vue实现vxe-pulldown上下键选择功能

本文主要是介绍vue实现vxe-pulldown上下键选择功能，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

<vxe-pulldown v-model="showPull" :disabled="disabled" :transfer="true" size="mini"><template #default><vxe-input v-model="targetName" clearablesize="mini"placeholder="可搜索的下拉框":disabled="disabled"@keyup="keyupEvent"><template #suffix><i class="vxe-icon-search" @click="showSelect"></i></template></vxe-input></template><template #dropdown><div class="my-dropdown" ref="selectContent"><div class="list-item" v-for="item in searchList" :key="item.id" @click="handleSelect(item)"><span>{{ item.name }}—{{item.value}}</span></div></div></template>
</vxe-pulldown>

<style lang="scss" scoped>
.my-dropdown {height: 200px;overflow: auto;border-radius: 4px;border: 1px solid #dcdfe6;background-color: #fff;
}
.list-item{height: 35px;line-height: 35px;padding: 0 10px;
}
.list-item:hover {background-color: #f5f7fa;
}
.active-option{background-color: #f5f7fa;
}
</style>

//上下键选择
function navigatorOptions(direction){if(direction === 'next'){hoverIndex.value++if(hoverIndex.value === searchList.value.length){hoverIndex.value = 0}else{//第一项到当前选中项高度大于滚动高度加下拉框高度if((hoverIndex.value +1)*35 >= document.querySelector('.my-dropdown').scrollTop + 200){document.querySelector('.my-dropdown').scrollTop = (hoverIndex.value+1)*35-200}else if(hoverIndex.value === 0){document.querySelector('.my-dropdown').scrollTop = 0}}}else if(direction === 'prev'){hoverIndex.value--if(hoverIndex.value <0 ){hoverIndex.value = searchList.value.length - 1}if((hoverIndex.value +1) * 35-35 <= document.querySelector('.my-dropdown').scrollTop){document.querySelector('.my-dropdown').scrollTop = (hoverIndex.value+1)*35-35}else if(hoverIndex.value === searchList.value.length - 1){document.querySelector('.my-dropdown').scrollTop = (hoverIndex.value+1)*35-200}}if((hoverIndex.value + 1)*35>200){document.querySelector('.my-dropdown').scrollTop = (hoverIndex.value + 1)*35-200}else{document.querySelector('.my-dropdown').scrollTop = 0}let optionItem = proxy.$refs.selectContent.querySelectorAll('.list-item')optionItem.forEach((item,index)=>{item.classList.remove('active-option')if(index === hoverIndex.value){item.classList.add('active-option')}})searchList.value.forEach((item,index)=>{if(index === hoverIndex.value){innerText.value = item}})
}

//获取下拉框列表
const searchList = ref([])
//是否显示下拉框
const showPull = ref(false)
const hoverIndex = ref(0)
//上下建选中内容
const innerText = ref([])//输入查询
const keyupEvent = (e) => {if(e.$event.keyCode !== 38 && e.$event.keyCode !== 40){hoverIndex.value = 0}//向上if(e.$event.keyCode === 38){navigatorOptions('prev')}//向下if(e.$event.keyCode === 40){navigatorOptions('next')}//enter键if(e.$event.keyCode === 13){handleSelect(innerText.value)}else{showPull.value = true //显示下拉框querySearchList(targetName.value)//搜索数据}}//点击下拉框列表触发
function handleSelect(item) {targetName.value = item.valueshowPull.value = falseemits('commonAutoCompleteSelect', props.param, item.id, item.value, item, props.index)
}

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