To use the jsxte you will have to set up your transpiler to use this package for transforming the JSX syntax, if you use typescript for transpiling all you have to do is set these options in the tsconfig:

{
  "compilerOptions": {
    "jsx": "react-jsx",
    "jsxImportSource": "jsxte"
  }
}

If you use something else, like babel you will also need to adapt the configuration of that, for example: https://babeljs.io/docs/en/babel-plugin-transform-react-jsx#with-a-configuration-file-recommended

(See example configurations here).

Once you are done with that you can start writing your templates and rendering them.

import { renderToHtml } from "jsxte";

const Header: JSXTE.Component = (props: { label: string }) => {
  return <h1>{props.label}</h1>;
};

const App: JSXTE.Component = (props: { label: string }) => {
  return (
    <html>
      <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
      </head>
      <body>
        <Header label={props.label} />
      </body>
    </html>
  );
};

const html = renderToHtml(<App label="Hello World!" />);
// OR
const html = renderToHtml(jsx(App, { label: "Hello World!" }));

Asynchronous Components

In case you use the templates in a server app in a Node environment you might want to include some data from the database in the html you serve to the client. To make it easier to fetch what's needed and marry it with the templates you can make your components asynchronous and send async requests from within them.

import { renderToHtmlAsync } from "jsxte";

const Header: JSXTE.Component = () => {
  return <h1>Hello World</h1>;
};

const ToDoList: JSXTE.Component = async () => {
  const todos = await fetchMyTodosFromDB();

  return (
    <table>
      <thead>
        <tr>
          <th>Label</th>
          <th>Is Done?</th>
        </tr>
      </thead>
      <tbody>
        {todos.map((todo) => (
          <tr>
            <td>{todo.label}</td>
            <td>{todo.isDone ? "yes" : "no"}</td>
          </tr>
        ))}
      </tbody>
    </table>
  );
};

const App: JSXTE.Component = () => {
  return (
    <html>
      <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
      </head>
      <body>
        <Header />
        <h3>ToDo's:</h3>
        <ToDoList />
      </body>
    </html>
  );
};

// If your component contains an asynchronous component at any point, `renderToHtmlAsync` needs to be used instead of `renderToHtml`
const html = await renderToHtmlAsync(<App label="Hello World!" />);

Context

Context Map is a interface provided to each functional component that provides a mechanism for providing any arbitrary data to it's descendant. This is primarily to avoid the prop-drilling.

Example

import { defineContext } from "jsxte";

const myContext = defineContext<{ foo: string }>();

const App: JSXTE.Component = (props, contextMap) => {
  // Set the context to a new value, all descendants of this component will have access to it
  contextMap.set(myContext, { foo: "Hello" });

  return <Foo />;
};

const Foo: JSXTE.Component = (props, contextMap) => {
  let label = "";

  // Check if `myContext` is being provided by any of the ancestors
  if (contextMap.has(myContext)) {
    // Retrieve the context data
    label = contextMap.get(myContext).label;
  }

  return <p>{label}</p>;
};

Extending the typings

JSXTE should be able to parse any html attributes you put in, as well as custom web component tags, although you may see type errors if you use anything that is not defined in the library typings. If you wish to use them it is recommended you extend the typings to disable said errors.

Adding custom web component tags

To add a typing for a custom web component simply add a declare block in one of your project .ts or .tsx files, like this one:

declare global {
  namespace JSX {
    interface IntrinsicElements {
      "my-custom-web-component": {
        /* here include the attributes your component can take */
        "data-example-attribute"?: string;
      };
    }
  }
}

// with it it's possible to use this without type errors:
const MyComponent: JSXTE.Component = () => (
  <my-custom-web-component data-example-attribute="Hello"></my-custom-web-component>
);

Adding a global html attribute

There is a dictionary of html attributes that are available for every default html tag, that dictionary can be extended like so:

declare global {
  namespace JSXTE {
    interface BaseHTMLTagProps {
      "new-attribute"?: string;
    }
  }
}

// with it it's possible to use this without type errors:
const MyComponent = () => <div new-attribute="Hello"></div>;

Express JS View Engine

You can also use jsxte with the Express View Engine. To do that, use the expressExtend to add the engine support, specify the views directory and then use the express response method .render(). The .render() method takes the component props as it's second argument.

import express from "express";
import { expressExtend } from "jsxte";

const app = express();
expressExtend(app);

app.set("views", path.resolve(__dirname, "views"));

app.get("/", (_, resp) => {
  const indexProps = {
    /* ... */
  };
  resp.render("index", indexProps); // will render the `index.js` component located in the ./views file
});

For this approach to work, the JSX Components must be exported as defaults (ex. export default () => <div></div> or exports.default = () => <div></div>) and the views must be transpiled to .js files.

Rendering to a string tag template

A string tag template is special type of function that can be used for custom parsing of template literals.

JSXTE allows you to leverage any existing string tag templates but with a JSX syntax instead of a template literal.

Example

// using template literal:
import { html } from "some-library";
const props = {
  /* ... */
};
const result = html`<div class="${props.className}">
  <h1>${props.header}</h1>
</div>`;

// using JSXTE:
import { renderToStringTemplateTag } from "jsxte";
import { html } from "some-library";
const props = {
  /* ... */
};
const result = renderToStringTemplateTag(
  html,
  <div class={props.className}>
    <h1>{props.header}</h1>
  </div>
);

If the string tag template function uses non standard html attribute names (ex. className instead of class or @click instead of onclick) you can map the attribute names render by this method by specifying mapping for those:

const result = renderToStringTemplateTag(
  html,
  <div>
    <button class="my-class" onclick={handler}>
      Click Me
    </button>
  </div>,
  {
    attributeMap: {
      onclick: "@click",
      class: "className",
    },
  }
);

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Last updated on 31 Jul 2022

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