Backend layout 

Backend layout video 

Benjamin Kott: How to implement frontend layouts in TYPO3 using backend layouts

Backend layout configuration 

The backend layout to be used can be configurated for each page and/or a pages' subpages in the Page properties > Appearance. Multiple backend layouts are available if an extension providing backend layouts is installed or backend layouts have been defined as records or page TSconfig.

The Info module gives an overview of the backend layouts configured or inherited from a parent page at Web > Info > Pagetree overview > Type: Layouts:

Backend layout definition 

Backend layouts can be configured either as "backend layout" record in a sysfolder or as page TSconfig entry in mod.web_layout.BackendLayouts. Each layout will be saved with a key. The "backend layout" records are using their uid as a key, therefore layouts defined via page TSconfig should use a non-numeric string key. It is a good practice to use a descriptive name as key.

The entries title and icon are being used to display the backend layout options in the page properties.

The overall grid size will be defined by config.backend_layout.colCount and rowCount. Additional rows in the rows array and additional columns in the each rows columns section will be ignored when they are greater than rowCount or colCount respectively.

Each column position can span several columns and or several rows. Each column position must have a distinct number between 0 and n. It is best practice to always assign "0" to the main column if there is such a thing as a main column. Multiple backend layouts that contain similar parts, i.e. header, footer, aside, ... should each have assigned the same number within one project. This leads to a uniform position of the content, which makes it more clear for further use.

For usage with the page-content data processor, an identifier string must be assigned to each column. The default backend layout definition uses identifier = main for column 0.

Backend layout simple example 

The following page TSconfig example creates a simple backend layout consisting of two rows and just one column.

mod {
  web_layout {
    BackendLayouts {
      exampleKey {
        title = Example
        config {
          backend_layout {
            colCount = 1
            rowCount = 2
            rows {
              1 {
                columns {
                  1 {
                    identifier = border
                    name = LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:colPos.I.3
                    colPos = 3
                    colspan = 1
                  }
                }
              }
              2 {
                columns {
                  1 {
                    identifier = main
                    name = Main
                    colPos = 0
                    colspan = 1
                  }
                }
              }
            }
          }
        }
        icon = EXT:example_extension/Resources/Public/Images/BackendLayouts/default.gif
      }
    }
  }
}

Backend layout advanced example 

The following page TSconfig example creates a 3x3 backend layout with 5 column position sections in total. The topmost row (here called "header") spans all 3 columns. There is an "aside" spanning two rows on the right.

mod.web_layout.BackendLayouts {
  exampleKey {
    title = Example
    icon = EXT:example_extension/Resources/Public/Images/BackendLayouts/default.gif
    config {
      backend_layout {
        colCount = 3
        rowCount = 3
        rows {
          1 {
            columns {
              1 {
                identifier = header
                name = Header
                colspan = 3
                colPos = 1
              }
            }
          }
          2 {
            columns {
              1 {
                identifier = main
                name = Main
                colspan = 2
                colPos = 0
              }
              2 {
                identifier = aside
                name = Aside
                rowspan = 2
                colPos = 2
              }
            }
          }
          3 {
            columns {
              1 {
                identifier = left
                name = Main Left
                colPos = 5
              }
              2 {
                identifier = right
                name = Main Right
                colPos = 6
              }
            }
          }
        }
      }
    }
  }
}

Output of a backend layout in the frontend 

The backend layout to be used on a certain page gets determined either by the backend layout being chosen directly and stored in the pages field "backend_layout" or by the field "backend_layout_next_level" of a parent page up the rootline.

To avoid complex TypoScript for integrators, the handling of backend layouts has been simplified for the frontend.

To get the correct backend layout, the following TypoScript code can be used:

page.10 = FLUIDTEMPLATE
page.10 {
  file.stdWrap.cObject = CASE
  file.stdWrap.cObject {
	key.data = pagelayout

	default = TEXT
	default.value = EXT:sitepackage/Resources/Private/Templates/Home.html

	3 = TEXT
	3.value = EXT:sitepackage/Resources/Private/Templates/1-col.html

	4 = TEXT
	4.value = EXT:sitepackage/Resources/Private/Templates/2-col.html
  }
}

Using data = pagelayout is the same as using as

field = backend_layout
ifEmpty.data = levelfield:-2,backend_layout_next_level,slide
ifEmpty.ifEmpty = default

In the Fluid template the column positions can be accessed now via content mapping as described here Display the content elements on your page.

Reference implementations of backend layouts 

The extension bk2k/bootstrap-package ships several Backend layouts as well as an example configuration of how to include frontend templates for backend layouts (see its setup.typoscript)

Extensions for backend layouts 

In many cases besides defining fixed backend layouts a more modular approach with the possibility of combining different backend layouts and frontend layouts may be feasible. The extension b13/container integrates the grid layout concept also to regular content elements.

The extension ichhabrecht/content-defender offers advanced options to the column positions i.e. allowed or disallowed content elements, a maximal number of content elements.