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 created two web-components and nested one of them into the other. Both of them have its constructor. The problem that I have is that, I have no control on running the sequence of the constructors. Is there any way which I can set this out?  Here...
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=&#...
Lately I am implementing a lightweight vanilla-JS library with HTML web components for in-company usage only.  I have a behavioral issue in JavaScript regarding the resizing of client elements in a parent container.  This is my test-HTML-file to repr...
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...

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