MediaWiki:Common.js
From WikiMSK
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/* Any JavaScript here will be loaded for all users on every page load. */
(function() {
// Get all the <h2> headings
const headings = document.querySelectorAll('.mw-parser-output h2')
Array.prototype.forEach.call(headings, heading => {
// Give each <h2> a toggle button child
// with the SVG plus/minus icon
heading.innerHTML = `
<button aria-expanded="false">
${heading.textContent}
<svg aria-hidden="true" focusable="false" viewBox="0 0 10 10">
<rect class="vert" height="8" width="2" y="1" x="4"/>
<rect height="2" width="8" y="4" x="1"/>
</svg>
</button>
`
// Function to create a node list
// of the content between this <h2> and the next
const getContent = (elem) => {
let elems = []
while (elem.nextElementSibling && elem.nextElementSibling.tagName !== 'H2') {
elems.push(elem.nextElementSibling)
elem = elem.nextElementSibling
}
// Delete the old versions of the content nodes
elems.forEach((node) => {
node.parentNode.removeChild(node)
})
return elems
}
// Assign the contents to be expanded/collapsed (array)
let contents = getContent(heading)
// Create a wrapper element for `contents` and hide it
let wrapper = document.createElement('div')
wrapper.hidden = true
// Add each element of `contents` to `wrapper`
contents.forEach(node => {
wrapper.appendChild(node)
})
// Add the wrapped content back into the DOM
// after the heading
heading.parentNode.insertBefore(wrapper, heading.nextElementSibling)
// Assign the button
let btn = heading.querySelector('button')
btn.onclick = () => {
// Cast the state as a boolean
let expanded = btn.getAttribute('aria-expanded') === 'true' || false
// Switch the state
btn.setAttribute('aria-expanded', !expanded)
// Switch the content's visibility
wrapper.hidden = expanded
}
})
})()