question Looking for more use cases of servicenow Scripting in Community Central forum

I wrote this just for the change of the Good field. However you probably would also want this for the fast and cheap fields. That means you would need to also add scripts for those scenarios. This is one of the drawbacks of client scripts.

Client Script: Good onChange

When: onChange

onChange of field: u_good

Script:

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   //If the form is loading or the new value of the changing field is empty exit the script
   if (isLoading || newValue == '') {
      return;
   }
   //If Good is true, cheap is true, and fast is true, good luck
   if(newValue == 'true' && g_form.getValue('u_cheap') == true && g_form.getValue('u_fast') == true) {
      //Set the result field on the form.
      g_form.setValue('u_result', 'They are dreaming');
   }
   //repeat for the other scenarios
   else if (newValue == 'true' && g_form.getValue('u_cheap') == true && g_form.getValue('u_fast') == false) {
      g_form.setValue('u_result', 'Will take time to deliver');
   }
  else if (newValue == 'false' && g_form.getValue('u_cheap') == true && g_form.getValue('u_fast') == true) {
      g_form.setValue('u_result', 'Not the best quality');
  }
  else {
      g_form.setValue('u_result', 'Who knows');
  }
}

Example 2: Open Dialog Window :

I have a good example of a client script opening a GlideDialog window here .

I am just going to show the client script part. In this example, a window pops up on form load

Client Script: SNE Message

function onLoad() {
 //Call a UI Page to Display on load.You have to create the UI Page separately
 var gDialog = new GlideDialogWindow('sne_message');
 gDialog.setTitle('ServiceNowElite.com Message');
 gDialog.setSize(700,700);
 gDialog.render();
}

Example 3: Color Code Approval Buttons :

I use this one often. Color code the approval buttons so that they are easier to notice.

It is tempting to use this for many color changes in ServiceNow. How use Field Styles instead as much as possible.

Client Script: Approval Button Color

When: onLoad

Script:

function onLoad() {
 var approveButton = document.getElementById('approve');
 var rejectButton = document.getElementById('reject');
 if (approveButton) {
approveButton.style.background='green';
approveButton.style.color='white';
 }
 if (rejectButton) {
rejectButton.style.background='red';
rejectButton.style.color='white';
 }
}

Example 4: Verify a phone number :

Before ServiceNow version Dublin was released, I used this to verify a phone number format. Dublin has new phone number fields .

However it is a good example of regex function. If you are not familiar with regular expressions, here are some explanations of what regular expressions .

Client Script: Verify Number

Type: onChange

Field: u_phone_number

Script:

function onChange(control, oldValue, newValue, isLoading) { 
 if (isLoading || newValue == '') {
return;
 }
 var tempValue = newValue;
 //Use Regular Expressions to verify number
 var phoneRegex1 = /^\d{3}-\d{3}-\d{4}$/;
 var phoneRegex2 = /^(800|866|877)/;
 var phoneRegex3 = /^(1{3}-1{3}-1{4}|2{3}-2{3}-2{4}|3{3}-3{3}-3{4}|4{3}-4{3}-4{4}|5{3}-5{3}-5{4}|6{3}-6{3}-6{4}|7{3}-7{3}-7{4}|8{3}-8{3}-8{4}|9{3}-9{3}-9{4}|0{3}-0{3}-0{4})$/;
 
 if (tempValue.match(phoneRegex1) && !tempValue.match(phoneRegex2) && !tempValue.match(phoneRegex3)) {
return;
 }
 else {
g_form.setValue('mobile_number', '');
alert('Phone number must be in format XXX-XXX-XXXX and must not start with 800, 866, or 877.');
 }
}

Example 5: Alert :

Pop an alert to the screen if a value is true

Client Script: Awesome Check

Type: onChange

Field: u_awesome_check

Script:

function onChange(control, oldValue, newValue, isLoading) {
 if (isLoading || newValue == '') {
return;
 }
 if (newValue == 'mike_awesome') {
alert('Yes this is true');
 }
}

Example 6: Adjust Slush Bucket Sizes :

There is a good example of adjusting slush bucket sizes from the forums.

function onLoad(){
 var varName = 'YOUR_VARIABLE_NAME_HERE';
 var height = '10'; //Optional
 var width = '250'; //Optional
 //Get the left and right bucket input elements
 var leftBucket = $(varName + '_select_0');
 var rightBucket = $(varName + '_select_1');
 if(height && g_form.getControl(varName)){
//Adjust the bucket length (default is 18)
leftBucket.size = height;
rightBucket.size = height;
 }
 if(width && g_form.getControl(varName)){
//Adjust the bucket width (default is 340)
leftBucket.style.width = width;
rightBucket.style.width = width;
 }
 //Fix the expanding item preview issue
 $(varName + 'recordpreview').up('td').setAttribute('colSpan', '3');
}

Example 7: Callback Function :

Callback functions make JavaScript far more flexible than it would be otherwise.

Typical functions work by taking arguments as input and returning a result. Functions take an input and return an output.
Javascript callback functions are different. Instead of waiting for a function to return that result, you can use a callback to do this asynchronously. This not only helps with performance, it strongly encouraged to use callback functions and asynchronous programming.

Example: without a callback (don't do this) :

Client Script: Set VIP

When: onChange

Field: caller_id

function onChange(control, oldValue, newValue, isLoading) {
 var caller = g_form.getReference('caller_id');
 if (caller.vip == 'true')
alert('Caller is a VIP!');
}

Example: with a callback (recommended)

Client Script: Set VIP

When: onChange

Field: caller_id

function onChange(control, oldValue, newValue, isLoading) {
 var caller = g_form.getReference('caller_id', doAlert); // doAlert is our callback function
}
function doAlert(caller) { //reference is passed into callback as first arguments
if (caller.vip == 'true')
alert('Caller is a VIP!');
}

Example 8: GlideRecord Query :

To learn all about client script GlideRecord queries. These are limited glide record queries you can use to make server-side database queries. They use callback functions to do this. I always suggest using business rules instead for these, but sometimes I can't convince people to do that.

It is better to use a GlideAjax query than a GlideRecord query. There is a good example in the wiki for that.

Client Script: Set Version

On Change Table: Configuration Item

Field Name: Product

Script:

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

var gr = new GlideRecord('cmdb_ci');
 gr.addQuery('sys_id', newValue);
 gr.query(setVersion);
}

function setVersion(gr) {
 if (gr.next()) { 
 g_form.setValue('version', gr.u_version);
}
}

Example 9: Remove Option from Choice List :

This is an easy client script. Remove a value from a choice list if something is set.

Client Script: Category Inquiry Remove Impact 1

When: onChange

Field: Category

Script:

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

if (isLoading || newValue == '') {
return;
}
if (newValue == 'inquiry') {
g_form.removeOption('impact', '1');
}
}

If my response helped mark as helpful and accept the solution.

Re: Looking for more use cases of servicenow Scripting

Aditya_hublikar — Fri, 15 May 2026 18:05:01 GMT

Hello @sanjay8613 ,

You can refer following thread for client script :
https://www.servicenow.com/community/servicenow-studio-forum/client-script-realtime-scenarios/m-p/3503382#M6028

this for server side script :

https://www.servicenow.com/community/itsm-forum/scripting-practice-question/td-p/3529846

Mix client + server:

https://www.servicenow.com/community/itsm-forum/scenarios-of-client-script-server-script/td-p/3412258

If this helps you then accept as solution and mark it as helpful.

Regards,

Aditya

Re: Looking for more use cases of servicenow Scripting

Aditya_hublikar — Fri, 15 May 2026 18:05:31 GMT

Hello @sanjay8613 ,

You can refer following thread for client script :
https://www.servicenow.com/community/servicenow-studio-forum/client-script-realtime-scenarios/m-p/3503382#M6028

this for server side script :

https://www.servicenow.com/community/itsm-forum/scripting-practice-question/td-p/3529846

Mix client + server:

https://www.servicenow.com/community/itsm-forum/scenarios-of-client-script-server-script/td-p/3412258

If this helps you then accept as solution and mark it as helpful.

Regards,

Aditya

Re: Looking for more use cases of servicenow Scripting

Srikanth_9 — Sun, 17 May 2026 11:23:39 GMT

Hi @sanjay8613,

Yes, you can find a lot of real-time scenarios-based & problem-solving questions in the Community itself.

Refer the below links:

Client Script - ServiceNow Community.

Give me couple of examples for each type of clie... - ServiceNow Community.

On-Change Client Side Scripting Scenarios - ServiceNow Community.

Client Script in ServiceNow With some use case. - ServiceNow Community.

A Developer's Guide to ServiceNow Catalog Client S... - ServiceNow Community.

Real-time scenarios - Scripting - Part 1 - ServiceNow Community.

Refer YouTube for more scenarios and practice them in the PDI.

If the provided solution is useful/working, please Accept as Solution and hit the Helpful.

Thanks & Regards,

Srikanth Akula.

Re: Looking for more use cases of servicenow Scripting

Aditya_hublikar — Mon, 18 May 2026 07:28:49 GMT

Hello @sanjay8613 ,

I hope you are doing well . Does my response helps you ?

If my response helps you then mark it as helpful and accept as solution.

Regards,

Aditya

Re: Looking for more use cases of servicenow Scripting

quintinmorrow — Wed, 20 May 2026 10:40:59 GMT

The callback function example is something a lot of beginners skip over and then wonder why their scripts cause performance issues. GlideAjax over client-side GlideRecord is genuinely worth drilling into early — once you get comfortable with async patterns in ServiceNow, the whole scripting side clicks into place much faster. The PDI is your best friend for testing all these scenarios without breaking anything real.