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Screen width MediaQueries in JS without a library
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| <!-- Adapted from http://seesparkbox.com/foundry/breakpoint_checking_in_javascript_with_css_user_values --> | |
| <!doctype html> | |
| <html> | |
| <head> | |
| <title>CSS Media Check</title> | |
| <style type="text/css"> | |
| #mediaquery{ | |
| -webkit-transition: width .001s; | |
| -moz-transition: width .001s; | |
| -ms-transition: width .001s; | |
| -o-transition: width .001s; | |
| transition: width .001s; | |
| } | |
| #mediaquery:after { | |
| content: "small"; | |
| display: none; | |
| } | |
| @media all and (min-width: 10px) { | |
| #mediaquery { | |
| width: 50px; | |
| } | |
| #mediaquery:after { | |
| content: "small"; | |
| } | |
| } | |
| @media all and (min-width: 600px) { | |
| #mediaquery{ | |
| width: 100px; | |
| } | |
| #mediaquery:after { | |
| content: "medium"; | |
| } | |
| } | |
| @media all and (min-width: 800px) { | |
| #mediaquery{ | |
| width: 200px; | |
| } | |
| #mediaquery:after { | |
| content: "large"; | |
| } | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <!-- query element --> | |
| <div id="mediaquery"></div> | |
| <script> | |
| window.MQ = {}; | |
| window.MQ.element = document.getElementById("mediaquery"); | |
| window.MQ.currentSize = ''; | |
| // Generic event triggering | |
| var trigger = function (type, element) { | |
| var event; | |
| if (document.createEvent) { | |
| event = document.createEvent("HTMLEvents"); | |
| event.initEvent(type, true, true); | |
| } else { | |
| event = document.createEventObject(); | |
| event.eventType = type; | |
| } | |
| event.eventName = type; | |
| if (document.createEvent) { | |
| element.dispatchEvent(event); | |
| } else { | |
| element.fireEvent("on" + event.eventType, event); | |
| } | |
| } | |
| var updateMQ = function () { | |
| var size = window.getComputedStyle(window.MQ.element,":after").getPropertyValue("content"); | |
| window.MQ.currentSize = size; | |
| trigger('MQ.'+size, window); | |
| } | |
| // Listen for MQ changes | |
| window.addEventListener('MQ.small', function() { | |
| console.log('MQ.small fired'); | |
| }, true); | |
| window.addEventListener('MQ.medium', function() { | |
| console.log('MQ.medium fired'); | |
| }, true); | |
| window.addEventListener('MQ.large', function() { | |
| console.log('MQ.large fired'); | |
| }, true); | |
| // Check for all browsers | |
| window.MQ.element.addEventListener('webkitTransitionEnd', updateMQ, true); | |
| window.MQ.element.addEventListener('MSTransitionEnd', updateMQ, true); | |
| window.MQ.element.addEventListener('oTransitionEnd', updateMQ, true); | |
| window.MQ.element.addEventListener('transitionend', updateMQ, true); | |
| </script> | |
| </body> | |
| </html> |
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