trim_js
The `trim_js` directive enables the trimming of unnecessary whitespace and comments from inline JavaScript in HTML responses.
Description
The trim_js directive is a part of the ngx_http_trim_filter module, which is designed to optimize HTML responses by stripping out unnecessary whitespace and comments, specifically from inline JavaScript code. When trim_js is enabled, the module employs a state machine to parse through the HTML content. This allows it to identify JavaScript sections within <script> tags and effectively eliminate superfluous spaces, line breaks, and comments while ensuring that the functional aspects of the JavaScript code remain intact. This is particularly useful in reducing the size of HTML responses, thereby potentially improving load times and efficiency.
In terms of configuration, the trim_js directive can be set to either on or off, allowing for flexibility based on the specific needs of the application. If it is enabled, the directive will work in conjunction with the main HTML trimming functionalities and can also respect conditions defined in the broader trim module contexts. It is important to note that the directive will not function if the request URL contains the parameter http_trim=off, as this will disable the entire trimming functionality for that request, overriding the configured directive settings.
Config Example
location / {
trim on;
trim_js on;
trim_css on;
}Ensure that the whole trim feature is enabled for trim_js to take effect; otherwise, it will not be applied.
If the http_trim=off parameter is present in the request, the trimming, including trim_js, will not occur.