buildoz is born, bz-select is coming

buildoz.css

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+bz-select {
+    display: block;
+    margin: .5rem 0 .5rem 0;
+}
+bz-select > button{
+    width:100%;
+    text-align: left;
+    font-family: sans;
+    font-size: .9rem;
+    border-radius: 1rem;
+    border: none;
+    padding: 0.2rem .2rem .3rem .5rem;
+    background: linear-gradient( to bottom, #555, #aaa 15%, #ccc 50%, #aaa 85%, #555 );
+}
+bz-select > button::after {
+    content: "\00BB";
+    transform: rotate(90deg) translateX(-0.4rem);
+    position: absolute;
+    right: 1.5rem;
+    pointer-events: none;
+    font-size: 1.5rem;
+    color: #444;
+}    
+
+bz-select option{
+    background-color: #DDD;
+    color: #000;
+    padding: 0.2rem .2rem .3rem .5rem;
+    margin: -1rem 0 0 0;
+    border-radius: 1rem;
+    height: 1rem;
+    font-family: sans;
+    font-size: .9rem;
+    opacity: 0;
+    transition:
+        margin-top 0.3s ease,
+        opacity 0.3s ease;
+}
+bz-select option.open{
+    margin: 2px 0 0 0;
+    opacity: 1;
+}
+bz-select option:hover{
+    background-color: #44F;
+    color: #FFF;
+}

buildoz.js

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+
+
+class Buildoz extends HTMLElement {
+    constructor(){
+        super()              // always call super() first!
+        this.attrs = {}
+    }
+        
+    static get observedAttributes(){ //observable  attributes triggering attributeChangedCallback
+        // anything added here will be observed for all buildoz tags
+        // in your child, add you local 'color' observable attr with :
+        // return([...super.observedAttributes, 'color'])
+        return([]) 
+    }
+
+    static define(name, cls){
+        const tag = `bz-${name}`
+        if(!customElements.get(tag)) { // no wild redefinition
+            customElements.define(tag, cls)
+        }
+        return cls
+    }
+    
+    connectedCallback(){ // added to the DOM
+        this.classList.add('buildoz')
+    }
+    
+    disconnectedCallback(){ // removed from the DOM
+
+    }  
+    
+    attributeChangedCallback(name, oldValue, newValue) {
+        this.attr[name] = newValue
+        //console.log(`attr ${name} changed from ${oldValue} to ${newValue}`)
+    }
+
+}
+
+class BZselect extends Buildoz {
+    constructor(){
+        super()
+
+        this.open = false
+        //defaults, can be changed by corresponding attributes
+        this.attrs = {
+            size: 0,
+            label: 'Select...',
+        }
+    }
+
+    connectedCallback() {
+        super.connectedCallback()
+
+        this.button = document.createElement('button')
+        this.button.textContent =  this.attrs.label
+        this.prepend(this.button)
+        this.button.addEventListener('click', this.toggle.bind(this))
+
+        this.options = this.querySelectorAll('option')
+        // let toShow = this.attrs.size
+        // for(const opt of this.options){
+        //     if(toShow>0){
+        //         opt.style.display = 'block'
+        //     } else {
+        //         opt.style.display = 'none'
+        //     }
+        //     toShow--
+        // }
+    }
+    
+    static get observedAttributes(){
+        return [...super.observedAttributes, 'label', 'size']
+    }
+
+    attributeChangedCallback(name, oldValue, newValue) {
+        super.connectedCallback()
+        // on the fly changes here
+    }
+
+    toggle(evt){
+        for(const opt of this.options){
+            if(this.open) opt.classList.remove('open')
+            else opt.classList.add('open')
+        }
+        this.open = !this.open
+    }
+
+    fill(opts){
+        this.el.innerHTML =''
+        if(!Array.isArray(opts)) opts = [opts]
+        const ul = Object.assign(document.createElement('ul'), 
+        { className: `bz-selector ${this.config.ulClass ? this.config.ulClass :''}`,
+        })
+        for(const opt of opts){
+            const li = document.createElement('li')
+            li.innerHTML = `${opt.markup}`
+            li.setAttribute('data-value', opt.value)
+            ul.append(li)
+        }
+        this.el.append(ul)
+    }
+}
+
+Buildoz.define('select', BZselect)