Create input select image URL?

By Javascript you can pop-up the media and on select you can update the image URL to the textbox. Below is the code.

var custom_uploader;
jQuery('<Should-be-a-button-selector>').click(function(e) {
    e.preventDefault();
    //If the uploader object has already been created, reopen the dialog
    if (custom_uploader) {
        custom_uploader.open();
        return;
    }

    //Extend the wp.media object
    custom_uploader = wp.media.frames.file_frame = wp.media({
        title: 'Choose Image',
        button: {
            text: 'Choose Image'
        },
        multiple: false
    });

    //When a file is selected, grab the URL and set it as the text field's value
    custom_uploader.on('select', function() {
        attachment = custom_uploader.state().get('selection').first().toJSON();
        jQuery('#Cat_meta[img]').val(attachment.url);


    //Open the uploader dialog
    custom_uploader.open();
});