ServiceNow Client Script Tutorial With Examples | Client Script in ServiceNow

Article provide complete understanding of Client Script in ServiceNow with Example. Understanding of all types of  ServiceNow Client Script along with examples has been give. You will also find practical video demonstration of client scripts which will help you understand the required concept completely.

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In this ServiceNow tutorial we will explore client script in ServiceNow. In ServiceNow there are lots of client side programming areas such as Client Script, UI Policy, UI macro, UI script, UI Action, UI Page etc., But In this article we will discuss only about client script in ServiceNow.

Below are client script concepts which we will discuss in this article:
  • What is ServiceNow Client Script?
  • Different Types of ServiceNow Client Script with examples?
  • Detailed understanding of each and every type of client script?
  • Which get execute first client script or UI policy?

Below is the information which I am sharing as per my understanding and I hope below article of service development training series will help you to understand ServiceNow client script basic concepts.

So, let’s start….

Client Script in ServiceNow with Examples:

Client Script means scripts (java script) which runs on client side or on client browser. Let have some generic practical examples:

  • We all have Gmail account right, when we do not enter any value at login window and click on sign in button. Then what happens, it display some error message right. 
  • Let’s have another example from ServiceNow, when we create new incident and click on submit button without filling any value, then error messages displayed to us right. Error message such as requester is blank, short description is empty right. 

Basically  from above examples, I want to say that ServiceNow Client Script is used for validation purpose, to make field read only, to make fields hidden, to make fields mandatory, populate value on static value on the field, to display informational message, for generate popup on button click or on page load etc., remove or add values in dropdowns, auto populating the field etc. There are lots of many functionalities which is taken care by client scripts in ServiceNow. 

So, whatever script we write in client script area will get execute on the client-side means end user will directly face it at the interface interaction which means when he will fill the form, when a page is loaded, when a form is modified and when the form is submitted.
I hope above explanation will clear you doubts.


Different Types of ServiceNow Client Script with examples:

There are four types of client scripts:

  • onload()
  • onChange()
  • 0nSubmit()
  • onCellEdit()
so let’s understand all these types of client script and there execution in details:

onload() Client Script:

So the code written in onload() client script area will get executed, when the form is loaded and before the user have entered any input or data in the form. For e.g. 
You click on create new incident link and incident form gets loaded In front of you, which contains some pre-populated values in fields like requester name, short description, requester email id etc. 
So, the same functionality mentioned above in example you can also develop by yourself using onload() client script.

  • let say if you want to display pop up message with some information to user when the form loads then you can write code over onload() client script area.
  • let's say you want logged in user name is requester field when the form gets load, then you can write code in onload client script area and there are lots of other examples as well.

For more understanding with practical implementation, you can see this below onload client script video tutorial Link:
OnLoad Client Script Video Tutorial

 

onChange() Client Script:

So, the code written in onChange() client script will get executed when user change any value in an existing form.

  • Let’s take an example of incident form, when user change the requester name from the requester field then some existing field in the form become mandatory.
  • Let's take another example when user fill the assignment group then assigned to field become mandatory.
  • Let's take one more example, when user select the state as pending then one more field appears i.e. sub status.

So, from above example I want to say that if you want to make some field mandatory, read only, hidden or visible on the change of value in any field then you can write code over here.

For more understanding with practical implementation, you can see this below onChange() client script video tutorial Link:

OnChange Client Script Video Tutorial

 

onSubmit() Client Script:

So, the  code is written in onSubmit() client script will get executed when use submits the form. The code written in this area is basically use to validate the form. For e.g.

  • Let’ take an example of incident form, let’s say you are creating a new incident record but you have not filled the mandatory details and you click on submit button. 
  • Let’ take an another example, in start date and end data where you have to give the future dates, but you have given past dates on those field and click on submit button. 

So, from above examples I want to say that when you click on submit button the code validate the things and give you error message. So, onSubmit() change will help you to validate the form fields.

For more understanding with practical implementation, you can see this below onSubmit() client script video tutorial Link:

OnSubmit Client Script Video Tutorial

onCellEdit() Client Script:

So, the  code is written in onCellEdit() client script will get executed when user change any value in the list view. Now you are wondering what is the list view right. 
For that navigate to Incident Management and click on All link or open link or closed link. After click mentioned link you will find list view. So when user change any value or want to change any value directly from there, then the code written in onCellEdit() client script will get executed.

For more understanding with practical implementation, you can see this below onCellEdit() client script video tutorial Link:

OnCellEdit Client Script Video Tutorial

 

When things come to execution that which will execute first client script or UI Policy-

So, Client script will execute first. I post separate article for the same where with practical example we will understand the same. 

We hope above information and examples related to ServiceNow client script will be useful for you and helps you to understand and implement client script in ServiceNow. Please provide your feedback below and let us know if you need more information on client script or information on any other ServiceNow topic.

4 comments:

  1. On change it is not link type to video,it is in text.

    ReplyDelete
  2. On change is not a link to the video. It is just the text for rest it is link to video

    ReplyDelete
  3. thankyou for lucid illustration with relevant examples

    ReplyDelete

Thankyou !!!!

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