Check if file (ClickOnce) exists using jQuery

Question

I am trying to find out whether or not a file exists, before trying to download it. The file is a ClickOnce application.

I have already tried the following code, but this does not work (maybe because the URL is on a different server and domain?);

$.ajax({

    url: 'http://www.example.com/somefile.ext',

    type: 'HEAD',

    error: function()

    {

        //File does not exist

    },

    success: function()

    {

        // File exists

    }

});

Is there another solution, or is there a means to get this one to work?

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Answer 1

Yes, this should not work if the URL is on a different server. If you want to make this work, you will need control over the server where the URL is downloaded from. If so, you should set the Access-Control-Allow-Origin header to the name of the server from which your JavaScript is loaded.

See Stack Overflow question jQuery AJAX cross domain for more details.

Check if file (ClickOnce) exists using jQuery

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