1、添加前端组件:选择器支持滚动加载
2、代理配置-端口映射,新增和修改功能服务端端口字段选择器修改为支持滚动加载 3、代理配置-端口映射,后台接口getAvailablePortList修改参数内容并支持滚动加载模式也即是分页加载
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<!--
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采用github上面的开源组件https://github.com/johnhom1024/vue-load-select
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不过有个bug,就是没办法展示下拉的箭头,目前修复的方式:等dom加载完毕后,补充箭头的class
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参考:https://blog.csdn.net/weixin_42381896/article/details/122258563
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-->
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<template>
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<el-select
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ref="selectLoadMore"
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:value="value"
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v-loadmore="loadMore"
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@focus="focus"
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@clear="clear"
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filterable
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remote
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:filter-method="handleSearch"
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:loading="loading"
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clearable
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v-bind="$attrs"
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v-on="$listeners"
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>
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<el-option
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v-for="option in data"
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:label="option[dictLabel]"
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:value="option[dictValue]"
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:key="option.value"
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></el-option>
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<!-- 此处加载中的value可以随便设置,只要不与其他数据重复即可 -->
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<el-option
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v-if="hasMore"
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disabled
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label="加载中..."
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value="-1" />
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<!--补充页面无数据时,显示无数据的效果-->
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<el-option
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v-if="!hasMore && data.length==0"
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disabled
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label="暂无数据"
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value="-2" />
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</el-select>
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</template>
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<script>
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export default {
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name: "SelectLoadMore",
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props: {
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value: {
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default: null
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},
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// 列表数据
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data: {
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type: Array,
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default: () => []
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},
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dictLabel: {
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type: String,
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default: "label"
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},
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dictValue: {
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type: String,
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default: "value"
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},
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// 调用页数的接口
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request: {
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type: Function,
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default: () => {
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}
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},
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// 传入的页码
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page: {
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type: [Number, String],
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default: 1
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},
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// 是否还有更多数据
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hasMore: {
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type: Boolean,
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default: true
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}
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},
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directives: {
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// 这里实现一个组件内部的自定义指令
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loadmore: {
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// 指令的定义
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bind(el, binding) {
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const SELECTWRAP = el.querySelector(
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".el-select-dropdown .el-select-dropdown__wrap"
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);
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if (!SELECTWRAP) {
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throw new Error('获取不到"el-select-dropdown__wrap"节点');
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}
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SELECTWRAP.addEventListener("scroll", () => {
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// scrollTop 这里可能因为浏览器缩放存在小数点的情况,导致了滚动到底部时
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// scrollHeight 减去滚动到底部时的scrollTop ,依然大于clientHeight 导致无法请求更多数据
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// 这里将scrollTop向上取整 保证滚到底部时,触发调用
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const CONDITION =
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SELECTWRAP.scrollHeight -
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Math.ceil(SELECTWRAP.scrollTop) <=
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SELECTWRAP.clientHeight;
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// el.scrollTop !== 0 当输入时,如果搜索结果很少,以至于没看到滚动条,那么此时的CONDITION计算结果是true,会执行bind.value(),此时不应该执行,否则搜索结果不匹配
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if (CONDITION && SELECTWRAP.scrollTop !== 0) {
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binding.value();
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}
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});
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}
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}
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},
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data() {
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return {
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keyword: "", // 存储关键字用
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loading: false
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};
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},
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methods: {
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// 请求下一页的数据
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loadMore() {
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// 如果没有更多数据,则不请求
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if (!this.hasMore) {
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return;
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}
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// 如果intercept属性为true则不请求数据,
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if (this.loadMore.intercept) {
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return;
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}
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this.loadMore.intercept = true;
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this.request({
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page: this.page + 1,
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more: true,
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keyword: this.keyword
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}).then(() => {
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this.loadMore.intercept = false;
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});
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},
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// 选中下拉框没有数据时,自动请求第一页的数据
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focus() {
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if (!this.data.length) {
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this.request({page: 1});
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}
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},
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handleSearch(keyword) {
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this.keyword = keyword;
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this.loading = true;
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console.log(keyword);
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this.request({page: 1, keyword: keyword}).then(() => {
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this.loading = false;
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});
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},
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// 删除选中时,如果请求了关键字,则清除关键字再请求第一页的数据
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clear() {
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if (this.keyword) {
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this.keyword = "";
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this.request({page: 1});
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}
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}
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},
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mounted() {
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this.$nextTick(function () {
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// github代码有个bug,下拉的箭头无法加载的问题,需要等dom页面加载完毕后,添加箭头的class
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let rulesDom = this.$refs["selectLoadMore"].$el.querySelector(
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".el-input .el-input__suffix .el-input__suffix-inner .el-input__icon"
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);// 找到dom
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rulesDom.classList.add("el-icon-arrow-up");// 对dom新增class
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})
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}
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}
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</script>
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<style scoped>
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</style>
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