@jnields/vue-helmet

v3.0.0

Published

2 years ago

A document head manager for Vue

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jnields

vue-helmet vue document head title meta link script base noscript style

Vue Helmet

Vue-based head manage solution inspired by react-helmet.

Install

This package requires a Promise polyfill to be provided in environments that don't support them natively, and vue@^2.2.1

npm i -S @jnields/vue-helmet

example

<template>
    <helmet-provider>
        <div>
            <helmet>
                <meta charSet="utf-8" />
                <title>My Title</title>
                <link rel="canonical" href="http://mysite.com/example" />
            </helmet>
        </div>
    </helmet-provider>
</template>
<script>
import { Helmet } from "@jnields/vue-helmet";

export default {
  name: 'app',
  components: { HelmetProvider, Helmet },
};
</script>

Nested or latter components will override duplicate changes:

<template>
    <Parent>
        <Helmet>
            <title>My Title</title>
            <meta name="description" content="Helmet application" />
        </Helmet>

        <Child>
            <Helmet>
                <title>Nested Title</title>
                <meta name="description" content="Nested component" />
            </Helmet>
        </Child>
    </Parent>
</template>

outputs:

<head>
    <title>Nested Title</title>
    <meta name="description" content="Nested component">
</head>

See below for a full reference guide.

Features

Supports all valid head tags: title, base, meta, link, script, noscript, and style tags.
Supports attributes for body, html and title tags.
Supports server-side rendering.
Nested components override duplicate head changes.
Duplicate head changes are preserved when specified in the same component (support for tags like "apple-touch-icon").
Callback for tracking DOM changes.

Server usage

HelmetProvider takes an optional context prop, of type Object, that writes to state. You can access rendered tags on the server via context.state.link, etc.

Assuming App passes its context prop along to HelmetProvider (as above), your server would look like this:

// server
import { createRenderer } from 'vue-server-renderer';

const renderer = createRenderer();

app.use(async (req, res, next) => {
  try {
    const context = {};
    const markup = await renderer.renderToString(new App({
      propsData: { context }
    }));
    const helmet = context.state;
    const html = `
      <!doctype html>
      <html ${helmet.htmlAttributes}>
        <head>
          ${helmet.base}
          ${helmet.link}
          ${helmet.meta}
          ${helmet.noscript}
          ${helmet.script}
          ${helmet.style}
          ${helmet.title}
        </head>
        <body ${helmet.bodyAttributes}>
          <div id="root">
            ${markup}
          </div>
        </body>
      </html>
    `;
    res.end(html);
  } catch (e) {
    next(e);
  }
});

Reference Guide

<helmet
    {/*
        (optional) used as a fallback when a template exists but a title is not defined

        <helmet
            defaultTitle="My Site"
            titleTemplate="My Site - %s"
        />

        outputs:

        <head>
            <title>My Site</title>
        </head>
    */}
    defaultTitle="My Default Title"

    {/* (optional) callback that tracks DOM changes */}
    onChangeClientState={(newState, addedTags, removedTags) => console.log(newState, addedTags, removedTags)}
>
    {/* html attributes */}
    <html lang="en" amp />

    {/* body attributes */}
    <body className="root" />

    {/* title attributes and value */}
    <title itemProp="name" lang="en">My Plain Title or {`dynamic`} title</title>

    {/* base element */}
    <base target="_blank" href="http://mysite.com/" />

    {/* multiple meta elements */}
    <meta name="description" content="Helmet application" />
    <meta property="og:type" content="article" />

    {/* multiple link elements */}
    <link rel="canonical" href="http://mysite.com/example" />
    <link rel="apple-touch-icon" href="http://mysite.com/img/apple-touch-icon-57x57.png" />
    <link rel="apple-touch-icon" sizes="72x72" href="http://mysite.com/img/apple-touch-icon-72x72.png" />
    {locales.map((locale) => {
        <link rel="alternate" href="http://example.com/{locale}" hrefLang={locale} />
    })}

    {/* multiple script elements */}
    <script src="http://include.com/pathtojs.js" type="text/javascript" />

    {/* inline script elements */}
    <script type="application/ld+json">{
      JSON.stringify({
        "@context": "http://schema.org"
      })
    }</script>

    {/* noscript elements */}
    <noscript>{`
        <link rel="stylesheet" type="text/css" href="foo.css" />
    `}</noscript>

    {/* inline style elements */}
    <style type="text/css">{`
        body {
            background-color: blue;
        }

        p {
            font-size: 12px;
        }
    `}</style>
</helmet>

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