This tests the performance impact of "automount"ing automatically.
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January 8, 2018 21:14
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auto-automount test
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| <!doctype html> | |
| <script src="./node_modules/steal/steal.js"></script> |
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| import stache from "can-stache"; | |
| import viewCallbacks from "can-view-callbacks"; | |
| import canSymbol from "can-symbol"; | |
| const viewModelSymbol = canSymbol.for("can.viewModel"); | |
| var obs = new MutationObserver(function MUTATION_HANDLER(mutationsList) { | |
| for(let mutation of mutationsList) { | |
| if (mutation.type === "childList") { | |
| for (let addedNode of mutation.addedNodes) { | |
| if (!addedNode[viewModelSymbol] && viewCallbacks._tags[addedNode.tagName.toLowerCase()]) { | |
| // element should be mounted | |
| } | |
| } | |
| } | |
| } | |
| }); | |
| obs.observe(document.documentElement, { childList: true, subtree: true }); | |
| function renderDivs(num) { | |
| let viewStr = ""; | |
| for (let i=0; i<num; i++) { | |
| viewStr += `<div>div ${i}</div>`; | |
| } | |
| const view = stache(viewStr); | |
| document.body.appendChild( | |
| view() | |
| ); | |
| console.log(`rendered ${num} divs`); | |
| } | |
| const button = document.createElement("button"); | |
| button.innerHTML = "run test"; | |
| button.addEventListener("click", function() { | |
| renderDivs(500); | |
| }); | |
| document.body.appendChild(button); |
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| { | |
| "name": "auto-automount-test", | |
| "version": "1.0.0", | |
| "description": "", | |
| "main": "index.js", | |
| "scripts": { | |
| "test": "echo \"Error: no test specified\" && exit 1" | |
| }, | |
| "keywords": [], | |
| "author": "", | |
| "license": "ISC", | |
| "dependencies": { | |
| "can-stache": "^4.0.0-pre.50", | |
| "can-symbol": "^1.0.0-pre.4", | |
| "can-view-callbacks": "^4.0.0-pre.10", | |
| "steal": "^1.6.2" | |
| } | |
| } |
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