JSZip：检查 zip 文件夹是否包含特定文件

Question

I currently have the following code:

zip.folder("courses").forEach(function (relativePath, file) {
    if (!file.dir) {
        promises.push(zip.file(file.name).async("string"));
    }
});

But I believe this assumes that the zip contains the "courses" folder, how do I check whether or not the zip contains a "courses" folder before the forEach loop? Thanks!

Answer 1

You can use a regex with the function folder() like:

var zip = new JSZip();    
if(zip.folder(/courses/).length > 0) {
    // Folder exists
} else {
    // Folder doesn't exist
}

folder() returns an array, see the documentation . It is possible with file() too.

Answer 2

For a specific file, you can try by the file name like following way.

var zip = new JSZip();
...................
if(zip.file(/csv/).length > 0 ){
  // Do something
} 
else if(zip.file(/pdf/).length > 0) {
  // Do something 
}