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| 1 | +import { loadModules } from "https://unpkg.com/esri-loader/dist/esm/esri-loader.js"; |
| 2 | + |
| 3 | + |
| 4 | +// scrollStop from https://vanillajstoolkit.com/helpers/scrollstop/ |
| 5 | +var scrollStop = function (callback) { |
| 6 | +// Make sure a valid callback was provided |
| 7 | +if (!callback || typeof callback !== 'function') return; |
| 8 | +// Setup scrolling variable |
| 9 | +var isScrolling; |
| 10 | +// Listen for scroll events |
| 11 | +window.addEventListener('scroll', function (event) { |
| 12 | +// Clear our timeout throughout the scroll |
| 13 | +window.clearTimeout(isScrolling); |
| 14 | +// Set a timeout to run after scrolling ends |
| 15 | +isScrolling = setTimeout(function() { |
| 16 | +// Run the callback |
| 17 | +callback(); |
| 18 | +}, 66); |
| 19 | +}, false); |
| 20 | +}; |
| 21 | + |
| 22 | +const isElementOutViewport = (el) => { |
| 23 | + var rect = el.getBoundingClientRect(); |
| 24 | + return rect.bottom < 0 || rect.right < 0 || rect.left > window.innerWidth || rect.top > window.innerHeight; |
| 25 | +} |
| 26 | + |
| 27 | +const createMap = async (element) => { |
| 28 | + var childElement = document.createElement("div"); |
| 29 | + element.appendChild(childElement); |
| 30 | + // More info on esri-loader's loadModules function: |
| 31 | + // https://github.com/Esri/esri-loader#loading-modules-from-the-arcgis-api-for-javascript |
| 32 | + const [Map, SceneView] = await loadModules([ |
| 33 | + "esri/Map", |
| 34 | + "esri/views/SceneView" |
| 35 | + ], {css: true}); |
| 36 | + |
| 37 | + const map = new Map({ |
| 38 | + basemap: "streets" |
| 39 | + }); |
| 40 | + |
| 41 | + const viewOptions = { |
| 42 | + container: childElement, |
| 43 | + map: map, |
| 44 | + center: [-101.17, 21.78], |
| 45 | + zoom: 2 |
| 46 | + }; |
| 47 | + |
| 48 | + // 3D: |
| 49 | + new SceneView(viewOptions); |
| 50 | +}; |
| 51 | + |
| 52 | + |
| 53 | +window.addEventListener("load", (event) => { |
| 54 | + |
| 55 | + const allNodes = []; |
| 56 | + |
| 57 | + const checkAllNodes = () => { |
| 58 | + allNodes.forEach((node) => { |
| 59 | + if (isElementOutViewport(node)) { |
| 60 | + if(node.classList.contains('intersected')) { |
| 61 | + node.classList.remove('intersected'); |
| 62 | + while(node.firstChild) { |
| 63 | + node.removeChild(node.firstChild); |
| 64 | + } |
| 65 | + } |
| 66 | + } else { |
| 67 | + if(!node.classList.contains('intersected')) { |
| 68 | + node.classList.add('intersected'); |
| 69 | + createMap(node); |
| 70 | + } |
| 71 | + |
| 72 | + } |
| 73 | + }); |
| 74 | + }; |
| 75 | + |
| 76 | + const rootElement = document.getElementById("wrapperDiv"); |
| 77 | + for(let i = 0; i < 100; i++) { |
| 78 | + var element = document.createElement("div"); |
| 79 | + element.classList.add('map'); |
| 80 | + rootElement.appendChild(element); |
| 81 | + allNodes.push(element); |
| 82 | + } |
| 83 | + |
| 84 | + scrollStop(function () { |
| 85 | + console.log('Scrolling has stopped.'); |
| 86 | + checkAllNodes(); |
| 87 | + }); |
| 88 | + |
| 89 | + checkAllNodes(); // once on page load |
| 90 | +}, false); |
| 91 | + |
| 92 | + |
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