Created
November 7, 2017 06:16
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Lazy load using IntersectionObserver
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| import '../css/main.css'; | |
| console.log("message"); | |
| (function() { | |
| var observer; | |
| var index = 0; | |
| var options = { | |
| root: null, | |
| rootMargin: '0px', | |
| threshold: 0 | |
| } | |
| function addNewBoxes(entry) { | |
| entry.forEach((change) => { | |
| if (change.isIntersecting && index <= 10) { | |
| console.log(index); | |
| index = ++index; | |
| createNewBox(index); | |
| } | |
| if (index === 10) { | |
| observer.disconnect(); | |
| } | |
| }); | |
| } | |
| function createNewBox(index) { | |
| var newDiv = document.createElement("div"); | |
| var newContent = document.createTextNode(index); | |
| newDiv.setAttribute('class', 'bigbox'); | |
| newDiv.appendChild(newContent); | |
| document.getElementById("main").appendChild(newDiv); | |
| observer.observe(newDiv); | |
| } | |
| observer = new IntersectionObserver(addNewBoxes, options); | |
| createNewBox(0); | |
| })(); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Hello Webpack</title> | |
| </head> | |
| <body> | |
| <div id="top"></div> | |
| <div id="main"></div> | |
| <footer> | |
| <div class="footer" id="footer">Footer</div> | |
| </footer> | |
| <script src="app.js"></script> | |
| </body> | |
| </html> |
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