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December 1, 2015 02:49
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Javascript that draws an interactive grid to test if the document to be rendered complies with facebook's 20% text to image rule. Click the squares with text.
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| <style type="text/css"> | |
| @media screen { | |
| body { margin: 0; padding: 0; } | |
| #twenty-percent-grid { position: absolute; left: 0; right: 0; bottom: 0; top: 0; overflow: auto; } | |
| #twenty-percent-grid .grid-cell { float: left; width: 20vw; margin-left: -1px; margin-top: -1px; margin-bottom: -1px; margin-right: -1px; height: 20vh; border: 1px solid rgba(0, 225, 0, 0.4); } | |
| #twenty-percent-grid .grid-cell:hover { background: rgba(0, 225, 0, 0.01); } | |
| #twenty-percent-grid .grid-cell.js-active { background: rgba(0, 225, 0, 0.25); } | |
| #twenty-percent-grid.warning .grid-cell { border: 1px solid rgba(225, 0, 0, 0.4); } | |
| #twenty-percent-grid.warning .grid-cell:hover { background: rgba(225, 0, 0, 0.1); } | |
| #twenty-percent-grid.warning .grid-cell.js-active { background: rgba(225, 0, 0, 0.25); } | |
| } | |
| </style> | |
| <script type="text/javascript"> | |
| document.addEventListener("DOMContentLoaded", drawGrid); | |
| function drawGrid() { | |
| var showGrid = true | |
| if (showGrid){ | |
| var insertGrid = document.createElement('div') | |
| insertGrid.setAttribute("id", "twenty-percent-grid"); | |
| document.body.appendChild(insertGrid); | |
| for (i = 0; i < 25; i++ ) { | |
| var grid = document.getElementById('twenty-percent-grid') | |
| var cell = document.createElement('div') | |
| cell.className = 'grid-cell'; | |
| grid.appendChild(cell); | |
| addSelectListeners(); | |
| } | |
| } | |
| } | |
| function addSelectListeners() { | |
| var cells = document.getElementsByClassName('grid-cell') | |
| for(var i=0;i<cells.length;i++){ | |
| cells[i].addEventListener('click', selectCell, false); | |
| } | |
| } | |
| function selectCell() { | |
| setActiveCell(this); | |
| } | |
| function setActiveCell(cell) { | |
| var activeCells = document.getElementsByClassName('js-active') | |
| if (cell.classList.contains('js-active')) { | |
| cell.classList.remove('js-active') | |
| } | |
| else { | |
| cell.classList.add('js-active') | |
| } | |
| checkWarning(activeCells); | |
| } | |
| function checkWarning(cellsToCheck) { | |
| var grid = document.getElementById('twenty-percent-grid') | |
| if (cellsToCheck.length > 5) { | |
| grid.className = 'warning' | |
| } | |
| else if (grid.classList.contains('warning')) { | |
| grid.classList.remove('warning') | |
| } | |
| } | |
| </script> |
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