Pulse7
8/19/2017 - 12:58 PM

Observable from mouse events

Observable from mouse events

main.ts
content_copyfile_download
import {Observable} from "rxjs";

let circle = document.getElementById("circle");
let source = Observable.fromEvent(document,"mousemove")
    .map((e:MouseEvent)=>
        {
            return { 
                x:e.clientX,
                y:e.clientY
            };
        })
    .filter(value=>value.x<500)
    .delay(300);

function onNext(value){
    
    circle.style.left = `${value.x}px`;
    circle.style.top = `${value.y}px`;
    console.log(circle.style.left);
}

source.subscribe(
    onNext,
    e=>console.log(`error: ${e}`),
    ()=>console.log("complete")
);
index.html
content_copyfile_download
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        #circle{
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background-color: red;
            position: absolute;
        }
    </style>
</head>
<body>
    <div id="circle"></div>
<script src="app.js"></script>
</body>
</html>