Question is not clear but I'll break it down. In angular we can write isolated css for styling. It works pretty well for native html elements. But unlike react, angular wrap our html with custom elements like <app-card>...</app-card>. When I write css for those wrapper elements, it doesn't work .
If I have a post list like
<div class="post-list">
<app-card [post]="post" *ngFor="let post of posts"></app-card>
</div>
If I write css to apply some vertical gap between app-card components in PostListComponent. Well nothing happens.
.post-list app-card:not(:last-child) {
margin-bottom: 2rem;
}
How can I make it work? Or with angular logic, how can I apply vertical gap between angular components
Just add display: block; on your app-card component & it will work as expected.
.post-list app-card {
display: block;
}
.post-list app-card:not(:last-child) {
margin-bottom: 2rem;
}
<div class="post-list">
<app-card>Card 1</app-card>
<app-card>Card 2</app-card>
<app-card>Card 3</app-card>
</div>
You can define encapsulation: ViewEncapsulation.None in your Component like this:
#Component({
selector: 'foo',
template: './foo.component.html',
styleUrls: ['./foo.component.scss'],
encapsulation: ViewEncapsulation.None
})
export class FooComponent { }
Which will treat your .css as the same if you were putting it in the global scope.
To be more accurate, it won't append .fooComponent to each css rule in foo.component.scss.
You can make the iteration in div tag then add your class
<div class="post-list">
<div class="post" *ngFor="let post of posts">
<app-card [post]="post"></app-card>
</div>
</div>
And in your css
.post-list .post:not(:last-child) {
margin-bottom: 2rem;
}
There is no reason it shouldn't work. Just tried to put in some of your code here. https://stackblitz.com/edit/angular-scss-demo-icqrye
app.component.html
<div class="post-list">
<app-new *ngFor="let item of [1,2,3,4]"></app-new>
</div>
styles.scss
.post-list app-new:not(:last-child) p {
margin-top: 2rem;
color: green;
}
And it works perfectly. Are you looking for something else?
And if you want to add the style (margins) to the component directly, you will first need to set the display of the component to block/flex as per requirement.
.post-list app-new:not(:last-child) {
display: flex;
}
Related
With reference to this plunker:
https://plnkr.co/edit/GWsbdDWVvBYNMqyxzlLY?p=preview
I have the same css specified in the styles.css file, and in the src/app.ts file.
If I comment in the css in styles.css and comment out the css in src/app.ts, it works.
styles.css:
/* If these are commented in, and the ones in src/app.ts are
* commented out, the three items are spaced appropriately. */
/***
md-toolbar-row {
justify-content: space-between;
}
md-toolbar {
justify-content: space-between;
}
***/
If I comment out the css in styles.css and comment in the css in src/app.ts, it fails.
src/app.ts:
#Component({
selector: 'my-app',
template: `
<div>
<h2>Hello {{name}}</h2>
<md-toolbar color="primary">
<span><md-icon>mood</md-icon></span>
<span>Yay, Material in Angular 2!</span>
<button md-icon-button>
<md-icon>more_vert</md-icon>
</button>
</md-toolbar>
</div>
`,
// If these are commented in, and the ones in style.css are
// commented out, the three items are scrunched together.
/***/
styles: [
`md-toolbar-row {
justify-content: space-between;
}`,
`md-toolbar {
justify-content: space-between;
}`
]
/***/
})
export class App {
name:string;
constructor() {
this.name = `Angular! v${VERSION.full}`
}
}
I'm having trouble visualizing the difference between defining the css for the whole application, and for the specific component. Can someone tell me what's going on?
=================================
#bryan60 and #Steveland83 seem to indicate that the problem lies somewhere in the view encapsulation. And upon further investigation, it does in a sense.
If you look at the code below, you will see that the styles for md-toolbar and md-toolbar-row have an attribute attached. But the html for md-toolbar and md-toolbar-row does not match. Only md-toolbar has the attribute attached. md-toolbar-row doesn't. I have marked the relevant four lines with >>>>>.
So that's the problem but:
1. Do I report it to the material design people as an error?
2. Is there some workaround I can use today?
<html>
<head>
:
<script src="config.js"></script>
<script>
System.import('app')
.catch(console.error.bind(console));
</script>
<link href="https://rawgit.com/angular/material2-builds/master/prebuilt-themes/indigo-pink.css" rel="stylesheet">
<style>
>>>>> md-toolbar-row[_ngcontent-c0] {
justify-content: space-between;
}
</style>
<style>
>>>>> md-toolbar[_ngcontent-c0] {
justify-content: space-between;
}
</style>
<style>
.mat-toolbar {
display: flex;
: :
.mat-mini-fab,
.mat-raised-button {
outline: solid 1px
}
}
</style>
</head>
<body class="mat-app-background">
<my-app _nghost-c0="" ng-version="4.4.0-RC.0">
<div _ngcontent-c0="">
<h2 _ngcontent-c0="">Hello Angular! v4.4.0-RC.0</h2>
>>>>> <md-toolbar _ngcontent-c0="" class="mat-toolbar mat-primary" color="primary" role="toolbar" ng-reflect-color="primary">
<div class="mat-toolbar-layout">
>>>>> <md-toolbar-row class="mat-toolbar-row">
<span _ngcontent-c0=""><md-icon _ngcontent-c0="" class="mat-icon material-icons" role="img" aria-hidden="true">mood</md-icon></span>
<span _ngcontent-c0="">Yay, Material in Angular 2!</span>
<button _ngcontent-c0="" class="mat-icon-button" md-icon-button=""><span class="mat-button-wrapper">
<md-icon _ngcontent-c0="" class="mat-icon material-icons" role="img" aria-hidden="true">more_vert</md-icon>
</span>
<div class="mat-button-ripple mat-ripple mat-button-ripple-round" md-ripple="" ng-reflect-trigger="[object HTMLButtonElement]" ng-reflect-centered="true" ng-reflect-disabled="false"></div>
<div class="mat-button-focus-overlay"></div>
</button>
</md-toolbar-row>
</div>
</md-toolbar>
</div>
</my-app>
</body>
</html>
One of the Angular features is View Encapsulation which basically means that you can define styles scoped only to a specific component without affecting any other components.
By default styles are scoped only for the component they are referenced in, but you can choose to override that to make them available globally by setting your components encapsulation to None.
E.g.
import { Component, ViewEncapsulation } from '#angular/core';
#Component({
selector: 'component-that-shares-styles',
templateUrl: './component-that-shares-styles.component.html',
styleUrls: ['./component-that-shares-styles.component.scss'],
encapsulation: ViewEncapsulation.None // <-- Set encapsulation here
})
*Note that you will need to import ViewEncapsulation from #angular/core
Okay, with help from #Steveland83 and #bryon60, I came to a definite answer. The Material Design people are aware of this problem. They have made a writeup.
https://github.com/angular/material2/blob/master/guides/customizing-component-styles.md
Here's their summary:
Styling other components
If your component has view encapsulation turned on (default), your component styles will only
affect the top level children in your template. HTML elements belonging to child components cannot
be targeted by your component styles unless you do one of the following:
Add the overriding style to you global stylesheet. Scope the selectors so that it only affects
the specific elements you need it to.
Turn view encapsulation off on your component. If you do this, be sure to scope your styles
appropriately, or else you may end up incidentally targeting other components elswhere in your
application.
Use a deprecated shadow-piercing descendant combinator to force styles to apply to all the child
elements. Read more about this deprecated solution in the
Angular documentation.
I don't want to use global css, or a deprecated solution. I guess I will style with classes, and not elements. If someone has a better idea, tell me!
I tried to include css for children element included in a component via ng-content. It seems to be not implemented yet in Angular 2 or maybe someone has got a solution except to put css in a general stylesheet ?
app.component.ts
<comp-parent>
<comp-child></comp-child>
</comp-parent>
compParent.component.html
<div class="wrapper">
<ng-content></ng-content>
</div>
compParent.component.css
.wrapper > comp-child {
margin-right: 5px; <-- Not applied !!!
}
You can use /deep/ (deprecated) or >>> or ::ng-deep selector:
https://angular.io/guide/component-styles#deprecated-deep--and-ng-deep
E.g.:
.wrapper ::ng-deep comp-child { ... }
Note that >>> seems to not work for projects based on angular-cli.
Apply classes to the html which is going to be rendered.
app.component.ts
<comp-parent>
<comp-child></comp-child>
</comp-parent>
#Component({
selector: 'comp-parent',
template: `
<div class="wrapper">
<ng-content></ng-content>
</div>
`
})
export class CompParent { }
#Component({
selector: 'comp-child',
template: `
<div class="comp-child">
<div>
</div>
</div> `,
})
export class CompChild {}
/// In styles.css
.wrapper .comp-child {
margin-left: 50px;
}
This worked for me in my project.
How can I use component variables within style TAG in Angular 2?
I do have an Angular 2 component for my header which I like to color depending on a users setting. Thus I'd like to assign an background and font color. While I know how to to this with an attribute binding to an element, I couldn't figure out how to use in a style tag.
Using attribute binding for style works well, however this gets pretty anoying for several subelements, especially if they are nested within other sub components. [ngStyle]= attribute is also only working on a single element.
<header id="header" [style.background-color]="changeBackground()">
<div>
Some Text
Some Link
<subcomponent></subcomponent>
</div>
<div> ... a lot mor stuff </div>
</header>
Thus I'd like to add something like
<style>
#header, #header a {
color: {{mycolor}};
}
</style>
to the html template. However this is not working
Similar Questions do not answer this question yet and only show attribute binding as a solution:
Angular2 dynamic change CSS property
Dynamically updating css in Angular 2
https://scotch.io/tutorials/all-the-ways-to-add-css-to-angular-2-components
https://coryrylan.com/blog/introduction-to-angular-2-ngclass-and-ngstyle
It looks to me like you are just creating a new component called 'subcomponent', why not do that?
subcomponent.ts:
import { Component } from '#angular/core';
#Component({
selector: 'subcomponent',
templateUrl: './subcomponent.html',
})
export class SubComponent {
mycolor = 'blue';
}
subcomponent.html:
<style>
#header, #header a {
color: {{mycolor}};
}
</style>
To your #Component object, add
styles:[ `#header, #header a {
color: {{mycolor}};
}`]
So for example:
#Component({
template: `<header id="header" [style.background-color]="changeBackground()">
<div>
Some Text
Some Link
<subcomponent></subcomponent>
</div>
<div> ... a lot mor stuff </div>
</header>`,
styles: [ `#header, #header a {
color: {{mycolor}};
}`
`]
})
Use NgStyle as explained in this answer
https://stackoverflow.com/a/41903349
in short
<header id="header" [ngStyle]="getStyle()">
<div>
Some Text
Some Link
<subcomponent></subcomponent>
</div>
<div> ... a lot mor stuff </div>
</header>
and
getStyle(): any {
return {"background-color" : this.changeBackgroundColor()};
}
I have a Home component with this inside:
<alert type="info">Hello from ng2-bootstrap</alert>
Inside my home.style.scss, I have this:
:host .alert {
background-color: green;
}
which should change the background color to green, but it does not.
The above css code will produce this style:
[_nghost-wjn-3] .alert[_ngcontent-wjn-3] {
background-color: green;
}
and the final HTML looks like this:
<home _nghost-wjn-3="">
<div _ngcontent-wjn-3="" class="card-container">
<alert _ngcontent-wjn-3="" type="info" ng-reflect-type="info">
<div class="alert alert-info" role="alert" ng-reflect-initial-classes="alert" ng-reflect-ng-class="alert-info">
Hello from ng2-bootstrap Sat Sep 17 2016
</div>
</alert>
</div>
</home>
I don't know what the problem is here, but I think the selector is wrong. I'd like the final selector to be:
[_nghost-wjn-3] .alert
instead of:
[_nghost-wjn-3] .alert[_ngcontent-wjn-3]
Or in other words, why is there no _ngcontent-wjn-3 attribute on <div class="alert">...</div>?
Maybe I'm doing the whole thing wrong. What I'm trying to achieve is to customize the CSS of the individual bootstrap components (<alert> in the code above) as provided by the ng2-bootrap library (https://github.com/valor-software/ng2-bootstrap) inside my custom components (<home> in the code above).
I'm using the default view encapsulation (emulated) in the home component.
How can I do that please?
I figured it out myself. This is what I was looking for:
:host /deep/ .alert {
background-color: green;
}
The above code will produce the following:
[_nghost-wjn-3] .alert {
background-color: green;
}
This way I can modify the default styles of a bootstrap class (.alert, in this case) inside of my component <home>.
Source: https://angular.io/docs/ts/latest/guide/component-styles.html
You need:
[_nghost-wjn-3] alert[_ngcontent-wjn-3]
Instead of:
[_nghost-wjn-3] .alert[_ngcontent-wjn-3]
If you go and check your structure, alert tag has the ngcontent... attribute, not his div child with alert class.
I'm new to css and I can't figure out how to position one component inside another in React. I can show them separately, but when I put one inside another. I don't see the one inside. I think the problem is in the css file
#homePage{
section{
h1{
text-align: left; //this is shown
}
//here I want to add the other React component but I don't know how
}
}
And the render method:
<div id="homePage">
<Component1>
<section>
<h1>Hi</h1>
<Component2>
</Component2>
</section>
</Component1>
</div>
Thanks.
From what i understand , you could have the className attribute defined inside your Component2's HTML tags.
class Component2 extends Component{
render(){
return(
<section className="component2styles">
This is Component2
</section >
);
} }
Now , you can change ur style sheet as
#homePage{
section{
h1{
text-align: left; //this is shown
}
//components2 style will be nested here
section.component2styles{
border:1px solid blue;
}
}
}
Or as an alternative you can try inline-styles , seems to be gaining a lot of traction in React development.
render(){
var styleobj={color:'red'};
return( <section style={styleobj} > This is Component 2 </section> )
}
Did you add some class/id to your Component2 like <Component2 className="my-specific-class" /> to style it?
(btw, I hope your css is less/sass one to allow nested styles like you did)
EDIT
By adding className attr. to your Component2, I mean adding it in Component2 render method like
render: function() {
return (
<div id="your-id" className="your-class">
some html here
</div>
);
}