在iOS 6上以编程方式触发文件输入对话框

Question

How can I trigger a select file dialog on iOS 6 for an input element in the DOM programatically? (ie using Javascript)

<input type="file" id="foo">

Notes:

• Mobile Safari and Safari seems to behave differently. I've got it working using document.querySelector("input[type=file]").click() in safari.
• If it's within a native clickhandler, ie initiated by the user, it seems to work, but I'd like to trigger the dialog on will.

Answer 1

After some more research it seems like this isn't possible. Least I haven't found a method that works.

I decided to solve this using an <input type='file'> positioned on top of the button, with opacity 0.01 to make the button visible.