retrieve boolean value of checkbox jquery/html

I have a webserver running, which has a page containing a checkbox, what I need is to retrieve the state of the checkbox to show it in a popup, but I don't know how to do.

Here is the piece of my code that doesn't work:

'<fieldset class="field">',
                          ' <label for="jqxcheckboxvalue">${translator("value").title()}:</label>',
                          ' <input type="checkbox" name="value" id="jqxcheckboxvalue" ' +
                          'value='+$('#jqxcheckboxvalue').val()+'>',
                          '</fieldset>'

How can I get the state of the checkbox? Thank you