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favicon-image.html
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favicon-image.html
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<!DOCTYPE html>
<html>
<body>
<dom-module id="favicon-image">
<script>
Polymer({
is: 'favicon-image',
properties: {
appleTouchIconSizes: {
type: Array,
value: [57, 60, 72, 76, 114, 120, 144, 152]
},
iconSizes: {
type: Array,
value: [196, 160, 96, 16, 32]
},
msTileColor: {
type: String,
value: '#ffffff'
},
msTileSizes: {
type: Array,
value: [144]
},
suffix: {
type: String,
value: '.png'
},
prefix: {
type: String,
value: 'favicon-',
notify: true
},
path: {
type: String,
value: '/'
}
},
attached: function() {
this.updateSizes();
this._createIco();
},
_findOrCreateHeadElement: function(attributes) {
var el = this._findHeadElement(attributes);
if(!el) {
el = document.createElement('link');
Object.keys(attributes)
.forEach((attributeKey) => {
el.setAttribute(attributeKey, attributes[attributeKey]);
});
document.head.appendChild(el);
}
return el;
},
_findHeadElement: function(attributes) {
var selector = 'head > link' + Object.keys(attributes)
.map((attributeKey) => '[' + attributeKey + '="' + attributes[attributeKey] + '"]')
.join('');
return document.head.querySelector(selector);
},
_getFileUrl: function(size) {
return this.path + this.prefix + [size, size].join('x') + this.suffix;
},
_createAppleTouchIcon: function(size) {
var el = this._findOrCreateHeadElement({
rel: 'apple-touch-icon',
sizes: [size, size].join('x')
});
el.setAttribute('href', this._getFileUrl(size));
},
_createIcon: function(size) {
var el = this._findOrCreateHeadElement({
rel: 'icon',
sizes: [size, size].join('x')
});
el.setAttribute('href', this._getFileUrl(size));
},
_createIco: function() {
var el = this._findOrCreateHeadElement({
rel: 'icon',
type: 'image/x-icon'
});
el.setAttribute('href', this.path + 'favicon.ico');
el.setAttribute('type', 'image/x-icon');
},
updateSizes: function() {
var sizes = []
.concat(this.appleTouchIconSizes)
.concat(this.iconSizes);
var el;
sizes
.filter((size) => (this.appleTouchIconSizes.indexOf(size) !== -1))
.forEach((size) => this._createAppleTouchIcon(size));
sizes
.forEach((size) => this._createIcon(size));
this.set('sizes', sizes);
}
});
</script>
</dom-module>
</body>
</html>