I have created a webcomponent for a generic input boxes that i needed across multiple projects. the design functionality remains same only i have to use switch themes on each projects.so i have decided to go on with webcomponents.One of the projects is based on Vue Js.In Vue js the DOM content is re-rendered while each update for enabling reactivity. That re-rendering of vue template is reinitializing my custom webcomponent which will result in loosing all my configurations i have assigned to the component using setters. I know the below solutions. but i wanted to use a setter method.
using v-show instead of v-if
-- Above three solutions doesn't really match with what i am trying to create.
I have created a sample project in jsfiddle to display my issue. Each time i an unchecking and checking the checkbox new instances of my component is creating. which causes loosing the theme i have selected. (please check he active boxes count) For this particular example i want blue theme to be displayed. but it keep changing to red
class InputBox extends HTMLElement {
constructor() {
super();
window.activeBoxes ? window.activeBoxes++ : window.activeBoxes = 1;
var shadow = this.attachShadow({
mode: 'open'
});
var template = `
<style>
.blue#iElem {
background: #00f !important;
color: #fff !important;
}
.green#iElem {
background: #0f0 !important;
color: #f00 !important;
}
#iElem {
background: #f00;
padding: 13px;
border-radius: 10px;
color: yellow;
border: 0;
outline: 0;
box-shadow: 0px 0px 14px -3px #000;
}
</style>
<input id="iElem" autocomplete="off" autocorrect="off" spellcheck="false" type="text" />
`;
shadow.innerHTML = template;
this._theme = 'red';
this.changeTheme = function(){
this.shadowRoot.querySelector('#iElem').className = '';
this.shadowRoot.querySelector('#iElem').classList.add(this._theme);
}
}
connectedCallback() {
this.changeTheme();
}
set theme(val){
this._theme = val;
this.changeTheme();
}
}
window.customElements.define('search-bar', InputBox);<!DOCTYPE html>
<html>
<head>
<title>Wrapper Component</title>
<script src="https://unpkg.com/vue"></script>
<style>
html,
body {
font: 13px/18px sans-serif;
}
select {
min-width: 300px;
}
search-bar {
top: 100px;
position: absolute;
left: 300px;
}
input {
min-width: 20px;
padding: 25px;
top: 100px;
position: absolute;
}
</style>
</head>
<body>
<div id="el"></div>
<!-- using string template here to work around HTML <option> placement restriction -->
<script type="text/x-template" id="demo-template">
<div>
<div class='parent' contentEditable='true' v-if='visible'>
<search-bar ref='iBox'></search-bar>
</div>
<input type='checkbox' v-model='visible'>
</div>
</script>
<script type="text/x-template" id="select2-template">
<select>
<slot></slot>
</select>
</script>
<script>
var vm = new Vue({
el: "#el",
template: "#demo-template",
data: {
visible: true,
},
mounted(){
let self = this
setTimeout(()=>{
self.$refs.iBox.theme = 'blue';
} , 0)
}
});
</script>
</body>
</html><div class='parent' contentEditable='true' v-if='visible'>
<search-bar ref='iBox'></search-bar>
</div>
<input type='checkbox' v-model='visible'>
Vue's v-if will add/remove the whole DIV from the DOM
So <search-bar> is also added/removed on every checkbox click
If you want a state for <search-bar> you have to save it someplace outside the <search-bar> component:
Or change your checkbox code to not use v-if but hide the <div> with any CSS:
and/or...
You can easily toggle styling using <style> elements:
<style id="SearchBox" onload="this.disabled=true">
... lots of CSS
... even more CSS
... and more CSS
</style>
The onload event makes sure the <style> is not applied on page load.
activate all CSS styles:
(this.shadowRoot || document).getElementById("SearchBox").disabled = false
remove all CSS styles:
(this.shadowRoot || document).getElementById("SearchBox").disabled = true
You do need CSS Properties for this to work in combo with shadowDOM Elements.
I prefer native over Frameworks. <style v-if='visible'/> will work.. by brutally removing/adding the stylesheet.