Customize a field¶

Subclass an existing field component¶

Let's take an example where we want to extends the BooleanField to create a boolean field displaying "Late!" in red whenever the checkbox is checked.

Create a new widget component extending the desired field component.

late_order_boolean_field.js¶

import { registry } from "@web/core/registry";
import { BooleanField } from "@web/views/fields/boolean/boolean_field";
import { Component, xml } from "@odoo/owl";

class LateOrderBooleanField extends BooleanField {
   static template = "my_module.LateOrderBooleanField";
}

Create the field template.

The component uses a new template with the name my_module.LateOrderBooleanField. Create it by inheriting the current template of the BooleanField.

late_order_boolean_field.xml¶

<?xml version="1.0" encoding="UTF-8" ?>
<templates xml:space="preserve">
    <t t-name="my_module.LateOrderBooleanField" t-inherit="web.BooleanField">
        <xpath expr="//CheckBox" position="after">
              <span t-if="props.value" class="text-danger"> Late! </span>
        </xpath>
    </t>
</templates>

Register the component to the fields registry.
late_order_boolean_field.js¶
```
registry.category("fields").add("late_boolean", LateOrderBooleanField);
```
Add the widget in the view arch as an attribute of the field.
```
<field name="somefield" widget="late_boolean"/>
```

Create a new field component¶

Assume that we want to create a field that displays a simple text in red.

Create a new Owl component representing our new field

my_text_field.js¶

import { standardFieldProps } from "@web/views/fields/standard_field_props";
import { Component, xml } from "@odoo/owl";
import { registry } from "@web/core/registry";

export class MyTextField extends Component {
   static template = xml`
      <input t-att-id="props.id" class="text-danger" t-att-value="props.value" onChange.bind="onChange" />
   `;
   static props = { ...standardFieldProps };
   static supportedTypes = ["char"];

   /**
   * @param {boolean} newValue
   */
   onChange(newValue) {
      this.props.update(newValue);
   }
}

The imported standardFieldProps contains the standard props passed by the View such as the update function to update the value, the type of the field in the model, the readonly boolean, and others.

In the same file, register the component to the fields registry.
my_text_field.js¶
```
registry.category("fields").add("my_text_field", MyTextField);
```
This maps the widget name in the arch to its actual component.
Add the widget in the view arch as an attribute of the field.
```
<field name="somefield" widget="my_text_field"/>
```

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