element的el-select组件数据过多使用分页_

一、代码实现

1. 单个下拉框

<template>
    <div>
        <!-- 为了启用远程搜索，需要将filterable和remote设置为true，同时传入一个remote-method。
        remote-method为一个Function，它会在输入值发生变化时调用，参数为当前输入值。需要注意的是，
        如果el-option是通过v-for指令渲染出来的，此时需要为el-option添加key属性，且其值需具有唯一性，比如此例中的cell.userId -->
        <el-select v-model="obj" value-key="userId" :placeholder="userName ? userName : '请选择'" filterable :remote-method="getData"  remote
            @change="change($event)" style="width: 100%">
            <el-option v-for="cell in dataList" :key="cell.userId" :label="(cell.nickName + '(' + cell.deptName + ')')"
                :value="cell">
            </el-option>
            <div class="pagination-css">
                <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="pageNum"
                    :page-sizes="[2, 5, 10, 15]" :page-size="pageSize" layout="total, sizes, prev, pager, next, jumper"
                    :total="total">
                </el-pagination>
            </div>

        </el-select>
    </div>
</template>
  
<script>

export default {
    name: "pageSelect",
    data() {
        return {
            obj: {},
            userName: '',
            // 数据
            dataList: [
                {
                    userId: 1,
                    nickName: '张三',
                    deptId: 1,
                    deptName: '测试1'
                },
                {
                    userId: 2,
                    nickName: '李四',
                    deptId: 2,
                    deptName: '测试2'
                },
                {
                    userId: 3,
                    nickName: '王五',
                    deptId: 3,
                    deptName: '测试3'
                },
                {
                    userId: 4,
                    nickName: '赵六',
                    deptId: 4,
                    deptName: '测试4'
                }, {
                    userId: 5,
                    nickName: '小米',
                    deptId: 5,
                    deptName: '测试5'
                },
                {
                    userId: 6,
                    nickName: '小明',
                    deptId: 6,
                    deptName: '测试6'
                },
                {
                    userId: 7,
                    nickName: '小张',
                    deptId: 7,
                    deptName: '测试7'
                },
            ],
            pageNum: 1,
            pageSize: 10,
            total: 7,
            search:'',

        };
    },
    methods: {
        //获取数据（远程搜索）
        getData(search){
            console.log(search,'search')
            if (typeof search == "string") {
                this.search = search;
            }
            // 根据实际项目调用
            // getList({
            //     pageNum: this.pageNum,
            //     pageSize: this.pageSize,
            //     nickName:  this.search,
            // }).then((response) => {
            //     this.dataList = response.rows;
            //     this.total = response.total;
            // });
        }, 
        //选择
        change(event) {
            console.log(event,'event')
            // 如果有多个下拉框，需要判断数据不重复选择，可以获取选中的数据列表的唯一值组成的数组
            // 然后判断唯一值有没有重复（数组去重，判断前后数组长度是否变化），有则是提示不能重复选择。
        },
        // 分页相关
        handleSizeChange(val) {
            console.log(`每页 ${val} 条`);
            this.pageSize = val;
        },
        handleCurrentChange(val) {
            console.log(`当前页: ${val}`);
            this.pageNum = val;
        },
    },
};
</script>
<style>
.pagination-css {
    width: 100%;
    display: flex;
    justify-content: flex-end;
}
</style>
  
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2. 多个下拉框

<template>
    <div class="person-box">
        <div class="add-css">
            <el-button size="mini" type="success" plain @click="add">
                添加
            </el-button>
        </div>

        <el-form ref="form" :inline="false" :model="form" :rules="rules" label-position="right" label-suffix=":"
            label-width="120px">
            <div class="person-list">
                <div class="person-item" v-for="(item, index) in form.list" :key="item.id">
                    <div class="num-box">{{ index + 1 }}.</div>
                    <el-row :gutter="20" type="flex">
                        <el-col :span="20">
                            <el-form-item label="" :prop="`list.${index}.personObj`" :rules="rules.personObj">
                                <el-select v-model="item.personObj" value-key="userId"
                                    :placeholder="item.userName ? item.userName : '请选择'" filterable
                                    :remote-method="getPersonList" remote @change="personChange($event, item)"
                                    style="width: 100%">
                                    <el-option v-for="cell in personData" :key="cell.userId"
                                        :label="cell.nickName + '(' + cell.deptName + ')'" :value="cell">
                                    </el-option>

                                    <div class="pagination-css">
                                        <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
                                            :current-page="pageNum" :page-sizes="[2, 5, 10, 15]" :page-size="pageSize"
                                            layout="total, sizes, prev, pager, next, jumper" :total="total">
                                        </el-pagination>
                                    </div>

                                </el-select>
                            </el-form-item>
                        </el-col>
                        <el-col :span="4">
                            <el-button size="mini" type="danger" plain @click="del(item)"
                                style="margin-bottom: 22px; margin-left: 20px">
                                删除
                            </el-button>
                        </el-col>
                    </el-row>
                </div>
            </div>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="handleClose('close')">取 消</el-button>
            <el-button type="primary" @click="submitHandle">确 定</el-button>
        </span>
        <!-- 
        1.安装  npm install uuid --save
        2.调用
            import { v4 as uuidv4 } from 'uuid';
            uuidv4(); 
         -->
    </div>
</template>


    
<script>
// import { getUuid } from "@/utils/helper";
import { v4 as getUuid } from 'uuid';
export default {
    name: "pageSelect2",
    components: {},
    props: {
        // 默认选中的数据
        personList: {
            type: Array,
            default: () => {
                return [];
            },
        },
        taskId: {
            type: String,
            default: "",
        },
    },
    data() {
        return {
            form: {
                // 人员信息
                list: [
                    {
                        uuid: getUuid(),
                        personObj: null,
                        userId: null,
                        nickName: null,
                        userName: null,
                        deptName: null
                    },
                ],
            },
            rules: {
                personObj: [
                    {
                        required: true,
                        message: "人员不能为空",
                        trigger: ["blur", "change"],
                    },
                ],
            },
            // 模糊查询人员
            personData: [
                {
                    userId: 1,
                    nickName: '张三',
                    deptId: 1,
                    deptName: '测试1'
                },
                {
                    userId: 2,
                    nickName: '李四',
                    deptId: 2,
                    deptName: '测试2'
                },
                {
                    userId: 3,
                    nickName: '王五',
                    deptId: 3,
                    deptName: '测试3'
                },
                {
                    userId: 4,
                    nickName: '赵六',
                    deptId: 4,
                    deptName: '测试4'
                }, {
                    userId: 5,
                    nickName: '小米',
                    deptId: 5,
                    deptName: '测试5'
                },
                {
                    userId: 6,
                    nickName: '小明',
                    deptId: 6,
                    deptName: '测试6'
                },
                {
                    userId: 7,
                    nickName: '小张',
                    deptId: 7,
                    deptName: '测试7'
                },
            ],
            total: 0,
            pageNum: 1,
            pageSize: 1000,
            search: "",
        };
    },
    computed: {
    },
    watch: {
        personList: {
            handler(val) {
                if (val && val != "") {
                    this.form.list = JSON.parse(JSON.stringify(val));
                    if (this.form.list && this.form.list != "") {
                        this.form.list.forEach((item) => {
                            item.uuid = getUuid();
                            item.personObj = item;
                        });
                    }
                } else {
                    this.form.list = [
                        {
                            uuid: getUuid(),
                            personObj: null,
                            userId: null,
                            nickName: null,
                            userName: null,
                            deptName: null
                        },
                    ];
                }
            },
            deep: true,
            immediate: true,
        },
        $route: {
            handler() {
                this.getPersonList();
            },
            immediate: true,
            deep: true,
        },
    },
    methods: {
        // 分页相关
        handleSizeChange(val) {
            console.log(`每页 ${val} 条`);
            this.pageSize = val;
            this.getPersonList();
        },
        handleCurrentChange(val) {
            console.log(`当前页: ${val}`);
            this.pageNum = val;
            this.getPersonList();
        },

        // 查询人员数据
        getPersonList(value) {
            //console.log(value,"查询", typeof value);
            if (typeof value == "string") {
                this.search = value;
            }

            // listUser({
            //     pageNum: this.pageNum,
            //     pageSize: this.pageSize,
            //      search:this.search,
            // }).then((response) => {
            //     this.personData = response.rows;
            //     this.total = response.total;
            // });
        },

        //选中，值改变
        personChange(data, row) {
            this.form.list.forEach((item) => {
                if (item.uuid == row.uuid) {
                    item.userId = data.userId;
                    item.userName = data.nickName;
                    item.deptName = data.deptName;
                }
            });
        },

        // 添加人员
        add() {
            this.form.list.push({
                uuid: getUuid(),
                personObj: null,
                userId: null,
                nickName: null,
                userName: null,
                deptName: null
            });
        },
        //编辑-删除人员
        del(row) {
            this.form.list = this.form.list.filter((ele) => {
                return ele.uuid != row.uuid;
            });
        },

        // 取消
        handleClose(type = "") {
            this.$emit("handleClose", type);
        },
        // 提交
        submitHandle() {
            //判断是否重复，重复的话需要去重，给一个提示
            let isReturn = this.judgeRepeatHandle(this.form.list);
            if (!isReturn) {
                let userIds = [];
                if (this.form.list) {
                    this.form.list.forEach((item) => {
                        if (item.userId) {
                            userIds.push(item.userId);
                        }
                    });
                }
                console.log(this.form, 'this.form')
                console.log(userIds, 'userIds')
                this.$refs["form"].validate((valid) => {
                    if (valid) {
                        // ......................
                    }
                });
            }

        },

        //判断是否重复，重复的话需要去重，给一个提示
        judgeRepeatHandle(list) {
            let isReturn = false
            console.log(list)
            let userIdList = list.map(item => item.userId)
            let userIdList2 = [... new Set(userIdList)]
            console.log(userIdList, 'userIdList')
            console.log(userIdList2, 'userIdList2')
            if (userIdList.length != userIdList2.length) {
                this.$message("人员不能重复选择！")
                isReturn = true
            }
            return isReturn
        },
    },
};
</script>
    
<style scoped>
.person-box {
    width: 100%;
    display: flex;
    flex-direction: column;
}

.add-css {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.dialog-footer {
    width: 95%;
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

::v-deep .el-form-item__content {
    margin-left: 0px !important;
}

::v-deep .el-row--flex {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.person-list::-webkit-scrollbar {
    display: none;
}

.person-list {
    width: 100%;
    margin-top: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

.person-item {
    width: 95%;
    margin-left: 5%;
    box-sizing: border-box;
    position: relative;
    box-sizing: border-box;
}

.num-box {
    position: absolute;
    top: 15%;
    left: -3%;
}

.pagination-css {
    width: 100%;
    display: flex;
    justify-content: flex-end;
}
</style>
    
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二、效果图