How can I raise a warning message in Odoo website

问题

In Odoo 8, I am using a custom module which checks that VAT is unique, using @api.constrains('vat', 'parent_id', 'company_id'), and raising a warning when vat already exists.

But in the website purchase checkout form, I am making the customers enter the VAT. It happens that when a repeated VAT is entered I get a 500 internal server error, since the website does not provide a way to raise the warning.

How should I implement a warning, a pop-up or similar in order to avoid those internal server errors?

回答1:

You can use a JSON-RPC call to backend when submit button is clicked, before sending form data.

1. Create a new controller in python for validating a VAT:

   @http.route(['/vat/validator'], type='json', auth="public", website=True)
   def vat_validator(self, vat):
       # Your validation code here
       return 'OK'
   

2. Create a JS method for calling validator:

   (function() {
        'use strict';
   
       function vat_validator(vat) {
           openerp.jsonRpc('/vat/validator', 'call', {'vat': vat}).then(function(result) {
               // Your JS code here for checking backend validator result
           })        
       }
   })();
   

3. Set a form validation JS method like this: http://www.w3schools.com/js/js_validation.asp

来源：https://stackoverflow.com/questions/34069000/how-can-i-raise-a-warning-message-in-odoo-website