using ui action we need to create a button state to move closed

[BheemavarapuTej]

Using UI actions, we must create a button state to move to the closed list level. Once I select the record, it should be updated to close.

[Gangadhar Ravi]

You can follow this docs 

https://docs.servicenow.com/bundle/xanadu-it-service-management/page/product/incident-management/tas...

OR

you can do a simple UI action like below image 

Please mark my answer correct and helpful if this works for you.

[BheemavarapuTej]

It looks like you've written, "This code didn't work. I wrote a new code, and it's working correctly now."

function actionOK() {

    var sysId = g_list.getChecked();

    var inc = new GlideAjax('IncidentClosure');

    inc.addParam('sysparm_name', 'closeIncidents');

    inc.addParam('sysparm_incidents', sysId);

    inc.getXML(serverData);

    function serverData(response) {

        var answer = response.responseXML.documentElement.getAttribute("answer");

        if (answer === 'true') {

            alert("short_description changes");

        } else {

            alert("Failed to close incidents");

        }

    }

}

var IncidentClosure = Class.create();

IncidentClosure.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    closeIncidents: function() {

        var selectedIncidents = this.getParameter("sysparm_incidents");

        var incidentGr = new GlideRecord('incident');

        incidentGr.addQuery('sys_id', 'IN', selectedIncidents);

        incidentGr.query();

        while (incidentGr.next()) {

            incidentGr.setWorkflow(false);

            incidentGr.setValue('short_description','test');

            incidentGr.setValue('state',2);

            incidentGr.update();

        }

        return true;

    },

    type: 'IncidentClosure'

});