Angular.js data-bind background images using media queries - javascript

I have an Angular.js application with dynamically background images (should have data-binding for their URL). I also want to use css media queries in order to detect orientation/pixel density etc.
The only solution I found is using javascript to add URL to the background image, something like this:
myDiv.css({'background' : 'url('+ scope.objectData.poster +') no-repeat', 'background-size':'auto 100%'});
This way I have to pass all media queries logic to javascript, something like this. (My intention is to be able to serve different background image for each screen resolution / pixel density / orientation)
I am looking for a cleaner solution to use css media queries and still be able to data-bind my image sources.
tnx!
Yaniv

This is just a starting point solving your problem.
You may use matchMedia: https://developer.mozilla.org/en-US/docs/Web/API/Window.matchMedia
if (window.matchMedia("(min-width: 400px)").matches) {
$scope.poster = 'small.png';
} else {
$scope.poster = 'big.png';
}
now you can use it in the html file:
<div class="moments-preview-image"
ng-style="{'background-image': 'url('+poster+ ')'}"> ... </div>
If your browser doesn't support this new API you may have a look on some interesting workarounds:
http://wicky.nillia.ms/enquire.js/
http://davidwalsh.name/device-state-detection-css-media-queries-javascript

Related

Inverted a Responsive Size for an Image

I'm attempting to use the following design on a responsive website. I'm curious if there's a way to set up some sort of inverse resizing method through jQuery / Javascript because as the viewport gets smaller, the copy will respond and get larger.
I've tried using jQuery to modify the image size, but I only know enough to manually resize it at different breakpoints
Here's my attempt at a solution:
var viewportWidth = $(window).width();
if (viewportWidth <= 768) {
$("#curlybrace").css("width", "80px");
}
Is there a way to set up a dynamic scaling image?
Try looking into CSS and media queries, seems like it would be a neater solution than trying to do this with JS.
You would use something like this:
function resizeFn() {
var width = window.width();
// ...
}
$(function() {
$(window).resize(resizeFn).trigger('resize');
});
Not possible to do an inverse with CSS, I don't think (I thought maybe through calc(), but I don't think it lets you do unit manipulations like that).
Fair warning, this doesn't sound like a good design unless you're trying to make it look nuts.

Create grid of image

Here I have to implement a webpage
which has a grid that display images. It will be easy if all the images have the ideal width and height, so I can arrange these images to fit the grid. However, with images of various sizes, I hasn't found solution yet. So, anyone has any idea or know some library/tool that can
flexibly create the image grid like that ?
Thankyou !
I reckon this is what you are looking for: http://masonry.desandro.com/ . JS library that allows to do exactly what you want.
If you're using jQuery I would recommend using Masonry, it's also built into core wordpress if you're using that too.
Here's an example of using it.
function masonry_shiz(){
$('#gal1').masonry({
singleMode: true,
"gutter": 0,
isFitWidth: true,
isAnimated: true
}).imagesLoaded(function() {
$('#gal1').masonry('reloadItems');
});
$(window).load(function() {
$(".masonry-brick").each(function(i) {
$(this).delay((i + 1) * 50).fadeIn();
});
});
}masonry_shiz
Here's a link to the plugin
Try using jQuery plugin called Freewall. It is available at http://vnjs.net/www/project/freewall/
Check this demo for the same plugin (same as your requirement):
http://vnjs.net/www/project/freewall/example/image-layout.html
check out these links:
stackoverflow-question
jquery-plugin
another-alternative
and this article here.Hope it helps
If your design is not supposed to change, you can use a CSS framework to build such a page.
A famous one is Bootstrap, which allows you to order <div> tags in a grid, using rows and columns. This is responsive as well, meaning the result is auto-adapted to large screens as well as phones and tablets.
You can use other frameworks such as elasticss, Knacss, Blueprint.

Activating a jquery function only in desktop mode?

I have a jquery funciton which sticks the navbar to the top of the webpage, but I only want this feature in desktop and tablet mode (not in phone mode). How do I de-activate this function?
$(document).scroll(function(){
var elem = $('.navbar');
if (!elem.attr('data-top')) {
if (elem.hasClass('navbar-fixed-top'))
return;
var offset = elem.offset()
elem.attr('data-top', offset.top);
}
if (elem.attr('data-top') <= $(this).scrollTop() )
elem.addClass('navbar-fixed-top');
else
elem.removeClass('navbar-fixed-top');
});
Use CSS media queries to manipulate the nav bar. Browser/OS detection shouldn't factor into styling, just resolution and media type.
What is the syntax for a CSS media query that applies to more than one property (AND operator)?
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries
Based on your question, it seems like the real concern here is saving screen real estate on a mobile device. So as most of the other users have pointed out, you can rely on using media queries here instead. In order to make sure the listener isn't even attached in case of small screens, you can use Modernizr.mq to test a media query and use the returned value:
if( Modernizr.mq('only screen and (min-height: 640px)') ) {
// Case specific code here, only executed if screen height is > 640px
}
This is assuming you're willing to add Modernizr or are already using it. If you don't have it already included and only plan on using this single test, you can download a custom build(2kB) from modernizr.com which only includes the media query test.
Check this out -- It maybe what you're looking for they're Open source mobile phone detection
http://detectmobilebrowsers.com/

Moving content blocks using javascript for responsive design

I'm working on a highly responsive website at the moment and I hit 2 areas where certain blocks of content need to move to others areas of the site. It would not be possible to do so purely with CSS. I suppose I could relatively reposition the blocks but as the dimensions change this isn;t really possible.
The option I am thinking of is, when a media query gets triggered, to then pull a block out of the page and append it in elsewhere where I need it.
I realise this is not ideal bit what I am wanting to ask is if this is a reasonable thing to so.
I know some of you may say reorder some of the markup but that is not possible. As stated above, I know falling back to javascript is not ideal but it would suit this and I don't particularly wish to duplicate content just so I can avoid the use of javascript.
Flexbox would be perfect but support is not where I want it to be currently for me to use that.
What do people here think? Any other solutions?
The right way is to listen to media queries using MediaQueryList:
var mql = window.matchMedia("(max-width: 320px)");
mql.addListener(function(event) {
if(event.matches) {
// Window width is less than or equal to 320, do something cool.
} else {
// Window width is more than 320, do something else.
}
});
The events will trigger when the query is either met or 'unmet'.
Alternatively, you can listen to a resize event, but note your function will get triggered for every new dimension. (Assuming jQuery in the code below.)
$(window).resize(function() {
if($(window).width() <= 320) {
// Window width is less than or equal to 320, do something cool.
} else {
// Window width is more than 320, do something else.
}
});
Like you said yourself though, using JS to make your layout responsive is generally NOT advisable. You can never assume all your users have JS enabled and all goes well.
I would rather see you solve this by restructuring your HTML and CSS. If the content layout has to change a lot, try outputting a block of content in two different places in your HTML and toggling visibility with CSS media queries (setting one to display:none; and the other to display:block;). You should be able to solve most responsive layout issues by rethinking your website structure.
Others looking for a solution may be interested in the Bootstrap Toolkit JS library available here: https://github.com/maciej-gurban/responsive-bootstrap-toolkit
Responsive Bootstrap Toolkit provides an easy way of breakpoint
detection in JavaScript, detecting changes in currently active
breakpoint, as well as executing any breakpoint-specific JavaScript
code.
The SASS module enables quick and simple styling for elements needing
different property values for each screen resolution.
Then you can do things like:
(function($, document, window, viewport){
// Listen to resize event
$(window).bind('resize', function() {
// Default 300ms poll delay
viewport.changed(function() {
// Debug
console.log( 'Current breakpoint: '+ viewport.current() );
// Trigger custom event
$('body').trigger('viewportChanged', [viewport.current()]);
}, 300)
});
// Register event listener
$(document).on('viewportChanged', 'body', function(event, current) {
console.log('Current breakpoint: '+ current);
}
})(jQuery, document, window, ResponsiveBootstrapToolkit);
You could check out some of the already available responsive design HTML boilerplates like Twitter Bootstrap or Zurb Foundation. Maybe their existing configurations satisfy your need.
I have a similar problem on two websites and i do:
JavaScript/jQuery with the window re size event and have breakpoints in JavaScript to. I then remove the item and append/prepend it where i want it to be.
On my other website i use Twitter Bootstrap which is very responsive and looks nice.
I would personally go with Twitter Bootstrap as its a nice grid system. If your site is very complex and cant be done using Twitter Bootstrap them capturing the window re size event is the best way.
$(window).resize(function() {
//Use $(window).width() and maybe some ifs/a switch to handle break points
if($(window).width()<700){
//Move it here
}
});
With CSS and JS it can be done :) You can clone the content to another section with jquery (append), then using media queries you can control what shows.
Here is what I do:
I do the appendTo:
$( $('.goto').html() ).appendTo('.mobile')
Here's an example I did:
http://jsfiddle.net/Riskbreaker/vkfWd/
This might not be what you are looking for (since its really not moving it but cloning the content )but this is the way I do it.

How can I resize a swf during runtime to have the browser create html scrollbars?

I have a swf with loads text into a Sprite that resizes based on the content put into - I'd like though for the ones that are longer than the page to have the browser use its native scroll bars rather than handle it in actionscript (very much like http://www.nike.com/nikeskateboarding/v3/...)
I did have a look at the stuff nike did but just wasn't able to pull it off. Any idea's?
The trick is to use some simple JavaScript to resize the Flash DOM node:
function resizeFlash( h ) {
// "flash-node-id" is the ID of the embedded Flash movie
document.getElementById("flash-node-id").style.height = h + "px";
}
Which you call from within the Flash movie like this:
ExternalInterface.call("resizeFlash", 400);
You don't actually need to have the JavaScript code externally, you can do it all from Flash if you want to:
ExternalInterface.call(
"function( id, h ) { document.getElementById(id).style.height = h + 'px'; }",
ExternalInterface.objectID,
400
);
The anonymous function is just to be able to pass in the ID and height as parameters instead of concatenating them into the JavaScript string.
I think that the JavaScript is fairly cross-platform. If you want to see a live example look at this site: talkoftheweather.com. It may not look as though it does anything, but it automatically resizes the Flash movie size to accommodate all the news items (it does this just after loading the news, which is done so quickly that you don't notice it happening). The resize forces the browser to show a vertical scroll bar.
I've never done it that way around but I think swffit might be able to pull it off.
I halfway looked at swffit but the height (and width sometimes but mainly height) would be dynamic - swffit let's you declare a maxHeight but that number would be constantly changing...maybe I could figure out how to set it dynamically. A great place for me to start though - thanks!
What I've mostly been using if for is to limit how small you can make a "fullbrowser" flash, and for that it works great.
Happy hacking!
(and don't forget to post your findings here, I might need that too soon ;))
SWFSize
See here for more details.
Intuitsolutions.ca

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