How to solve the problem that the uniapp keyboard automatically disappears after popping up

In the process of using uniapp to develop mobile applications, we often encounter the problem that the keyboard cannot be automatically hidden after it pops up. This not only affects the user experience, but also affects the stability of the application. Therefore, in this article, we will introduce how to solve the problem of uniapp keyboard automatically disappearing after popping up.

1. Principle of uniapp input box

In uniapp, we use the input component or textarea component to implement the text input function. Both components have a key attribute called adjust-position, which controls whether the input box automatically moves up when the keyboard pops up to ensure that the user can see the input content.

When this property is set to auto (default value), the input box will automatically move up according to the keyboard pop-up height. When this property is set to none, the input box will not move up, and the user needs to manually scroll the screen to view the input content.

2. The timing of the keyboard popping up

In uniapp, when the user clicks on the input box or textarea, the keyboard will pop up automatically. However, if we need to control the pop-up of the keyboard through code in the program, we need to use the API provided by uniapp.

For example, when we need to pop up the keyboard directly under certain circumstances, we can achieve this through the following code:

uni.showKeyboard({
  showType: 0,
  placeholder: '请输入内容',
  success: function () {
    console.log('键盘弹出成功');
  }
});

It should be noted that after calling the above API, the keyboard will cover the input box , and the adjust-position attribute will not be triggered. In this case, the position of the input box needs to be manually set.

3. Solving the problem of the keyboard automatically disappearing

When the keyboard pops up, many users will find that the keyboard will disappear automatically. This is because in some cases, the operating system will automatically determine whether the current pop-up keyboard is legal and close it if it is illegal.

For example, when entering a password, when the user enters an incorrect password multiple times in succession, the operating system will determine that the current input behavior is illegal (possibly a hacker attack) and automatically close the keyboard to prevent delinquenent conduct.

In order to solve the problem of the keyboard automatically disappearing, we can prevent the event from bubbling and stop the default behavior by adding the touchstart event to the page. Taking the input component as an example, the code is as follows:

<template>
  <input type="text" placeholder="请输入内容" @touchstart="stopEvent" />
</template>

<script>
export default {
  methods: {
    stopEvent(e) {
      e.stopPropagation();
      e.preventDefault();
    }
  }
};
</script>

In this way, when the user clicks on the input box, the touchstart event will be captured and prevent bubbling and default behavior, so that the operating system cannot determine whether the current input behavior is legal. You won't accidentally close the keyboard.

4. Conclusion

In this article, we introduced the principle of the uniapp input box and how to control the pop-up of the keyboard through API. At the same time, we also introduced the problem of the keyboard automatically disappearing when it pops up and how to solve it through the touchstart event. I hope this article can help everyone use uniapp to develop mobile applications.

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