How to open the thought map pdf of postgraduate entrance examination in the small program of postgraduate entrance examination question bank

How to open the thought map of postgraduate entrance examination in the small program of postgraduate entrance examination question bank pdf

demand ： Meet such a demand , Postgraduate entrance examination question bank applet , To solve the pain point of sharing learning materials , We need to build a database , Therefore, it is necessary to open the thought map of postgraduate entrance examination materials pdf The function of .

problem ： Use... In wechat applet web-view open pdf, IOS It can be opened normally ,Android Open as blank .

solve ： Use wx.downloadFile and wx.openDocument. adopt downloadFile Get file path ( The local path ), And then use openDocument Open a new page to open a document .

wx.downloadFile(Object object)

Function description

Download file resources to local . The client directly initiates a HTTPS GET request , Return the local temporary path of the file ( The local path ), The maximum number of files allowed for a single download is 200MB. Please read the relevant instructions before use .

Be careful ： Please respond on the server header Reasonable specified in Content-Type Field , To ensure that the client handles file types correctly .

Return value

An object that can listen for download progress change events and cancel downloading .

Implementation code

wx.downloadFile({
  url: 'https://.../XXX.pdf', // Just for the sample , Not real resources 
  success (res) {
    //  As long as the server has response data , It will write the response to the file and enter the  success  Callback , The business needs to decide whether it has downloaded the desired content 
    if (res.statusCode === 200) {

    }
  }
  fail (err) {
    console.log(err); // Failure 
  }
})

wx.openDocument(Object object)

Function description

Open a new page to open a document . File path ( The local path ) , It can be done by downloadFile get .

Implementation code

wx.openDocument({
  fileType: 'pdf', //  file type 
  filePath: Path, // The file path to open 
  success: function (res) {
    console.log(' open  PDF  success ');
  }
})

Realization effect