Open blob objectURL in Chrome

问题:

I want to open a PDF in a new tab in chrome browser (Chrome 56.0.2924.87, Ubuntu 14.04) using window.open(fileObjectURL) in javascript. I am creating the blob from base64 encoded data and do create an objectURL like this:

const fileObjectURL = URL.createObjectURL(fileBlob); 

It works fine in latest Firefox browser. But in Chrome I can see that the new tab gets opened but then closed immediately. So I don't get any error in the console etc. The only way it works in Chrome now is to give the base64 data directly to the window.open(fileBase64Data) function. But I don't like the complete data being set in the url.

Maybe this is a safety issue with Chrome blocking opening of blobs?

回答1:

The cause is probably adblock extension (I had exactly the same problem).

回答2:

You must open new window before you put blob url in window:

let newWindow = window.open('/')

Also you can use some another page like /loading, with loading indicator.

Then you need to wait newWindow loading, and you can push url of your blob file in this window:

newWindow.onload = () => {
    newWindow.location = URL.createObjectURL(blob);
};

Adblock extension don't block it.

I'm using it with AJAX and ES generators like this:

let openPDF = openFile();
openPDF.next();
axios.get('/pdf', params).then(file => {
  openPDF.next(file);
});

function* openFile() {
  let newWindow = window.open('/pages/loading');
  // get file after .next(file)
  let file = yield;
  // AJAX query can finish before window loaded,
  // So we need to check document.readyState, else listen event
  if (newWindow.document.readyState === 'complete') {
    openFileHelper(newWindow, file);
  } else {
    newWindow.onload = () => {
      openFileHelper(newWindow, file);
    };
  }
}

function openFileHelper(newWindow, file) {
  let blob = new Blob([file._data], {type: `${file._data.type}`});
  newWindow.location = URL.createObjectURL(blob);
}