animate-on-scroll-sample-project
v0.0.0
Published
A very simple Angular directive with no dependencies that allows you to add CSS animations on elements, once that element has been reached via scrolling the page. Works with whatever CSS animation you choose, including Animate.css as shown in examples. A
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ng2-animate-on-scroll
A very simple Angular directive with no dependencies that allows you to add CSS animations on elements, once that element has been reached via scrolling the page. Works with whatever CSS animation you choose, including Animate.css as shown in examples. An example without animate.css can be found here, with animate.css can be found here.
Installation
To install the directive in your project, run:
$ npm install ng2-animate-on-scroll --save
Using the directive
Modify the following in your app module:
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
// import third-party module
import { AnimateOnScrollModule } from 'ng2-animate-on-scroll';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
// import module here
AnimateOnScrollModule.forRoot()
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Use the directive in your component template:
<div animateOnScroll animationName="animation-class-name"></div>
animationName attribute
(Optional). The animationName
attribute is for the name(s) of the CSS class(es) to be added at the time the element appears. In cases when no animation is required (e.g in a ngif case) specify null. Here is a real-world example if you were using the Animate.css library in your project:
<div class="container">
long scrolling content..
<div class="animated" animateOnScroll animationName="fadeIn">
animated content upon appearing in the viewport..
</div>
</div>
or
<div class="container">
long scrolling content..
<div animateOnScroll animationName="animated fadeIn">
animated content upon appearing in the viewport..
</div>
</div>
Animate.css Peculiarity
If you're using Animate.css with this component and you're trying to animate an element IN to view (fadeIn, slideInLeft etc), you may experience "flashing" when the element scrolls into the viewport (i.e. the element will be shown, then be hidden, then animate into view). This can be mitigated by overriding Animate.css's .animated
class, then applying visibility: hidden;
to the element you want to hide:
.animated {
visibility: visible !important;
}
.hide-on-init {
visibility: hidden;
}
<div class="container">
long scrolling content..
<div class="hide-on-init" animateOnScroll animationName="animated fadeIn">
animated content upon appearing in the viewport..
</div>
</div>
offset attribute
You can also optionally add an offset
attribute (thanks siegerx3
) to specify the number of pixels you would need to scroll to below the top of the element for the animation to activate. The default is 80 pixels and the value given can be positive or negative.
<div animateOnScroll animationName="animated slideDown" offset="120">
content with different pixel offset specified
</div>
Options available
| Options | Type | Comments | |:------------:|:-------------:|:-------------:| | animationName | string/null | Add animation class or null in case no animation is required | | offset | number | For scroll Listener, to add offsets | | useScroll | boolean | Add for using scroll Listener, default is true and uses intersection observer | | threshold | number | Add threshold value for intersection observer only |
Developing ng2-animate-on-scroll with the demo application
- After cloning this repo, install dependencies with
npm install
. - The command
npm run watch
will build the library in watch mode (you can alternately usenpm run build:lib
if you prefer not to run in watch mode). 3. Finally,npm run start
will start the server for the demo app. If you prefer you can usenpm run dev:ssr
to start the demo in server rendered mode using Angular Universal.
License
MIT © Aaron Hazelton