" => "no-leading-underscores-b921bc"
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"no spaces" => "no-spaces-7088d7"
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"-" => "336d5e"
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"no $ characters" => "no--characters-59e024"
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2018-04-18 02:11:11 +00:00
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``<td>`` and ``<th>`` elements also get custom CSS classes reflecting the
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database column they are representing, for example::
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<table>
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<thead>
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<tr>
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<th class="col-id" scope="col">id</th>
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<th class="col-name" scope="col">name</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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2018-04-18 02:35:03 +00:00
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<td class="col-id"><a href="...">1</a></td>
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<td class="col-name">SMITH</td>
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</tr>
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</tbody>
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</table>
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Custom templates
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----------------
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By default, Datasette uses default templates that ship with the package.
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You can over-ride these templates by specifying a custom ``--template-dir`` like
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this::
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datasette mydb.db --template-dir=mytemplates/
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Datasette will now first look for templates in that directory, and fall back on
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the defaults if no matches are found.
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It is also possible to over-ride templates on a per-database, per-row or per-
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table basis.
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The lookup rules Datasette uses are as follows::
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Index page (/):
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index.html
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Database page (/mydatabase):
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database-mydatabase.html
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database.html
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Custom query page (/mydatabase?sql=...):
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query-mydatabase.html
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query.html
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Canned query page (/mydatabase/canned-query):
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query-mydatabase-canned-query.html
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query-mydatabase.html
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query.html
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Table page (/mydatabase/mytable):
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table-mydatabase-mytable.html
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table.html
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Row page (/mydatabase/mytable/id):
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row-mydatabase-mytable.html
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row.html
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2017-12-07 06:11:22 +00:00
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Rows and columns include on table page:
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_table-table-mydatabase-mytable.html
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_table-mydatabase-mytable.html
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_table.html
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Rows and columns include on row page:
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_table-row-mydatabase-mytable.html
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_table-mydatabase-mytable.html
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_table.html
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2017-12-07 06:11:22 +00:00
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2017-11-30 17:09:48 +00:00
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If a table name has spaces or other unexpected characters in it, the template
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filename will follow the same rules as our custom ``<body>`` CSS classes - for
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example, a table called "Food Trucks" will attempt to load the following
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templates::
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table-mydatabase-Food-Trucks-399138.html
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table.html
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2017-12-09 21:47:32 +00:00
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You can find out which templates were considered for a specific page by viewing
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source on that page and looking for an HTML comment at the bottom. The comment
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will look something like this::
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<!-- Templates considered: *query-mydb-tz.html, query-mydb.html, query.html -->
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This example is from the canned query page for a query called "tz" in the
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database called "mydb". The asterisk shows which template was selected - so in
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this case, Datasette found a template file called ``query-mydb-tz.html`` and
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used that - but if that template had not been found, it would have tried for
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``query-mydb.html`` or the default ``query.html``.
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2017-11-30 17:09:48 +00:00
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It is possible to extend the default templates using Jinja template
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inheritance. If you want to customize EVERY row template with some additional
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content you can do so by creating a ``row.html`` template like this::
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{% extends "default:row.html" %}
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{% block content %}
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<h1>EXTRA HTML AT THE TOP OF THE CONTENT BLOCK</h1>
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<p>This line renders the original block:</p>
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{{ super() }}
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{% endblock %}
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2017-12-07 06:11:22 +00:00
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Note the ``default:row.html`` template name, which ensures Jinja will inherit
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from the default template.
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2019-07-03 00:50:45 +00:00
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The ``_table.html`` template is included on both the row and the table
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page, and displays the content of the row. The default ``_table.html`` template
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`can be seen here <https://github.com/simonw/datasette/blob/master/datasette/templates/_table.html>`_.
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2017-12-07 06:11:22 +00:00
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You can provide a custom template that applies to all of your databases and
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tables, or you can provide custom templates for specific tables using the
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template naming scheme described above.
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Say for example you want to output a certain column as unescaped HTML. You could
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provide a custom ``_table.html`` template like this::
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2017-12-07 06:11:22 +00:00
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<table>
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<thead>
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<tr>
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{% for column in display_columns %}
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<th scope="col">{{ column }}</th>
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{% endfor %}
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</tr>
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</thead>
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<tbody>
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{% for row in display_rows %}
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<tr>
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{% for cell in row %}
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<td>
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{% if cell.column == 'description' %}
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{{ cell.value|safe }}
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{% else %}
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{{ cell.value }}
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{% endif %}
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</td>
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{% endfor %}
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</tr>
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{% endfor %}
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</tbody>
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</table>
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