Created
October 10, 2019 07:59
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Container Query using ResizeObserver
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/** | |
* Written by Philip Walton | |
* @see https://philipwalton.com/articles/responsive-components-a-solution-to-the-container-queries-problem/ | |
*/ | |
if ('ResizeObserver' in self) { | |
// Create a single ResizeObserver instance to handle all | |
// container elements. The instance is created with a callback, | |
// which is invoked as soon as an element is observed as well | |
// as any time that element's size changes. | |
var ro = new ResizeObserver(function(entries) { | |
// Default breakpoints that should apply to all observed | |
// elements that don't define their own custom breakpoints. | |
var defaultBreakpoints = {SM: 384, MD: 576, LG: 768, XL: 960}; | |
entries.forEach(function(entry) { | |
// If breakpoints are defined on the observed element, | |
// use them. Otherwise use the defaults. | |
var breakpoints = entry.target.dataset.breakpoints ? | |
JSON.parse(entry.target.dataset.breakpoints) : | |
defaultBreakpoints; | |
// Update the matching breakpoints on the observed element. | |
Object.keys(breakpoints).forEach(function(breakpoint) { | |
var minWidth = breakpoints[breakpoint]; | |
if (entry.contentRect.width >= minWidth) { | |
entry.target.classList.add(breakpoint); | |
} else { | |
entry.target.classList.remove(breakpoint); | |
} | |
}); | |
}); | |
}); | |
// Find all elements with the `data-observe-resizes` attribute | |
// and start observing them. | |
var elements = document.querySelectorAll('[data-observe-resizes]'); | |
for (var element, i = 0; element = elements[i]; i++) { | |
ro.observe(element); | |
} | |
} |
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