WeChat applet implements image preview function

WeChat applet is a lightweight application that can be used directly in WeChat and has the advantages of cross-platform and easy operation. During the development process, we often encounter the need to implement the image preview function. This article will give a specific code example to teach you how to implement the image preview function in the WeChat applet.

First, we need to introduce components into the WeChat applet page. Add the following code in the wxml file:

<image src="{{imageUrl}}" mode="widthFix" bindtap="previewImage"></image>

In the js file, we need to define the logic of image preview. The code is as follows:

Page({
  data: {
    imageUrl: ''  // 图片的链接
  },
  previewImage: function(event) {
    wx.previewImage({
      current: this.data.imageUrl,  // 当前显示图片的链接
      urls: [this.data.imageUrl]  // 需要预览的图片链接列表
    })
  }
})

In this code, we call the previewImage method provided by the WeChat applet in the bindtap event. The current parameter specifies the currently displayed image link, and the urls parameter specifies the list of image links that need to be previewed. When the user clicks on the image, a pop-up window for image preview will appear.

Next, we need to add some styles to the image. Add the following code to the wxss file:

image {
  width: 100%;
  height: auto;
}

The function of this code is to set the width of the image to 100% and the height to automatically adjust.

The above is the specific code example to implement the image preview function of the WeChat applet. When users click on a picture, they can see a preview pop-up window and browse more pictures. This function is very simple, but very practical and very common during the development process.

It should be noted that the permissions must be set in the applet's configuration file app.json to allow the use of the <image></image> tag and the wx.previewImage method. The specific code is as follows:

{
  "permission": {
    "scope.userLocation": {
      "desc": "用于图片预览功能"
    }
  }
}

The above is the entire content of this article. I hope it will be helpful for everyone to understand and master the implementation of the image preview function in the WeChat applet. If you have any questions, you can leave a message in the comment area and I will try my best to help answer them.

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