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小程序如何制作商品列表流式布局

2020-09-27|HiShop
導(dǎo)讀：很多商城小程序中，一般的商品列表是以流式布局方式展示，下面為大家介紹小程序如何制作商品列表流式布局？...

很多商城小程序中，一般的商品列表是以流式布局方式展示，下面為大家介紹小程序如何制作商品列表流式布局？

小程序如何制作商品列表流式布局

流式布局概念

流式布局也叫百分比布局
把元素的寬,高,margin,padding不再用固定數(shù)值,改用百分比,
這樣元素的寬,高,margin,padding會(huì)根據(jù)頁(yè)面的尺寸隨時(shí)
調(diào)整已達(dá)到適應(yīng)當(dāng)前頁(yè)面的目的.

先看效果：
小程序如何制作商品列表流式布局

如上圖所示，為了能夠看的更直觀一點(diǎn)我給布局設(shè)置了紅色虛線邊框，整體頁(yè)面根據(jù)元素的百分比進(jìn)行布局。
直接看代碼：

xxx.wxml

<scroll-view scroll-y="true" style="height:{{scrollH}}px" bindscrolltolower="loadImages">
  <view class="goods" style="width:100%">
    <view class="mg_item">
      <view wx:for="{{col1}}" wx:key="id">
      <view class="item_info">
        <image src="{{item.imageurl}}" style="width:100%;height:{{item.height}}px"></image>
      </view>
            <view class="product-name">
              {{item.name}}
            </view>
            <view class="product-price-wrap">
              <p class="product-price-new">￥{{item.newprice}}</p>  
              <p class="product-price-old">￥{{item.oldprice}}</p> 
               <p class="discount">{{item.discount}}折</p>   
            </view>
      </view>
    </view>
    <view class="mg_item">
      <view wx:for="{{col2}}" wx:key="id">
      <view class="item_info">
        <image src="{{item.imageurl}}" style="width:100%;height:{{item.height}}px"></image>
      </view>
            <view class="product-name">
              {{item.name}}
            </view>
            <view class="product-price-wrap">
              <p class="product-price-new">￥{{item.newprice}}</p>  
              <p class="product-price-old">￥{{item.oldprice}}</p> 
               <p class="discount">{{item.discount}}折</p>   
            </view>
      </view>
    </view>
  </view>
</scroll-view>
 <view style="display:none">
  <image wx:for="{{images}}" wx:key="id" id="{{item.id}}" src="{{item.imageurl}}" bindload="onImageLoad"></image>
</view>

通過(guò)查看class標(biāo)簽發(fā)現(xiàn)有兩個(gè)img_item ，所以采取的是左右分別加載數(shù)據(jù)方式。

xxx.js


Page({

  data: {
    scrollH: 0,
    imgWidth: 0,
    loadingCount: 0,
    images: [],
    col1: [],
    col2: []
  },

  onLoad: function () {
    wx.getSystemInfo({
      success: (res) => {
        let ww = res.windowWidth;
        let wh = res.windowHeight;
        let imgWidth = ww * 0.48;
        let scrollH = wh;

        this.setData({
          scrollH: scrollH,
          imgWidth: imgWidth
        });

        //加載首組圖片
        this.loadImages();
      }
    })
  },

  onImageLoad: function (e) {
    let imageId = e.currentTarget.id;
    let oImgW = e.detail.width;         //圖片原始寬度
    let oImgH = e.detail.height;        //圖片原始高度
    let imgWidth = this.data.imgWidth;  //圖片設(shè)置的寬度
    let scale = imgWidth / oImgW;        //比例計(jì)算
    let imgHeight = oImgH * scale;      //自適應(yīng)高度

    let images = this.data.images;
    let imageObj = null;

    for (let i = 0; i < images.length; i++) {
      let img = images[i];
      if (img.id === imageId) {
        imageObj = img;
        break;
      }
    }

    imageObj.height = imgHeight;

    let loadingCount = this.data.loadingCount - 1;
    let col1 = this.data.col1;
    let col2 = this.data.col2;

    //判斷當(dāng)前圖片添加到左列還是右列
    if (col1.length <= col2.length) {
      col1.push(imageObj);
    } else {
      col2.push(imageObj);
    }

    let data = {
      loadingCount: loadingCount,
      col1: col1,
      col2: col2
    };

    //當(dāng)前這組圖片已加載完畢，則清空?qǐng)D片臨時(shí)加載區(qū)域的內(nèi)容
    if (!loadingCount) {
      data.images = [];
    }

    this.setData(data);
  },

  loadImages: function () {
    let images = [
      {
        goodId: 0,
        name: '泊爾崖蜜蜜光面膜（5片盒裝）',
        url: 'bill',
        imageurl: 'https://a3.vimage1.com/upload/merchandise/pdcvis/2017/08/21/142/fb2960bf8e074d029c24315279289c19-5_218x274_70.jpg',
        newprice: "86",
        oldprice: "88",
        discount: "8.8",
        height: 0, 
      },
      {
        goodId: 1,
        name: '透無(wú)瑕礦物養(yǎng)護(hù)兩用粉餅#03',
        url: 'bill',
        imageurl: 'https://a.appsimg.com/upload/brand/upcb/2017/10/26/77/ias_150899004322921_604x290_80.jpg!75.webp',
        newprice: "147.00",
        oldprice: "150.00",
        discount: "8.8",
        height: 0,
      },
      {
        goodId: 2,
        name: '川水水光面膜（5片盒裝）',
        url: 'bill',
        imageurl: 'https://a2.vimage1.com/upload/merchandise/pdcvis/2017/08/21/86/7891361fdab348a1bc91aeca31fc77b1-5_218x274_70.jpg',
        newprice: "86.00",
        oldprice: "88.00",
        discount: "8.8",
        height: 0, 
      },
      {
        goodId: 3,
        name: '蜜三色漸變咬唇膏3.2g 03蜜橙動(dòng)心戀',
        url: 'bill',
        imageurl: 'http://a3.vimage1.com/upload/merchandise/pdcvis/2017/08/21/176/c3b9453a4d7f46c6a8fe78705f77352b-5_218x274_70.jpg',
        newprice: "97.00",
        oldprice: "99.00",
        discount: "8.8",
        height: 0,
      },
      {
        goodId: 4,
        name: '時(shí)煥顏亮采套裝',
        url: 'bill',
        imageurl: 'https://a2.vimage1.com/upload/merchandise/pdcvis/2017/08/21/93/69a6bc1c11eb4be184b7dffb43b8565b-5_218x274_70.jpg',
        newprice: "398.00",
        oldprice: "459.00",
        discount: "8.8",
        height: 0,
      }
    ];

    let baseId = "img-" + (+new Date());

    for (let i = 0; i < images.length; i++) {
      images[i].id = baseId + "-" + i;
    }

    this.setData({
      loadingCount: images.length,
      images: images
    });
  }

})

如下代碼：
**if (col1.length <= col2.length) {
col1.push(imageObj);
} else {
col2.push(imageObj);
}**
檢索商品集合根據(jù)高度分別放入兩個(gè)集合中。

xxx.wxss

page{  
  height: 100%;  
  background-color: #F3F4F6;
} 
/* 單個(gè)圖片容器的樣式 */
.img_item {
  width: 48.5%;
  margin: 2px;
  display: inline-block;
  vertical-align: top;
  background-color: #ffffff;
  font-size: 24rpx;

}
.item_info{
  border-top:1px dashed red;
}
.product-name{
  color: #000;
  /* height: 28px; */
  text-align:left;
   margin: 0px 5px; 
   margin-bottom: 5px; 
}
.product-price-wrap .product-price-new{
  color: #e80080;
  margin-left:5px;
  font-weight:900;
}
.product-price-wrap .product-price-old{
  color: #888;
  text-decoration: line-through;
  padding-left: 2px;
}
.product-price-wrap .discount{
  margin-left: 30px;
  background-color: #000;
  color: #fff;
}

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小程序如何制作商品列表流式布局

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