Question

I need to check wether a file exists in localStorage.

The filepath consists of

id.version

and I only have a the id value to test, which will be a 10 character string followed by the version which is of random length.

I’m used to checking for file existence server side using Coldfusion, where I can do something like this:

fileExists(expandPath(../some/path/to/a/file.*) )

where * would be any character.

Question:
Is something like this possible using regex, so I could test whether a file that contains the id parameter and any number of characters following the id exist? I don’t need to retrieve the file itself, just know if there is at least one with matching id in the path.

Thanks for help!

Answer 1

You can iterate over each localstorage item and get the key with the .key() method and check if that contains the id string etc. or use a regex to do something similar, Figuring out how to check the value and not the key, if that’s where the ID resides, should be trivial :

for (var i = 0; i < localStorage.length; i++){
    if ( localStorage.key(i).indexOf(id) != -1 ) {
        var item = localStorage.getItem(localStorage.key(i));
    }
}