dropdown.vue
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<template>
<div class="ivu-select-dropdown" :class="className" :style="styles"><slot></slot></div>
</template>
<script>
import Vue from 'vue';
const isServer = Vue.prototype.$isServer;
import { getStyle } from '../../utils/assist';
const Popper = isServer ? function() {} : require('popper.js/dist/umd/popper.js'); // eslint-disable-line
export default {
name: 'Drop',
props: {
placement: {
type: String,
default: 'bottom-start'
},
className: {
type: String
}
},
data () {
return {
popper: null,
width: '',
popperStatus: false
};
},
computed: {
styles () {
let style = {};
if (this.width) style.width = `${this.width}px`;
return style;
}
},
methods: {
update () {
if (isServer) return;
if (this.popper) {
this.$nextTick(() => {
this.popper.update();
this.popperStatus = true;
});
} else {
this.$nextTick(() => {
this.popper = new Popper(this.$parent.$refs.reference, this.$el, {
placement: this.placement,
modifiers: {
computeStyle:{
gpuAcceleration: false
},
preventOverflow :{
boundariesElement: 'viewport'
}
},
onCreate:()=>{
this.resetTransformOrigin();
this.$nextTick(this.popper.update());
},
onUpdate:()=>{
this.resetTransformOrigin();
}
});
});
}
// set a height for parent is Modal and Select's width is 100%
if (this.$parent.$options.name === 'iSelect') {
this.width = parseInt(getStyle(this.$parent.$el, 'width'));
}
},
destroy () {
if (this.popper) {
setTimeout(() => {
if (this.popper && !this.popperStatus) {
this.popper.destroy();
this.popper = null;
}
this.popperStatus = false;
}, 300);
}
},
resetTransformOrigin() {
// 不判断，Select 会报错，不知道为什么
if (!this.popper) return;
let x_placement = this.popper.popper.getAttribute('x-placement');
let placementStart = x_placement.split('-')[0];
let placementEnd = x_placement.split('-')[1];
const leftOrRight = x_placement === 'left' || x_placement === 'right';
if(!leftOrRight){
this.popper.popper.style.transformOrigin = placementStart==='bottom' || ( placementStart !== 'top' && placementEnd === 'start') ? 'center top' : 'center bottom';
}
}
},
created () {
this.$on('on-update-popper', this.update);
this.$on('on-destroy-popper', this.destroy);
},
beforeDestroy () {
if (this.popper) {
this.popper.destroy();
}
}
};
</script>