WeChat applet implements pull-down refresh effect

WeChat applet implements pull-down refresh effect

As a lightweight mobile application development platform, WeChat applet has gained widespread popularity in the mobile application industry in recent years. application and development. Pull-down refresh is a common interactive effect. It can automatically refresh the content when the user pulls down the page in the list page, improving user experience and timely updating of data. This article will introduce how to implement the pull-down refresh effect in WeChat applet and provide specific code examples.

1. Add a pull-down refresh component
   First, add a pull-down refresh component to the .wxml file of the page where you need to add a pull-down refresh effect. You can add a custom pull-down refresh area at the top of the page to display pull-down refresh animations and prompt information. The code example is as follows:

<!-- index.wxml -->
<view class="container">
  <!-- 页面内容 -->
</view>

<view class="refresh" hidden="{{!isRefreshing}}">
  <text class="text">{{refreshText}}</text>
  <image class="icon" src="/images/refresh.png"></image>
</view>

2. Set the data related to the pull-down refresh
   In the .js file of the page, you need to set the relevant data and event processing functions related to the pull-down refresh first. Here is an example:

// index.js
Page({
  data: {
    isRefreshing: false, // 是否正在刷新
    refreshText: '下拉刷新', // 下拉刷新文字提示
  },

  // 下拉刷新事件
  onPullDownRefresh: function () {
    if (this.data.isRefreshing) {
      return;
    }
    this.setData({
      isRefreshing: true,
      refreshText: '正在刷新...'
    });

    // 模拟异步请求数据
    setTimeout(() => {
      // 更新数据
      // ...

      this.setData({
        isRefreshing: false,
        refreshText: '下拉刷新'
      });
      wx.stopPullDownRefresh(); // 停止下拉刷新
    }, 1500);
  }
})

3. Add drop-down refresh style and animation effect
   You can add interactivity and beauty to the drop-down refresh effect through CSS styles and animations. Add the following style to the .wxss file of the page:

/* index.wxss */
.container {
  /* 页面内容样式 */
}

.refresh {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50px;
  font-size: 14px;
  color: #999;
}

.text {
  margin-right: 10px;
}

.icon {
  width: 20px;
  height: 20px;
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

4. Operating effects and precautions
   Through the above three steps, we have completed the pull-down refresh in the WeChat applet Realization of effects. The user can trigger the refresh by pulling down on the page, and monitor the refresh action through the onPullDownRefresh event to achieve timely update of data.

It should be noted that the onPullDownRefresh event can only take effect in pages with a pull-down refresh style. If the backgroundColor, backgroundTextStyle and navigationBarBackgroundColor of the page are not set, the pull-down refresh will be invalid. In addition, when the refresh is completed, the wx.stopPullDownRefresh() function needs to be called to stop the pull-down refresh, otherwise the page will remain refreshed.

Summary
This article explains in detail how to achieve the pull-down refresh effect in the WeChat applet by introducing four steps. By adding a pull-down refresh component, setting relevant data and event processing functions, and adding styles and animation effects, you can easily implement the pull-down refresh function and improve the user experience. I hope this article can help you achieve the pull-down refresh effect in WeChat applet development.

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