dropdown.vue
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<template>
<div class="ivu-select-dropdown"><slot></slot></div>
</template>
<script>
import Popper from 'popper.js';
export default {
data () {
return {
popper: null
}
},
methods: {
update () {
if (this.popper) {
this.$nextTick(() => {
this.popper.update();
});
} else {
this.$nextTick(() => {
this.popper = new Popper(this.$parent.$els.reference, this.$el, {
gpuAcceleration: false,
placement: 'bottom-start',
boundariesPadding: 0,
forceAbsolute: true
});
this.popper.onCreate(popper => {
this.resetTransformOrigin(popper);
});
});
}
},
destroy () {
if (this.popper) {
this.resetTransformOrigin(this.popper);
setTimeout(() => {
this.popper.destroy();
this.popper = null;
}, 300);
}
},
resetTransformOrigin(popper) {
let placementMap = {top: 'bottom', bottom: 'top'};
let placement = popper._popper.getAttribute('x-placement').split('-')[0];
let origin = placementMap[placement];
popper._popper.style.transformOrigin = `center ${ origin }`;
}
},
ready () {
this.$on('on-update-popper', this.update);
this.$on('on-destroy-popper', this.destroy);
},
beforeDestroy () {
if (this.popper) {
this.popper.destroy();
}
}
}
</script>