I've seen code like this:
JHtml::_("script", "path/to/script.js");
JHtml::_("stylesheet", "path/to/stylesheet.css");
JHtml::_("jquery.framework");
What does the underscore function do here?
Most of the time
JHtml::_("script", "path/to/script.js");
JHtml::_("stylesheet", "path/to/stylesheet.css");
JHtml::_("jquery.framework");
will call
JHtml::Script("path/to/script.js");
JHtml::Stylesheet("path/to/stylesheet.css");
JHtmlJquery::framework();
However there is a small difference between the two calls. The first one allows system plugins to override the core classes.
Example
Let's assume you don't like the JQuery version shipped with Joomla for some funny reason. You could now create a system plugin and in the onAfterInitialise event you just register a different method for the jquery.framework call. You can do that using JHtml::register('jquery.framework', 'ClassToLoad::MethodToCall')
Michael Babker has written an example plugin which would allow to change the loaded Bootstrap version. That may help to figure out how it works.
It's simply a shortcut, to save typing I suppose. The documentation calls it a class loader method.
JHtml::_("script", "path/to/script.js");
# is the same as:
JHtml::script("path/to/script.js");
JHtml::_("stylesheet", "path/to/stylesheet.css");
# is the same as:
JHtml::stylesheet("path/to/stylesheet.css");
JHtml::_("jquery.framework");
# is the same as:
require_once 'libraries/cms/html/jquery.php';
JHtmlJquery::framework();
There's an algorithm that transforms the first argument to the correct function name, you can have a look a the source code in the file libraries/cms/html/html.php.
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3JHtml::_('script') is not exactly the same as JHtml::script(). The first one allows system plugin to override the core methods. Michael Babker did some example plugin here: github.com/mbabker/bs3-demo/blob/master/plg_system_bootstrap3/… – Bakual Jun 18 '15 at 19:18
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1@Bakual - definitely write this as an answer. I've been waiting a long time to know this – Lodder Jun 19 '15 at 7:15
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1
Same like this
JHtml::_("script", "path/to/script.js");
JHTML::script('sample.js', 'templates/custom/js/');
JHtml::_("stylesheet", "path/to/stylesheet.css");
JHtml::stylesheet('com_search/search.css', array(), true);
JHtml::_("jquery.framework");
JHtml::jquery('jquery.ui');
JHtml::jquery('jquery.ui', array('sortable'));
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You can write in two ways for example JHtml::_("script", "path/to/script.js"); (here _ are there) or JHTML::script('sample.js', 'templates/custom/js/'); (here _ is replace to script) both are provide same answer – Jextn Jun 19 '15 at 9:19
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Your edit made it a bit clearer, but I'm still confused as to why loading
script.jsis the same as loadingsample.js. – Flimm Jun 22 '15 at 8:30 -
I suspect he meant to write JHtml::_("script", "templates/custom/js/sample.js"); -- the 'path/to' stuff is just boilerplate to be replaced by the actual path to the script file. The underscore method takes the first argument as the identifier for what it should load. – Arlen Jul 17 '19 at 14:40
