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Change notification helpers for LitElement

npm version

Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.

Install

npm install @morbidick/lit-element-notify

Notify mixin

Small mixin for LitElement to get easy change events via the properties getter.

This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:

  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.

The updated value of the property is available in event.detail.value.

import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}

Sync directive

lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element. The directive takes two parameters, the property name and an optional event name on which to sync.

Usage

import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}

About

Small helpers for LitElement to dispatch change notifications and two-way binding

Topics

lit-elementwebcomponents

Resources

Readme
Activity

Stars

30 stars

Watchers

1 watching

Forks

4 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
Skip to content
BranchesTags
Repository files navigation
Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
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Small helpers for LitElement to dispatch change notifications and two-way binding
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - morbidick/lit-element-notify: Small helpers for LitElement to dispatch change notifications and two-way binding · GitHub
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Change notification helpers for LitElement
npm version
Small helpers for LitElement to dispatch change notifications and two-way binding. For a comparison to PolymerElement and pure LitElement see comparison section in the docs.
Install
npm install @morbidick/lit-element-notify
Notify mixin
Small mixin for LitElement to get easy change events via the properties getter.
This mixin adds the notify option to the property definition. Similar to the LitElement attribute option (which reflects a property to the dom) it fires an event as soon as the property value changes. The event name depends on the following conditions:
  1. notify: true: the property gets lowercased and -changed is appended (note: contrary to PolymerElement and similar to LitElements attribute handling no camelCase to kebap-case conversion is done).
  2. the notify option contains a string: notify: 'success-event' fires an event named success-event.
  3. notify: true is set and the attribute option is a string (attribute: 'attribute-name'): the attribute name will be suffixed with -changed.
The updated value of the property is available in event.detail.value.
import{LitElement,html}from'lit-element';importLitNotifyfrom'@morbidick/lit-element-notify/notify.js';classNotifyingElementextendsLitNotify(LitElement){staticgetproperties(){return{// property names get lowercased and the -changed suffix is addedtoken: {type: String,notify: true,// fires token-changed},camelCase: {type: String,notify: true,// fires camelcase-changed},// an explicit event name can be setthing: {type: String,notify: 'success-event',// fires success-event},// if an attribute value is set, -changed is appendedmyMessage: {type: String,attribute: 'my-message',notify: true,// fires my-message-changed},};}}
Sync directive
lit-html directive to synchronize an element property to a childs property, adding two-way binding to lit-element.
The directive takes two parameters, the property name and an optional event name on which to sync.
Usage
import{LitElement,html}from'lit-element';importLitSyncfrom'@morbidick/lit-element-notify/sync.js';classSyncElementextendsLitSync(LitElement){// Syncing the child property `token` with the parent property `myProperty` when `token-changed`// is fired or `myProperty` set.render(){returnhtml`<notifying-element.token=${this.sync('myProperty')}></notifying-element> `}// Syncing the child property `myMessage` with the event explicitly set to `my-message-changed` // (mainly used to map from the camelCase property to the kebap-case event as PolymerElement does).render(){returnhtml`<notifying-element.myMessage=${this.sync('myProperty','my-message-changed')}></notifying-element> `}}
About
Small helpers for LitElement to dispatch change notifications and two-way binding
Topics
lit-elementwebcomponents
Resources
Readme
Activity
Stars
30 stars
Watchers
1 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages