I'm working on updating an Ionic 3 application to Ionic 4. I'm having an issue with the app css not working. I copied everything within app.scss from the original application to global.scss in the new application.
When I load up the first page of the app it looks nothing like the original application. I thought this part was more or less copy/paste but I may be wrong. One thing I experimented with was a line of css I have that looks like:
ion-input.input {
margin-bottom: 0;
border: 1px solid lightgrey;
}
and changed it to
ion-input {
margin-bottom: 0;
border: 1px solid lightgrey;
}
The new application then seems to take the border into account. Is there some major css changes needed in this conversion? or am I missing something?
Yes there are major changes. Now that Ionic 4 is based on web components the insides of them are encapsulated.
This is so they can be dropped into any page and look how the developer expects it to look, rather than being messed up by the pages styles.
The web components expose certain settings that can be styled. These are listed at the end of each documentation page. For example with ion-input:
ion-input - custom css properties - Ionic Documentation
Here is a solution for the border, and here is a solution for margin. Unfortunately the reason this has to be changed in Ionic 4 is because the Shadow DOM is now being implemented. Here is more info on that. Cheers :)
I have created a Non-Google ad banner using Google Web Designer and have used a video component to show the video. Everything works fine.
The accessibility feature, a blue border appears when the video component is clicked to play or pause the video.
I have added the following code to hide the blue border but it doesn't help.
.gwd-video-1ggs:focus, .gwd-video-1ggs:active {
outline: none !important;
box-shadow: none !important;
}
It happens only in the Chrome browser and not in Safari. Is there a potential solution to this?
Solved
I followed this post - [https://nelo.is/writing/styling-better-focus-states/][1]
Add the following code to remove the blue border.
*:focus:not(.focus-visible) {
outline: none;
}
.focus-visible {
outline-color: lightgreen;
}
The blog post explains it in details.
When using the action-sheet interface for an ion-select on Android there is inertial scrolling - a quick flick and you quickly scroll to the bottom of a long list. On iOS however, you can only scroll a few lines at a time making it tedious to scroll to the bottom of long lists.
Am I missing some parameter to enable inertial scrolling?
include this in global.scss
.action-sheet-group {
overflow: auto !important;
}
The newest version of Ionic action-sheet includes a fix for this on iOS, but it's only in Ionic4. https://github.com/ionic-team/ionic/blob/master/core/src/components/action-sheet/action-sheet.scss
To enable inertial scrolling in an Ionic3 action-sheet, you need to add:
-webkit-overflow-scrolling: touch; to the SCSS for the component.
Note: this will get overwritten if you do an npm install and overwrite Ionic src files.
In your project folder, go to:
node_modules/ionic-angular/components/action-sheet
Open action-sheet.scss and either just add that 1 line to .action-sheet-group, or change the entire .action-sheet-group to the following (to match the Ionic4 version):
.action-sheet-group {
flex-shrink: 2;
overscroll-behavior-y: contain;
overflow-y: scroll;
-webkit-overflow-scrolling: touch;
pointer-events: all;
background: var(--background);
}
I want to create a section with a background covering it in a mobile web page, so I was using the following CSS code:
#section1{
background: url("background1.png") auto 749px;
height: 749px;
}
The background is showing correctly on Android (Chrome, Firefox ...), but it is not showing at all on iPhone or iPad (Safari, Chrome iOS ...). I have tried to set these properties using jQuery when the DOM is ready, but no luck. I read that the size might be a problem, but the image is about 700kB (1124x749px) so it should accomplish the Safari Web Content Guide rules. Which is the problem?
My problem was that iOS doesn't support background-attachment: fixed. Removing that line made the image appear.
It looks like there are workarounds for a fixed background image though: How to replicate background-attachment fixed on iOS
There's a problem with your CSS rule:
Your using the shorthand notation in which the background-size-property comes after the background-position-property and it must be separated by a /.
What you're trying to do is to set the position, but it will fail as auto is not a valid value for it.
To get it to work in shorthand notation it has to look like this:
background: url([URL]) 0 0 / auto 749px;
Also note that there's a value called cover, which may be suitable and more flexible here:
background: url([URL]) 0 0 / cover;
The support for background-size in the shorthand notation is also not very broad, as it's supported in Firefox 18+, Chrome 21+, IE9+ and Opera. It is not supported in Safari at all. Regarding this, I would suggest to always use:
background: url("background1.png");
background-size: auto 749px; /* or cover */
Here are a few examples and a demo, to demonstrate that behavior. You'll see that Firefox for example shows every image except the fist one. Safari on the other hand shows only the last.
CSS
section {
width: 200px;
height: 100px;
border: 1px solid grey;
}
#section1 {
background: url(http://placehold.it/350x150) auto 100px;
}
#section2 {
background: url(http://placehold.it/350x150) 0 0 / auto 100px;
}
#section3 {
background: url(http://placehold.it/350x150) 0 0 / cover;
}
#section4 {
background: url(http://placehold.it/350x150) 0 0;
background-size: cover;
}
Demo
Try before buy
Further reading
MDN CSS reference "background"
MDN CSS reference "background-size"
<'background-size'>
See background-size.
This property must be specified after background-position, separated with the '/' character.
I hope this will help someone in despair.
In my case, it was the size of the image that was too big, so the iPad just wasn't loading it (and it was right actually).
Diminishing its size and quality solved the loading issue.
The problem was not solved when I tried to use properly the background in shorthand. It works when I split the background property:
#section1{
background: url("background1.png");
background-size: auto 749px;
height: 749px;
}
Reduce the image size if nothing else works -- iOS doesn't like large image sizes on mobile and simply won't display the image if it's too large.
Great fundamentals by #insertusernamehere! No matter what I did I couldn't get my image to show up...until, I went back to basics. The image size was too large and iPhone didn't like loading an image of that size, over 700kbs. So, I reduced it to 32kb and we were in action.
Background image disappears on the IOS Browser (iPhone/iPad).
This is the code i used:
/*CSS*/
.bg-image {
background: url([URL]) center/cover no-repeat;
}
Alternatively, img src works on all browsers. It adds the Background Images acc to devices resolution.
<div class="download">
<picture>
<source srcset="/images/ios-device-mobile-v2.png" media="(max-width:450px)"/>
<source srcset="/images/ios-device-mobile-v2.png" media="(min-width: 600px)"/>
<img src="/images/ios-device.png" class="imgright">
</picture>
</div>
This piece of code is tested on iPhone Safari, Android Chrome and web Safari. Hopefully, This will help.
background-attachment: fixed; is not supported by IOS.
You can fix this by keeping the image in the div and positioning the div.
Hope this will work.
I had an negative text-indent that was throwing my background image off the page, so color:Transparent it is then.
I didn't see anyone specifically say this, but you have to define the width too. Makes since, since I set the background size to "contain" - it has to know what the container's dimensions are.
Once I did, the background rendered as expected.
#media only screen and (max-width:599px) {
[id=banner] td { width:480px !important; height:223px !important; background:url('image') no-repeat 0 0 !important; }
}
#media only screen and (max-width:479px) {
[id=banner] td { width:320px !important; height:149px !important; background:url('image') no-repeat 0 0 !important; background-size:contain !important; }
}
Note: The background URL needs to be defined for both breakpoints so that it works for iPhone 5 (iOS7).
Add a background-color solved my problem
background-color: #F4F4F2;
I had to set input { opacity: 0; } for my input + span {} icon to show up.
I don't have a real solution/reason for my similar issue but my background-image PNG image simply wouldn't show up until I moved it to a new folder in my (Cordova) iPad app. I literally moved it from /css/images/sweden/myimage.png to /css/images/sv/myimage.png and it started working. The other odd thing is that ALL other images in the original folder work fine (as background-image). Super strange. If I find the true reason/fix I'll report back.
I tried resizing my background image, made it way too small to test the theory, but it still wouldn’t show on any browser on the iPad (and presumably an iPhone). Tried other solutions that are listed here – still no good. Then I noticed that the element had inherited display: table;. Added display: block; to override that and the background image now displays on all divices that I've tested it on.
It's an old issue, i would like to share my solution here. iOS bigger image than the dimension ignores rendering, please use appropriate use size, not the css height/width. The actual image should not be more than 150% larger in size than the rendering viewpoint.
The iPhone is admittedly not the best platform for viewing code, but I'd like to optimize the mobile portion of my web site for the device as best I can. I'm having trouble getting code (Java code, in this case) to display properly.
I'm using <pre> tags, along with some CSS to render a nice little background for the code. This looks OK:
However if you scroll to see the rest of the code, you get this:
The text inside the <pre> is rendered properly, but the background color stops at the width of the device. I have tried this in the simulator, in a 3G device running 3.0, as well as in a 3G running 3.1-beta and they all behave this way.
It does render fine in Safari on the Mac; just not on the iPhone.
Here is the HTML:
<pre>
String input = readUserInput(); // assume defined elsewhere
int i;
try {
i = Integer.parseInt(input);
} catch (NumberFormatException exception) {
System.err.println("You entered an invalid integer: " + exception.getMessage());
}
</pre>
And the CSS:
pre {
font-weight: bold;
border: 2px solid green;
background: #669999;
padding: 5px;
}
What a curious bug! I'm able to reproduce it on a real live iPhone. I'm guessing it's caused by something about how iPhone processes the viewport settings. One thing you should clarify is what viewport setting you have in your page (via a meta tag). Your screenshot suggests it's something smaller than the default 980 pixel size. I tried tinkering with the viewport in various ways but couldn't stop this bug from occurring.
I have one workaround, which is to set a width parameter on the pre block. Ie:
<pre style="width: 50em;">
This is a bad solution for several reasons; it makes a fixed width block, it screws up your border, etc. But it does result in a coloured background block that's wider than the viewport. Maybe it's acceptable to you or maybe it's the basis of a real solution.
Have you tried setting a width or min-width for your pre block? Or perhaps trying a different position or display attribute for the block. Could try floating it or display: table. Just some ideas.
I'm not sure if pre accepts the overflow attribute but I'd try setting that, if not, wrap it in a div and do the background there, will give you slightly more freedom in your formatting options. (for instance if you wanted to have several blocks of code with "captions" underneath each part)