Dm library contains View Helpers: compressScript and compressStyle, which provide you possibility to pack all head files to minifyed one for reducing number of HTTP requests. For using it you don't have to change your application code, just change lines with adding head scripts and styles in main layout, so it's rather easy to use this not only for new, but even for already worked projects.
License: MIT, see MIT-LICENSE.txt file for more information.
Prototype for this helper comes from here
But there were some great problems with given code:
- no testing facilities cause of using $_SERVER array
- hard to change rules for folders mapping when additional domains/CDN are used
- several bags with static variables using
- many code repeats
- etc...
So, I rewrite full code of this helper to make it more flexible and stable, but great thanks previous author for idea and first steps!
For reusing this library in your application do next:
Copy directories library/Dm/*, library/Tools/* to you libraries directory
Add following lines to application.ini file (or do the same configuration via Bootstrap):
;; Set autoloading for DM library
autoloaderNamespaces[] = "Dm"
;; Add new path for finding view helpers
resources.view.helperPath.Dm_View_Helper = APPLICATION_PATH "/../library/Dm/View/Helper"
Create folder for handling cached JS and CSS files. This folder should be available for webserver, follow directories will be used as default:
- public/cache/js for scripts
- public/cache/css for styles
Give this directories 0777 permissions.
If you already use headScript() view helper for adding JS files on HTML page, pass this step.
In other case, start to do this. Any way you have to get something like this:
<?php $this->headScript()->appendFile($this->baseUrl('js/jquery.js')); ?>
<?php $this->headScript()->appendFile($this->baseUrl('js/jquery.prettyPhoto.js')); ?>
No matter where you have done this: in controller, view script or in layout.
You can find more information on headScript() helper here
To append link to compressed JS files to head section, add follow line between <head></head> tags:
<?php echo $this->compressScript() ?>
The same with css files appending:
<?php $this->headLink()->appendStylesheet($this->baseUrl('styles/style.css')); ?>
<?php $this->headLink()->appendStylesheet($this->baseUrl('styles/jquery.prettyPhoto.css')); ?>
And than
<?php echo $this->compressStyle() ?>
In package you can find test classes for helper's unit testing. You can add new test cases if necessary. Also, if you will launch full copy of this repository as web project, you have to see on web page test string:
"If you see this words on red background, than both of compressors work well!"
If it's true - everything is alright =) (helpers merge 3 js- and 3 css- files).
For making your site faster, you can compress this files using gzip and set server headers for client caching. This helpers don't gzip content of cache files cause of several problems with this in some browsers. But you can easy add gzipping on your web server, according to client-side request.
For Apache, you can use this configuration:
# css, js gzip compression
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE text/javascript
AddOutputFilterByType DEFLATE application/x-javascript
# max compression
DeflateCompressionLevel 9
DeflateWindowSize 15
DeflateBufferSize 32768
# Expires, static content will be cached on client side for 10 year
ExpiresActive On
ExpiresDefault "access plus 10 years"
<FilesMatch \.(html|xhtml|xml|shtml|phtml|php)$>
ExpiresActive Off
</FilesMatch>
# ETag for images, js, css
FileETag none
<FilesMatch \.(js|css|gif|png|jpg|swf)$>
FileETag MTime Size
</FilesMatch>
For using gzcompressed files with browser, which supported gzipping, you can add following lines in .htaccess files:
(example given by Andrei Fedarenchyk)
<files *.js.gz>
AddType "text/javascript" .gz
AddEncoding gzip .gz
</files>
<files *.css.gz>
AddType "text/css" .gz
AddEncoding gzip .gz
</files>
# Check to see if browser can accept gzip files.
RewriteCond %{HTTP:accept-encoding} gzip
RewriteCond %{HTTP_USER_AGENT} !Safari
# Make sure there's no trailing .gz on the url
RewriteCond %{REQUEST_FILENAME} !^.+\.gz$
# Check to see if a .gz version of the file exists.
RewriteCond %{REQUEST_FILENAME}.gz -f
# All conditions met so add .gz to URL filename (invisibly)
RewriteRule ^(.+) $1.gz [QSA,L]
For Nginx, use this:
gzip on;
# For using gzip_static module you have to configure nginx with special key
# to get more information on this, pls, don't hesitate to use google
gzip_static on;
gzip_http_version 1.1;
gzip_disable "MSIE [1-6]\.";
gzip_types text/plain text/html text/css application/x-javascript text/javascript;
gzip_vary on;
gzip_comp_level 9;
gzip_proxied any;
For other web servers you can quickly find information in Internet.