How to show frappe.confirm() before submitting the document?

4

Sorry, I forgot that frappe.confirm is a client-side method. Because these are async methods, you need to treat the prompt as a promise that you await:

frappe.ui.form.on('Test Doctype', {
    before_submit: async (frm) => {
        let prompt = new Promise((resolve, reject) => {
            frappe.confirm(
                'Are you sure?',
                () => resolve(),
                () => reject()
            );
        });
        await prompt.then(
            () => frappe.show_alert("Submitted", 3), 
            () => {
                frappe.validated = false;
                frappe.show_alert("Not submitted", 3)
            }
        );
    }
})
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