How Uniapp keeps the keyboard from folding

Uniapp is a cross-platform development framework based on Vue.js, which can be used to create WeChat applets, H5 pages, APPs and other applications. During the development process, we may encounter situations where we need to enter large sections of text in the input box. However, when using the input box on the mobile phone, the keyboard will automatically retract after the input is completed, thus affecting the user's input experience. So, how to keep the keyboard from closing in Uniapp?

Uniapp provides a listening function called "input" event, which can monitor the user's input behavior in the input box in real time, and can respond to the input content in a timely manner. Using this feature, we can implement the function of keeping the keyboard from being folded.

The following are the specific steps to keep the keyboard from being closed:

1. Add the "@input" event listening function on the input box component, as shown below:

<template>
  <view>
    <input @input="onInput"/>
  </view>
</template>

2. Define the "onInput" function in the Vue instance to handle input events. Set the "focus" attribute of the input box to "true" in the function, as shown below:

<script>
  export default {
    data() {
      return {
        inputValue: ''    // 输入框的值
      }
    },
    methods: {
      onInput(event) {
        this.inputValue = event.target.value
        this.$nextTick(() => {
          event.target.focus()
        })
      }
    }
  }
</script>

In the function, first get the value of the input box through "event.target.value" and save it In the "inputValue" attribute in data for subsequent processing. Then, in the $input event, we use "$nextTick" to put the operation of setting the "focus" attribute of the input box in the asynchronous queue, and it will not be executed until the next DOM update cycle. Doing this ensures that the focus is set back to the input box after the content of the input box changes, thereby keeping the keyboard from being closed.

3. In H5 applications, CSS styles need to be added to prevent the input box from losing focus when selected. Add the following style to App.vue:

<style>
  input:focus {
    -webkit-user-select: auto!important;
    -moz-user-select: auto!important;
    -ms-user-select: auto!important;
    user-select: auto!important;
  }
</style>

Through the above steps, you can implement the function of keeping the keyboard from being closed in Uniapp. In practical applications, we can make adjustments according to specific business needs, such as keeping the input box out of focus when scrolling the page.

Of course, in addition to the above methods, there are also some other special scenarios that require special attention. For example, when you need to add a fixed bar above the keyboard, you also need to prevent the keyboard from being retracted without losing focus. In this case, we need to rely on third-party libraries or write native JS code ourselves to achieve it.

To sum up, Uniapp provides a wealth of APIs to meet the needs of developers. As long as you master the basic APIs and features, you can easily achieve various complex interactive effects.

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