Press Ctrl+E to get developer-friendly CSS selectors for any element
当前为
// ==UserScript==
// @name Element Selector Tool
// @namespace http://tampermonkey.net/
// @version 6.1
// @description Press Ctrl+E to get developer-friendly CSS selectors for any element
// @author jamubc
// @match *://*/*
// @grant none
// @require https://cdn.jsdelivr.net/npm/@violentmonkey/shortcut@1
// @run-at document-start
// @license Apache 2.0
// ==/UserScript==
(function() {
'use strict';
let active = false, overlay, tooltip, current;
let initialized = false;
function getSelector(el) {
// Priority 1: ID (most reliable)
if (el.id) return `#${el.id}`;
// Priority 2: Data attributes (often used for testing/automation)
const dataAttrs = Array.from(el.attributes).filter(a => a.name.startsWith('data-'));
if (dataAttrs.length) {
const key = dataAttrs.find(a => a.name.includes('test') || a.name.includes('id') || a.name.includes('name')) || dataAttrs[0];
return `[${key.name}="${key.value}"]`;
}
// Priority 3: Unique class combination
if (el.className && typeof el.className === 'string') {
const classes = el.className.trim().split(/\s+/).filter(c => c && !c.match(/^(active|hover|focus|disabled)$/));
if (classes.length) {
const selector = `${el.tagName.toLowerCase()}.${classes.join('.')}`;
// Check if selector is unique
if (document.querySelectorAll(selector).length === 1) return selector;
}
}
// Priority 4: Role or aria-label
if (el.getAttribute('role')) return `[role="${el.getAttribute('role')}"]`;
if (el.getAttribute('aria-label')) return `[aria-label="${el.getAttribute('aria-label')}"]`;
// Priority 5: For common elements, use semantic approach
const tag = el.tagName.toLowerCase();
if (['button', 'input', 'select', 'textarea'].includes(tag)) {
if (el.name) return `${tag}[name="${el.name}"]`;
if (el.type) return `${tag}[type="${el.type}"]`;
}
// Last resort: Minimal path from nearest ID
let path = [];
let current = el;
while (current && current !== document.body) {
let selector = current.tagName.toLowerCase();
if (current.id) {
path.unshift(`#${current.id}`);
break;
}
const parent = current.parentElement;
if (parent) {
const index = Array.from(parent.children).indexOf(current) + 1;
selector += `:nth-child(${index})`;
}
path.unshift(selector);
current = parent;
}
return path.join(' > ');
}
function highlight(el) {
const rect = el.getBoundingClientRect();
const selector = getSelector(el);
// Thin precise border
overlay.style.cssText = `position:fixed;left:${rect.left}px;top:${rect.top}px;width:${rect.width}px;height:${rect.height}px;background:transparent;border:1px solid #0088ff;pointer-events:none;z-index:2147483647;display:block;box-sizing:border-box;outline:1px solid rgba(255,255,255,0.5);outline-offset:-2px`;
// Build enhanced tree view
let content = selector;
// Always build tree view to show element hierarchy with attributes
const buildTree = () => {
const elements = [];
let curr = el;
// Collect elements up to root or nearest ID
while (curr && curr !== document.body) {
const attrs = [];
// Build comprehensive element description
const tag = curr.tagName.toLowerCase();
const parts = [];
// Always start with tag
parts.push(`<span style="color:#6db3f2">${tag}</span>`);
// Add ID if present
if (curr.id) {
parts.push(`<span style="color:#86c1b9">#${curr.id}</span>`);
}
// Add classes (first 2-3 meaningful ones)
if (curr.className && typeof curr.className === 'string') {
const classes = curr.className.trim().split(/\s+/)
.filter(c => c && !c.match(/^(active|hover|focus|disabled|selected|open|closed|ng-|css-)/))
.slice(0, 2);
if (classes.length > 0) {
parts.push(`<span style="color:#f0c674">.${classes.join('.')}</span>`);
}
}
// Add key attributes
if (curr.getAttribute('role')) {
parts.push(`<span style="color:#cc99cc">[role=${curr.getAttribute('role')}]</span>`);
}
// Show actual data attributes
const dataAttrs = Array.from(curr.attributes)
.filter(attr => attr.name.startsWith('data-'))
.slice(0, 2); // Show first 2 data attributes
dataAttrs.forEach(attr => {
let value = attr.value;
if (value.length > 12) value = value.substring(0, 10) + '..';
parts.push(`<span style="color:#cc99cc">[${attr.name}="${value}"]</span>`);
});
// Add text content for leaf nodes
if (curr.textContent && curr.textContent.trim() && curr.children.length === 0) {
const text = curr.textContent.trim().substring(0, 15);
parts.push(`<span style="color:#b19cd9">"${text}${curr.textContent.trim().length > 15 ? '...' : ''}"</span>`);
}
attrs.push(parts.join(' '));
elements.unshift({
tag: curr.tagName.toLowerCase(),
attrs: attrs,
element: curr
});
if (curr.id) break; // Stop at ID
curr = curr.parentElement;
}
// Build tree display with proper tree characters
return elements.map((item, i) => {
const isTarget = i === elements.length - 1;
const isRoot = i === 0;
let line = '';
// Build indent with vertical lines
for (let j = 0; j < i; j++) {
line += j < i - 1 ? '│ ' : '';
}
// Add connector
if (!isRoot) {
line += isTarget ? '└─ ' : '├─ ';
}
let display = item.attrs.join(' ') || item.tag;
// Highlight target with better visual distinction
if (isTarget) {
return `<span style="color:#666">${line}</span><span style="background:rgba(0,255,255,0.1);padding:1px 3px;border-radius:2px">${display}</span>`;
}
return `<span style="color:#666">${line}</span>${display}`;
}).join('\n');
};
const tree = buildTree();
// Truncate selector for display
const displaySelector = selector.length > 60 ? selector.substring(0, 57) + '...' : selector;
// Remove text preview - already shown in tree
// Only show the selector if it's different from the last item in tree
const lastTreeItem = tree.split('\n').pop();
const lastTreeText = lastTreeItem.replace(/<[^>]*>/g, '').trim();
const selectorDisplay = lastTreeText.includes(selector) || selector === lastTreeText.replace(/[└─\s]/g, '')
? ''
: `\n<div style="margin-top:8px;padding-top:8px;border-top:1px solid #444"><div style="font-size:11px;color:#0ff">${displaySelector}</div></div>`;
content = `${tree}${selectorDisplay}`;
tooltip.innerHTML = content;
tooltip.style.cssText = 'position:fixed;background:#000;color:#fff;padding:10px 12px;font:11px monospace;border-radius:4px;pointer-events:none;z-index:2147483647;display:block;max-width:500px;box-shadow:0 2px 8px rgba(0,0,0,0.4);line-height:1.5;white-space:pre-wrap';
// Calculate tooltip dimensions after styling
const tooltipRect = tooltip.getBoundingClientRect();
const gap = 5;
// Find best position (priority: top, bottom, right, left)
let pos = null;
// Try above
if (rect.top - tooltipRect.height - gap > 0) {
pos = {
left: Math.min(Math.max(rect.left, gap), window.innerWidth - tooltipRect.width - gap),
top: rect.top - tooltipRect.height - gap
};
}
// Try below
else if (rect.bottom + tooltipRect.height + gap < window.innerHeight) {
pos = {
left: Math.min(Math.max(rect.left, gap), window.innerWidth - tooltipRect.width - gap),
top: rect.bottom + gap
};
}
// Try right
else if (rect.right + tooltipRect.width + gap < window.innerWidth) {
pos = {
left: rect.right + gap,
top: Math.min(Math.max(rect.top, gap), window.innerHeight - tooltipRect.height - gap)
};
}
// Try left
else if (rect.left - tooltipRect.width - gap > 0) {
pos = {
left: rect.left - tooltipRect.width - gap,
top: Math.min(Math.max(rect.top, gap), window.innerHeight - tooltipRect.height - gap)
};
}
// Fallback: top-right corner of viewport
else {
pos = {
left: window.innerWidth - tooltipRect.width - 20,
top: 20
};
}
tooltip.style.left = pos.left + 'px';
tooltip.style.top = pos.top + 'px';
}
function toggle() {
active = !active;
document.body.style.cursor = active ? 'crosshair' : '';
if (!active) {
overlay.style.display = 'none';
tooltip.style.display = 'none';
}
const notif = document.createElement('div');
notif.textContent = active ? 'Selector mode ON (Press Escape to exit)' : 'Selector mode OFF';
notif.style.cssText = 'position:fixed;top:20px;right:20px;background:#4CAF50;color:white;padding:10px 15px;border-radius:4px;z-index:2147483647;font-family:Arial';
document.body.appendChild(notif);
setTimeout(() => notif.remove(), 2000);
}
// Initialize function
function init() {
if (initialized) return;
initialized = true;
// Create elements
overlay = document.createElement('div');
tooltip = document.createElement('div');
overlay.style.display = 'none';
tooltip.style.display = 'none';
document.body.append(overlay, tooltip);
// Register shortcuts
if (typeof VM !== 'undefined' && VM.shortcut) {
VM.shortcut.register('c-e', toggle);
VM.shortcut.register('escape', () => {
if (active) {
toggle();
}
});
}
// Event listeners
document.addEventListener('mouseover', e => {
if (active && e.target !== overlay && e.target !== tooltip) {
current = e.target;
highlight(e.target);
}
});
// Update position on scroll
document.addEventListener('scroll', () => {
if (active && current) {
highlight(current);
}
}, true);
// Update on window resize
window.addEventListener('resize', () => {
if (active && current) {
highlight(current);
}
});
document.addEventListener('click', e => {
if (active && current) {
e.preventDefault();
e.stopPropagation();
const selector = getSelector(current);
navigator.clipboard?.writeText(selector).then(() => {
const notif = document.createElement('div');
notif.textContent = 'Copied: ' + selector;
notif.style.cssText = 'position:fixed;top:20px;right:20px;background:#4CAF50;color:white;padding:10px 15px;border-radius:4px;z-index:2147483647;font-family:Arial';
document.body.appendChild(notif);
setTimeout(() => notif.remove(), 2000);
});
}
});
}
// Initialize when DOM is ready
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
// DOM already loaded, initialize immediately
init();
}
// Also reinitialize on navigation changes for SPAs
let lastUrl = location.href;
new MutationObserver(() => {
const url = location.href;
if (url !== lastUrl) {
lastUrl = url;
// Give the page time to render
setTimeout(() => {
if (!initialized || !document.body.contains(overlay)) {
initialized = false;
init();
}
}, 500);
}
}).observe(document, {subtree: true, childList: true});
// Handle history navigation
window.addEventListener('popstate', () => {
setTimeout(() => {
if (!initialized || !document.body.contains(overlay)) {
initialized = false;
init();
}
}, 500);
});
})();