How do I disable/enable a form element? You can enable or disable a form element using the .prop() method: 1 2 3 4 5 // Disable #x$( "#x" ).prop( "disabled", true ); // Enable #x$( "#x" ).prop( "disabled", false ); How do I select an element by an ID that has characters used in CSS notation? How do I check/uncheck a checkbox input or radio button?