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iOS 8 position: fixed; input element workaround
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0" /> | |
| <title>iOS 8 position: fixed; input element workaround</title> | |
| <style> | |
| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| body { | |
| position: relative; | |
| } | |
| #a { | |
| height: 2000px; | |
| background: linear-gradient(red, blue); | |
| } | |
| #b { | |
| position: fixed; | |
| bottom: 20px; | |
| left: 0; | |
| width: 100%; | |
| height: 100px; | |
| background: rgba(0, 0, 0, 0.5); | |
| } | |
| textarea { | |
| width: 80%; | |
| height: 100%; | |
| margin-left: 10%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="a"></div> | |
| <div id="b"> | |
| <textarea></textarea> | |
| </div> | |
| <script> | |
| //Get the fixed element, and the input element it contains. | |
| var fixed_el = document.getElementById('b'); | |
| var input_el = document.querySelector('textarea'); | |
| //Listen for touchstart, focus will fire too late. | |
| input_el.addEventListener('touchstart', function() { | |
| //If using a non-px value, you will have to get clever, or just use 0 and live with the temporary jump. | |
| var bottom = parseFloat(window.getComputedStyle(fixed_el).bottom); | |
| //Switch to position absolute. | |
| fixed_el.style.position = 'absolute'; | |
| fixed_el.style.bottom = (document.height - (window.scrollY + window.innerHeight) + bottom) + 'px'; | |
| //Switch back when focus is lost. | |
| function blured() { | |
| fixed_el.style.position = ''; | |
| fixed_el.style.bottom = ''; | |
| input_el.removeEventListener('blur', blured); | |
| } | |
| input_el.addEventListener('blur', blured); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0" /> | |
| <title>iOS 8 position: fixed; input element workaround</title> | |
| <style> | |
| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| body { | |
| position: relative; | |
| } | |
| #a { | |
| height: 2000px; | |
| background: linear-gradient(red, blue); | |
| } | |
| #b { | |
| position: fixed; | |
| bottom: 20px; | |
| left: 0; | |
| width: 100%; | |
| height: 100px; | |
| background: rgba(0, 0, 0, 0.5); | |
| } | |
| textarea { | |
| width: 80%; | |
| height: 100%; | |
| margin-left: 10%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="a"></div> | |
| <div id="b"> | |
| <textarea></textarea> | |
| </div> | |
| </body> | |
| </html> |
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