输入上的keyup事件不起作用

Question

In my code, both chrome and jsfiddle, find no errors, but while running it, it doesn't alerts anything.

my code is: js:

$("input#photoimg").on('keyup', function () {
    alert('key up');
});

html:

<input type="file" name="file" id="photoimg">

jsfiddle: http://jsfiddle.net/58nxY/1/

Answer 1

For file inputs, use the change event:

$("input#photoimg").on('change', function () {
    alert('file added/changed');
});

Updated fiddle

Answer 2

Keyup仅适用于文本输入，但是在文件和文档处理中，您需要触发“ change”事件。