jquery - HTML5: How to count the length of the files from the multiple-input field

Question

How can I use jquery to count the length of the files from the multiple-input field?

alert($('#myForm input[type=file]').files.length);
<input type="file" multiple="multiple" name="file[]"/>

error:

$("#myForm input[type=file]").files is undefined

It works find with plain js but I don't want to use ID in my input field.

alert(document.getElementById('file').files.length);

<input type="file" multiple="multiple" name="file[]" id="file"/>

Answer 1

Try getting the native DOM element using the .get method:

$('#myForm input[type=file]').get(0).files.length

Note however that if you have multiple DOM elements matching your selector this will return the first one and if you have none it will obviously throw an exception.