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vue-head.js
277 lines (255 loc) · 6.48 KB
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vue-head.js
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/* eslint-disable */
;(function() {
'use strict'
var opt = {
complement: window.document.title,
separator: '|'
}
var diffTitle = {}
var els = []
var diffEls = []
var substitutedEls = []
var originalSubstitutedEls = []
var installed = false
var util = {
/**
* Shorthand
* @type {Object}
*/
shorthand: {
ch: 'charset',
tg: 'target',
n: 'name',
he: 'http-equiv',
ip: 'itemprop',
c: 'content',
p: 'property',
sc: 'scheme',
r: 'rel',
h: 'href',
sz: 'sizes',
t: 'type',
s: 'src',
a: 'async',
d: 'defer',
i: 'inner'
},
/**
* This function return the element <head>
* @type {Function}
* @return {Object}
*/
getPlace: function (place) {
return window.document.getElementsByTagName(place)[0]
},
/**
* Undo the window.document title for previous state
* @type {Function}
* @param {Object} state
*/
undoTitle: function (state) {
if (!state.before) return
window.document.title = state.before
},
/**
* Undo elements to its previous state
* @type {Function}
*/
undo: function () {
if (!els.length) return
els.forEach(function (el) {
el.parentElement.removeChild(el)
})
els = []
if(!substitutedEls.length) return
substitutedEls.forEach(function (el, idx) {
var parent = el.parentElement
parent.replaceChild(originalSubstitutedEls[idx], el)
})
substitutedEls = []
originalSubstitutedEls = []
},
/**
* Set attributes in element
* @type {Function}
* @param {Object} obj
* @param {HTMLElement} el
* @return {HTMLElement} with defined attributes
*/
prepareElement: function (obj, el) {
var self = this
Object.keys(obj).forEach(function (prop) {
var sh = self.shorthand[prop] || prop
if (sh.match(/(body|undo|replace)/g)) return
if (sh === 'inner') {
el.textContent = obj[prop]
return
}
el.setAttribute(sh, obj[prop])
})
return el
},
/**
* Change window.document title
* @type {Function}
* @param {Object} obj
*/
title: function (obj) {
if (!obj) return
diffTitle.before = opt.complement
var title = obj.inner + ' ' + (obj.separator || opt.separator) +
' ' + (obj.complement || opt.complement)
window.document.title = title.trim()
},
/**
* Update Element
*/
update: function () {
if (!els.length) return
els.forEach(function(el, key) {
if (diffEls[key] && !diffEls[key].isEqualNode(el)) {
el.parentElement.replaceChild(diffEls[key], els[key])
els.splice(key, 1, diffEls[key])
return
}
})
diffEls = []
},
/**
* Add Elements
* @param {Object} obj
* @param {HTMLElement} el
* @param {HTMLElement} parent
*/
add: function (obj, el, parent) {
parent.appendChild(el)
// Fixed elements that do not suffer removal
if (obj.undo !== undefined && !obj.undo) return
// Elements which are removed
els.push(el)
},
/**
* Handle of create elements
* @type {Function}
* @param {Array} arr
* @param {String} tag - style, link, meta, script, base
* @param {String} place - Default 'head'
* @param {Boolean} update
*/
handle: function (arr, tag, place, update) {
var self = this
if (!arr) return
arr.forEach(function (obj) {
var parent = (obj.body) ? self.getPlace('body') : self.getPlace(place)
var el = window.document.getElementById(obj.id)
if (!el) {
el = window.document.createElement(tag)
update = false
}
// Elements that will substitute data
if (el.hasAttribute('id')) {
originalSubstitutedEls.push(el.cloneNode(true))
self.prepareElement(obj, el)
substitutedEls.push(el)
return
}
// Other elements
el = self.prepareElement(obj, el)
// Updated elements
if (update) {
diffEls.push(el)
return
}
// Append Elements
self.add(obj, el, parent)
})
}
}
/**
* Plugin | vue-head
* @param {Function} Vue
* @param {Object} options
*/
function VueHead (Vue, options) {
if (installed) return
installed = true
if (options) {
Vue.util.extend(opt, options)
}
/**
* Initializes and updates the elements in the head
* @param {Boolean} update
*/
function init (update) {
var self = this
var head = (typeof self.$options.head === 'function') ? self.$options.head.bind(self)() : self.$options.head
if (!head) return
Object.keys(head).forEach(function (key) {
var prop = head[key]
if (!prop) return
var obj = (typeof prop === 'function') ? head[key].bind(self)() : head[key]
if (key === 'title') {
util[key](obj)
return
}
util.handle(obj, key, 'head', update)
})
self.$emit('okHead')
}
/**
* Remove the meta tags elements in the head
*/
function destroy () {
if (!this.$options.head) return
util.undoTitle(diffTitle)
util.undo()
}
// v1
if (Vue.version.match(/[1].(.)+/g)) {
Vue.mixin({
ready: function () {
init.call(this)
},
destroyed: function () {
destroy.call(this)
},
events: {
updateHead: function () {
init.call(this, true)
util.update()
}
}
})
}
// v2
if (Vue.version.match(/[2].(.)+/g)) {
Vue.mixin({
created: function () {
var self = this
self.$on('updateHead', function () {
init.call(this, true)
util.update()
})
},
mounted: function () {
init.call(this)
},
beforeDestroy: function () {
destroy.call(this)
}
})
}
}
VueHead.version = '2.2.0'
// auto install
if (typeof Vue !== 'undefined') {
Vue.use(VueHead)
}
if(typeof exports === 'object' && typeof module === 'object') {
module.exports = VueHead
} else if(typeof define === 'function' && define.amd) {
define(function () { return VueHead })
} else if (typeof window !== 'undefined') {
window.VueHead = VueHead
}
})()