calling javascript pixel wise - javascript

i have two javascript files which are used for menus.
both of the javascripts will work differently.
one for the tabs and computers and one for the mobiles.
at a time only one working properly.
now the problems is if device width is less then 768px then mobile.js will work
and if it is more then 768px desktop.js will work.
I really don't know how to do that.
any help will be great.

Take a look at http://yepnopejs.com/ you can use it to conditionally include javascript. It's possible to hand roll this as well.

Related

how does responsive design work?

After checking a few dozen articles I am still in the dark how to actually implement a responsive ux-design (I really understood the layout part). A simple example: Bootstrap (CSS framework) collapses toolbar buttons into one drop-down button on mobiles. That's all I need! I'd like to understand just the basics of this very behavior. Does it requires only CSS, or do I need JavaScript too? I actually don't know any other way than JavaScript.
In my apps (IDEs), I usually have lots of toolbar buttons and at a certain breakpoint or width I guess I will have to put them just into a dropdown button, in one way or another, right? The obvious things such as re-arranging layout containers per break-point/width are a piece of cake with CSS; at least this is how it looks.
Update, I am working only with JS based widgets. Mostly generating all HTML.
You can make multiple (for different screen sizes) menus, dropdowns or navbars etc. And then use media queries to just display one of them at a specific screen width ( ie display: none for others). And I think Bootstrap works similarly (It might also use JS).
In this way your design will become responsive, although it will increase file size.
Check GRID. It's a (great) simple guide to responsive design.
http://adamkaplan.me/grid/
After doing lots of research and development; there is basically nothing standard out there for a JS based solution. I checked Dojo, Sencha and some others paid stuff. At the end I did end up with custom JS code. Media queries did only help to some degree, actually just when it comes to moving and sizing layout containers and pictures; but that's pretty much it. Its even better to do it in JS only since calculations become far more accurate and interfere less with your Code.
So to me 'responsive design' has actually no mean at all; its great for regular web-sites but really not for complex ux.
back to square one,
g

Stuttery performance issues with Jquery Mobile and Phonegap

So, I am developing an app using phonegap and jqm. Everything works great and it's all pretty easy thanks to phonegap build. However, I've started to see some 'stutter issues' that are really annoying. My app at the moment only has two pages and the transition effect between them is 'slide'. The first page has a background color set to it and the second one does not. Some of the issues:
When I navigate from page 1 to page 2, half of the page has the background color from the previous page. It goes away after I do some random swipes on screen.
On one of the pages, I have a regular form with some text input fields and a radio button set at the end. When I move from an input box to the radio button the keyboard slides down but it is replaced by a black area for a short period of time.
The fixed header that I have at the top randomly decides to disappear and reappear again.
These are only few of the annoying ones and these only happen on the mobile device and it works fine on the computer. So, I know it's a performance issue.
I've read up about this on the internet and here on SO and different solution have been proposed like writing custom CSS3 transitions (to take advantage of hardware acceleration) or using something like zepto.js.
What in your opinion would be the best 'cross device compatible' method to overcome these? Is there a way to force hardware acceleration with jquery mobile? Is CSS3 performance even across device platforms?
PS. I have been testing on jelly bean 4.2.2. I am not posting any of my code because they are just plain form elements and some input tags and this happens on multiple pages which are totally different so I am pretty sure this isn't code related.
Any help will be much appreciated.
JQuery writes animations using Javascript which dynamically writes inline styles that change quickly. The issue with that, is that it isn't using the hardware acceleration and if you are testing on a retina device, it animates using pixels as they are a unit of measurement. So it is skipping half of your pixels which causes the stutter.
I have written apps using PhoneGap and the best way I came up was to use CSS3 animations/transitions. Super smooth and they feel just like a native app. You will still use JQuery to add/remove classes, etc., but the movement should come from your CSS.

bad css causing really bad layout on small devices

I built a website with Foundation 4 and having some issues (lots of them) with the responsive part of it, decided to get rid of the viewports in the CSS which I thought would cause the website to render normally on small devices but the result is really bad and I'm not sure what's causing it. I have no more #media targetting small devices in the CSS and yet it still very very messed up.
You can look at the results on different devices there:
http://www.viewlike.us/
This is my website
http://broadcasted.tv/
Can anyone tell me what's wrong ? (Javascript or something ? I don't know, but it's bad...)
Is there a way to tell the browser to ignore diffferent width and handle everything the same way ?
Thanks
don't delete the #media queries, they are what is used to display things differently for each device. If you're trying to ignore different screen resolutions, you're not using responsive design.
EDIT: looking at your website, it seems to be fine for resolutions 1041+... with that knowledge, use those #media queries to get rid of that giant bar on the side.
Use a min-width for your header and divs so they don't become smaller than the desired size, I see something like that happens to your header.
For example, I just tried adding min-width:1100px; to your top-bar div, and there seems to be less of a problem in that part.
I'm not saying having a 1100px header is recommended (because it's not) but I'm just using it as an example.

How I can make mobile version of my website which will work in android , iphone,ipad?

I want to replicate a site for it's mobile version. The site have slider , simply header,footer and dropdown.
Are we able to make exact thing for mobile ( in my case I am talking about slider and drop-down made in jQuery).
What I want is make same feeling on mobile as we have for normal site. Like I see in Video example as people shown (demonstrate) for ipad,iphone that click on menu and page slide to right and something show as new page. I don't want this.
I want to choose the existing themes and color-scheme in mobile edition.
How I can do it.
for this we have something called as Responsive Web Design :)
you can have a look at here :
http://www.netmagazine.com/tutorials/build-responsive-site-week-designing-responsively-part-1
Another good place to start: http://html5boilerplate.com/
This topic is much more complicated than simply adding a few lines of code, but here's what I can offer:
If you want separate mobile and desktop (which I would suggest against) you're going to have to do some device sniffing. The easiest way would probably be to check screen size and redirect if it's under 320px or whatever size you decide on.
This will make your page load a little slower, because you're going to have to wait for the page to parse the screen size detecting script, check to see if their screen is too small, and then redirect. That's going to take a long time on a mobile device and you're not going to make any fans because of slow load time.
Responsive design is the best solution. I think you should take a step back and consider why you want your site to split into two different sites and if you are going to have the ability to constantly maintain both.
You need to use media-queries http://www.w3.org/TR/css3-mediaqueries/
with media queries u can set styles for misc devices and save mutual html...
Instead of responsive design, you can use a DDR to tailor your content to particular mobile devices: http://wurfl.sourceforge.net

Can I zoom into a web page like IE or Firefox do, using programming?

Simple - I have a layout that is 800 by 600. When I press Ctrl and +, it zooms in and looks wonderful.
I want to know if there's a CSS/Javascript way to do the same? Without the user having to do it (because users will not do it and see the small layout).
Same question was posted by someone Setting IE "Optical Zoom" feature using Javascript/CSS that got no good replies.
There is a zoom CSS property, but it is part of CSS3 and is most likely not widely supported. By setting this on the body element using JavaScript you can zoom the entire page.
I would agree with the sentiments of the answers to the question you linked to though in that it should be up to the user to choose their own zoom settings. If your site is too big/small to see, it indicates a problem with your site design.
You can set all sizes as dynamic (use em for fonts, % for divs/images sizes). Then change the main wrapper and the main font size using javascript.
You can also use CSS switching. Put all the colors and such in one css file. Then create 3 or 4 levels of zoom and inside hardcode different sizes for all the existing classes.
Example:
main.css
a{color:red;}
small.css
a{font-size:10px;}
medium.css
a{font-size:12px;}
Not all designs (in fact I'd wager, none, without targeted style sheets) can cope with the vastly different sizes of screen out there today, from portrait orientated screens at public libraries, to ultra fine artworking Macs with giant landscape screens and tiny little laptops - the latter two often used by executives that have NO understanding of how the zoom features in a browser work and also often have terrible eye sight and little patience.
My suggestion is to use relative sizing like Marcgg suggests. If you're really looking to be super flexible the you could use javascript or browserhawk (or equivalent) to measure the screen sizes and switch out style sheets for those that are really not going to work with your layout.

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