back-top.vue
2.36 KB
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<template>
<div :class="classes" :style="styles" @click="back">
<slot>
<div :class="innerClasses">
<i class="ivu-icon ivu-icon-ios-arrow-up"></i>
</div>
</slot>
</div>
</template>
<script>
import { scrollTop } from '../../utils/assist';
import { on, off } from '../../utils/dom';
const prefixCls = 'ivu-back-top';
export default {
props: {
height: {
type: Number,
default: 400
},
bottom: {
type: Number,
default: 30
},
right: {
type: Number,
default: 30
},
duration: {
type: Number,
default: 1000
}
},
data () {
return {
backTop: false
};
},
mounted () {
// window.addEventListener('scroll', this.handleScroll, false);
// window.addEventListener('resize', this.handleScroll, false);
on(window, 'scroll', this.handleScroll);
on(window, 'resize', this.handleScroll);
},
beforeDestroy () {
// window.removeEventListener('scroll', this.handleScroll, false);
// window.removeEventListener('resize', this.handleScroll, false);
off(window, 'scroll', this.handleScroll);
off(window, 'resize', this.handleScroll);
},
computed: {
classes () {
return [
`${prefixCls}`,
{
[`${prefixCls}-show`]: this.backTop
}
];
},
styles () {
return {
bottom: `${this.bottom}px`,
right: `${this.right}px`
};
},
innerClasses () {
return `${prefixCls}-inner`;
}
},
methods: {
handleScroll () {
this.backTop = window.pageYOffset >= this.height;
},
back () {
const sTop = document.documentElement.scrollTop || document.body.scrollTop;
scrollTop(window, sTop, 0, this.duration);
this.$emit('on-click');
}
}
};
</script>