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codemirror-elements
Advanced tools
Readme
A set of HTML custom elements for editing source code with CodeMirror.
codemirror-elements can be used anywhere HTML can:
npm i codemirror-elements
HTML:
<script type="module" src="./node_modules/codemirror-elements/index.js"></script>
JavaScript:
import 'codemirror-elements';
<cm-editor>
elementHTML:
<cm-editor></cm-editor>
Lit:
html`<cm-editor></cm-editor>`
HTML:
<cm-editor value="console.log('Hello');"></cm-editor>
JavaScript:
const editor = document.querySelector('cm-editor');
editor.value = "console.log('Hello');";
JavaScript:
const editor = document.querySelector('cm-editor');
editor.addEventListener('codemirror-document-change', (e) => {
const newValue = e.target.value;
})
Extensions are also HTML elements that you add as children of <cm-editor>
:
HTML:
<script type="module" src="./node_modules/codemirror-elements/lib/cm-lang-javascript.js"></script>
<script type="module" src="./node_modules/codemirror-elements/lib/cm-theme-one-dark.js"></script>
<cm-editor>
<cm-lang-javascript typescript></cm-lang-javascript>
<cm-theme-one-dark></cm-theme-one-dark>
</cm-editor>
This package implements a few CodeMirror extsions as elements:
<cm-lang-javascript>
<cm-lang-html>
<cm-lang-css>
<cm-theme-one-dark>
The intention is to add more, either in this package, or as independently installable packages.
import {customElement} from 'lit/decorators.js';
import {CodeMirrorExtensionElement} from 'codemirror-elements/lib/cm-extention-element.js';
import {someExtension} from 'some-codemirror-extension';
@customElement('cm-lang-css')
export class CodeMirrorLangJavascript extends CodeMirrorExtensionElement {
constructor() {
super();
this.setExtensions([someExtension()]);
}
}
Extensions can also by dynamically update with CodeMirrorExtensionElement.addExtensions()
and CodeMirrorExtensionElement.removeExtensions()
. This can be used to reconfigure extensions based on element properties.
See the <cm-lang-javascript>
element for an example:
import {type PropertyValues} from 'lit';
import {customElement, property} from 'lit/decorators.js';
import {javascript} from '@codemirror/lang-javascript';
import {CodeMirrorExtensionElement} from './cm-extention-element.js';
@customElement('cm-lang-javascript')
export class CodeMirrorLangJavascript extends CodeMirrorExtensionElement {
@property({type: Boolean})
jsx = false;
@property({type: Boolean})
typescript = false;
override update(changedProperties: PropertyValues<this>) {
if (changedProperties.has('jsx') || changedProperties.has('typescript')) {
this.setExtensions([
javascript({jsx: this.jsx, typescript: this.typescript}),
]);
}
super.update(changedProperties);
}
}
This is a small side-project of mine. If you can make use of these elements and need some features or bug fixes, please reach out and hopefully we can collaborate!
FAQs
A set of CodeMirror custom HTML elements
The npm package codemirror-elements receives a total of 1 weekly downloads. As such, codemirror-elements popularity was classified as not popular.
We found that codemirror-elements demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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