class UioKey extends HTMLElement {  ...  eKey(){windows.alert('class  eKey function')}      }    function eKey(){  eKey(){windows.alert('document eKey function')} <template id="uio-key-temp">     <div class="uio...
I am building vanilla web components for educational purposes. Here is my custom checkbox.  class Checkbox extends HTMLElement {     constructor() {         super();         this.shadow = this.attachShadow({mode:'open'});         this.shadow....
I need to find a very performant way to find out if a custom element or any of its parent elements has display: none;  First approach:  checkVisible() {   let parentNodes = [];   let el = this;   while (!!(el = el.parentNode)) {     parentNodes.push(...
I have built a native web component called <expanding-textarea> which extends the functionality of <textarea>. I am able to set text content of the component like <expanding-textarea>content goes here</expanding-textarea> but...
Context: until now I didn't mind about how import template html file to my vanilla webcomponent because I always wrote small html codes. So I have coded html on top of my webcomponent .js file and do something like:  const template = document.cre...
I have created this very common scenario of menu links, in a native vanilla JS web-component format.   <side-nav>     <nav-item id="1">1</nav-item>     <nav-item id="2">2</nav-item>     <nav-item id=&#...
I want to create a custom input with the Shadow DOM  class TextBox extends HTMLElement {    constructor() {     super();     var shadow = this.attachShadow({ mode: 'open' });      let textbox = document.createElement("input");     sha...
I have a web component and I want to adjust the value of its slot.   Unfortunately, I am unable to get the resolved value from it.   How can I do that?    const template = document.createElement('template'); template.innerHTML = `     <p&g...
The below code fails with console error Uncaught TypeError: node.setAttribute is not a function. How can I change the attributes of nodes created from templates?  const template = document.createElement("template"); template.innerHTML = `<...
I am trying to create a web component with the following features: 1. click a button to add a <textarea> element. 2. After adding text to newly created <textarea> element, this text is added to the corresponding item of this.list. 3. In a...

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