Create a button and validate the fields on button click

To create a button and on button click validate the fields

User Event Script

function beforeLoad(context) {
        if (context.type === context.UserEventType.VIEW) {
            let form = context.form;
            let customerRecord = context.newRecord;
            let isProjectCreated = customerRecord.getValue({ fieldId: 'custentity_jj_jira_project_crtd_ns' });
            let jiraProjectName = customerRecord.getValue({ fieldId: 'custentity_jj_jira_project_name' });
            let jiraProjectId = customerRecord.getValue({ fieldId: 'custentity_jj_jira_project_id' });
            if (!isProjectCreated) {
                form.addButton({
                    id: 'custpage_create_jira_project',
                    label: 'Create Jira Project',
                    functionName: `handleJiraProjectCreation("${jiraProjectName}","${jiraProjectId}")`
                });
                form.clientScriptModulePath = './jj_cs_project_create_button 22.js'; // Attach Client Script
            }
        }
    }

Client Script

function handleJiraProjectCreation(jiraProjectName, jiraProjectId) {
        let rec = currentRecord.get();
        let customerId = rec.id;
        if (!customerId) {
            dialog.alert({ title: 'Error', message: 'Unable to fetch Customer ID.' });
            return;
        }
        if (!jiraProjectName || !jiraProjectId) {
            dialog.alert({ title: 'Missing Values', message: 'Jira Project Name and Jira Project ID are required.' });
            return;
        }
        dialog.confirm({
            title: 'Confirm Action',
            message: 'Are you sure you want to create a Jira project?'
        }).then((result) => {
            if (result) {
                callSuitelet(customerId);
            }
        });
    }