1. Create a Wizard Model (Python)

# models/won_wizard.py
from odoo import models, fields

class CRMWonWizard(models.TransientModel):
    _name = 'crm.won.wizard'
    _description = 'Wizard triggered when deal is Closed Won'

    message = fields.Text(string="Message", default="You have marked this opportunity as Closed Won.")

    def action_confirm(self):
        return {'type': 'ir.actions.act_window_close'}

2. Define Wizard View (XML)

<!-- views/won_wizard_view.xml -->
<odoo>
    <record id="view_crm_won_wizard_form" model="ir.ui.view">
        <field name="name">crm.won.wizard.form</field>
        <field name="model">crm.won.wizard</field>
        <field name="arch" type="xml">
            <form string="Closed Won Confirmation">
                <group>
                    <field name="message" readonly="1"/>
                </group>
                <footer>
                    <button name="action_confirm" type="object" class="btn-primary" string="OK"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="action_crm_won_wizard" model="ir.actions.act_window">
        <field name="name">Closed Won Wizard</field>
        <field name="res_model">crm.won.wizard</field>
        <field name="view_mode">form</field>
        <field name="view_id" ref="view_crm_won_wizard_form"/>
        <field name="target">new</field>
    </record>
</odoo>

3. Extend JS to Trigger Wizard

// static/src/js/crm_stage_wizard.js
odoo.define('your_module_name.crm_stage_wizard', function (require) {
    "use strict";

    const FormController = require('web.FormController');
    const core = require('web.core');
    const rpc = require('web.rpc');

    const Dialog = require('web.view_dialogs');

    FormController.include({
        _saveRecord: function () {
            const self = this;
            return this._super.apply(this, arguments).then(function (result) {
                if (self.modelName === 'crm.lead' && self.renderer.state.data.stage_id.display_name === 'Closed Won - 100%') {
                    rpc.query({
                        model: 'ir.actions.act_window',
                        method: 'search_read',
                        domain: [['res_model', '=', 'crm.won.wizard']],
                        fields: ['id'],
                        limit: 1,
                    }).then(function (actions) {
                        if (actions.length) {
                            self.do_action(actions[0].id);
                        }
                    });
                }
                return result;
            });
        },
    });
});

4. Load JS in Assets (XML)

<!-- views/assets.xml -->
<odoo>
    <template id="assets_backend" name="CRM Wizard Assets" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <script type="text/javascript" src="/your_module_name/static/src/js/crm_stage_wizard.js"/>
        </xpath>
    </template>
</odoo>

5. Don't forget to:

• Add the wizard view and assets to your module’s __manifest__.py
• Upgrade your module
• Clear browser cache (for JS changes)

Why This JS Method Works :

• _saveRecord is triggered after the user changes the stage and hits Save.
• The JS checks if the stage_id name is "Closed Won - 100%".
• If true, it finds the action linked to the wizard model and opens it using do_action().

Thanks & Regards,

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