Instructions on how to use JavaScript to retrieve the selected file from a file dialog box

For creating a file dialog box using JavaScript, I utilized the following code:

var input = $(document.createElement('input'));
input.attr("type", "file");
input.trigger('click');

The file dialog box displays correctly with this code.

If a file is selected using the Open button on the File Dialog box, how can I capture the file name and other details?

I aim to upload the selected file to a server using an ajax request once it has been selected. Here are some of the methods I have attempted to detect when the Open button is clicked, but they have not yielded any results. Any recommendations?

input.onchange = function(e) {
alert("File Selected"); 
};  

input.onclick = function(e) {
alert("File Selected");
};

Answer №1

file inputs come with a special property called files. Accessing them is simple, especially if you've set the multiple attribute:

var files = input.files;

According to the MDN documentation:

The files property of the HTML <input> element returns an object of this type, allowing you to retrieve the list of files selected with the <input type="file"> element. It is also employed for managing a list of files dragged and dropped into web content using the drag and drop API; refer to the DataTransfer object for more details on this feature.

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