Created
August 24, 2016 19:50
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Aurelia DBMonster with IntersectionObserver
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| <template> | |
| <require from="./when-visible"></require> | |
| <div> | |
| <table class="table table-striped latest-data"> | |
| <tbody> | |
| <tr repeat.for="db of databases"> | |
| <td class="dbname"> | |
| ${db.dbname & oneTime & whenVisible} | |
| </td> | |
| <td class="query-count"> | |
| <span class-name.one-time="db.lastSample.countClassName & whenVisible"> | |
| ${db.lastSample.nbQueries & oneTime & whenVisible} | |
| </span> | |
| </td> | |
| <td repeat.for="q of db.lastSample.topFiveQueries & oneTime" | |
| class-name.one-time="q.elapsedClassName & whenVisible"> | |
| ${q.formatElapsed & oneTime & whenVisible} | |
| <div class="popover left"> | |
| <div class="popover-content"> | |
| ${q.query & oneTime & whenVisible} | |
| <foo>hello world</foo> | |
| </div> | |
| <div class="arrow"></div> | |
| </div> | |
| </td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| </template> |
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| export class App { | |
| databases = []; | |
| activate() { | |
| let load; | |
| load = () => { | |
| this.databases = ENV.generateData().toArray(); | |
| Monitoring.renderRate.ping(); | |
| setTimeout(load, ENV.timeout); | |
| }; | |
| load(); | |
| } | |
| } |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Aurelia</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <link rel="stylesheet" href="https://jdanyow.github.io/aurelia-dbmonster/styles/bootstrap.min.css"> | |
| <link rel="stylesheet" href="https://jdanyow.github.io/aurelia-dbmonster/styles/styles.css"> | |
| </head> | |
| <body> | |
| <div aurelia-app> | |
| <h1>Loading...</h1> | |
| </div> | |
| <script src="https://jdanyow.github.io/aurelia-dbmonster/lib/ENV.js"></script> | |
| <script src="https://jdanyow.github.io/aurelia-dbmonster/lib/memory-stats.js"></script> | |
| <script src="https://jdanyow.github.io/aurelia-dbmonster/lib/monitor.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/config.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script> | |
| <script> | |
| require(['aurelia-bootstrapper']); | |
| </script> | |
| </body> | |
| </html> |
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| function handleIntersectionEvents(entries, observer) { | |
| let i = entries.length; | |
| while (i--) { | |
| const entry = entries[i]; | |
| const inView = entry.intersectionRatio > 0; | |
| const element = entry.target; | |
| element.__inView = inView; | |
| // <debugging-colors> | |
| /*const color = inView ? 'blue' : 'red'; | |
| if (element.style.color !== color) { | |
| element.style.color = color; | |
| }*/ | |
| // </debugging-colors> | |
| if (inView) { | |
| let j = element.bindings.length; | |
| while (j--) { | |
| const binding = element.bindings[j]; | |
| binding.standardUpdateTarget(binding.__lastTargetValue); | |
| } | |
| } | |
| } | |
| } | |
| function observe(root, binding, unobserve) { | |
| let observer = (root || window).__intersectionObserver; | |
| if (observer === undefined) { | |
| observer = (root || window).__intersectionObserver = new IntersectionObserver(handleIntersectionEvents, { root }); | |
| } | |
| let element = binding.target; | |
| if (element.nodeType === 3) { | |
| element = element.parentElement; | |
| } | |
| if (unobserve) { | |
| element.bindings.splice(element.bindings.indexOf(binding), 1); | |
| if (element.bindings.length === 0) { | |
| observer.unobserve(element); | |
| } | |
| return; | |
| } | |
| if (element.bindings === undefined) { | |
| element.bindings = []; | |
| } | |
| if (element.bindings.length === 0) { | |
| observer.observe(element); | |
| } | |
| element.bindings.push(binding); | |
| } | |
| export class WhenVisibleBindingBehavior { | |
| bind(binding, source, intersectionRoot) { | |
| let element = binding.target; | |
| if (element.nodeType === 3) { | |
| element = element.parentElement; | |
| } | |
| element.__inView = !!element.__inView; | |
| binding.__initialized = false; | |
| binding.standardUpdateTarget = binding.updateTarget; | |
| binding.updateTarget = function(value) { | |
| this.__lastTargetValue = value; | |
| let element = binding.target; | |
| if (element.nodeType === 3) { | |
| element = element.parentElement; | |
| } | |
| if (element.__inView || !this.__initialized) { | |
| this.__initialized = true; | |
| this.standardUpdateTarget(value); | |
| } | |
| }; | |
| observe(intersectionRoot, binding, false); | |
| } | |
| unbind(binding, source) { | |
| observe(intersectionRoot, binding, true); | |
| binding.updateTarget = binding.standardUpdateTarget; | |
| binding.standardUpdateTarget = null; | |
| binding.__lastTargetValue = null; | |
| binding.__initialized = false; | |
| } | |
| } |
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