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<template>
<div :style="style" aria-hidden="true">
<!-- this img is not displayed; it is used to detect failure-to-load of div background image -->
<img v-if="this.isImage" style="display: none" :src="this.src"/>
<span v-show="!this.isImage">{{ userInitial }}</span>
</div>
</template>
<script>
const getInitials = (username) => {
let parts = username.split(/[ -]/)
let initials = ''
for (var i = 0; i < parts.length; i++) {
initials += parts[i].charAt(0)
}
if (initials.length > 3 && initials.search(/[A-Z]/) !== -1) {
initials = initials.replace(/[a-z]+/g, '')
}
initials = initials.substr(0, 3).toUpperCase()
return initials
}
export default {
name: 'avatar',
props: {
username: {
type: String
},
inline: {
type: Boolean
},
size: {
type: Number,
default: 50
},
src: {
type: String
},
rounded: {
type: Boolean,
default: true
},
lighten: {
type: Number,
default: 80
},
parser: {
type: Function,
default: getInitials,
validator: (parser) => typeof parser('John', getInitials) === 'string'
}
},
data () {
return {
backgroundColor:
'#CCCCCC',
imgError: false
}
},
mounted () {
if (!this.isImage) {
this.$emit('avatar-initials', this.username, this.userInitial)
}
},
computed: {
background () {
if (!this.isImage) {
return this.backgroundColor || this.randomBackgroundColor(this.username.length, this.backgroundColors)
}
else {
return "";
}
},
isImage () {
return !this.imgError && Boolean(this.src)
},
style () {
const style = {
display: 'flex',
width: `${this.size}px`,
height: `${this.size}px`,
borderRadius: this.rounded ? '50%' : 0,
lineHeight: `${(this.size + Math.floor(this.size / 20))}px`,
fontWeight: 'bold',
alignItems: 'center',
justifyContent: 'center',
textAlign: 'center',
userSelect: 'none'
}
const imgBackgroundAndFontStyle = {
background: `transparent url('${this.src}') no-repeat scroll 0% 0% / ${this.size}px ${this.size}px content-box border-box`
}
const initialBackgroundAndFontStyle = {
backgroundColor: this.background,
font: `${Math.floor(this.size / 2.5)}px/${this.size}px Helvetica, Arial, sans-serif`,
color: this.fontColor
}
const backgroundAndFontStyle = (this.isImage)
? imgBackgroundAndFontStyle
: initialBackgroundAndFontStyle
Object.assign(style, backgroundAndFontStyle)
return style
},
userInitial () {
if (!this.isImage) {
const initials = this.initials || this.parser(this.username, getInitials)
return initials
}
return ''
}
},
methods: {
initial: getInitials,
onImgError () {
this.imgError = true
},
randomBackgroundColor (seed, colors) {
return colors[seed % (colors.length)]
},
lightenColor (hex, amt) {
// From https://css-tricks.com/snippets/javascript/lighten-darken-color/
var usePound = false
if (hex[0] === '#') {
hex = hex.slice(1)
usePound = true
}
var num = parseInt(hex, 16)
var r = (num >> 16) + amt
if (r > 255) r = 255
else if (r < 0) r = 0
var b = ((num >> 8) & 0x00FF) + amt
if (b > 255) b = 255
else if (b < 0) b = 0
var g = (num & 0x0000FF) + amt
if (g > 255) g = 255
else if (g < 0) g = 0
return (usePound ? '#' : '') + (g | (b << 8) | (r << 16)).toString(16)
}
}
}
</script>