I have been using modernizr with javascript to decide whether css transitions is available, but is there a way to check if css transitions are working, without using javascript?
I think the only scenario where that would make sense is a browser without CSS animation support and with JS disabled. There you could display some message like "Please upgrade your browser or enable JS."
You could try server-side UserAgent sniffing there, but I wouldn't recommend it. First of all, it's not reliable and second it's simply not worth the effort. Anyone using such a browser is used to limited functionality.
Related
I need to determine whether a browser supports CSS' #page rule or not...
I first thought that I may be able to do this easily with CSS' #supports() rule. But my understanding now is that you cannot nest one rule in another and are only able to check the support of classic property/ value declarations.
Now I am trying to use vanilla JS to detect support:
if ('CSS' in window && CSS.supports('#page')) { ... }
However, this always returns false regardless of browser support.
Does anyone know an alternative way that I can accurately test client support for CSS' #page using vanilla JS?
TY.
What is the best way to choose the stylesheet that will be shown depending on the useragent?
Example, i want to show a css style for Android and a different one for IPhone.
Is it possible with css only?
Can i use something like media queries?
Thanks in advance
With Internet Explorer you can use conditional comments (http://msdn.microsoft.com/en-us/library/ms537512.aspx) to include stylesheets in a specific browser. This technique does not work in other browsers, and I believe it does not work in the latest version of Internet Explorer.
To my knowledge, the only way to accomplish this is with Javascript. The simplest method is to add a class to the HTML tag of the page (i.e. ".android" or ".iphone") with Javascript based on the user agent string. In the CSS simply reference .android or .iphone in your stylesheet to specifically target one or the other.
However, the best approach is to avoid doing specific browser detection whenever possible. Feature detection is the preferred approach (http://www.joezimjs.com/javascript/feature-detection-vs-browser-detection/). This is an exception as your intentions are to have a different theme based on the device.
See the isMobile Javascript library (https://github.com/kaimallea/isMobile) to easily detect an Apple or Android device. As long as the stylesheet isn't huge for each theme, I would recommend merging the Android and Apple stylesheets into one. Than use isMobile library with a little custom Javascript to add the necessary CSS class to the HTML tag.
I'm using turn.js for a page-flip effect, and it doesn't seem to work very well on IE7/IE8 (load up the website in IE7 mode and you can see for yourself).
What's the best way to support old browsers, while keeping the cool page-flip on modern browsers? (Note: I don't need the hot corners at all on IE, as I also have dedicated arrow links which flip the page via Javascript, similar to the turn.js demo.)
Do you have a sample of how you're applying turn.js? As in, do you have a link or how is your page structured? These are a good place to start.
More the the point of gracefully failing when you detect an older browser: There are multiple options, some make more sense than others depending on how much of the site is already done. First off, how does the site look with Javascript disabled completely? I know this isn't the case for IE7/8, but start there. Can it be used with no JS whatsoever? If the answer is "no," think of ways to make that answer "yes" if you can. This is always a good question when thinking about how to handle older browsers.
If you're early in the site's programming, or the content is laid out in a clear way, then you can work around the limitations of older browsers. A practice I try to follow is designing the site without JS or with as little as absolutely possible, and then program in functionality for "whizzing and banging" afterwards.
In your case, I would suggest something along the lines of: if you detect IE7/8 (or mobile browsers that may not be up to snuff, etc) then load in a secondary stylesheet with rules that give your content as much of the feel of the "original" as you can. Next, have the JS for the older browsers show/hide the pages of content instead of page-flipping them - this can be achieved with some divs on the left and right that move the page and then track the current page vs possible pages (are there any before this page? after this page?) in order to show/hide the navigation divs. turn.js just looks like fancy animations for the same thing, so you should be able to say "Hey, this browser is IE 7 or IE 8 - so, let's not initialize turn.js and just turn control over to the page previous and page next divs."
Is it possible to make a vertical, multi-level navigation bar using only CSS and WITHOUT using JavaScript?
Like the one in here:
http://www.dhtmlgoodies.com/scripts/slidedown-menu2/slidedown-menu2.html#
I am trying to avoid using JavaScript because browsers today has an option that can disable JavaScript codes. I don't want my webpages to be broken because of that settings. Should I even be thinking about this? Or should I just use JavaScript anyway?
I was hoping on using only CSS for this, though I'm not sure if CSS is enough for this.
EDIT: By the way, is there a CSS selector when you click an <a> tag? Something like 'a:click'. I only know a:hover.
You won't be able to have any sort of animation like that example, unless you use CSS3 animations, in which case you will have LESS support than if you used JavaScript.
If it were me, I would just use JavaScript to do it. If the user has it turned off, they will still receive the menu, just not the animation (if you code it correctly).
There are some examples here of what you can do with CSS:
http://www.cssmenus.co.uk/dropdown.html
CSS is mainly for styling your webpages, while JavaScript is mainly for giving them different behaviors and interactivity.
That said, CSS3 is doing a lot to change that. But, if you want a web page with any kind of Cross- browser support currently, that's not really an option.
Like you have said, users have the option of disabling JavaScript, which is a good thing for security. This, however, means that you should always try to make any JavaScript supplementary to your page, so there is still some functionality even if JavaScript is disabled.
If you want any interesting effects in your menu, you will need some mix of CSS and JavaScript, and if you define and apply your styles within your CSS documents and not from within your JavaScript, you will still sustain some level of usability
I'm learning jQuery and am about to write some pages using intensively that library. I just learned that some user disable JavaScript on their browser (I didn't even know that was possible and/or necessary).
Now, here's my question: What happens to my web application if a user disable JavaScript? For instance, I'd like to display some screens using AJAX and commands such as 'InsertBefore' to bring in live a DIV that will display the result.
So, if JavaScript is disabled, I wonder what going to happen to all this work that relies on JavaScript?
I'm kind of lost.
Thanks for helping
You may want to start by reading on Progressive Enhancement and Unobtrusive JavaScript.
I would also suggest to investigate how popular rich web applications like GMail, Google Maps and others, handle these situations.
I just learned that some user disable javascript on their browser
I do. The "NoScript" plugin for FireFox does the trick.
So, if Javascript is disabled, I wonder what going to happen to all this work that relies on Javascript?
It won't be functional.
A good practice suggests designing a site not to rely on JavaScript for major functionality. At least, accessing its content (in read-mode) should be possible. JavaScipt should only add interface enhancements like Ajax techniques etc. But the fallback version should always work.
I feel really sad when I see a site which is completely broken without JavaScript. Why can't people use CSS to put elements in proper places? Why do they try to align elements with JavaScript even if there is no dynamics involved?
The same goes for Flash sites. Once in a while a land upon a "web-design-agency" site which makes picky comments about me not allowing JavaScript. When I do I only see a basic primitive site with a few menus and that's it. What was the point of using Flash when the work is so primitive it can be done with raw HTML and CSS in an hour? For me it's a sign of unprofessional work.
All what's done in JavaScript won't work. Some users disable it for security reasons, NoScript is an excellent example. You can try it yourself by removing the scripts from your page or installing the NoScript-plugin for Firefox.
As a rule of thumb:
Make the website working with only semantic HTML
add the CSS
add the JS
But the website should be (almost) fully functional in stage 1.
If you disable Javascript in Safari things like Lexulous in Facebook won't work properly, the mouse letter carry function doesn't work.