I need to execute a powershell script onChange or onSubmit of catalog client script

[SUHASM]

Dear developers, 

I have a powershell script which works fine in flow action. However, I need to execute that snippet in catalog client script as onChange or onSubmit script. By doing that, based on the response of that script, form will be allowed or denied submission. 

I am okay to execute that PS script as a flow action or Script Include or Business rule. 

Could someone please help me here?

Thanks, 

Suhas Marathe 

[Ankur Bawiskar]

@SUHASM 

you can trigger that flow action via script using GlideAjax

syntax here

Scripting with Flows, Subflows, and Actions 

You can also open that flow action, click 3 dots and click Create code snippet and use that script

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Ankur Bawiskar]

@SUHASM 

Hope you are doing good.

Did my reply answer your question?

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Chavan AP]

Please follow below steps:

Setup:
Create Script Include with name: PowerShellExecutor (Client callable: yes)
Replace 'YOUR_FLOW_SYS_ID' with your actual Flow sys_id
Replace 'your_field_name' with your catalog variable name
Create Catalog Client Script with Type: onChange

Script Include:

var PowerShellExecutor = Class.create();
PowerShellExecutor.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    /**
     * Execute PowerShell script and return result
     */
    executePowerShellScript: function() {
        var inputParam = this.getParameter('sysparm_input_param');
        var scriptType = this.getParameter('sysparm_script_type');
        
        try {
            // Option 1: Execute via REST Message
            var result = this._executeViaRestMessage(inputParam, scriptType);
            
            // Option 2: Execute via Flow (if preferred)
            // var result = this._executeViaFlow(inputParam, scriptType);
            
            return JSON.stringify({
                success: true,
                result: result,
                message: 'PowerShell script executed successfully'
            });
            
        } catch (error) {
            gs.error('PowerShell execution failed: ' + error.getMessage());
            return JSON.stringify({
                success: false,
                result: null,
                message: 'Script execution failed: ' + error.getMessage()
            });
        }
    },

    /**
     * Execute PowerShell via REST Message
     */
    _executeViaRestMessage: function(inputParam, scriptType) {
        var request = new sn_ws.RESTMessageV2();
        request.setEndpoint('YOUR_POWERSHELL_ENDPOINT_URL'); // Configure your endpoint
        request.setHttpMethod('POST');
        request.setRequestHeader('Content-Type', 'application/json');
        
        var requestBody = {
            script_type: scriptType,
            input_parameter: inputParam,
            execution_context: 'servicenow_catalog'
        };
        
        request.setRequestBody(JSON.stringify(requestBody));
        
        var response = request.execute();
        var responseBody = response.getBody();
        var httpStatus = response.getStatusCode();
        
        if (httpStatus == 200) {
            var parsedResponse = JSON.parse(responseBody);
            return parsedResponse.result;
        } else {
            throw new Error('HTTP ' + httpStatus + ': ' + responseBody);
        }
    },

    /**
     * Execute PowerShell via Flow Action
     */
    _executeViaFlow: function(inputParam, scriptType) {
        // Trigger Flow and wait for response
        var flowAPI = new sn_fd.FlowAPI();
        var flowInputs = {
            'input_parameter': inputParam,
            'script_type': scriptType
        };
        
        var flowResult = flowAPI.startFlow('YOUR_FLOW_SYS_ID', flowInputs);
        
        if (flowResult && flowResult.status == 'success') {
            return flowResult.output;
        } else {
            throw new Error('Flow execution failed');
        }
    },

    /**
     * Validate input parameters
     */
    validateInput: function() {
        var inputParam = this.getParameter('sysparm_input_param');
        
        if (!inputParam || inputParam.trim() == '') {
            return JSON.stringify({
                success: false,
                result: null,
                message: 'Input parameter is required'
            });
        }
        
        // Add your validation logic here
        return JSON.stringify({
            success: true,
            result: 'valid',
            message: 'Input validation passed'
        });
    },

    type: 'PowerShellExecutor'
});

 Catalog Client Script:

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue == '') return;
    
    // Replace 'your_field_name' with actual field name
    if (control.getFieldName() == 'your_field_name') {
        
        // Show loading message
        g_form.addInfoMessage('Validating... Please wait');
        
        // Call PowerShell script via GlideAjax
        var ga = new GlideAjax('PowerShellExecutor');
        ga.addParam('sysparm_name', 'executePowerShell');
        ga.addParam('sysparm_input_value', newValue);
        
        ga.getXMLAnswer(function(response) {
            var result = JSON.parse(response);
            
            if (result.success) {
                g_form.addInfoMessage('Validation passed: ' + result.result);
            } else {
                g_form.addErrorMessage('Validation failed: ' + result.message);
            }
        });
    }
}

[Chavan AP]

@SUHASM 

Glad I could help! If this solved your issue, please mark it as ✅ Helpful and ✅ Accept as Solution so others can benefit too.

Chavan A.P. Technical Architect | Certified Professional