How uniapp monitors keyboard height

As mobile applications continue to develop, user experience is becoming more and more important. In order to improve user experience, developers must understand the various situations that users may encounter during use of the application. One of them is the keyboard that pops up when entering text. On mobile devices, the height of the keyboard can have a significant impact on what users view, especially if the application requires a lot of text input. Therefore, knowing how to monitor keyboard height has become one of the necessary skills.

Uniapp is a framework tool for developing cross-platform applications. It provides a way to achieve cross-platform development and deploy applications on multiple application platforms. It supports multiple frameworks like VueJS and React and leverages web technologies to develop applications. Uniapp is becoming more and more popular due to its development framework and cross-platform nature. This article explains how to monitor keyboard height in a Uniapp application.

The necessity of monitoring keyboard height

On mobile devices, the height of the keyboard is dynamic. When the user enters text, the keyboard pops up and then closes when the input is complete. In this process, the screen area occupied by the keyboard will affect other elements in the application. If keyboard height is not taken into account, the application may experience UI issues.

In the Uniapp application, monitoring the keyboard height can achieve the following functions:

1. Adjust the application layout to ensure that the element being edited is not covered when the keyboard pops up.
2. Prevent users from being able to view other parts of the application while typing.
3. Allows the application to perform corresponding operations based on the status of the keyboard, such as popping up additional input boxes.

Method to detect keyboard height

In Uniapp, to detect the keyboard height, you can use the uni.getSystemInfo and uni.onWindowResize functions. The uni.getSystemInfo function can be used to obtain device and operating system information and provide the screen height value on the device. And uni.onWindowResize can be used to send events to the application when the window size changes.

The following is a code example for monitoring the keyboard height in Uniapp:

uni.getSystemInfo({
  success: function (res) {
    var totalHeight = res.windowHeight;
    uni.onWindowResize(function(res) {
      var currentHeight = res.size.windowHeight;
      if(totalHeight - currentHeight > 50) {// 假设高度差值大于50，可以根据实际情况进行调整
        // 键盘弹起了
        // 可以执行相应的操作，例如调整布局
      } else {
        // 键盘收回了
        // 可以执行相应的操作，例如还原布局
      }
    });
  }
})

In this example, we obtain the totalHeight of the device screen and use uni.onWindowResize to monitor the Keyboard pop-up and Recall events. When the keyboard pops up, the height of the current window is reduced, and the difference between the current height and the original height is the height of the keyboard. In the code, we define the keyboard height as 50 pixels. If the current height value is less than the total height value, we assume that the keyboard has popped up and perform the corresponding operation.

Notes on monitoring keyboard height

Although it is very simple to implement monitoring keyboard height in Uniapp, there are still some precautions that need to be followed to ensure good performance and user experience of the application:

1. Pay attention to the calculation of keyboard height values ​​to determine whether the height value in a specific case is applicable to all devices and operating systems.
2. Only monitor the keyboard height when the user actually starts typing. Outdated codes waste system resources and may result in longer response times.
3. After the keyboard is closed, necessary cleanup operations must be performed to avoid potential problems in the application.

The above is a brief introduction on how to monitor keyboard height in Uniapp application. By monitoring keyboard height, Uniapp can achieve a better user experience. However, we still need to handle it with care and follow best practices and considerations to ensure application performance and user satisfaction.

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