Question: Dynamic tags about uhtml HOT 4 CLOSED

@thezealousfool maybe you'd be interested in knowing I've finally made it possible to pass arbitrary tag names at runtime:
https://github.com/WebReflection/static-params#readme

your example would work via (CodePen)

import {render, html} from 'uhtml';
import {asStatic, asTag} from 'static-params';

const shtml = asTag(html);
const elements = [
  { tag: asStatic("div"), content: "Hello" },
  { tag: asStatic("h1"), content: "World" }
];

render(
  this.element,
  html`${elements.map((elem) => shtml`<${elem.tag}>${elem.content}</${elem.tag}>`)}`
);

from uhtml.

@Dan-Do the whole poin of projects like uhtml (or lit) is that you never want to manually interfere with the rendered content, but most importantly, Never use innerHTML.

Accordingly, this is probably what you want and, if you need to update that render, you need to put that render inside a callback you can call any time some state changes.

import {render, html} from '//unpkg.com/uhtml?module';
import {asTag} from '//unpkg.com/static-params?module';

const shtml = asTag(html);
const buttonState = {disabled: false, text: 'Click Me'};
const {disabled, text} = buttonState;
const {log} = console;

const views = new Map();
let activeRoute = "/";
views.set('/', `<section route="/" class=${activeRoute == "/" ? "" : "is-hidden"}>Hello! + ${activeRoute == "/" ? "" : "is-hidden"}</section>`);
const loadedViews = ["/"];

render(document.body, html`
  <button class="clickable"
    onclick=${() => log('clicked')}
    ?disabled=${!disabled}
  >
    ${text}
  </button>
  ${loadedViews.includes("/") ? html([views.get("/")]) : html``}
`);

from uhtml.

This is a recurrent question I've had for hyperHTML and lighterhtml too, but the short answer is that it's not possible with non vDOM libraries, simply because it's not possible to update/change a tag name in the wild. The logic behind these libraries is always the same: what operation that hole should result? ... and such operation should be supported by the platform.

You would need a reference per each node that uses such technique too, 'cause you must be able to swap on the fly possible different nodes.

The logic here is very different from SSR template engines, you're not working with strings, you are working with real HTML/SVG declarations, and a node that can be a div and suddenly a p makes no sense, as you can't change tagName on the fly, that's not how the DOM works. You can change attributes and content, never the name/kind of the node, you gotta replace it, and it's complicated (needs references and RAM to store somehow these references, etc).

There are ways to work-around this scenario, but arguably the scenario is not needed in the first place, when you have a properly structured layout.

Using eval is also an option, but one I don't like.

As summary: in 3 years I've never needed this use case and I won't overly complicate the parsing and the runtime cost/performance to support such use case.

If this is vital for your application, I am afraid I suggest you look for something else not standards based.

Thanks for your understanding.

from uhtml.

Hi @WebReflection
Could you help me look at this insert dynamic element using insertAdjacentHTML?
https://codepen.io/ali33yukisakura/pen/PoOPqve?editors=0011

The attribute "class" of this <section route="/" class=${activeRoute == "/" ? "" : "is-hidden"}>Hello!</section> is escaped.

from uhtml.