How can I add separate CSS for one page in Angular?
This is the CSS I need, as per How to remove the URL from the printing page?:
#media print{
#page{
margin:0;
}
body{
margin:30px;
}
}
But putting CSS into the component with ::ng-deep or ViewEncapsulation.None won't help here, because when navigating away from a page, the CSS of the page isn't deleted.
I've added a Stackblitz, which explains the problem clearly.
I've come up with a potential solution, but it doesn't work:
encapsulation: ViewEncapsulation.None
...
constructor(private renderer: Renderer2) {
this.renderer.addClass(document.body, 'special-print');
}
ngOnDestroy() {
this.renderer.removeClass(document.body, 'special-print');
}
....
....
....
#media print{
#page{
margin:0;
}
body.special-print{
margin:30px;
}
}
Why it doesn't work:
While it would help with <body> CSS, it won't help with #page CSS. Perhaps the question would be better summarized as "How to add global CSS, but remove it when we leave the page?".
Solved!
We print the <style> block directly into the component's HTML, and therefore when the component gets removed, our <style> block gets removed too. (Normally this wouldn't work, but thanks to DomSanitizer.bypassSecurityTrustHtml, Angular won't break our code when running optimizations.)
Here's a StackBlitz.
First, create a new component to handle the work:
component.ts: (This is all we need. We don't need an HTML or style.css file.)
//Inside your local component, place this HTML
//<app-local-css [style]="'body{background:green !important;}'"></app-local-css>
// OR
//<app-local-css [scriptURL]="'/path/to/file.css'"></app-local-css>
#Component({
selector: "app-local-css",
template: '<span style="display:none" [innerHTML]="this.safeString"></span>'
})
export class LocalCSSComponent implements OnInit {
constructor(protected sanitizer: DomSanitizer) {}
#Input() scriptURL?: string;
#Input() style?: string;
safeString: SafeHtml;
ngOnInit() {
if (this.scriptURL) {
let string = '<link rel="stylesheet" type="text/css" href="' + this.scriptURL + '">';
this.safeString = this.sanitizer.bypassSecurityTrustHtml(string);
} else if (this.style) {
let string = '<style type="text/css">' + this.style + "</style>";
this.safeString = this.sanitizer.bypassSecurityTrustHtml(string);
}
}
}
And then use it like this:
mySample.component.html:
<app-local-css [style]="'body{background:green !important;}'"></app-local-css>
// OR
<app-local-css [scriptURL]="'/path/to/file.css'"></app-local-css>
Angular is doing client-side rendering, which is bad news, because you do not have separate pages. You have several possible solutions though:
1. Separate page
You can create another page with or without Angular, which includes the CSS you need and load that page. In the most simplistic approach to achieve this, the other page would have a different URL. If having a different URL is not to your liking, then you could hide your page's content and show the other page inside an iframe. It would admittedly be a hacky solution, but it is a solution.
2. Client-side CSS rendering
Instead of just loading the CSS, you could have a component which would control global CSS rules, matched by your view's name. You would have a template value rendered to a property, like:
#media print{
#page{
margin:0;
}
body{
margin:30px;
}
}
And when you visit the page where this needs to be activated, you would simply initialize a property with a style HTML element that was generated based on the template and added to head. Once you leave the given view, your component would detect that event and would remove() that element. If you choose this solution, then it would be wise to make sure that you are supporting this on more general terms, so that if some new views will have their custom global CSS, then they would be easy to integrate into your project in the future.
3. body classes
You could add/remove some custom-print or whatever class to/from body whenever the style is to be changed. This way you could add the CSS exactly once to your HTML and change the rules accordingly, like:
body.custom-print {
margin: 30px;
}
This would be a neat solution, but the problem in your case is that you have a #page rule as well and I'm not sure how you could make that dependant on body classes or some other HTML attributes. I would conduct quite a few experiments about this if I were you.
4. Iframe staging
You could avoid having that CSS in your main page, but would have a hidden iframe where you would have the CSS and would just copy the content into the CSS and once that's loaded, print that.
Don't change the whole body from apple. Instead, there are a few changes to make.
In the app component, hold a boolean for whether or not you are on apple, and use ngClass for class defined in scss.
Track which route you are on in appComponent, and set isApple accordingly
Add a div around all your html, for container to take full size
Add global html, body setting height to 100% so you see color everywhere
Remove body overriding in apple
so,
appComponent.ts:
isApple: Boolean;
constructor(router: Router) {
router.events.subscribe(v => {
if (v instanceof NavigationEnd) {
this.isApple = v.url === "/apple";
}
});
}
appComponent.html:
<div [ngClass]="{'red':isApple}" class="container">
<p>
There are two components: Apple and Banana. Switching between them will show
the problem.
</p>
<router-outlet></router-outlet>
</div>
appComponent.scss
.red {
background-color: red;
}
.container {
height: 100%;
}
apple.component.scss (remove body)
/*Sample "global" CSS, that affects something outside the current component.*/
::ng-deep {
#media print {
#page {
margin: 0;
}
}
}
styles.scss (global)
html, body {
height: 100%;
}
You can see this altogether at this Stackblitz link
You can add different css files in the component (for instance, app-task.component.ts):
#Component({
selector: 'app-task',
templateUrl: './app-task.component.html',
styleUrls: ['./app-task.component.scss', './styles2.scss', './styles3.scss']
})
In this example, the style files are in the same folder that the component, but this is not the best option: you have to put the files in assets, for example. Also, be careful with the thread of the styles, since the first one you put will be put before the second (obviously).
I have tried to search but am not sure if I am posing the question right.
I applied the following css to my site:
a[target='_blank']::after {
content: '\29C9';
}
This means that all external links will get the icon attached to it. So far, so good, it works as expected.
There are some situations though where I do not want this to happen, like in social share buttons. How can I exclude some classes?
Like when the link appears in a div with class 'socialbutton'?
PS I cannot add other style to these buttons (WordPress website and generated code)
You can overwrite this css code by adding new css to the class.
Example you can overcome this:
a[target='_blank']::after {
content: '\29C9';
}
By doing this:
.socialbutton::after {
content: '\fff' !important;
}
You can use the :not() selector:
a[target='_blank']:not(.social)::after {
content: '\29C9';
}
How do I access the last div (div.access-example) in this line of code?
<div id="footer-example" class="full-example">
<div id="footer-example2" class="fixed-example">
<div class="almost-there">
<div class="access-example">
I tried it like this:
div#footer-example div#footer-example2 div.almost-there div.access-example
{ code goes here; }
When that didn't work, I added { code goes here !important;} in case something was overriding it. I also tried with children (>).
Note: I can't use div.access-example and add my code because the same div is being used elsewhere, and I need to change it only in that particular place; and because it's a Wordpress site and I don't have access to the Ftp, I need to access nested divs.
This works..
#footer-example #footer-example2 .almost-there .access-example {
color:red;
}
This also works
#footer-example .fixed-example .almost-there .access-example {
color:red;
}
Make sure this (your) CSS declaration is not being overridden using Chrome Dev Tools or something similar.
div div div .access-example
{
background-color:yellow;
}
or
#footer-example #footer-example2 .almost-there .access-example
{
background-color:yellow;
}
You can vary by removing one of the class or id in the 2nd.
If you just need to call the .access-example class, you can do this:
.access-example{}
If you need to have the hierarchy, this works too:
.full-example > .fixed-example > .almost-there > .access-example{}
I'd like to know if there's a way to apply the same styles to IDs that start with the same workds.
For example, I have #youtube_gallery_item_1, #youtube_gallery_item_2,....and the number keeps increasing, so I can't add a new ID every time I add a new item. FYI, I'm working with Wordpress and YouTube SiimpleGallery plugin.
I'd appreciate your help!
The "starts with" selector in CSS3.
div[id^=youtube_gallery_item] {
}
Note that this doesn't work in IE8 and below.
What would be a better idea would be to assign all of your #youtube_gallery_items a class, and then assign styles to that class. I'm sure that the plugin that you're using is doing this. Look at the source code, and if you see that they all have the same class, use:
.name-of-the-class {
}
You can use an attribute selector:
[id^="youtube_gallery_item"] {
color: skyblue;
}
http://jsfiddle.net/p9Ya8/
I would suggest adding a class
.youtube_gallery_item {
background: ;
width: ;
...
}
Its compatible with all browsers and is the easiest way to get around.
<div id="youtube_gallery_item_1" class="youtube_gallery_item"></div>
<div id="youtube_gallery_item_2" class="youtube_gallery_item"></div>
<div id="youtube_gallery_item_3" class="youtube_gallery_item"></div>
In the HTML code there is a div like:
<div id="xxx.yyy">...</div>
I want to specify the style in a css file. How can I get a reference to this div? The following does not seem to work:
#xxx.yyy {
}
Thanks
#xxx\.yyy {
}
Should do the trick. No harm done in using dots in CSS id names
You could also do something like this...
div[id="xxx.yyy"] {
/* your styles here */
}
The spec says it all: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
jsFiddle: http://jsfiddle.net/UnsungHero97/mjGzQ/