Reactive meta tags, JavaScript and CSSs

Change meta tags on the fly within flow-router-extra. This package can create meta tags, script and link tags as well.

Features:

• 100% tests coverage;
• Per route, per group, and default (all routes) meta tags;
• Per route, per group, and default (all routes) scripts;
• Per route, per group, and default (all routes) link, like CSS files.

Various ways to set meta, script and link tags, ordered by prioritization:

• FlowRouter.route() [overrides all below]
• FlowRouter.group()
• FlowRouter.globals
• Head template <meta/>, <link/>, <script/> tags [might be overridden by any above]

Note: this package implies ostrio:flow-router-title package.

ToC:

• Installation
• Demo application
• Set CSS and JS per route
• Set application/ld+json
• Use function as value
• Use function's context
• Bootstrap configuration
• Other examples
• Support this project

Install:

meteor add ostrio:flow-router-meta

Demos / Tests:

• Demo source
• Tests

ES6 Import:

1import { FlowRouterMeta } from 'meteor/ostrio:flow-router-meta';
2// This library implies ostrio:flow-router-title package, and both can be imported in single line:
3import { FlowRouterMeta, FlowRouterTitle } from 'meteor/ostrio:flow-router-meta';

Related Packages:

• flow-router-title - Change document.title on the fly within FlowRouter-Extra
• flow-router-extra - Carefully extended FlowRouter

Usage:

You need to initialize FlowRouterMeta and FlowRouterTitle classes by passing FlowRouter object. Right after creating all your routes:

1FlowRouter.route('/', {
2  action() { /* ... */ },
3  title: "Title"
4  /* ... */
5});
6
7new FlowRouterMeta(FlowRouter);
8new FlowRouterTitle(FlowRouter);

Set CSS and JS per route:

1// Set default JS and CSS for all routes
2FlowRouter.globals.push({
3  link: {
4    twbs: {
5      rel: 'stylesheet',
6      href: 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css'
7    }
8  },
9  script: {
10    twbs: 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js'
11  }
12});
13
14// Rewrite default JS and CSS, for second route, via controller:
15FlowRouter.route('/secondPage', {
16  name: 'secondPage',
17  action(params, query) {
18    return this.render('layout', 'secondPage');
19  },
20  link: {
21    twbs: {
22      rel: 'stylesheet',
23      href: 'https://maxcdn.bootstrapcdn.com/bootstrap/2.2.0/css/bootstrap.min.css'
24    }
25  },
26  script: {
27    twbs: 'https://maxcdn.bootstrapcdn.com/bootstrap/2.2.0/js/bootstrap.min.js'
28  }
29});
30
31// Unset defaults, via controller:
32FlowRouter.route('/secondPage', {
33  name: 'secondPage',
34  action(params, query) {
35    return this.render('layout', 'secondPage');
36  },
37  link: {
38    twbs: null
39  },
40  script: {
41    twbs: null
42  }
43});
44
45// Rewrite default JS and CSS, for route group:
46const group = FlowRouter.group({
47  link: {
48    twbs: {
49      rel: 'stylesheet',
50      href: 'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha/css/bootstrap.min.css'
51    }
52  },
53  script: {
54    twbs: 'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha/js/bootstrap.min.js'
55  }
56});
57
58group.route('/groupPage1', {
59  name: 'groupPage1',
60  action(params, query) {
61    return this.render('layout', 'groupPage1');
62  }
63});

ldjson:

This method uses special property named innerHTML which set script's content instead of attribute. This method and property can be used in the any other case when you need to set script's contents.

1FlowRouter.route('/fourthPage', {
2  name: 'fourthPage',
3  title: 'Fourth Page title',
4  script: {
5    ldjson: {
6      type: 'application/ld+json',
7      innerHTML: JSON.stringify({
8        "@context": "http://schema.org/",
9        "@type": "Recipe",
10        "name": "Grandma's Holiday Apple Pie",
11        "author": "Elaine Smith",
12        "image": "http://images.edge-generalmills.com/56459281-6fe6-4d9d-984f-385c9488d824.jpg",
13        "description": "A classic apple pie.",
14        "aggregateRating": {
15          "@type": "AggregateRating",
16          "ratingValue": "4",
17          "reviewCount": "276",
18          "bestRating": "5",
19          "worstRating": "1"
20        }
21      })
22    }
23  },
24  action() { /*...*/ }
25});

Use function as value:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  meta: {
4    url: {
5      property: 'og:url',
6      itemprop: 'url',
7      content() {
8        return document.location.href;
9      }
10    }
11  },
12  link: {
13    canonical() {
14      return document.location.href;
15    }
16  }
17});

Use function context:

Read about data hook.

1FlowRouter.route('/post/:_id', {
2  name: 'post',
3  waitOn(params) {
4    return [Meteor.subscribe('post', params._id)];
5  },
6  data(params) {
7    return Collection.Posts.findOne(params._id);
8  },
9  meta: {
10    keywords: {
11      name: 'keywords',
12      itemprop: 'keywords',
13      content(params, query, data) {
14        if (data == null) {
15          data = {};
16        }
17        return data.keywords;
18      }
19    }
20  },
21  title(params, query, data) {
22    if (data == null) {
23      data = {};
24    }
25    if (data) {
26      return data.title;
27    } else {
28      return '404: Page not found';
29    }
30  }
31});

Other examples:

Set only name and content attributes on meta tag:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  meta: {
4    name: 'content'
5  }
6});

Set only rel and href attributes on link tag:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  link: {
4    rel: 'http://example.com'
5  }
6});

Set multiple attributes on meta tag:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  meta: {
4    uniqueName: {
5      name: 'name',
6      content: 'value',
7      property: 'og:name',
8      itemprop: 'name'
9    }
10  }
11});

Set multiple attributes on link tag:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  link: {
4    uniqueName: {
5      rel: 'name',
6      sizes: 'value',
7      href: 'value',
8      type: 'value'
9    }
10  }
11});

Bootstrap configuration:

1FlowRouter.route('/routePath', {
2  name: 'routeName',
3  meta: {
4    // <meta charset="UTF-8">
5    charset: {
6      charset: 'UTF-8'
7    },
8
9    // <meta name="keywords" content="Awes..">
10    keywords: {
11      name: 'keywords',
12      itemprop: 'keywords',
13      content: 'Awesome, Meteor, based, app'
14    },
15
16    // <meta name="description" itemprop="description" property="og:description" content="Default desc..">
17    description: {
18      name: 'description',
19      itemprop: 'description',
20      property: 'og:description',
21      content: 'Default description'
22    },
23    image: {
24      name: 'twitter:image',
25      itemprop: 'image',
26      property: 'og:image',
27      content: 'http://example.com'
28    },
29    'og:type': 'website',
30    'og:title'() {
31      return document.title;
32    },
33    'og:site_name': 'My Awesome Site',
34    url: {
35      property: 'og:url',
36      itemprop: 'url',
37      content() {
38        return window.location.href;
39      }
40    },
41    'twitter:card': 'summary',
42    'twitter:title'() {
43      return document.title;
44    },
45    'twitter:description': 'Default description',
46    'twitter:site': {
47      name: 'twitter:site',
48      value: '@twitterAccountName'
49    },
50    'twitter:creator': {
51      name: 'twitter:creator',
52      value: '@twitterAccountName'
53    },
54    'http-equiv': {
55      'http-equiv': 'X-UA-Compatible',
56      content: 'IE=edge,chrome=1'
57    },
58    robots: 'index, follow',
59    google: 'notranslate'
60  },
61  link: {
62    // <link href="https://maxcdn.bootstrapcdn.com/..." rel="stylesheet">
63    stylesheet: "https://maxcdn.bootstrapcdn.com/bootstrap/2.3.2/css/bootstrap.min.css",
64
65    // <link rel="canonical" href="http://example.com">
66    canonical() {
67      return document.location.href;
68    },
69
70    // <link rel="image" sizes="500x500" href="http://example.com">
71    image: {
72      rel: 'image',
73      sizes: '500x500',
74      href: 'http://example.com'
75    },
76    publisher: 'http://plus.google...',
77    'shortcut icon': {
78      rel: 'shortcut icon',
79      type: 'image/x-icon',
80      href: 'http://example.com'
81    },
82    'icon': {
83      rel: 'icon',
84      type: 'image/png',
85      href: 'http://example.com'
86    },
87    'apple-touch-icon-144': {
88      rel: 'apple-touch-icon',
89      sizes: '144x144',
90      href: 'http://example.com'
91    },
92    'apple-touch-icon-114': {
93      rel: 'apple-touch-icon',
94      sizes: '114x114',
95      href: 'http://example.com'
96    },
97    'apple-touch-icon-72': {
98      rel: 'apple-touch-icon',
99      sizes: '72x72',
100      href: 'http://example.com'
101    },
102    'apple-touch-icon-57': {
103      rel: 'apple-touch-icon',
104      sizes: '57x57',
105      href: 'http://example.com'
106    }
107  },
108  script: {
109    twbs: 'https://maxcdn.bootstrapcdn.com/bootstrap/2.3.2/js/bootstrap.min.js',
110    d3: {
111      src: 'https://d3js.org/d3.v3.min.js',
112      charset: 'utf-8'
113    }
114  }
115});

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