微信小程序如何實(shí)現(xiàn)菜單左右聯(lián)動(dòng)效果

今天小編給大家分享一下微信小程序如何實(shí)現(xiàn)菜單左右聯(lián)動(dòng)效果的相關(guān)知識(shí)點(diǎn)，內(nèi)容詳細(xì)，邏輯清晰，相信大部分人都還太了解這方面的知識(shí)，所以分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后有所收獲，下面我們一起來了解一下吧。

原理

首先是獲取數(shù)據(jù)，并且獲取數(shù)據(jù)的長(zhǎng)度（需要根據(jù)長(zhǎng)度來計(jì)算元素的高度），通過遍歷數(shù)據(jù)的內(nèi)容通過題目和元素個(gè)數(shù)的相加得到高度，當(dāng)消失高度小于等于某個(gè)元素的高度就設(shè)定索引值給左邊的菜單目錄實(shí)現(xiàn)右邊滑動(dòng)左邊聯(lián)動(dòng)，左邊的菜單點(diǎn)擊事件聯(lián)動(dòng)比較簡(jiǎn)單就不說

代碼實(shí)現(xiàn)

wxml

<view class="menu">
        <view class="left-box">
            <scroll-view class="left_menu" scroll-with-animation  scroll-y="true" scroll-into-view="{{leftViewId}}">
                <text class="menu-item {{index==currentIndex?'menu-active':''}}" wx:for="{{navList}}" wx:key="this" data-id="menu{{index}}" data-i="{{index}}" bindtap="changeMenu">{{item.c_name}}</text>
            </scroll-view>
        </view>
        <view class="right-box">
            <scroll-view class="right_menu" scroll-y='true'  scroll-with-animation scroll-into-view="{{rightViewId}}"  bindscroll="getScroll" enable-flex>
                <view wx:for="{{navList}}" wx:key="this" class='pro-item' id="menu{{index}}">
                    <view class="right_menu_head">{{item.c_name}}</view>
                    <view class="list-box">
                        <view class="menu_list" wx:for-item='items' wx:for="{{item.list}}" wx:key="this">
                        <image src="{{items.url}}"></image>
                        <view>{{items.goodsName}}</view>
                    </view>
                </view>
                </view>
            </scroll-view>
        </view>
</view>

wxss，這里使用的是less語法，vscode插件可編譯

.menu{
    .left-box{
        width: 180rpx;
        border-right: 1px solid #dfdfdf;
        position: fixed;
        left: 0;
        z-index: 10;
        top: 370rpx;
        box-sizing: border-box;
        height: 90%;
        background: #f0f0f0;

        .menu-item{
            display: inline-block;
            width: 180rpx;
            height: 88rpx;
            font-size: 26rpx;
            line-height: 88rpx;
            background: #fff;
            text-align: center;
            border-bottom: 1px solid #dfdfdf;
        }

        .menu-active{
            background: #f0f0f0;
            border-left: 10rpx  solid #333999;
        }
    }
    
    .right-box{
        width: 74%;
        position: fixed;
        top: 360rpx;
        height: 77%;
        right: 0;
        border-left: 20rpx;
        box-sizing: border-box;
        margin-top: 20rpx;

        .right_menu{
            height: 100%;
            box-sizing: border-box;

            .pro-item{

                .right_menu_head{
                    height: 80rpx;
                    line-height: 80rpx;
                    font-size: 26rpx;
                    font-weight: 600;
                }

                &:last-child{
                    margin-bottom: 156rpx;
                }

                .list-box{
                    width: 100%;
                    // min-height: 380rpx;
                    display: flex;
                    flex-wrap: wrap;
                    background: #fff;
                    box-sizing: border-box;
                    border-radius: 10rpx;
                    font-size: 20rpx;

                    .menu_list{
                        width: 33.3%;
                        font-size: 20rpx;
                        padding: 20rpx 0;
                        text-align: center;
                        font-style: '微軟雅黑';

                        image{
                            width: 100rpx;
                            height: 100rpx;
                        }

                        view{
                            color: #333;
                            text-overflow: ellipsis;
                            white-space: nowrap;
                            overflow: hidden;
                          }
                    }
                }
            }
        }
    }
}

js文件

data:{
    navList:[..],//數(shù)據(jù)
    currentIndex: 0,//左邊對(duì)應(yīng)的索引
    rightViewId: '',//點(diǎn)擊事件右邊的索引
}

getScroll(e) {//微信小程序中綁定滑動(dòng)函數(shù)，每滑動(dòng)一下都會(huì)觸發(fā)
        let top = e.detail.scrollTop,
            h = 0,
            _this = this;


        for (let i = 0; i < this.data.navList.length; i++) {
            let dishSize = this.data.navList[i].list.length;//獲取數(shù)據(jù)對(duì)應(yīng)展示商品的json
            h += 38 + parseInt(dishSize / 3 * 80);//獲取當(dāng)前元素的高度，38是標(biāo)題高度，80是元素高度

            if (top <= h) {//滿足條件立刻停止循環(huán)，就會(huì)一直停留再當(dāng)前索引，不滿足當(dāng)前就會(huì)自動(dòng)到下一個(gè)菜單
                _this.setData({
                    currentIndex: i
                })
                break;
            }

        }

    },
    changeMenu(e) {
        console.log(this.data.heightArr, this.data.topArr);

        this.setData({
            currentIndex: e.currentTarget.dataset.i,
            rightViewId: e.currentTarget.dataset.id
        })

    }

展示圖片

以上就是“微信小程序如何實(shí)現(xiàn)菜單左右聯(lián)動(dòng)效果”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家閱讀完這篇文章都有很大的收獲，小編每天都會(huì)為大家更新不同的知識(shí)，如果還想學(xué)習(xí)更多的知識(shí)，請(qǐng)關(guān)注億速云行業(yè)資訊頻道。