Vue.js與ElementUI搭建無限級聯(lián)層級表格組件

前言

今天,回老家了。第一件事就是回家把大屏安排上,寫作的感覺太爽了,終于可以專心地寫文章了。我們今天要做的項目是怎么樣搭建一個無限級聯(lián)層級表格組件,好了,多了不多說,趕快行動起來吧!
項目一覽

到底是啥樣子來?我們來看下。













正如你所看到的那樣,這個組件涉及添加、刪除、編輯功能,并且可以無限級嵌套。那么怎樣實現(xiàn)的?我們來看下。
源碼

直接給出源碼,就是這么直接。

<template>
    <div class="container">
        <el-button
            type="primary"
            size="small"
            @click="handleCreate"
            icon="el-icon-circle-plus-outline"
            style="margin: 10px 0"
            >添加</el-button
        >
        <el-table
            :data="tableData"
            style="width: 100%; margin-bottom: 20px"
            border
            row-key="value"
            stripe
            size="medium"
            :tree-props="{ children: 'children' }"
        >
            <el-table-column prop="label" label="標簽名稱"> </el-table-column>
            <el-table-column prop="location" label="層級"> </el-table-column>
            <el-table-column label="操作" :align="alignDir" width="180">
                <template slot-scope="scope">
                    <el-button
                        type="text"
                        size="small"
                        @click="handleUpdate(scope.row)"
                        >編輯</el-button
                    >
                    <el-button
                        type="text"
                        size="small"
                        @click="deleteClick(scope.row)"
                        >刪除</el-button
                    >
                </template>
            </el-table-column>
        </el-table>
        <el-dialog
            :title="textMap[dialogStatus]"
            :visible.sync="dialogFormVisible"
            width="30%"
        >
            <el-form
                ref="dataForm"
                :rules="rules"
                :model="temp"
                label-position="left"
                label-width="120px"
                style="margin-left: 50px"
            >
                <el-form-item
                    label="層級:"
                    prop="location"
                    v-if="dialogStatus !== 'update'"
                >
                    <el-select
                        v-model="temp.location"
                        placeholder="請選擇層級"
                        @change="locationChange"
                        size="small"
                    >
                        <el-option
                            v-for="item in locationData"
                            :key="item.id"
                            :label="item.name"
                            :value="item.id"
                        />
                    </el-select>
                </el-form-item>
                <el-form-item
                    v-if="sonStatus && dialogStatus !== 'update'"
                    label="子位置:"
                    prop="children"
                >
                    <el-cascader
                        size="small"
                        :key="isResouceShow"
                        v-model="temp.children"
                        placeholder="請選擇子位置"
                        :label="'label'"
                        :value="'value'"
                        :options="tableData"
                        :props="{ checkStrictly: true }"
                        clearable
                        @change="getCasVal"
                    ></el-cascader>
                </el-form-item>
                <el-form-item label="標簽名稱:" prop="label">
                    <el-input
                        v-model="temp.label"
                        size="small"
                        autocomplete="off"
                        placeholder="請輸入標簽名稱"
                    ></el-input>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogFormVisible = false" size="small">
                    取消
                </el-button>
                <el-button
                    type="primary"
                    size="small"
                    @click="
                        dialogStatus === 'create' ? createData() : updateData()
                    "
                >
                    確認
                </el-button>
            </div>
        </el-dialog>
    </div>
</template>

<script>
export default {
    name: 'Tag',
    data() {
        return {
            alignDir: 'center',
            textMap: {
                update: '編輯',
                create: '添加',
            },
            dialogStatus: '',
            dialogFormVisible: false,
            temp: {},
            isResouceShow: 1,
            sonStatus: false,
            casArr: [],
            idx: '',
            childKey: [],
            rules: {
                location: [
                    {
                        required: true,
                        message: '請選擇層級',
                        trigger: 'blur',
                    },
                ],
                label: [
                    { required: true, message: '請輸入名稱', trigger: 'blur' },
                ],
                children: [
                    {
                        required: true,
                        message: '請選擇子位置',
                        trigger: 'blur',
                    },
                ],
            },
            locationData: [
                {
                    id: '1',
                    name: '頂',
                },
                {
                    id: '2',
                    name: '子',
                },
            ],
            tableData: [
                {
                    tagId: '1', // 標簽id
                    label: '第0', // 標簽名稱
                    parent: '', // 父級名稱
                    location: '1', // 層級
                    value: '0', // 標識位
                    children: [
                        {
                            tagId: '1', // 子標簽id
                            childKey: ['0', '0'], // 子標識位
                            label: '第0-0',
                            parent: '第0',
                            location: '2',
                            value: '0-0',
                            children: [],
                        },
                        {
                            tagId: '2', // 子標簽id
                            childKey: ['0', '1'],
                            label: '第0-1',
                            parent: '第0',
                            location: '2',
                            value: '0-1',
                            children: [],
                        },
                    ],
                },
            ]
        };
    },
    methods: {
        // 遞歸尋找同級
        findSameTable(arr, i, casArr) {
            if (i == casArr.length - 1) {
                return arr;
            } else {
                return this.findTable(
                    arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
                    (i += 1),
                    casArr
                );
            }
        },
        // 尋找父級
        findTable(arr, i, casArr) {
            if (i == casArr.length - 1) {
                let index = casArr[i].substr(casArr[i].length - 1, 1);
                return arr[index];
            } else {
                return this.findTable(
                    arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
                    (i += 1),
                    casArr
                );
            }
        },
        // 遞歸表格數(shù)據(jù)(添加)
        find(arr, i) {
            if (i == this.casArr.length - 1) {
                return arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]
                    .children;
            } else {
                return this.find(
                    arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]
                        .children,
                    (i += 1)
                );
            }
        },
        // 遞歸表格數(shù)據(jù)(編輯)
        findSd(arr, i, casArr) {
            if (i == casArr.length - 1) {
                let index = casArr[i].substr(casArr[i].length - 1, 1);
                return arr.splice(index, 1, this.temp);
            } else {
                return this.findSd(
                    arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
                    (i += 1),
                    casArr
                );
            }
        },
        // 遞歸尋找同步名稱
        findLable(arr, i, casArr) {
            if (i == casArr.length - 1) {
                let index = casArr[i].substr(casArr[i].length - 1, 1);
                return arr[index];
            } else {
                return this.findLable(
                    arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
                    (i += 1),
                    casArr
                );
            }
        },
        // 同步子名稱
        useChildLable(arr) {
            if (arr !== []) {
                arr.forEach((item) => {
                    item.parent = this.temp.label;
                });
            }
        },
        // 遞歸表格數(shù)據(jù)(刪除)
        findDel(arr, i, item) {
            let casArr = item.childKey;
            if (i == casArr.length - 2) {
                let index = casArr[i].substr(casArr[i].length - 1, 1);
                arr[index].children.forEach((it, ix, arrs) => {
                    if (it == item) {
                        return arrs.splice(ix, 1);
                    }
                });
            } else {
                return this.findDel(
                    arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
                    (i += 1),
                    item
                );
            }
        },
      // 置空
        resetTemp() {
            this.temp = {};
        },
      // 打開添加
        handleCreate() {
            this.resetTemp();
            this.dialogFormVisible = true;
            this.dialogStatus = 'create';
            this.$nextTick(() => {
                this.$refs['dataForm'].clearValidate();
            });
        },
      // 添加
        createData() {
            this.$refs['dataForm'].validate((valid) => {
                if (valid) {
                    if (this.sonStatus == false) {
                        this.temp.value = String(this.tableData.length);
                        const obj = Object.assign({}, this.temp);
                        obj.children = [];
                        obj.parent = '';
                        this.tableData.push(obj);
                        this.$message({
                            type: 'success',
                            message: '添加成功',
                        });
                        this.dialogFormVisible = false;
                    } else {
                        let arr = this.find(this.tableData, 0);
                        this.temp.value =
                            String(this.casArr[this.casArr.length - 1]) +
                            '-' +
                            String(arr.length);
                        delete this.temp.children;

                        const obj = Object.assign({}, this.temp);
                        obj.children = [];
                        obj.childKey = [...this.casArr, String(arr.length)];
                        obj.parent = this.findTable(
                            this.tableData,
                            0,
                            this.casArr
                        ).label;
                        if (this.temp.location === '2') {
                            obj.location = String(
                                [...this.casArr, String(arr.length)].length
                            );
                        }
                        arr.push(obj);
                        this.$message({
                            type: 'success',
                            message: '添加成功',
                        });
                        this.dialogFormVisible = false;
                    }
                } else {
                    return false;
                }
            });
        },
      // 打開更新
        handleUpdate(row) {
            console.log(row);
            row.value.length != 1
                ? (this.sonStatus = true)
                : (this.sonStatus = false);
            this.temp = Object.assign({}, row); // copy obj
            if (row.childKey) {
                this.childKey = row.childKey;
                this.idx = row.childKey[row.childKey.length - 1];
            } else {
                this.idx = row.value;
            }
            console.log(this.idx);

            this.dialogStatus = 'update';
            this.dialogFormVisible = true;
            this.$nextTick(() => {
                this.$refs['dataForm'].clearValidate();
            });
        },
      // 更新
        updateData() {
            this.$refs['dataForm'].validate((valid) => {
                if (valid) {
                    if (this.temp.location === '1') {
                        console.log(this.temp);
                        this.tableData.splice(this.idx, 1, this.temp);
                        this.useChildLable(this.tableData[this.idx].children);
                        this.$message({
                            type: 'success',
                            message: '編輯成功',
                        });
                        this.dialogFormVisible = false;
                    } else {
                        this.findSd(this.tableData, 0, this.childKey);
                        this.useChildLable(
                            this.findLable(this.tableData, 0, this.childKey)
                                .children
                        );
                        this.$message({
                            type: 'success',
                            message: '編輯成功',
                        });
                        this.dialogFormVisible = false;
                    }
                } else {
                    return false;
                }
            });
        },
        // 刪除父級節(jié)點
        deleteParent(item) {
            this.tableData.forEach((it, ix, arrs) => {
                if (it == item) {
                    return arrs.splice(ix, 1);
                }
            });
        },
        // 刪除
        deleteClick(item) {
            this.$confirm(`此操作將刪除該標簽, 是否繼續(xù)?`, '提示', {
                confirmButtonText: '確定',
                cancelButtonText: '取消',
                type: 'warning',
            })
                .then(() => {
                    if (item.children.length != 0) {
                        this.$message.warning({
                            message: '請刪除子節(jié)點',
                            duration: 1000,
                        });
                    } else {
                        ++this.isResouceShow;
                        if (item.value.length == 1) {
                            this.deleteParent(item);
                            this.$message({
                                type: 'success',
                                message: '刪除成功',
                            });
                        } else {
                            this.findDel(this.tableData, 0, item);
                            this.$message({
                                type: 'success',
                                message: '刪除成功',
                            });
                        }
                    }
                })
                .catch((err) => {
                    console.log(err);
                    this.$message({
                        type: 'info',
                        message: '已取消刪除',
                    });
                });
        },
        // 是否顯示次位置
        locationChange(v) {
            if (v == 2) {
                this.sonStatus = true;
            } else {
                this.sonStatus = false;
            }
        },
        // 獲取次位置
        getCasVal(v) {
            this.casArr = v;
        },
    },
};
</script>

   
   
   
      
代碼可以直接拿來用,但是要注意事先要安裝下ElementUI框架。無限層級的核心算法是遞歸算法,掌握了這一點,任何難題都可以解決。

下面,我們就這個項目來回顧下前端中的遞歸算法。

遞歸簡而言之就是函數(shù)調(diào)用自己。遞歸算法中有兩個條件:基線條件和遞歸條件?;€條件用于控制遞歸啥時候暫停,而遞歸條件是控制調(diào)用自己的方式。

最簡單的一個例子是5的階乘。

var func = function(i){
    if(i === 1){
        return 1;
    }else{
        return i*func(i-1);
    }

}
func(5);

  

這樣就很簡單的實現(xiàn)了一個遞歸算法,我們將上述例子拆解下。

// 遞
5*func(4);
5*4*func(3);
5*4*3*func(2);
5*4*3*2*func(1);
// 歸
5*4*3*2*1;
5*4*3*2;
5*4*6;
5*24;
120



遞歸其實可以理解成兩個操作遞與歸??梢赃@樣比喻,比如你在做一道數(shù)學題時,有一個知識點你不懂,你需要查資料。但是,通過查資料你發(fā)現(xiàn)這個知識點中你又有另一個不明白的知識點,你又開始繼續(xù)查,直到你沒有不懂的知識點,這樣遞的操作已經(jīng)完成。然后,你把已經(jīng)查過的這些知識點又從尾到頭復習了一遍,這樣歸的操作已經(jīng)完成。最后,你明白了最初那個知識點。

作者:Vam的金豆之路

主要領(lǐng)域:前端開發(fā)

我的微信:maomin9761

微信公眾號:前端歷劫之路