Refer below code and change it as per your need, Make sure you mark client callable true on script include
Client script:
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}
var ga = new GlideAjax("userDetailsUtil");// Script include name
ga.addParam('sysparm_name', 'getUserDetails');//Script include function name
ga.addParam('sysparm_usersysid', newValue);// newValue object in onchange client script always return changed value of the field
ga.getXML(getDetails);//Calling call back function to convert response and set values
function getDetails(response) {//call back function
var answer = response.responseXML.documentElement.getAttribute("answer");
var objval = JSON.parse(answer);
g_form.setValue("u_department",objval.department);
alert(objval.department);
}
}
Script include:
var userDetailsUtil = Class.create();
userDetailsUtil.prototype = Object.extendsObject(AbstractAjaxProcessor, {
getUserDetails:function(){//Function declaration
var obj = {};//json to collect the information
var usersysid = this.getParameter('sysparm_usersysid');
var gr=new GlideRecord('sys_user');//glide user table
gr.get(usersysid);
obj.email=gr.getValue('email');//map values
obj.department=gr.getValue('department');
var json = new JSON();
return json.encode(obj);
},
type: 'userDetailsUtil'
});
