How can I programmatically open the file picker with JavaScript? [duplicate]

Answer 1

For security reasons you can't trigger the dialog, unless it is as a response to some user triggered event. You could for instance trigger the dialog through a click on some other element:

$(function () {
    $(".someElement").click(function () {
        $('#f').click();
    });
});

Working example.

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Answer 2

As a security measure, you can only open such dialogs on an user input, such as a click event (on whatever element). You cannot open it randomly such as on page load.

http://jsfiddle.net/fEBFp/2/