uniapp develops Ele.me WeChat applet home page sticky sticky positioning layout

Position: Sticky is a new attribute of CSS, which means sticky positioning. It is mainly used to monitor the scroll event. During the sliding process, the distance between an element and its parent element reaches sticky. When required (for example, add the style position:sticky; top:20px to the red box in the picture below); then the red box scrolls upward and will be fixed to the appropriate position when the distance from the parent element reaches 20px, The effect is the perfect combination of relative and fixed.

This new attribute has a wide range of applications. Everyone likes to learn from good things~ For example, in the homepage layout of the Ele.me WeChat applet, the search box The element uses sticky layout. How is it implemented? Let’s take a look at the overall effect first (as shown below, you can also open the Ele.me WeChat applet to experience it~).

Template code:

            <template>
                <!-- 粘性定位搜索盒子 -->
				<view class="search-box" :style="{top:top+&#39;px&#39;}">
					<view class="ctn">
						<view class="hx-search-box" @click="goSearch">
							<view class="hx-search-text">
								<uni-icons type="search" size="22" 
								color="#666666" />
								<text>鲜果大咖水果捞 20减12</text>
							</view>
							<view>
								<button class="search-txt">搜索</button>
							</view>
						</view>
					</view>
				</view>
			</template>

Note: The dynamic attribute top is added to the search-box box here , This is because on the mini program side, the distance between the search box and the specific parent element changes on different mobile devices. How to find the dynamic top attribute value?

    <script>
        export default {
            data() {
			return {
			//在这里给到top属性一个默认的值为0
			    top: 0
			}
	     },
	     onLoad() {
			// 获取手机系统信息 状态栏高度 
			const statusBarHeight = uni.getSystemInfoSync().statusBarHeight
			// 获取胶囊的位置
			const menuButtonInfo = uni.getMenuButtonBoundingClientRect()
		    //导航栏的高度 = (胶囊底部高度 - 状态栏的高度) + (胶囊顶部高度 - 状态栏内的高度) 
		    this.navBarHeight = (menuButtonInfo.bottom - info.statusBarHeight) + 
		                        (menuButtonInfo.top - info.statusBarHeight)
		      //top的值为状态栏的高度+导航栏的高度
			this.top = menuButtonInfo.bottom + menuButtonInfo.top - statusBarHeight;
		    } 
        }
    </script>
    <style>
        .search-box {
        		position: sticky;
        		z-index: 2;
    </style>

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