As stated by Rob Dodson, style tags are now unavoidable with Web Components. I am trying to find a way to use LESS with this new tecnhology without having to paste the compiled CSS in my HTML document everytime I change something in the LESS file . Is there anyway to achieve that?
I am using Polymer.
Thanks!
Laurent
You can make the client compile the LESS to CSS , you should definitely take a look at this :
http://lesscss.org/#client-side-usage
It is advised to compile it yourself to css in a production environment though !
Doing this client-side hardly seems like the corrent solution, especially at scale. For instance, do you really want 1000 web components in your app all including LessCSS and compiling on the client side?
Just compile server-side and include the compiled version in your html import. Apps like DocPad, make this a lot easier. For instance:
src/documents/components/my-component/my-component.css.less is your source file, and is compiled to out/components/my-component/my-component.css, which is accessible at /compoennt/my-component/my-component.css.
We use this workflow to also make use of javascript pre-processors like coffeescript, as well as post-processors like css auto prefixer, and bundlers like Browserify. See: https://stackoverflow.com/a/23050527/130638 for more info.
Simply compile your less and embed the generated CSS file via good old link tag.
I don't think that rob wanted to say that using style tags is the only way to go. You can still link to external stylesheets as you always did.
Why don´t you compile on server side using php compiler? Have a look here - http://leafo.net/lessphp/ -
To let you know, i´m using this compiler on my projects, on the server side without any kind of problems!!!!!!! :) IMO, it´s better to have the compilation work on the server side. I´m not totally 100% sure, but i think IE8 don´t recognize text/less
The way I have done this before is have individual .less or .scss file for each component and have it compile into the individual .css file which is then called into the respective component file. and finally vulcanize everything into a single file.
Incase you want to use a single CSS file, then use //deep// combinator or ::shadow pseudo elements in the CSS.
If you able to create the custom elements without using ShadowDOM then you can simply have all your less merge into a single CSS.
Honestly speaking I was unable to create a wc without shadowDOM in polymer. There is a long conversation on github on enabling / disabling and hacking a way to create a wc without shadowDOM here https://github.com/Polymer/polymer/issues/222
One solution would be to have the preprocessor translate .less files into .css and then linking them inside Polymer components, like explained in the official documentation: https://www.polymer-project.org/1.0/docs/devguide/styling#external-stylesheets
Unfortunately this is deprecated. So the other way to go could be to have another step that wraps the preprocessor-generated css files with a dom-module: this way you can follow the Polymer way including the style module inside your components, or using the css file compiled from less if you do things outside Polymer components.
I'm using Gulp for my build process and I found this module very useful:
https://github.com/MaKleSoft/gulp-style-modules
It creates, for every .less file I have in my sources, an .html file with a dom-module wrapped around it, ready to be included in the components' styles.
Related
I found MS DOC about Css in razor. But it isn't work with Scss file.
I resolve this problem by creating two files: css and scss. And use sass --watch. But I need write this every time, when creating new component.
Unfortunately SASS is not supported for CSS Isolation feature of Blazor. At least, not at this moment.
In our project, we use CSS Isolation for the CSS component isolation feature, but we use SASS files to manage our theme, for style we want accros the application.
That being said, if you really need some SASS for an unique component, you totally can, by adding for example a wrapper with a specified id, and use this id in your scss file, with a dedicated name for it, for example MyComponent.scss.
In addition, I've found this article, but I preferred to not use it because it is a bit heavy to setup, but up to you: https://joren-thijs.medium.com/how-to-add-scss-support-to-blazor-cd2a62995441
You can use AspNetCore.SassCompiler which supports both normal and isolated scss. I believe it has a watch mode when using Blazor Server, WASM is not supported yet.
It can also do minification with source mapping.
I think this should be possible, though dont know, I use tools like 'gulp' and 'webpack' to bundle asset files but is there any tool that extracts the necessary css classes, only that are being used, from the css files and pack them.
What you are looking for is called tree shaking, and usually it's already done in the build process with webpack,
You can install this plugin for css specific tree shaking or you can look for more info here about how it works with javascript (something similar happens in css)
In Gulp there is package called Uncss
https://github.com/ben-eb/gulp-uncss
and also an addon that is available for firefox
https://addons.mozilla.org/en-US/firefox/addon/dust-me-selectors/
which will help you in removed unused css
Take a look into tree shaking, there are several that are for specific css.
I'm using Codekit to minify all my CSS via Sass. This works great but causes an issue when inspecting the code as everything appears on line 1! I use the lines as a quick way to find the code I'm looking for.
I use the Codekit plugin for Coda, which means every time I make a change to a .scss file and save, it just auto compiles the code.
I guess everyone will tell me not to compile the code until launch, in an ideal world that's great but there will ALWAYS be a need to inspect the code without once it's all been compiled.
Is there a way around this? Or is this a downside of compiled code? What processes do people go through to get to the minified code? How can I tell which .scss the change is in?
I could set it to be less compressed so it's not all on one line but I would then lose the benefits of compressing it.
These are the settings I have Codekit set to:
Codekit supports Source Maps, which will let Google Chrome show you the original code even after minification.
In your compilation settings, check the Create a source map box for SASS.
For more information, check out this Team Treehouse article (the article deals with JavaScript, but the same principle applies to CSS too) and the Codekit SASS documentation.
I am trying to use LESS CSS to write my CSS. I have imported the style.less and less.js file in that order.
Now i wanna extract the CSS that LESS generates.. is there any way i can do that ? i dont want to use the script to generate it dynamically in production. just for development.
You can extract the CSS using the Firebug extension in Firefox. The compiled CSS appears under the menu choice "inline" in the CSS tab.
http://incident57.com/less/ if you're fortunate enough to use OS X, and there's a ruby gem too http://rubygems.org/gems/less although this has been superseded by the node.js implementation installed through npm. Check http://lesscss.org/ for more information.
There's also http://www.dotlesscss.org/ for windows, but not sure how useful it is.
And in 2013 we have:
http://less2css.org/
Seems to work just fine for me. Just copy/paste.
Chances are you'll want to minify your CSS after this, so:
http://cssminifier.com/
For others who'd stumble here, in modern browser you can see it in the LocalStorage. I use Chrome and it's in the dev toolbar under Resources.
In my case we also want to save the css file automatically (we have a tool that generates a template), we can do it easily with javascript.
This returns the generated CSS, just replace it with the right path, as you see it under the Resources tab:
localStorage.getItem('http://domain.com/css/main.less');
Then we send that through Ajax to save it in a css file. When switching to production we remove the less and replace it by the generated css file.
In my project i have a lot of css styles. Some of them are never used (not anymore). I check this manually with eclipse: i select text and then with "Search -> Text -> Project" i can find, if this style occurs only in the stylesheet or also in java files. Is there better way to check, which styles are currently used in my GWT project?
edit:
#Igor,Keith: thanks for the hint, but i'm not using the CssResource to insert my css file. Instead i use my index.html. And i want to remove the unused styles just for better overview. CssResource is not exactly, what i'm looking for.
If you use CssResource to inject your css file, GWT will handle pruning unused styles for you (just like it does in the case of unused code). It will also by default obfuscate it, so watch out for that. For a comprehensive explanation see the docs.
CssResource works best in combination with UiBinder. I'd recommend both - you even get cool features like compilation-time errors when you are missing a CSS style in your UiBinder xml files (or you misspelled it), among other cool/awesome things - again, check the docs for the full list.
GWT 2.0 added a feature called ClientBundle, which is a generic mechanism for bundling resource files such as images and CSS. If you bundle CSS files with ClientBundle (via the CssResource class), the GWT compiler can actually generate errors on unused CSS selectors.
The documentation is a bit rough, but here is the relevant part of the GWT docs:
http://code.google.com/webtoolkit/doc/latest/DevGuideClientBundle.html#Strict_scoping
In addition to detecting missing selectors, CssResource also supplements CSS itself, letting you use constants and conditionals within your CSS, even allowing you to specify different styles depending on which browser is being used. It also provides obfuscation and minification, among other things.
I'm still looking for a better solution. To solve the problem i've used the linux terminal instead eclipse for the search and that was faster.