What should I do if uniapp closes the page when selecting pictures?

When developing mobile applications using uniapp, we often need to let users select pictures and upload them to the server. However, in the process of implementing this function, many developers will encounter a problem: after the user selects the picture, the page will be closed, causing the user to be unable to continue the operation.

So, why does this happen? How to solve this problem? This article will introduce in detail the reasons and solutions for why selecting pictures in uniapp will close the page.

1. Cause Analysis

When users select pictures in uniapp, they usually use the uni.chooseImage() API officially provided by uniapp. The API will call the local photo album or photo function to allow the user to select or take one or more pictures.

However, after selecting or taking a picture, the uniapp application will not return to the original page by default, but will directly close the album or photo page, which leads to the problem of "selecting a picture will close the page" question.

This is because the uni.chooseImage() API is an asynchronous API, which creates a new page during the process of the user selecting or taking a picture. After the user completes the selection or shooting action, the page will be closed directly, and the event loop of uniapp has ended at this time, making it impossible to continue to perform other operations.

2. Solution

In order to solve the problem that selecting an image will close the page, we can use another API provided by uniapp: uni.getImageInfo(). This API can obtain image information, such as image width, height, type, etc. After selecting the image, we can obtain the image information through this API and display it on the current page, thereby avoiding the page being closed.

The following is a specific example that demonstrates how to implement the function of selecting images and displaying them on the current page through the uni.getImageInfo() API.

<template>
  <view>
    <image :src="imgUrl" mode="aspectFit" />
    <button @tap="chooseImage">选择图片</button>
  </view>
</template>
<script>
export default {
  data() {
    return {
      imgUrl: ''  // 用于保存选择的图片地址
    }
  },
  methods: {
    chooseImage() {
      uni.chooseImage({
        count: 1,
        success: (res) => {
          const tempFilePaths = res.tempFilePaths[0]
          // 调用getImageInfo()获取图片信息
          uni.getImageInfo({
            src: tempFilePaths,
            success: (res) => {
              this.imgUrl = tempFilePaths
            }
          })
        }
      })
    }
  }
}
</script>

In this example, after selecting the image, we call uni.getImageInfo() API to obtain the image information and assign it to the imgUrl variable in data. Then, we bind the variable to the src attribute of the img element in the page through the v-bind instruction, thereby realizing the function of displaying the selected image on the current page.

It should be noted that although this method can prevent the page from closing, the page created by selecting or taking pictures may still occupy certain system resources and may cause problems such as memory leaks. Therefore, we recommend that after using the function of selecting or taking pictures, you should either close the page directly or use the method of cleaning up the memory to release resources to ensure the stability and robustness of the program.

This article introduces the reasons and solutions for why selecting pictures in uniapp will close the page. By using the uni.getImageInfo() API to obtain image information and display it on the current page, we can avoid the page being closed and better improve the user experience and stability of the program.

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