【element-ui】使用el-checkbox完成el-table表格数据的全选操作

【element-ui】使用el-checkbox完成el-table表格数据的全选操作

需求:表格有一列为勾选框列,表格下面有单独的按钮本页勾选和全部勾选,跨页状态可以保存回显,如下图所示:

思路:使用一个数组[]存储每一页是否全选的状态,再使用{}来存储数据的所有选中状态,其中key为对应的页码,value为每一页的选中数据【核心❗】

1、el-table表格每一行绑定状态,这里没有使用el-table自带的type为selection的多选框

<el-table-column
         label="选择"
         width="60"
         align="center"
   >
       <template slot-scope="scope">
       <el-checkbox v-model="scope.row.isSelect" :label="scope.row"  @change="(val) => handleSelect(val, scope.row)"><br></el-checkbox>
       </template>
 </el-table-column>

 <div style="float: left; line-height: 28px" class="ml15">
        <el-checkbox v-model="currentCheck" @change="chooseCurrent">本页全选</el-checkbox>
       <el-checkbox v-model="allCheck" @change="chooseAll" >全部选择</el-checkbox>(已选 <span class="txt_primary">{{sum}}</span> 条)
</div>

2、初始化准备好各种数据

data() {
        return {
        tableData: [], // 表格
        allCheckedList:{}, // 所有选中数据
        currentChecked:[], // 每页状态
        tablePage:[10, 1, 500],
        currentCheck:false,
        allCheck:false,
        pageSum:0,
       sum:0,
      };
   },

methods:{
           // 加载表格并初始化各项数据
            loadTable() {
                axios({
                    method: "post",
                    url: "",
                    data: {
                        ajax: true,
                        act: "", 
                    },
                }).then((response) => {
                    let resp = response.data;
                    if (resp.su***ess) {
                        this.tableData = resp.list;
                        this.tablePage =  resp.pagging;
                        this.tableData.forEach(item=>{
                            this.$set(item, 'isSelect', false)
                        });
                        this.currentChecked = [];
                        if(this.tablePage[2]%this.tablePage[0] !=0 ){
                            this.pageSum = parseInt(this.tablePage[2]/this.tablePage[0]) + 1 ;
                        } else {
                            this.pageSum = parseInt(this.tablePage[2]/this.tablePage[0]);
                        }
                        for(let i=0; i<this.pageSum;i++){
                            this.currentChecked.push('false');
                        }
                        for(let i=1; i<=this.pageSum; i++){
                            this.allCheckedList[i] = [];
                        }
                    } else {}
                }).catch(error=> {});
            },}

3、主要的全选、单选、取消勾选等联动逻辑

   methods:{            
            // 本页全选
            chooseCurrent(){
                if(this.currentCheck){
                    this.currentChecked[(this.tablePage[1]-1)] = 'true';
                    this.tableData.forEach(item=>{
                        this.$set(item, 'isSelect', true);
                    });
                    for(let key in this.allCheckedList){
                        if(key == this.tablePage[1]){
                            this.allCheckedList[this.tablePage[1]] = deepclone(this.tableData);
                        }
                    }
                } else {
                    this.currentChecked[(this.tablePage[1]-1)] = 'false';
                    this.tableData.forEach(item=>{
                        this.$set(item, 'isSelect', false);
                    });
                    for(let key in this.allCheckedList){
                        if(key == this.tablePage[1]){
                            this.allCheckedList[this.tablePage[1]]= [];
                        }
                    }
                }
            },
            // 全部全选
            chooseAll(){
                if(this.allCheck){
                    this.currentChecked = [];
                    for(let key in this.allCheckedList){
                        this.allCheckedList[key] = [];
                    }
                    if(this.tablePage[2]%this.tablePage[0] !=0 ){
                        this.pageSum = parseInt(this.tablePage[2]/this.tablePage[0]) + 1 ;
                    } else {
                        this.pageSum = parseInt(this.tablePage[2]/this.tablePage[0]);
                    }
                    for(let i=0; i<this.pageSum;i++){
                        this.currentChecked.push('true');
                    }
                    for(let key in this.allCheckedList){
                        if(key == this.tablePage[1]){
                            this.allCheckedList[this.tablePage[1]] = deepclone(this.tableData);
                        }
                    }
                } else {
                    this.currentChecked = [];
                    for(let key in this.allCheckedList){
                        this.allCheckedList[key] = [];
                    }
                    for(let i=0; i<this.pageSum;i++){
                        this.currentChecked.push('false');
                    }
                }
            },
            // 单行选择
            handleSelect(val,row){
                if(val){
                    for (let key in this.allCheckedList){
                        if(key == this.tablePage[1]){
                            let hasObj = false;
                            this.allCheckedList[this.tablePage[1]].forEach(item =>{
                                if (item.durrec_id == row.durrec_id) {
                                    hasObj = true;
                                }
                            })
                            if (!hasObj) {
                                this.allCheckedList[this.tablePage[1]].push(row);
                            }
                        }
                    }
                } else {
                    for ( let key in this.allCheckedList){
                        if(key == this.tablePage[1]){
                            for(let i = 0; i < this.allCheckedList[this.tablePage[1]].length;i++){
                                if(row.durrec_id == this.allCheckedList[this.tablePage[1]][i].durrec_id){
                                    this.allCheckedList[this.tablePage[1]].splice(i,1)
                                }
                            }
                        }
                    }
                }
                for(let key in this.allCheckedList){
                    if(key == this.tablePage[1]){
                        if(this.allCheckedList[this.tablePage[1]].length == this.tableData.length){
                            this.currentChecked[(this.tablePage[1]-1)] = 'true';
                        } else {
                            this.currentChecked[(this.tablePage[1]-1)] = 'false';
                        }
                    }
                }
            },

           // 计算已选数据
            checkSum(){
                this.sum = 0;
                let currentSum = [];
                for(let i = 0; i<this.currentChecked.length;i++){
                    if(this.currentChecked[i] == 'true' && (i + 1) != this.pageSum){
                        currentSum.push(this.tablePage[0]);
                    } else if(this.currentChecked[i] == 'true' && (i + 1) == this.pageSum){
                        currentSum.push(this.tablePage[2] - this.tablePage[0] * (this.pageSum -1));
                    } else {
                        currentSum.push(this.allCheckedList[i+1].length);
                    }
                }
                for(let i = 0; i< currentSum.length;i++){
                    this.sum += currentSum[i];
                }
            },
    },

4、因为只能拿到当前分页的数据,无法拿到所有数据,使用watch监听了一下

    watch:{
            tableData:{
                handler (value) {
                    // 表格分页后的数据状态
                    if(this.currentChecked[(this.tablePage[1]-1)] == 'true'){
                        value.forEach(item=>{
                            this.$set(item, 'isSelect', true);
                        });
                        for(let key in this.allCheckedList){
                            if(key == this.tablePage[1]){
                                this.allCheckedList[this.tablePage[1]] = deepclone(value);
                            }
                        }
                        this.currentCheck = true;
                    } else {
                        for(let key in this.allCheckedList){
                            if(key == this.tablePage[1]){
                                if(this.allCheckedList[this.tablePage[1]].length !==0){
                                    this.allCheckedList[this.tablePage[1]].forEach(item =>{
                                        value.forEach(i=>{
                                           if(item.durrec_id == i.durrec_id){
                                               this.$set(i, 'isSelect', true);
                                           }
                                        })
                                    })
                                } else {
                                    value.forEach(item=>{
                                        this.$set(item, 'isSelect', false);
                                    })
                                }
                            }
                        }
                        this.currentCheck = false;
                    }
                    // 判断全选按钮
                    let allCheck = true;
                    this.currentChecked.forEach(checkFlag=>{
                        allCheck = allCheck && checkFlag == 'true'
                    })
                    this.allCheck = allCheck;
                    // 计算已选数量
                    this.checkSum();
                },
                deep:true
            },
            currentChecked:{
                handler(value){
                    if(value[(this.tablePage[1])-1] == 'true'){
                        this.tableData.forEach(item=>{
                            this.$set(item, 'isSelect', true);
                        })
                    } else {
                        this.tableData.forEach(item=>{
                            this.$set(item, 'isSelect', false);
                        })
                    }
                   this.checkSum();
                },
                deep:true
            },
        },

5、回传所有的已选数据,利用分页的请求又拿了一遍数据

          // 批量提醒
            allWarning(){
                if(this.allCheck){
                    axios({
                        method: "post",
                        url: "",
                        data: {
                            ajax: true,
                            act: "",
                            check:'T',
                        },
                    }).then((response) => {
                        let resp = response.data;
                        if (resp.su***ess) {
                           // ...
                        } else {
                            this.$message.error(resp.message);
                        }
                    }).catch(error=> {
                    });
                } else {
                    let choosedIdT = [];
                    let choosedIdF = [];
                    for(let i=0; i<this.currentChecked.length; i++){
                        if(this.currentChecked[i] == 'true'){
                            axios({
                                method: 'post', url: '',
                                data: {
                                    ajax: true, act: '', page: i+1,
                                }
                            }).then( response => {
                                let resp = response.data;
                                if(resp.su***ess){
                                    const pageList = deepclone(resp.list);
                                    pageList.forEach(item =>{
                                        choosedIdT.push(item.durrec_id);
                                    })
                                }else{
                                    Valert({msg:resp.message})
                                }
                            }).catch(error=> { });
                        } else {
                            this.allCheckedList[i+1].forEach(i=>{
                                choosedIdF.push(i.durrec_id);
                            })
                        }
                    }
                    setTimeout(()=>{
                        const ids = choosedIdT.concat(choosedIdF);
                        axios({
                            method: "post",
                            url: "/",
                            data: {
                                ajax: true,
                                act: "",
                                check:'F',
                                id:ids.join(","),
                            },
                            loading:{ target:".table"}
                        }).then((response) => {
                            let resp = response.data;
                            if (resp.su***ess) {
                                // ...
                            } else {
                                this.$message.error(resp.message);
                            }
                        }).catch(error=> { });
                    },300)
                }
            },

记录一些繁琐精巧的笨方法😉

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