How to solve the problem of blank space at the bottom of the page after the uniapp h5 keyboard is hidden

When developing H5 web pages, we often encounter the situation where a blank appears at the bottom of the page after the keyboard pops up. This is also a problem that often occurs in uniapp. This article will introduce you how to solve the problem of blank bottom of the page after the uniapp H5 keyboard is hidden.

1. Problem Analysis

On mobile devices, when the keyboard pops up, the elements that originally occupied the bottom will be pushed up. If no processing is performed on the page at this time, a message will appear. Blank areas bring a bad experience to users. This problem will also occur in uniapp, because uniapp supports both H5 and mini programs, so it needs to be processed for different platforms.

2. Solution

For different platforms, we need to solve this problem through different methods.

1. H5 Platform

On the H5 platform, the solution is relatively simple. We only need to monitor the pop-up and retract events of the keyboard. When it pops up, it will occupy the bottom Just move the element up. For example:

// 获取元素和屏幕高度
const input = document.querySelector("input");
const screenHeight = window.innerHeight;
 
// 监听键盘弹出事件
input.addEventListener("focus", () => {
  // 上移元素
  input.style.transform = `translateY(-${screenHeight / 2}px)`;
});
 
// 监听键盘收起事件
input.addEventListener("blur", () => {
  // 恢复元素位置
  input.style.transform = "translateY(0px)";
});

2. mini program platform

On the mini program platform, we need to use the wx.pageScrollTo() method to implement page scrolling. For example:

// 获取元素和屏幕高度
const input = document.querySelector("input");
const screenHeight = wx.getSystemInfoSync().windowHeight;
 
// 监听键盘弹出事件
wx.onKeyboardHeightChange((res) => {
  // 计算元素需要上移的高度
  const scrollTop = res.height - screenHeight / 2;
  // 滚动页面
  wx.pageScrollTo({ scrollTop });
});

3. Summary

Through the above methods, we can easily solve the problem of blank space at the bottom of the page after the uniapp H5 keyboard is hidden. However, it should be noted that in actual projects, we may need to make some adjustments and optimizations to the code based on specific circumstances to achieve a better user experience.

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