How to Pass Payload to Pre-Post Pattern Script?

[RK25]

I am working on an extension section where I need to pull a file from the device and trying to pass it down to Pattern Pre/Post Script (When to execute = Post sensor). In this process, I pull the data and storing it in pattern table>column but not sure how to get the data in the column into Pattern Pre/Post Script to further processing the data. Appreciate any insight.

[Sayali Gurav]

To pass a payload to a Pre-Post Pattern script in ServiceNow, you'll need to use GlideAjax or GlideHTTPRequest to send data to the server.

Here's a basic outline of how you can do it:

1. Define a Pre-Post Pattern Script:

   - In ServiceNow, go to System Definition > Script Includes.

   - Create a new script include or edit an existing one.

   - Define the function where you want to receive the payload.

2. Use GlideAjax to Send Data:

   - In your client-side script (like in a UI Action or Client Script), use GlideAjax to send data to the server.

   - Construct a JSON object or other suitable format to pass as your payload.

   Example using GlideAjax:

   ```javascript

   var ga = new GlideAjax('MyScriptInclude'); // 'MyScriptInclude' is the name of your script include

   ga.addParam('sysparm_name', 'myFunction'); // Name of the function in your script include

   ga.addParam('sysparm_myData', JSON.stringify(myData)); // 'myData' is your payload

   ga.getXMLAnswer(myCallback);

   ```

3. Receive and Process the Payload in the Script Include:

   - In your Pre-Post Pattern Script, access the data using `request.getParameter('sysparm_myData')`.

   Example in your Script Include:

   ```javascript

   var myFunction = function() {

     var myData = request.getParameter('sysparm_myData');

     // Process 'myData' as needed

   };

   ```

Remember to replace `'MyScriptInclude'`, `'myFunction'`, and `'sysparm_myData'` with your actual script include name, function name, and parameter name.

Ensure that you handle any potential errors or exceptions properly in your scripts.

Please note that specific details might vary based on your ServiceNow instance version and configurations. Always refer to the official ServiceNow documentation and consult your instance's administrators for any customized configurations.

Thanks & Regards, 

Sayali Gurav

[RK25]

Thanks for the response Gaurav. Your solution sounding more like how to work with client scripts and script include. I am looking for something where I can pass the payload back into pre-post pattern script from patterns. Your solution may not applicable for my scenario.

[Sayali Gurav]

To pass the payload back into a pre-post pattern script from patterns in ServiceNow, you'll typically use the GlideAjax API. This allows you to make server-side calls from the client-side script.

Here's a general outline of the steps:

1. Create a Script Include:
- Go to System Definition > Script Includes.
- Create a new script include with your desired name.
- Write the server-side JavaScript code that will process the payload.

2. Define the AJAX Function:
- In your client-side script, use GlideAjax to make a server-side call.
- Here's an example of how you can do this in Javascript:

javascript
var ga = new GlideAjax('YourScriptIncludeName');
ga.addParam('sysparm_name', 'methodName'); // Method in your Script Include
ga.addParam('sysparm_payload', yourPayloadVariable); // Add your payload here
ga.getXML(callbackFunction); // Define a callback function

3. Process the Payload in Script Include:
- In your Script Include, retrieve the payload using gs.getRequest().getParameter('sysparm_payload').
- Process the payload and return any necessary information.

javascript
var payload = gs.getRequest().getParameter('sysparm_payload');
// Process the payload as needed

// Return any result back to the client-side script
return result;

4. Handle the Result in the Callback Function:
- In the callback function, you can handle the result returned by the server-side script include.

javascript
function callbackFunction(response) {
var answer = response.responseXML.documentElement.getAttribute("answer");
// Process the answer as needed
}

Remember to replace 'YourScriptIncludeName' with the actual name of your Script Include, and 'methodName' with the name of the method you defined in the Script Include.

This is a high-level overview. Specific implementation details might vary based on your ServiceNow version and specific use case. Make sure to refer to ServiceNow's documentation for the most accurate and up-to-date information.

Thanks & Regards

Sayali Gurav

[RK25]

Sorry. Not sure If I am following you correctly. My goal is to pass the payload to a pre post processing script from a pattern extension section where I pull this data from a server and store it in a pattern variable.