vue與ant-tree結(jié)合偽造懶加載并可以查詢

更新時(shí)間：2023年07月03日 14:02:36 作者：忘れられたくない

這篇文章主要為大家介紹了vue與ant-tree結(jié)合偽造懶加載并可以查詢實(shí)現(xiàn)示例詳解，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪

構(gòu)造原因

ant-tree異步加載數(shù)據(jù)查詢之后，節(jié)點(diǎn)不支持再次請(qǐng)求數(shù)據(jù)，直接渲染全部節(jié)點(diǎn)后，數(shù)據(jù)量特別大（生成dom進(jìn)行操作），會(huì)造成瀏覽器卡頓

思路：

1、switcherIcon重寫(xiě)自定義樹(shù)節(jié)點(diǎn)的展開(kāi)/折疊圖標(biāo)

2、通過(guò)loaded狀態(tài)判斷是否完成了懶加載，當(dāng)懶加載進(jìn)行時(shí)，用loading狀態(tài)更改圖標(biāo)

3、每次懶加載之后，給數(shù)據(jù)新建一個(gè)空的子節(jié)點(diǎn)，進(jìn)行偽造懶加載（只有節(jié)點(diǎn)下有孩子節(jié)點(diǎn)時(shí)，才會(huì)有圖標(biāo)）

view視圖

<a-input-search @search="onSearch" v-model.trim="searchStr"></a-input-search>
<a-tree
    @select="onSelect"
    :selectedKeys="selectedKeys"
    :treeData="treeData"
    :expandedKeys="expandedKeys"
    @expand="changeExpand"
    :replaceFields="{key:'id',title:'title',children:'children'}"
        >
    <template slot="switcherIcon" slot-scope="{loading}">
        <a-icon type="caret-down" v-if="loading"></a-icon>
        <a-icon type="loading" v-else></a-icon>
    </template>
    <template slot="title" slot-scope="{title}">
        <span v-html="
          title 
          ? title.replace(
            new RegExp(replaceKeywords,g),
            '<span style=color:#f50>'+title+'</span>'
            )
          : null"
        ></span>
    </template>
</a-tree>

加載樹(shù)

loadingData為最后展開(kāi)的一層節(jié)點(diǎn)，方便首次加載默認(rèn)展開(kāi)層級(jí)

async loadTree(treeId,treeNode,isSearch){
    let params={treeId}
    let [err,res] = await loadTree(params);
    if(!err){
        if(res.result.code == 200){
            //存在樹(shù)節(jié)點(diǎn)
            if(treeId){
                treeNode.dataRef.children = this.getUpdateTree(res.result.data);
                this.treeData = [...this.treeData];
                this.loadingData = res.result.data
            }else{
                if(isSearch){
                    this.treeData = res.result.data;
                    this.expandedKeys = [];
                    this.getAllKey(this.treeData)
                }else{
                    this.treeData = this.getUpdateTree(res.result.data);
                    if(!this.treeData.length){return;}
                    //首次加載默認(rèn)加載到第四層
                    this.expandedKeys = []
                    this.initTree(this.treeData,1,4)
                }
            }
        }
    }
}

initTree 初始化循環(huán)樹(shù)

默認(rèn)展示到第幾層

async initTree(treeData,index,maxLevel){
    if(index > maxLevel || !treeData.length){return};
    treeData.map(item=>{
        if(item.childrenIds.length){
            let initLoaded = item.loaded;
            item.loaded = true;
            item.loading = true;
            let data = {dataRef:item}
            if(initLoaded){
                index++;
                treeData = item.children
                this.initTree(treeData,index,maxLevel);
                item.loading = false;
                this.expandedKeys.push(item.id);
                return;
            }
            setTimeOut(
                async ()=>{
                    let returnData = await this.onLoadData(data);
                    if(returnData.length){
                        index++;
                        treeData = this.loadingData;
                        this.initTree(treeData,index,maxLevel);
                        item.loading = false;
                        this.expandedKeys.push(item.id);
                    }
                },
                initLoaded ? 0 :100
            )
        }
    })
}

onLoadData：懶加載

onLoadData(treeNode){
    return new Promise(resolve=>{
        setTimeout(()=>{
            treeNode.dataRef.loading = false;
            resolve(this.loadTree(treeNode.dataRef.id,treeNode))
        },10)
    })
}

getUpdateTree：添加一個(gè)空數(shù)組，偽造懶加載

getUpdateTree(data){
    data.map(item=>{
        if(存在子節(jié)點(diǎn)){
            item.children = [{}]
        }
    })
}

getAllKey：獲取樹(shù)節(jié)點(diǎn)所有的key

getAllKey(data){
    data.map(item=>{
        this.expandedKeys.push(item.id);
        if(item.children){
            this.getAllKey(item.children)
        }
    })
}

onSearch：搜索

onSearch(){
    this.expandedKey = []
    this.searchKeywords = this.searchStr;
    //替換特殊字符
    this.replaceKeywords = this.searchStr.split("\\").join("\\\\");
    this.replaceKeywords = this.replaceKeywords.split("[").join("\\[");
    this.replaceKeywords = this.replaceKeywords.split("]").join("\\]");
    this.replaceKeywords = this.replaceKeywords.split("$").join("\\$");
    this.replaceKeywords = this.replaceKeywords.split("^").join("\\^");
    this.replaceKeywords = this.replaceKeywords.split("*").join("\\*");
    this.replaceKeywords = this.replaceKeywords.split("(").join("\\(");
    this.replaceKeywords = this.replaceKeywords.split(")").join("\\)");
    this.replaceKeywords = this.replaceKeywords.split("+").join("\\+");
    this.replaceKeywords = this.replaceKeywords.split("|").join("\\|");
    this.replaceKeywords = this.replaceKeywords.split("?").join("\\?");
    this.loadTree("","",true)
}

changeExpand：點(diǎn)擊判斷是否異步加載

changeExpand(event,node){
    if(node.node.dataRef.loaded){
        this.expandedKeys = event;
        return;
    }
    node.node.dataRef.loading = true;//添加懶加載效果
    node.node.dataRef.loaded = true;//當(dāng)點(diǎn)擊時(shí)，表示已經(jīng)加載
    this.onLoadData(node.node);
    this.expandedKeys = event
}

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