/*
 * Adapted from: http://mikejolley.com/2012/12/using-the-new-wordpress-3-5-media-uploader-in-plugins/
 */
jQuery(document).ready(function ($) {
// Uploading files
    var file_frame;

    $('.custom-profile-picture-remove').on('click', function (event) {
        $('#user_meta_image').val('');
        $('#submit').click();
    });

    $('.custom-profile-picture').on('click', function (event) {

        event.preventDefault();

        // If the media frame already exists, reopen it.
        if (file_frame) {
            file_frame.open();
            return;
        }

        // Create the media frame.
        file_frame = wp.media.frames.file_frame = wp.media({
            title: $(this).data('uploader_title'),
            button: {
                text: $(this).data('uploader_button_text')
            },
            multiple: false  // Set to true to allow multiple files to be selected
        });

        // When an image is selected, run a callback.
        file_frame.on('select', function () {
            // We set multiple to false so only get one image from the uploader
            attachment = file_frame.state().get('selection').first().toJSON();

            // Do something with attachment.id and/or attachment.url here
            $('#user_meta_image').val(attachment.url);
            $('.current-profile-picture').attr('src', attachment.url);
        });

        // Finally, open the modal
        file_frame.open();
    });

});
/*
 * Adapted from: http://mikejolley.com/2012/12/using-the-new-wordpress-3-5-media-uploader-in-plugins/
 */
jQuery(document).ready(function ($) {
// Uploading files
    var file_frame;

    $('.custom-profile-picture-remove').on('click', function (event) {
        $('#user_meta_image').val('');
        $('#submit').click();
    });

    $('.custom-profile-picture').on('click', function (event) {

        event.preventDefault();

        // If the media frame already exists, reopen it.
        if (file_frame) {
            file_frame.open();
            return;
        }

        // Create the media frame.
        file_frame = wp.media.frames.file_frame = wp.media({
            title: $(this).data('uploader_title'),
            button: {
                text: $(this).data('uploader_button_text')
            },
            multiple: false  // Set to true to allow multiple files to be selected
        });

        // When an image is selected, run a callback.
        file_frame.on('select', function () {
            // We set multiple to false so only get one image from the uploader
            attachment = file_frame.state().get('selection').first().toJSON();

            // Do something with attachment.id and/or attachment.url here
            
            $('#user_meta_image').val(attachment.id);
            $('.current-profile-picture').attr('src', attachment.url);
        });

        // Finally, open the modal
        file_frame.open();
    });

});
Return attachment ID instead of URL