Scriptinclude

Script Includes/GetCallerDetails/Calling Script Include from client.js

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+   if (isLoading || newValue === '') {
+      return;
+   }
+   var aj = new GlideAjax("GetCallerDetails");  // This is the name of script include, as per the name of your requirement.
+   aj.addParam('sysparm_name',"demoTest");  // This is calling a defined function in script include.
+   aj.addParam('sysparm_caller_id',g_form.getValue('caller_id')); // getting a caller_id
+   aj.getXML(callback);
+   function callback(response){  // creating a callback function to store the response getting from script include.
+	var answer = response.responseXML.documentElement.getAttribute('answer');
+	alert(answer); // This will alert the details.
+   }
+
+}

Script Includes/GetCallerDetails/Readme.md

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+This script include will help to get the details of caller Id_name like (email, first_name, last_name user_name etc.) mentioned in incident form with the help of on change client script by iniating a Ajax call.

Script Includes/GetCallerDetails/scriptinclude.js

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+var GetCallerDetails = Class.create(); // This will create a new class.
+GetCallerDetails.prototype = Object.extendsObject(AbstractAjaxProcessor, {
+	demoTest:function(){
+		var caller = this.getParameter('sysparm_caller_id');  // this will make the instance for caller id
+		var user = new GlideRecord('sys_user');
+		user.addQuery('sys_id',caller); // This will query the parameter, if exist
+		user.query();
+		if(user.next()){  // If user found
+			return "Email Id: " + user.email + "\n" + "First Name " + user.first_name + "\n" + "Last Name: " + user.last_name + "\n" + "User Id: " + user.user_name;
+		}
+	},
+
+    type: 'GetCallerDetails'
+});