support custom options

src/client/refresh.js

@@ -1,6 +1,7 @@
 import getMetaInfo from '../shared/getMetaInfo'
 import updateClientMetaInfo from './updateClientMetaInfo'
 
+export default function _refresh (options) {
   /**
    * When called, will update the current meta info with new meta info.
    * Useful when updating meta info as the result of an asynchronous
@@ -11,8 +12,9 @@ import updateClientMetaInfo from './updateClientMetaInfo'
    *
    * @return {Object} - new meta info
    */
-export default function refresh () {
-  const info = getMetaInfo(this.$root)
-  updateClientMetaInfo(info)
+  return function refresh () {
+    const info = getMetaInfo(options)(this.$root)
+    updateClientMetaInfo(options)(info)
     return info
   }
+}

src/client/updateClientMetaInfo.js

@@ -1,17 +1,19 @@
 import updateTitle from './updaters/updateTitle'
 import updateTagAttributes from './updaters/updateTagAttributes'
 import updateTags from './updaters/updateTags'
-import { SERVER_RENDERED_ATTRIBUTE } from '../shared/constants'
+
+export default function _updateClientMetaInfo (options) {
+  const { ssrAttribute } = options
 
   /**
    * Performs client-side updates when new meta info is received
    *
    * @param  {Object} newInfo - the meta info to update to
    */
-export default function updateClientMetaInfo (newInfo) {
+  return function updateClientMetaInfo (newInfo) {
     const htmlTag = document.getElementsByTagName('html')[0]
     // if this is not a server render, then update
-  if (htmlTag.getAttribute(SERVER_RENDERED_ATTRIBUTE) === null) {
+    if (htmlTag.getAttribute(ssrAttribute) === null) {
       // initialize tracked changes
       const addedTags = {}
       const removedTags = {}
@@ -20,12 +22,12 @@ export default function updateClientMetaInfo (newInfo) {
         switch (key) {
           // update the title
           case 'title':
-          updateTitle(newInfo.title)
+            updateTitle(options)(newInfo.title)
             break
           // update attributes
           case 'htmlAttrs':
           case 'bodyAttrs':
-          updateTagAttributes(newInfo[key], key === 'htmlAttrs' ? htmlTag : document.getElementsByTagName('body')[0])
+            updateTagAttributes(options)(newInfo[key], key === 'htmlAttrs' ? htmlTag : document.getElementsByTagName('body')[0])
             break
           // ignore these
           case 'titleChunk':
@@ -34,7 +36,7 @@ export default function updateClientMetaInfo (newInfo) {
             break
           // catch-all update tags
           default:
-          const { oldTags, newTags } = updateTags(key, newInfo[key], document.getElementsByTagName('head')[0])
+            const { oldTags, newTags } = updateTags(options)(key, newInfo[key], document.getElementsByTagName('head')[0])
             if (newTags.length) {
               addedTags[key] = newTags
               removedTags[key] = oldTags
@@ -48,6 +50,7 @@ export default function updateClientMetaInfo (newInfo) {
       }
     } else {
       // remove the server render attribute so we can update on changes
-    htmlTag.removeAttribute(SERVER_RENDERED_ATTRIBUTE)
+      htmlTag.removeAttribute(ssrAttribute)
+    }
   }
 }

src/client/updaters/updateTagAttributes.js

@@ -1,13 +1,12 @@
-import { VUE_META_ATTRIBUTE } from '../../shared/constants'
-
+export default function _updateTagAttributes ({ attribute }) {
   /**
    * updates the document's html tag attributes
    *
    * @param  {Object} attrs - the new document html attributes
    * @param  {HTMLElement} tag - the HTMLElment tag to update with new attrs
    */
-export default function updateTagAttributes (attrs, tag) {
-  const vueMetaAttrString = tag.getAttribute(VUE_META_ATTRIBUTE)
+  return function updateTagAttributes (attrs, tag) {
+    const vueMetaAttrString = tag.getAttribute(attribute)
     const vueMetaAttrs = vueMetaAttrString ? vueMetaAttrString.split(',') : []
     const toRemove = [].concat(vueMetaAttrs)
     for (let attr in attrs) {
@@ -28,8 +27,9 @@ export default function updateTagAttributes (attrs, tag) {
       tag.removeAttribute(toRemove[i])
     }
     if (vueMetaAttrs.length === toRemove.length) {
-    tag.removeAttribute(VUE_META_ATTRIBUTE)
+      tag.removeAttribute(attribute)
     } else {
-    tag.setAttribute(VUE_META_ATTRIBUTE, vueMetaAttrs.join(','))
+      tag.setAttribute(attribute, vueMetaAttrs.join(','))
+    }
   }
 }

src/client/updaters/updateTags.js

@@ -1,8 +1,7 @@
-import { VUE_META_ATTRIBUTE } from '../../shared/constants'
-
 // borrow the slice method
 const toArray = Function.prototype.call.bind(Array.prototype.slice)
 
+export default function _updateTags ({ attribute }) {
   /**
    * Updates meta tags inside <head> on the client. Borrowed from `react-helmet`:
    * https://github.com/nfl/react-helmet/blob/004d448f8de5f823d10f838b02317521180f34da/src/Helmet.js#L195-L245
@@ -11,8 +10,8 @@ const toArray = Function.prototype.call.bind(Array.prototype.slice)
    * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
    * @return {Object} - a representation of what tags changed
    */
-export default function updateTags (type, tags, headTag) {
-  const nodes = headTag.querySelectorAll(`${type}[${VUE_META_ATTRIBUTE}]`)
+  return function updateTags (type, tags, headTag) {
+    const nodes = headTag.querySelectorAll(`${type}[${attribute}]`)
     const oldTags = toArray(nodes)
     const newTags = []
     let indexToDelete
@@ -21,8 +20,8 @@ export default function updateTags (type, tags, headTag) {
       tags.forEach((tag) => {
         const newElement = document.createElement(type)
 
-      for (const attribute in tag) {
-        if (tag.hasOwnProperty(attribute)) {
+        for (const attr in tag) {
+          if (tag.hasOwnProperty(attr)) {
             if (attribute === 'innerHTML') {
               newElement.innerHTML = tag.innerHTML
             } else if (attribute === 'cssText') {
@@ -32,13 +31,13 @@ export default function updateTags (type, tags, headTag) {
                 newElement.appendChild(document.createTextNode(tag.cssText))
               }
             } else {
-            const value = (typeof tag[attribute] === 'undefined') ? '' : tag[attribute]
-            newElement.setAttribute(attribute, value)
+              const value = (typeof tag[attr] === 'undefined') ? '' : tag[attr]
+              newElement.setAttribute(attr, value)
             }
           }
         }
 
-      newElement.setAttribute(VUE_META_ATTRIBUTE, 'true')
+        newElement.setAttribute(attribute, 'true')
 
         // Remove a duplicate tag from domTagstoRemove, so it isn't cleared.
         if (oldTags.some((existingTag, index) => {
@@ -57,3 +56,4 @@ export default function updateTags (type, tags, headTag) {
 
     return { oldTags, newTags }
   }
+}

src/client/updaters/updateTitle.js

@@ -1,8 +1,10 @@
+export default function _updateTitle () {
   /**
    * updates the document title
    *
    * @param  {String} title - the new title of the document
    */
-export default function updateTitle (title = document.title) {
+  return function updateTitle (title = document.title) {
     document.title = title
   }
+}

src/server/generateServerInjector.js

@@ -2,6 +2,7 @@ import titleGenerator from './generators/titleGenerator'
 import attrsGenerator from './generators/attrsGenerator'
 import tagGenerator from './generators/tagGenerator'
 
+export default function _generateServerInjector (options) {
   /**
    * Converts a meta info property to one that can be stringified on the server
    *
@@ -9,14 +10,15 @@ import tagGenerator from './generators/tagGenerator'
    * @param  {(String|Object|Array<Object>)} data - the data value
    * @return {Object} - the new injector
    */
-export default function generateServerInjector (type, data) {
+  return function generateServerInjector (type, data) {
     switch (type) {
       case 'title':
-      return titleGenerator(type, data)
+        return titleGenerator(options)(type, data)
       case 'htmlAttrs':
       case 'bodyAttrs':
-      return attrsGenerator(type, data)
+        return attrsGenerator(options)(type, data)
       default:
-      return tagGenerator(type, data)
+        return tagGenerator(options)(type, data)
+    }
   }
 }

src/server/generators/attrsGenerator.js

@@ -1,5 +1,4 @@
-import { VUE_META_ATTRIBUTE } from '../../shared/constants'
-
+export default function _attrsGenerator ({ attribute }) {
   /**
    * Generates tag attributes for use on the server.
    *
@@ -7,7 +6,7 @@ import { VUE_META_ATTRIBUTE } from '../../shared/constants'
    * @param  {Object} data - the attributes to generate
    * @return {Object} - the attribute generator
    */
-export default function attrsGenerator (type, data) {
+  return function attrsGenerator (type, data) {
     return {
       text () {
         let attributeStr = ''
@@ -22,8 +21,9 @@ export default function attrsGenerator (type, data) {
             } `
           }
         }
-      attributeStr += `${VUE_META_ATTRIBUTE}="${watchedAttrs.join(',')}"`
+        attributeStr += `${attribute}="${watchedAttrs.join(',')}"`
         return attributeStr.trim()
       }
     }
   }
+}

src/server/generators/tagGenerator.js

@@ -1,5 +1,4 @@
-import { VUE_META_ATTRIBUTE } from '../../shared/constants'
-
+export default function _tagGenerator ({ attribute }) {
   /**
    * Generates meta, base, link, style, script, noscript tags for use on the server
    *
@@ -7,7 +6,7 @@ import { VUE_META_ATTRIBUTE } from '../../shared/constants'
    * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
    * @return {Object} - the tag generator
    */
-export default function tagGenerator (type, tags) {
+  return function tagGenerator (type, tags) {
     return {
       text () {
         // build a string containing all tags of this type
@@ -36,9 +35,10 @@ export default function tagGenerator (type, tags) {
 
           // the final string for this specific tag
           return closed
-          ? `${tagsStr}<${type} ${VUE_META_ATTRIBUTE}="true" ${attrs}/>`
-          : `${tagsStr}<${type} ${VUE_META_ATTRIBUTE}="true" ${attrs}>${content}</${type}>`
+            ? `${tagsStr}<${type} ${attribute}="true" ${attrs}/>`
+            : `${tagsStr}<${type} ${attribute}="true" ${attrs}>${content}</${type}>`
         }, '')
       }
     }
   }
+}

src/server/generators/titleGenerator.js

@@ -1,5 +1,4 @@
-import { VUE_META_ATTRIBUTE } from '../../shared/constants'
-
+export default function _titleGenerator ({ attribute }) {
   /**
    * Generates title output for the server
    *
@@ -7,10 +6,11 @@ import { VUE_META_ATTRIBUTE } from '../../shared/constants'
    * @param  {String} data - the title text
    * @return {Object} - the title generator
    */
-export default function titleGenerator (type, data) {
+  return function titleGenerator (type, data) {
     return {
       text () {
-      return `<${type} ${VUE_META_ATTRIBUTE}="true">${data}</${type}>`
+        return `<${type} ${attribute}="true">${data}</${type}>`
+      }
     }
   }
 }

src/server/inject.js

@@ -1,6 +1,7 @@
 import getMetaInfo from '../shared/getMetaInfo'
 import generateServerInjector from './generateServerInjector'
 
+export default function _inject (options) {
   /**
    * Converts the state of the meta info object such that each item
    * can be compiled to a tag string on the server
@@ -8,16 +9,17 @@ import generateServerInjector from './generateServerInjector'
    * @this {Object} - Vue instance - ideally the root component
    * @return {Object} - server meta info with `toString` methods
    */
-export default function inject () {
+  return function inject () {
     // get meta info with sensible defaults
-  const info = getMetaInfo(this.$root)
+    const info = getMetaInfo(options)(this.$root)
 
     // generate server injectors
     for (let key in info) {
       if (info.hasOwnProperty(key) && key !== 'titleTemplate') {
-      info[key] = generateServerInjector(key, info[key])
+        info[key] = generateServerInjector(options)(key, info[key])
       }
     }
 
     return info
   }
+}

src/shared/$meta.js

@@ -1,15 +1,16 @@
 import inject from '../server/inject'
 import refresh from '../client/refresh'
 
+export default function _$meta (options) {
   /**
    * Returns an injector for server-side rendering.
    * @this {Object} - the Vue instance (a root component)
    * @return {Object} - injector
    */
-export default function $meta () {
-  // bind inject method to this component
+  return function $meta () {
     return {
-    inject: inject.bind(this),
-    refresh: refresh.bind(this)
+      inject: inject(options).bind(this),
+      refresh: refresh(options).bind(this)
+    }
   }
 }

src/shared/constants.js

@@ -1,2 +1,21 @@
+/**
+ * These are constant variables used throughout the application.
+ */
+
+// This is the name of the component option that contains all the information that
+// gets converted to the various meta tags & attributes for the page.
+export const VUE_META_KEY_NAME = 'metaInfo'
+
+// This is the attribute vue-meta augments on elements to know which it should
+// manage and which it should ignore.
 export const VUE_META_ATTRIBUTE = 'data-vue-meta'
-export const SERVER_RENDERED_ATTRIBUTE = 'data-vue-meta-server-rendered'
+
+// This is the attribute that goes on the `html` tag to inform `vue-meta`
+// that the server has already generated the meta tags for the initial render.
+export const VUE_META_SERVER_RENDERED_ATTRIBUTE = 'data-vue-meta-server-rendered'
+
+// This is the property that tells vue-meta to overwrite (instead of append)
+// an item in a tag list. For example, if you have two `meta` tag list items
+// that both have `vmid` of "description", then vue-meta will overwrite the
+// shallowest one with the deepest one.
+export const VUE_META_TAG_LIST_ID_KEY_NAME = 'vmid'

src/shared/getMetaInfo.js

@@ -1,6 +1,7 @@
 import deepmerge from 'deepmerge'
 import getComponentOption from './getComponentOption'
 
+export default function _getMetaInfo ({ keyName, tagIDKeyName }) {
   /**
    * Returns the correct meta info for the given component
    * (child components will overwrite parent meta info)
@@ -8,7 +9,7 @@ import getComponentOption from './getComponentOption'
    * @param  {Object} component - the Vue instance to get meta info from
    * @return {Object} - returned meta info
    */
-export default function getMetaInfo (component) {
+  return function getMetaInfo (component) {
     // set some sane defaults
     const defaultInfo = {
       title: '',
@@ -27,7 +28,7 @@ export default function getMetaInfo (component) {
     // collect & aggregate all metaInfo $options
     const info = getComponentOption({
       component,
-    option: 'metaInfo',
+      option: keyName,
       deep: true,
       arrayMerge (target, source) {
         // we concat the arrays without merging objects contained therein,
@@ -41,7 +42,7 @@ export default function getMetaInfo (component) {
           let shared = false
           for (let sourceIndex in source) {
             const sourceItem = source[sourceIndex]
-          if (targetItem.vmid === sourceItem.vmid) {
+            if (targetItem[tagIDKeyName] === sourceItem[tagIDKeyName]) {
               shared = true
               break
             }
@@ -73,3 +74,4 @@ export default function getMetaInfo (component) {
 
     return deepmerge(defaultInfo, info)
   }
+}

src/shared/plugin.js

@@ -1,17 +1,36 @@
+import assign from 'object-assign'
 import $meta from './$meta'
 
+import {
+  VUE_META_KEY_NAME,
+  VUE_META_ATTRIBUTE,
+  VUE_META_SERVER_RENDERED_ATTRIBUTE,
+  VUE_META_TAG_LIST_ID_KEY_NAME
+} from './constants'
+
 // automatic install
 if (typeof Vue !== 'undefined') {
   Vue.use(VueMeta)
 }
 
+// set some default options
+const defaultOptions = {
+  keyName: VUE_META_KEY_NAME,
+  attribute: VUE_META_ATTRIBUTE,
+  ssrAttribute: VUE_META_SERVER_RENDERED_ATTRIBUTE,
+  tagIDKeyName: VUE_META_TAG_LIST_ID_KEY_NAME
+}
+
 /**
  * Plugin install function.
  * @param {Function} Vue - the Vue constructor.
  */
-export default function VueMeta (Vue) {
+export default function VueMeta (Vue, options = {}) {
+  // combine options
+  options = assign(defaultOptions, options)
+
   // bind the $meta method to this component instance
-  Vue.prototype.$meta = $meta
+  Vue.prototype.$meta = $meta(options)
 
   // store an id to keep track of DOM updates
   let requestId = null