Use 'colspan' in view_attributes to remove a field

Support Developer
1

I’m struggling with the use of the view_attributes. I want to remove a field from a form when a certain condition is met. Otherwise the field should be visible.

In my XML I have:

<?xml version="1.0"?>
<form col="4">
  ......
  <label name="order"/> # Many2One
  <field name="order"/>
  <label name="location"/> # Selection field
  <field name="location"/>
  ......

Now I want to remove the field location from the form when order is empty. I tried:

@classmethod
def view_attributes(cls):
    return super(Order, cls).view_attributes() + [
    ('/form/field[@name="location"]', 'colspan',
            If(Bool(Eval('order', -1)), -1, 2),
    )]

Basically I want to say “If order is empty, set the colspan of the location to -1. Else do nothing”. I have tried several versions, but none of them are working. On the client side I get a message like:

ValueError: invalid literal for int() with base 10: '{"__class__": "If", "c": {"__class__": "Bool", "v": {"__class__": "Eval", "v": "order", "d": -1}}, "t": -1, "e": 2}'

I don’t want to make the field just invisible because I want to remove the empty space as well.

How can I achieve this?

2

You can not. colspan can not be dynamic, it is set only once when the view XML is parsed.
If you want to hide a field based on a statement, you should use the states['invisible'] of the field.

3

But states['invisible'] will only hide the field and does not give the space back right?
Would it be possible to display another field in that location? or will it be left empty?

4

The views are based on a grid system.

You can use a group to put multiple tag under the same cell.

But I think you should embrace the Tryton design and not try to simulate another.

5

For completeness there is this proposal Issue 7492: Support colspan -1 & 0 - Tryton issue tracker but this will not make them dynamic.

6

Thanks, I read that one and came up with the idea to use the colspan in the view_attributes.

For even more completeness, I had to hide two fields which makes it one row in the grid. I did put that row just above the tabs. Using it this way and hiding the fields, removes the empty space. So no need to use view_attributes, this can be defined on the field itself.

<?xml version="1.0"?>
<form col="4">
  ......
  <label name="order"/> # Many2One
  <field name="order"/>
  <newline/>
  <label name="location"/> # Selection field
  <field name="location"/>
  <label name="user"/> # Selection field
  <field name="user"/>
  <notebook colspan="4">
    <page string="General" id="general">
      ........  # page stuff
    </page>
    ........ # do more paged stuff
  </notebook>
  ......

So when setting the state to invisible for location and user the notebook will consume that empty space.

7

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