Created
March 16, 2019 05:47
-
-
Save a1mersnow/2bcf41ac4c4d2586e48ccd5cec5c9768 to your computer and use it in GitHub Desktop.
catch all boxes in page(this may not work well for fixed or sticky positioned box)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| void function () { | |
| const canvas = document.createElement('canvas') | |
| canvas.width = document.documentElement.offsetWidth | |
| canvas.height = document.documentElement.offsetHeight | |
| canvas.style.position = 'absolute' | |
| canvas.style.left = '0' | |
| canvas.style.right = '0' | |
| canvas.style.top = '0' | |
| canvas.style.bottom = '0' | |
| canvas.style.zIndex = '99999' | |
| document.body.appendChild(canvas) | |
| const ctx = canvas.getContext('2d') | |
| draw(ctx, getAllRects()) | |
| function draw (ctx, rects) { | |
| let i = 0 | |
| ctx.strokeStyle = 'red' | |
| window.requestAnimationFrame(_draw) | |
| function _draw () { | |
| let {x, y, width, height} = rects[i++] | |
| ctx.strokeRect(x, y, width, height) | |
| if (i < rects.length) { | |
| window.requestAnimationFrame(_draw) | |
| } else { | |
| console.log('%cDONE', 'background-color: green; color: white; padding: 0.3em 0.5em;') | |
| } | |
| } | |
| } | |
| function getAllRects () { | |
| const allElements = document.querySelectorAll('*') | |
| const rects = [] | |
| const {x: htmlX, y: htmlY} = document.documentElement.getBoundingClientRect() | |
| allElements.forEach(element => { | |
| const eachElRects = Array.from(element.getClientRects()).filter(rect => { | |
| return rect.width || rect.height | |
| }).map(rect => { | |
| return { | |
| x: rect.x - htmlX, | |
| y: rect.y - htmlY, | |
| width: rect.width, | |
| height: rect.height | |
| } | |
| }) | |
| rects.push(...eachElRects) | |
| }) | |
| return rects | |
| } | |
| }() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment