Form layout customization

This is the official documentation of the forestadmin-agent-django and forestadmin-agent-flask Python agents.

Form layout

The form layout feature lets you organize your fields in pages or rows, and add separators or html blocks. This is especially useful if you have many fields to display, and you want to break down your action form into more manageable chunks !

Theses form elements are available since the version 1.16.0 of the agent.

Layout items

Name	Nested elements	Description
Separator	None	Allow to add a horizontal separator between two form elements
HTML block	None	Allow to show HTML content
Row	Fields	Allow to put two (and only two) fields (and not layout elements) in a row
Page	Fields & layouts elements (but no pages)	Allow to use multi pages forms. ⚠️ When using multi pages form, you must have only pages at the root of your form.

General properties

Some layouts items will have options, but here are the common properties to all the layout elements

Name	Usage	Expected value	Description
type	required	Layout	It differentiate a field from layout elements. See over values in static form documentation
component	required	Separator, Row, HtmlBlock, or Page	The layout component
if_	optional	callable with context parameter	Only display the field if the function returns true. This one is the exact same one as presented in dynamic forms

Separator element

Name	Usage	Expected value	Description
component	required	"Separator"	To enable this component

This item doesn't have specific options.

Example:

agent.customize_collection("customer").add_action("What's your name",{
    "scope": "Single",
    "execute": lambda context, result_builder: result_builder.success(),
    "form": [
        {"type": "String", "label": "firstName"},
        {"type": "Layout", "component": "Separator"},
        {"type": "String", "label": "lastName"},
    ]}
)

Example

HTML Block element

Name	Usage	Expected value	Description
component	required	"HtmlBlock"	To enable this component
content	required	String or callable with context parameter, returning a string formatted as html	This is the HTML content to show

Example:

agent.customize_collection("customer").add_action("Boring form", {
    "scope": "Global",
    "execute": lambda context, result_builder: result_builder.success(),
    "form": [
        {
            "type": "String",
            "label": "firstName",
            "default_value": lambda ctx: ctx.caller.first_name,
        },
        {
            "type": "String",
            "label": "lastName",
            "default_value": lambda ctx: ctx.caller.last_name,
        },
        {
            "type": "Layout",
            "component": "HtmlBlock",
            "content": lambda ctx: f"""
<div style="text-align:center;">
    <p>
        <strong>Hi {ctx.form_values["firstName"]} {ctx.form_values["lastName"]}</strong>,
        <br/>here you can put
        <strong style="color: red;">all the html</strong> you want.
    </p>
</div>
<div style="display: flex; flex-flow: row wrap; justify-content: space-around;">
    <a href="https://www.w3schools.com" target="_blank">
        <img src="https://www.w3schools.com/html/w3schools.jpg">
    </a>
    <iframe src="https://www.youtube.com/embed/xHPKuu9-yyw?autoplay=1&mute=1"></iframe>
</div>
""",
        },
    ]}
)

Example

Row element

⚠️ This element is designed to work with only two inner fields. You can control the display of each field using the if_ property. If only one field is displayed, it will occupy the entire line. However, if the conditions defined by the if_ properties result in more than two fields being displayed, only the first two will be shown. If there is nothing inside, it will be removed.

Name	Usage	Expected value	Description
component	required	"Row"	To enable this component
fields	required	Array of two fields	These two fields are the ones you want to display in a line ⚠️ No layout elements are allowed in a Row component; only fields

Example:

agent.customize_collection("customer").add_action("Personal form", {
    "scope": "Global",
    "execute": lambda context, result_builder: result_builder.success(),
    "form": [
        # ...
        {
            "type": "Layout",
            "component": "Row",
            "fields": [
                {
                    "label": "gender",
                    "type": "Enum",
                    "enum_values": ["M", "F", "other"],
                },
                {
                    "label": "specify",
                    "description": "you may specify here"
                    "type": "String",
                    "if_": lambda ctx: ctx.form_values.get("gender") == "other",
                },
            ]
        },
        # ...
    ]}
)

Example

Multi pages form

Description

The pages feature is a way to break up your action form into more manageable chunks, by showing only a subset of fields at the same time, and letting the user navigate between the pages.

Limitations

Please note this list of limitations:

• You cannot mix fields and pages at the root of your form, or put nest a page in a page

• The next (or previous) button is not clickable on the last (or first) page

• If you're using if conditions in a page; keep in mind that if all the elements in your page are hidden, the page will automatically be removed. You can avoid this by behavior by adding an unconditional htmlBlock inside your page explaining why is your page empty.

Name	Usage	Expected value	Description
component	required	"Page"	To enable this component
elements	required	Array of fields and layout elements	The layout elements defined in this page and the fields defined in the others documentation
next_button_label	optional	String	The label on the next button
previous_button_label	optional	String	The label on the previous button

Example:

agent.customize_collection("customer").add_action("Create user with address", {
    "scope": "Global",
    "execute": lambda context, result_builder: result_builder.success(),
    "form": [
        {
            "type": "Layout",
            "component": "Page",
            "next_button_label": "Go to address",
            "elements": [
                {"type": "String", "id": "Firstname", "label": "First name"},
                {"type": "String", "id": "Lastname", "label": "Last name"},
                {"type": "Layout", "component": "Separator"},
                {"type": "Date", "id": "Birthdate", "label": "Birth date"},
            ],
        },
        {
            "type": "Layout",
            "component": "Page",
            "previous_button_label": "Go back to identity",
            "elements": [
                {
                    "type": "Layout",
                    "component": "Row",
                    "fields": [
                        {"type": "Number", "id": "StreetNumber", "label": "Street number"},
                        {"type": "String", "id": "StreetName", "label": "Street name"},
                    ],
                },
                {"type": "Layout", "component": "Separator"},
                {"type": "String", "id": "PostalCode", "label": "Postal code"},
                {"type": "String", "id": "City"},
                {"type": "Layout", "component": "Separator"},
                {"type": "String", "label": "Country"},
            ],
        },
    ]}
)

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