The technical principle analysis of the Angular Animate framework in the Java class library
Analysis of the technical principles of the Angular Animate framework in the Java class library
Overview:
Angular Animate is part of the AngularJS framework, which is used to achieve animation effect libraries.It uses JavaScript and CSS3 to create powerful animation and transition effects.This article will analyze the technical principles of the Angular Animate framework and provide examples of Java code.
The working principle of Angular Animate:
The main principle of Angular Animate is to trigger the animation based on the attribute changes of the DOM element.It uses JavaScript and CSS3 transition attributes to define the start and end of the animation.
First, you need to introduce the Angular Animate module in the Angular module:
var myApp = angular.module('myApp', ['ngAnimate']);
Then, by adding the `naganimate` instruction to bind the animation effect for the DOM element:
html
<div ng-app="myApp">
<button ng-click="show = !show">Toggle</button>
<div ng-show="show" ng-animate="'fade'">Content</div>
</div>
In the above example, when the value of the `SHOW` variable changes, the` ng-show` instruction will display or hide the DOM element according to the value of the variable.`ng -animate` instructions are used to define the name of animation effects.
To define the details of the animation effect for the `ng -animate` instruction, you can use the CSS3 Transition or Animation property:
css
.fade.ng-enter {
opacity: 0;
}
.fade.ng-enter-active {
transition: opacity 1s;
opacity: 1;
}
In the above CSS rules, the `.ng-onter` and` .NG-ENTER-Active` class defined the start and end of the gradient animation.The `ng-ins' represents the initial state of the animation, and the` ng-inter-active` class indicates the final state of the animation.
Angular Animate framework in the Java class library implementation:
When using the Angular Animate framework in the Java library, you need to introduce the JavaScript and CSS files of Angular Animate into the project.You can use Maven or manually add these files.
In the Java code, we can dynamically generate the HTML page through the Angular script engine and use the Angular Animate framework on the page.
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class AngularAnimateExample {
public static void main(String[] args) {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("javascript");
try {
// Generate HTML page using Angular and Angular Animate
String html = "<html>"
+ "<head>"
+ "<script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js'></script>"
+ "<script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular-animate.min.js'></script>"
+ "<style>"
+ ".fade.ng-enter {"
+ " opacity: 0;"
+ "}"
+ ".fade.ng-enter-active {"
+ " transition: opacity 1s;"
+ " opacity: 1;"
+ "}"
+ "</style>"
+ "</head>"
+ "<body>"
+ "<div ng-app>"
+ "<button ng-click='show = !show'>Toggle</button>"
+ "<div ng-show='show' ng-animate=\"'fade'\">Content</div>"
+ "</div>"
+ "</body>"
+ "</html>";
// Execute the HTML page using the script engine
engine.eval(html);
} catch (ScriptException e) {
e.printStackTrace();
}
}
}
In the above examples, we use the Scriptengine API to dynamically generate and execute Angular and Angular Animate's HTML page.
Summarize:
The Angular Animate framework is part of AngularJS. The animation effect is achieved through JavaScript and CSS3.It triggers the animation based on the attribute change of the DOM element, and uses AngularJS instructions and CSS3 transition attributes to define the start and end of the animation.When using the Angular Animate framework in the Java library, the JavaScript and CSS files of Angular Animate need to be introduced into the project, and the Angular scripting engine is dynamically generated and executed by the HTML page.
