// ==UserScript==
// @name LINUX.DO Load More Topics Manually
// @name:zh-CN LINUX.DO 手动加载更多话题
// @namespace https://www.pipecraft.net/
// @homepageURL https://github.com/utags/userscripts#readme
// @supportURL https://github.com/utags/userscripts/issues
// @version 0.1.0
// @description Load more topics manually with enhanced UI and error handling.
// @description:zh-CN 手动加载更多话题，具有增强的用户界面和错误处理。
// @author Pipecraft
// @license MIT
// @match https://linux.do/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=linux.do
// @grant none
// ==/UserScript==
;(function () {
'use strict'
// Configuration constants
const CONFIG = {
BUTTON_ID: 'userscript-load-more-button',
SENTINEL_SELECTOR: '.load-more-sentinel',
LOAD_TIMEOUT: 1000,
OBSERVER_DELAY: 100,
DEBUG: false,
}
let isLoading = false
/**
* Log debug messages if debug mode is enabled
* @param {string} message - The message to log
* @param {any} data - Optional data to log
*/
function debugLog(message, data = null) {
if (CONFIG.DEBUG) {
console.log(`[Load More Manually] ${message}`, data || '')
}
}
/**
* Create and style the load more button
* @returns {HTMLButtonElement} The created button element
*/
function createLoadMoreButton() {
const button = document.createElement('button')
button.id = CONFIG.BUTTON_ID
button.textContent = 'Load More'
button.className = 'userscript-load-more-btn'
// Apply modern button styles
Object.assign(button.style, {
width: '100%',
margin: '16px 0',
padding: '12px 24px',
border: 'none',
borderRadius: '8px',
backgroundColor: '#007bff',
color: '#ffffff',
fontSize: '14px',
fontWeight: '500',
cursor: 'pointer',
transition: 'all 0.2s ease',
boxShadow: '0 2px 4px rgba(0, 123, 255, 0.2)',
})
// Add hover and active states
button.addEventListener('mouseenter', () => {
if (!isLoading) {
button.style.backgroundColor = '#0056b3'
button.style.transform = 'translateY(-1px)'
button.style.boxShadow = '0 4px 8px rgba(0, 123, 255, 0.3)'
}
})
button.addEventListener('mouseleave', () => {
if (!isLoading) {
button.style.backgroundColor = '#007bff'
button.style.transform = 'translateY(0)'
button.style.boxShadow = '0 2px 4px rgba(0, 123, 255, 0.2)'
}
})
return button
}
/**
* Update button state during loading
* @param {HTMLButtonElement} button - The button element
* @param {boolean} loading - Whether the button is in loading state
*/
function updateButtonState(button, loading) {
isLoading = loading
if (loading) {
button.textContent = 'Loading...'
button.style.backgroundColor = '#6c757d'
button.style.cursor = 'not-allowed'
button.style.transform = 'translateY(0)'
button.disabled = true
} else {
button.textContent = 'Load More'
button.style.backgroundColor = '#007bff'
button.style.cursor = 'pointer'
button.disabled = false
}
}
/**
* Handle the load more button click event
* @param {HTMLElement} sentinel - The load more sentinel element
* @param {HTMLButtonElement} button - The button element
*/
function handleLoadMore(sentinel, button) {
if (isLoading) {
debugLog('Already loading, ignoring click')
return
}
debugLog('Load more button clicked')
updateButtonState(button, true)
try {
// Show the sentinel to trigger loading
sentinel.style.display = 'block'
// Hide the sentinel after timeout and reset button state
setTimeout(() => {
sentinel.style.display = 'none'
updateButtonState(button, false)
debugLog('Load more completed')
}, CONFIG.LOAD_TIMEOUT)
} catch (error) {
debugLog('Error during load more:', error)
updateButtonState(button, false)
}
}
/**
* Insert the button in the appropriate position relative to the sentinel
* @param {HTMLElement} sentinel - The load more sentinel element
* @param {HTMLButtonElement} button - The button element to insert
*/
function insertButton(sentinel, button) {
try {
const parent = sentinel.parentNode
if (!parent) {
debugLog('Sentinel has no parent node')
return false
}
if (sentinel.nextSibling) {
parent.insertBefore(button, sentinel.nextSibling)
} else {
parent.appendChild(button)
}
debugLog('Button inserted successfully')
return true
} catch (error) {
debugLog('Error inserting button:', error)
return false
}
}
/**
* Initialize the load more functionality
*/
function initLoadMore() {
try {
const sentinel = document.querySelector(CONFIG.SENTINEL_SELECTOR)
if (!sentinel) {
debugLog('Load more sentinel not found')
return
}
// Hide the sentinel by default
sentinel.style.display = 'none'
// Check if button already exists
const existingButton = document.querySelector(`#${CONFIG.BUTTON_ID}`)
if (existingButton) {
debugLog('Button already exists')
return
}
// Create and configure the button
const button = createLoadMoreButton()
button.addEventListener('click', () => handleLoadMore(sentinel, button))
// Insert the button
if (insertButton(sentinel, button)) {
debugLog('Load more functionality initialized')
}
} catch (error) {
debugLog('Error initializing load more:', error)
}
}
/**
* Check if the mutation should trigger an update
* @param {NodeList} addedNodes - The added nodes from mutation
* @returns {boolean} Whether an update should be triggered
*/
function shouldUpdateOnMutation(addedNodes) {
if (!addedNodes || addedNodes.length === 0) {
return false
}
// Check if any added node contains the sentinel or is the sentinel itself
for (const node of addedNodes) {
if (node.nodeType === Node.ELEMENT_NODE) {
if (node.matches && node.matches(CONFIG.SENTINEL_SELECTOR)) {
return true
}
if (
node.querySelector &&
node.querySelector(CONFIG.SENTINEL_SELECTOR)
) {
return true
}
}
}
return false
}
// Initialize mutation observer to watch for DOM changes
const observer = new MutationObserver((mutationsList) => {
let shouldUpdate = false
for (const mutation of mutationsList) {
if (shouldUpdateOnMutation(mutation.addedNodes)) {
shouldUpdate = true
break
}
}
if (shouldUpdate) {
debugLog('DOM mutation detected, reinitializing')
setTimeout(initLoadMore, CONFIG.OBSERVER_DELAY)
}
})
// Start observing DOM changes
observer.observe(document, {
childList: true,
subtree: true,
})
// Initialize on page load
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', initLoadMore)
} else {
initLoadMore()
}
debugLog('Script initialized')
})()
