Android onOrientationChange triggers before orientation completes (too early) - javascript

I need to read the pixel width of a DIV whenever the user rotates his phone. On iOS the following code will print out the DIV's width after the orientation completes. However, on Android the code will print out the DIV's width before the orientation starts.
HTML
<body>
<div id="foo" style="width: 80%">foo</div>
</body>
JS
window.onorientationchange = function() {
alert($('foo').getWidth());
}
For example, the user starts in portrait mode. He rotates to landscape mode. On Android, the code will print out the older narrower width, while iOS will print out the new wider width.
How do I make Android behave like iOS? The after width is important to me in my web application. The before width is useless to me.

a quick and dirty solution would be to use a timer. you can continue development until a more suitable solution comes up.
edit: just recognized that on android the onorientationchange event is fired before resize event, this is diffrent from ipads behaviour. check the resize event on android phones, does this provide the right width?

Related

Changing device orientation doesn't swap width and height

I'm trying to set the size of a background image to match the screen size upon window resize. The problem is that width and height don't alternate their values when I change the mobile orientation. When I test it in the dev tools of a desktop browser it works, however when testing in several mobile browsers, although the orientation does get changed, the measures don't.
This is the basic js:
$(function() {
function resizeBackground() {
$('#background-image').height(screen.height);
}
resizeBackground();
$(window).resize(resizeBackground);
});
Unfortunately due to a weird vh bug on iOS I'm forced to use JS. The issue here is that the background image jumps when the browser address bar of some browsers, specially Chrome and Firefox, gets hidden. It's detailed here: stackoverflow.com/questions/24944925/.
Summarizing my comments I want to describe why your solution doesn't work:
window.screen.height and window.screen.width get you the device's actual height and width and these values don't change on page resize or orientation change.
For the viewport sizes (you actually need viewport) the appropriate methods (variables) are window.outerWidth and window.outerHeight (in some cases window.innerWidth and window.innerHeight will work also).
For getting actual document size (html document), use document.documentElement.clientWidth and document.documentElement.clientHeight.
For detecting orientation change I would suggest orientationchange event instead of onresize event, because onresize also fires when keyboard is shown for example.
Those mobile browsers should support the more specific orientationchange event. Perhaps they're only firing that one and not resize. Try handling orientationchange too.
window.addEventListener('orientationchange', resizeBackground);
For Mobile Safari you can check window.orientation and if it is 90/-90, choose smaller of width/height for your "height". When orientation is 0, then choose higher value. I have now observed that when opening Mobile Safari directly in landscape, the values are swapped and do not swap on orientation change. As window.orientation is deprecated, it should only be used for Mobile Safari. FOr the rest, we use window.screen.orientation.angle.

Detecting pinch-zoom in firefox on android

In the other Android browsers (Chrome and the default-one) pinch-zoom fires window.resize
- Not so in Firefox : (
So how do I detect it (surely it can't be impossible) ?
Solution: I inserted a (hidden) div with width:100%.
And a function that regularly monitors this div's width.
- When the width in pixels changes, zoom has changed
(or orientation or screen size.. whatever): call myResize().
Demo: http://krydster.dk - Crossword puzzle game (danish).

Preventing viewport resize of web page when android soft keyboard is active

I'm developing a Javascript/JQuery plugin for Responsive Web Design. It has a function that monitors the viewport for changes, specifically resize and orientation. When a change is detected, a corresponding callback function is called.
However, I just noticed that on Android (specifically using the stock browser on a Google Galaxy Nexus), if the user tries to use the soft keyboard, it resizes the viewport, thus firing the callback function. This is behaviour I would like to eliminate.
Is there a way to - via Javascript - disable this behaviour or detect for it so I can make changes to the code base to accommodate it?!
The solutions I've seen so far have to do mainly with Android App Development and I'm not sure they apply in my case.
Thanks.
Ok, well after some fiddling around I've found out a solution to my problem.
So what happens when the soft keyboard is shown/hidden?! In my test, the viewport width remains constant. However, the viewport height changes size [((current - previous)/previous)*100] when the soft keyboard is shown by 43% (in portrait) and by 58%(in landscape); and when the soft keyboard is hidden by 73%(in portrait) and 139%(in landscape) respectively.
So what I did was disable the callback function when the following conditions are all true:
The device is mobile
The percentage change in viewport width is less than 1%
The percentage change in viewport height is greater than 35%
Since mobile device browsers do not have resize handles like on the desktop, I do not believe there will arise a situation where a user will mimic the above conditions in a natural way.
You can see a sample of the code here: https://github.com/obihill/restive.js/blob/f051fe6611e0d977e1c24c721e5ad5cb61b72c1c/src/restive.js#L4419. Unfortunately, it's part of a bigger codeset, but you should be able to glean the basic idea based on the conditionals.
Cheers.
I had a similar problem. And my solution was to use the orientation change event instead of the resize event which triggers when you least expect it on android :P
$(window).bind( 'orientationchange', function(e){ // Type pretty code here });
source: http://www.andreasnorman.com/dealing-androids-constant-browser-resizing/
I can share you with my pretty code. I was setting trigger on resize event and counting height relative to before resize event.
originalHeight * 100 / currentHeight give you precent wich you can change height container
You can see a sample of the code here
https://jsfiddle.net/ocg9Lus7/
UPDATE 19.11.2018
I recomend you change value from dynamic (100%, vh etc.) to static value after onload window. If you need more dynamic container you can reculclate sizes by bynding function to resize event (originalHeight * 100 / currentHeight)
You can see a sample of the code here: https://jsfiddle.net/gbmo6uLp/

Dynamically changing the viewport in iOS Safari doesn't work until the second time rotating the device

I'm developing a web for iPad/iPhone and need to set different viewports for portrait and landscape mode. I'm doing this with Javascript with the orientationchange event, but there is a problem, after loading the page when I first rotate the device, the content doesn't get scaled, but this is only the first time, if I go back to the first state and then rotate back again, this time works perfectly.
I tried the same but loading the page with the other orientation and it's the same problem, it only scales the content properly after the second try.

resize iScroll 4 to fit 100% on any device

I'm trying to resize my wrapper, so when viewed on iPhone, iPad or computer 100% of my site is in view. I have placed pictures in my scroller using the <ul> and <il> methods.
At the moment everything is in view on my computer, but on iPhone the pictures are getting cut off. It's letting me scroll horizontally and vertically my pictures, but need to resize the wrapper so my pictures are smaller.
Any help would be amazing. Cheers in advance
You didn't provide any codes, so these maybe help you:
Set proper width/height to your wrapper when browser resizes and window.onload. Because we don't know device is in landscape or portrait mode until window.onload. Here better explained how to get resized browser width/height.
Check your images width/height. Maybe images' dimensions wider than wrapper. You can set width/height to image in percent.
And don't forget refresh iScroll when browser resizes. You can do it like that:
setTimeout(function(){myScroller.refresh()}, 400); // browser need time to rotate

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