vue-countTo.vue
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<template>
<span>
{{displayValue}}
</span>
</template>
<script>
import { requestAnimationFrame, cancelAnimationFrame } from './requestAnimationFrame.js'
export default {
props: {
startVal: {
type: Number,
required: false,
default: 0
},
endVal: {
type: Number,
required: false,
default: 2017
},
duration: {
type: Number,
required: false,
default: 3000
},
autoplay: {
type: Boolean,
required: false,
default: true
},
decimals: {
type: Number,
required: false,
default: 0,
validator(value) {
return value >= 0
}
},
decimal: {
type: String,
required: false,
default: '.'
},
separator: {
type: String,
required: false,
default: ','
},
prefix: {
type: String,
required: false,
default: ''
},
suffix: {
type: String,
required: false,
default: ''
},
useEasing: {
type: Boolean,
required: false,
default: true
},
easingFn: {
type: Function,
default(t, b, c, d) {
return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b;
}
}
},
data() {
return {
localStartVal: this.startVal,
displayValue: this.formatNumber(this.startVal),
printVal: null,
paused: false,
localDuration: this.duration,
startTime: null,
timestamp: null,
remaining: null,
rAF: null
};
},
computed: {
countDown() {
return this.startVal > this.endVal
}
},
watch: {
startVal() {
if (this.autoplay) {
this.start();
}
},
endVal() {
if (this.autoplay) {
this.start();
}
}
},
mounted() {
if (this.autoplay) {
this.start();
}
this.$emit('mountedCallback')
},
methods: {
start() {
this.localStartVal = this.startVal;
this.startTime = null;
this.localDuration = this.duration;
this.paused = false;
this.rAF = requestAnimationFrame(this.count);
},
pauseResume() {
if (this.paused) {
this.resume();
this.paused = false;
} else {
this.pause();
this.paused = true;
}
},
pause() {
cancelAnimationFrame(this.rAF);
},
resume() {
this.startTime = null;
this.localDuration = +this.remaining;
this.localStartVal = +this.printVal;
requestAnimationFrame(this.count);
},
reset() {
this.startTime = null;
cancelAnimationFrame(this.rAF);
this.displayValue = this.formatNumber(this.startVal);
},
count(timestamp) {
if (!this.startTime) this.startTime = timestamp;
this.timestamp = timestamp;
const progress = timestamp - this.startTime;
this.remaining = this.localDuration - progress;
if (this.useEasing) {
if (this.countDown) {
this.printVal = this.localStartVal - this.easingFn(progress, 0, this.localStartVal - this.endVal, this.localDuration)
} else {
this.printVal = this.easingFn(progress, this.localStartVal, this.endVal - this.localStartVal, this.localDuration);
}
} else {
if (this.countDown) {
this.printVal = this.localStartVal - ((this.localStartVal - this.endVal) * (progress / this.localDuration));
} else {
this.printVal = this.localStartVal + (this.endVal - this.localStartVal) * (progress / this.localDuration);
}
}
if (this.countDown) {
this.printVal = this.printVal < this.endVal ? this.endVal : this.printVal;
} else {
this.printVal = this.printVal > this.endVal ? this.endVal : this.printVal;
}
this.displayValue = this.formatNumber(this.printVal)
if (progress < this.localDuration) {
this.rAF = requestAnimationFrame(this.count);
} else {
this.$emit('callback');
}
},
isNumber(val) {
return !isNaN(parseFloat(val))
},
formatNumber(num) {
num = num.toFixed(this.decimals);
num += '';
const x = num.split('.');
let x1 = x[0];
const x2 = x.length > 1 ? this.decimal + x[1] : '';
const rgx = /(\d+)(\d{3})/;
if (this.separator && !this.isNumber(this.separator)) {
while (rgx.test(x1)) {
x1 = x1.replace(rgx, '$1' + this.separator + '$2');
}
}
return this.prefix + x1 + x2 + this.suffix;
}
},
destroyed() {
cancelAnimationFrame(this.rAF)
}
};
</script>