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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,69 +1,106 @@ | ||
| class Collapse { | ||
| constructor() { | ||
| this.toggleElements = Array.prototype.slice.call( | ||
| document.querySelectorAll('[data-toggle="collapse"]'), | ||
| ); | ||
| this.collapsibleElements = Array.prototype.slice.call( | ||
| document.querySelectorAll(".collapse"), | ||
| const controls = Array.prototype.slice.call( | ||
| document.querySelectorAll("[aria-expanded][aria-controls]"), | ||
| ); | ||
| this.collapsibleElements = controls.map((control) => [ | ||
| control, | ||
| document.getElementById(control.getAttribute("aria-controls")), | ||
| ]); | ||
| this.handleClick = this.handleClick.bind(this); | ||
| this.init(); | ||
| } | ||
| handleClick(event) { | ||
| const targetId = | ||
| event.target.dataset.target || event.target.getAttribute("href"); | ||
| const targetElement = document.querySelector(targetId); | ||
| if (!targetElement) { | ||
|
|
||
| handleClick({ target: control }) { | ||
| const container = document.getElementById( | ||
| control.getAttribute("aria-controls"), | ||
| ); | ||
| if (!container) { | ||
| return false; | ||
| } | ||
|
|
||
| // Collapse this element | ||
| if (targetElement.getAttribute("aria-expanded") === "true") { | ||
| targetElement.setAttribute("aria-expanded", "false"); | ||
| targetElement.style.maxHeight = 0; | ||
| if (control.getAttribute("aria-expanded") === "true") { | ||
| control.setAttribute("aria-expanded", "false"); | ||
| container.style.maxHeight = 0; | ||
| return true; | ||
| } | ||
|
|
||
| // Expand this element | ||
| const naturalHeight = parseInt(targetElement.dataset.naturalHeight); | ||
| const naturalHeight = parseInt(container.dataset.naturalHeight); | ||
| if (isNaN(naturalHeight) || !naturalHeight) { | ||
| return false; | ||
| } | ||
| targetElement.setAttribute("aria-expanded", "true"); | ||
| targetElement.style.maxHeight = naturalHeight + "px"; | ||
| control.setAttribute("aria-expanded", "true"); | ||
| container.hidden = false; | ||
|
|
||
| // Need to use requestAnimationFrame to force the browser to repaint after | ||
| // making the container visible, or it will skip the max-height transition | ||
| window.requestAnimationFrame(function () { | ||
| container.style.maxHeight = naturalHeight + "px"; | ||
| }); | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| handleTransitionEnd({ propertyName, target: container }) { | ||
| if (propertyName === "max-height") { | ||
| container.hidden = parseInt(container.style.maxHeight) === 0; | ||
| } | ||
| } | ||
|
|
||
| init() { | ||
| var instance = this; | ||
| const instance = this; | ||
|
|
||
| // Handle click events on the elements that toggle | ||
| this.toggleElements.forEach(function (element) { | ||
| element.addEventListener("click", function (event) { | ||
| this.collapsibleElements.forEach(function ([control, container]) { | ||
| // Handle click events on the elements that toggle | ||
| control.addEventListener("click", function (event) { | ||
| if (instance.handleClick(event)) { | ||
| event.preventDefault(); | ||
| } | ||
| }); | ||
| }); | ||
|
|
||
| // Keep track of the natural heights of the collapsed elements | ||
| this.collapsibleElements.forEach(function (element) { | ||
| const initiallyVisible = element.classList.contains("show"); | ||
| element.classList.add("show"); | ||
|
|
||
| const naturalHeight = element.getBoundingClientRect().height; | ||
| element.dataset.naturalHeight = naturalHeight; | ||
| element.style.overflow = "hidden"; | ||
| element.style.maxHeight = initiallyVisible | ||
| ? naturalHeight + "px" | ||
| : 0; | ||
| element.style.transition = "max-height 0.25s"; | ||
| element.setAttribute( | ||
| "aria-expanded", | ||
| initiallyVisible ? "true" : "false", | ||
| // Keep track of the natural heights of the collapsed elements | ||
| container.addEventListener( | ||
| "transitionend", | ||
| instance.handleTransitionEnd, | ||
| ); | ||
| instance.resetNaturalHeight(control, container); | ||
| }); | ||
|
|
||
| // Resets container natural heights on window resize | ||
| let timer = null; | ||
| window.addEventListener("resize", function () { | ||
| window.clearTimeout(timer); | ||
| timer = window.setTimeout(function () { | ||
| instance.collapsibleElements.forEach(function ([ | ||
| control, | ||
| container, | ||
| ]) { | ||
| instance.resetNaturalHeight(control, container); | ||
| }); | ||
| }, 50); | ||
| }); | ||
| } | ||
|
|
||
| resetNaturalHeight(control, container) { | ||
| // Default to fully visible | ||
| container.style.transition = ""; | ||
| container.style.maxHeight = ""; | ||
| container.style.overflow = ""; | ||
| container.hidden = false; | ||
|
|
||
| const initiallyVisible = | ||
| control.getAttribute("aria-expanded") === "true"; | ||
| const naturalHeight = container.getBoundingClientRect().height; | ||
| container.dataset.naturalHeight = naturalHeight; | ||
|
|
||
| // Set container dimensions | ||
| container.style.overflow = "hidden"; | ||
| container.style.maxHeight = initiallyVisible ? naturalHeight + "px" : 0; | ||
| container.style.transition = "max-height 0.25s"; | ||
| container.hidden = !initiallyVisible; | ||
| } | ||
| } | ||
|
|
||
| export default Collapse; |
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