Cards as List Items Patterns

Interface patterns give you an opportunity to explore different interface designs. Be sure to check out How to Adapt a Pattern for Your Application.

Goal

Use the cards as list items pattern to create visually rich lists as an alternative to grids or feeds. This pattern uses a combination of cards and billboards to show lists of like items. You can easily modify the pattern to change the card content or the number of cards per row to fit your use case. This page explains how you can use this pattern in your interface, and walks through the design structure in detail.

cards_as_list_items_pattern_orig.png

Design structure

This page will break down this expression so you can better understand how to adapt this pattern to your own data.

The main components in this pattern are card layouts, side by side layouts, and billboard layouts. The image below displays how the pattern looks on a blank interface with callouts of the main components. You can examine the entire expression or jump down to the subsections below with referenced line numbers to see a detailed breakdown of the main components.

cards_as_list_pattern.png

Pattern expression

When you drag and drop the cards as list items pattern onto your interface, 153 lines of expressions will be added to the section where you dragged it.

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{
  a!localVariables(
    local!houses: {
      a!map(street: "2310 Groveland Ter",   city: "Reston", state: "VA", price: 879000,  beds: 3, baths: 2.5, sqft: 1934, img: "https://images.unsplash.com/photo-1492889971304-ac16ab4a4a5a?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=058c56771e5c8d1f9adf38dc794f6e0e&auto=format&fit=crop&w=3306&q=80"),
      a!map(street: "4147 Woodlane Dr",     city: "Reston", state: "VA", price: 719400,  beds: 2, baths: 1.5, sqft: 1415, img: "https://images.unsplash.com/photo-1480074568708-e7b720bb3f09?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=193a24d3505792ef2c9ace43b00fe4f5&auto=format&fit=crop&w=1400&q=60"),
      a!map(street: "1924 Victoria Dr",     city: "Reston", state: "VA", price: 925000,  beds: 3, baths: 2,   sqft: 2451, img: "https://images.unsplash.com/photo-1485996463739-9cb09adbe6c5?ixlib=rb-0.3.5&s=95f7a5e9e6c1c6637b6d686ee5946e53&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "5850 Paddock Way",     city: "Reston", state: "VA", price: 925000,  beds: 4, baths: 3.5, sqft: 3290, img: "https://images.unsplash.com/photo-1437751695201-298be97a82a8?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=1a6e6c222ee269587d9d336902f370e5&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "2900 Carver Rd, #301", city: "Reston", state: "VA", price: 529200,  beds: 1, baths: 1.5, sqft: 1160, img: "https://images.unsplash.com/photo-1460317442991-0ec209397118?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=b95599cb95166892018645cd2a22923a&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "7714 Andreas Ave",     city: "Reston", state: "VA", price: 742900,  beds: 2, baths: 2,   sqft: 1930, img: "https://images.unsplash.com/photo-1501183638710-841dd1904471?ixlib=rb-0.3.5&s=d9e9fe8649144a11972a8cbb10ad6cd3&auto=format&fit=crop&w=800&q=60")
    },
    local!numCols: 3, /* Change this to set a different number of columns. If you change this number, consider updating the stackWhen parameter on the columns layout */
    local!selectedCard,
    {
      a!columnsLayout(
        columns: a!forEach(
          items: enumerate(local!numCols) + 1,
          expression: a!localVariables(
            local!colIndex: fv!index,
            a!columnLayout(
              contents: {
                a!forEach(
                  items: local!houses,
                  expression: a!cardLayout(
                    contents: {
                      a!billboardLayout(
                        backgroundMedia: a!webImage(
                          source: fv!item.img
                        ),
                        height: "SHORT",
                        marginBelow: "NONE",
                        overlay: a!barOverlay(
                          contents: {
                            a!sideBySideLayout(
                              items: {
                                a!sideBySideItem(
                                  item: a!richTextDisplayField(
                                    label: "Street",
                                    labelPosition: "COLLAPSED",
                                    value: a!richTextItem(
                                      text: fv!item.street,
                                      size: "MEDIUM",
                                      style: "STRONG"
                                    )
                                  )
                                ),
                                a!sideBySideItem(
                                  item: a!richTextDisplayField(
                                    label: "City & State",
                                    labelPosition: "COLLAPSED",
                                    value: fv!item.city & ", " & fv!item.state
                                  ),
                                  width: "MINIMIZE"
                                )
                              },
                              alignVertical: "MIDDLE",
                              stackWhen: "TABLET_LANDSCAPE"
                            )
                          }
                        )
                      ),
                      a!cardLayout(
                        contents: {
                          a!sideBySideLayout(
                            items: {
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Price",
                                  labelPosition: "COLLAPSED",
                                  value: a!richTextItem(
                                    text: dollar(fv!item.price, 0),
                                    size: "LARGE",
                                    style: "STRONG"
                                  )
                                )
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Beds",
                                  value: fv!item.beds
                                ),
                                width: "MINIMIZE"
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Baths",
                                  value: fv!item.baths
                                ),
                                width: "MINIMIZE"
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Sq. Ft.",
                                  value: fixed(fv!item.sqft, 0, false)
                                ),
                                width: "MINIMIZE"
                              )
                            },
                            stackWhen: "TABLET_LANDSCAPE"
                          )
                        },
                        showBorder: false
                      )
                    },
                    link: a!dynamicLink(saveInto: a!save(local!selectedCard, fv!item.street)),
                    /* This logic assigns each card to the right column */
                    showWhen: or(mod(fv!index, local!numCols) = local!colIndex, and(mod(fv!index, local!numCols) = 0, local!colIndex = local!numCols)),
                    padding: "NONE",
                    marginBelow: "STANDARD"
                  )
                )
              }
            )
          )
        ),
        alignVertical: "TOP",
        showWhen: isNull(local!selectedCard),
        stackWhen: {
          "PHONE",
          "TABLET_PORTRAIT"
        }
      ),
      a!richTextDisplayField(
        value: "Details for " & local!selectedCard & " would appear here",
        showWhen: not(isNull(local!selectedCard)),
        align: "CENTER"
      ),
      a!richTextDisplayField(
        labelPosition: "COLLAPSED",
        value: {
          char(10),
          char(10),
          a!richTextIcon(
            icon: "arrow-left",
            link: a!dynamicLink(
              saveInto: a!save(local!selectedCard, null)
            ),
            linkStyle: "STANDALONE",
            color: "ACCENT"
          ),
          a!richTextItem(
            text: " Go back",
            link: a!dynamicLink(
              saveInto: a!save(local!selectedCard, null)
            ),
            linkStyle: "STANDALONE"
          )
        },
        showWhen: not(isNull(local!selectedCard)),
        align: "CENTER"
      )
    }
  )
}

[Line 1-12] Define columns and user selection

At the top of the pattern, local variables are set up to index the house data, define the number of columns, and determine the user selection (local!selectedCard, line 12).

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{
  a!localVariables(
    local!houses: {
      a!map(street: "2310 Groveland Ter",   city: "Reston", state: "VA", price: 879000,  beds: 3, baths: 2.5, sqft: 1934, img: "https://images.unsplash.com/photo-1492889971304-ac16ab4a4a5a?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=058c56771e5c8d1f9adf38dc794f6e0e&auto=format&fit=crop&w=3306&q=80"),
      a!map(street: "4147 Woodlane Dr",     city: "Reston", state: "VA", price: 719400,  beds: 2, baths: 1.5, sqft: 1415, img: "https://images.unsplash.com/photo-1480074568708-e7b720bb3f09?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=193a24d3505792ef2c9ace43b00fe4f5&auto=format&fit=crop&w=1400&q=60"),
      a!map(street: "1924 Victoria Dr",     city: "Reston", state: "VA", price: 925000,  beds: 3, baths: 2,   sqft: 2451, img: "https://images.unsplash.com/photo-1485996463739-9cb09adbe6c5?ixlib=rb-0.3.5&s=95f7a5e9e6c1c6637b6d686ee5946e53&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "5850 Paddock Way",     city: "Reston", state: "VA", price: 925000,  beds: 4, baths: 3.5, sqft: 3290, img: "https://images.unsplash.com/photo-1437751695201-298be97a82a8?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=1a6e6c222ee269587d9d336902f370e5&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "2900 Carver Rd, #301", city: "Reston", state: "VA", price: 529200,  beds: 1, baths: 1.5, sqft: 1160, img: "https://images.unsplash.com/photo-1460317442991-0ec209397118?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=b95599cb95166892018645cd2a22923a&auto=format&fit=crop&w=800&q=60"),
      a!map(street: "7714 Andreas Ave",     city: "Reston", state: "VA", price: 742900,  beds: 2, baths: 2,   sqft: 1930, img: "https://images.unsplash.com/photo-1501183638710-841dd1904471?ixlib=rb-0.3.5&s=d9e9fe8649144a11972a8cbb10ad6cd3&auto=format&fit=crop&w=800&q=60")
    },
    local!numCols: 3, /* Change this to set a different number of columns. If you change this number, consider updating the stackWhen parameter on the columns layout */
    local!selectedCard,

[Line 13-121] Configuring card layouts with nested components

We use a!forEach() to loop through each column that contains a card layout. Each card layout contains a billboard layout to display the overlay of the street and city/state on the card layout image, as well as a side by side layout to display the price, beds, baths, and Sq. Ft. The card layout link parameter uses a!dynamicLink() to save the user's selection.

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    {
      a!columnsLayout(
        columns: a!forEach(
          items: enumerate(local!numCols) + 1,
          expression: a!localVariables(
            local!colIndex: fv!index,
            a!columnLayout(
              contents: {
                a!forEach(
                  items: local!houses,
                  expression: a!cardLayout(
                    contents: {
                      a!billboardLayout(
                        backgroundMedia: a!webImage(
                          source: fv!item.img
                        ),
                        height: "SHORT",
                        marginBelow: "NONE",
                        overlay: a!barOverlay(
                          contents: {
                            a!sideBySideLayout(
                              items: {
                                a!sideBySideItem(
                                  item: a!richTextDisplayField(
                                    label: "Street",
                                    labelPosition: "COLLAPSED",
                                    value: a!richTextItem(
                                      text: fv!item.street,
                                      size: "MEDIUM",
                                      style: "STRONG"
                                    )
                                  )
                                ),
                                a!sideBySideItem(
                                  item: a!richTextDisplayField(
                                    label: "City & State",
                                    labelPosition: "COLLAPSED",
                                    value: fv!item.city & ", " & fv!item.state
                                  ),
                                  width: "MINIMIZE"
                                )
                              },
                              alignVertical: "MIDDLE",
                              stackWhen: "TABLET_LANDSCAPE"
                            )
                          }
                        )
                      ),
                      a!cardLayout(
                        contents: {
                          a!sideBySideLayout(
                            items: {
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Price",
                                  labelPosition: "COLLAPSED",
                                  value: a!richTextItem(
                                    text: dollar(fv!item.price, 0),
                                    size: "LARGE",
                                    style: "STRONG"
                                  )
                                )
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Beds",
                                  value: fv!item.beds
                                ),
                                width: "MINIMIZE"
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Baths",
                                  value: fv!item.baths
                                ),
                                width: "MINIMIZE"
                              ),
                              a!sideBySideItem(
                                item: a!richTextDisplayField(
                                  label: "Sq. Ft.",
                                  value: fixed(fv!item.sqft, 0, false)
                                ),
                                width: "MINIMIZE"
                              )
                            },
                            stackWhen: "TABLET_LANDSCAPE"
                          )
                        },
                        showBorder: false
                      )
                    },
                    link: a!dynamicLink(saveInto: a!save(local!selectedCard, fv!item.street)),
                    /* This logic assigns each card to the right column */
                    showWhen: or(mod(fv!index, local!numCols) = local!colIndex, and(mod(fv!index, local!numCols) = 0, local!colIndex = local!numCols)),
                    padding: "NONE",
                    marginBelow: "STANDARD"
                  )
                )
              }
            )
          )
        ),
        alignVertical: "TOP",
        showWhen: isNull(local!selectedCard),
        stackWhen: {
          "PHONE",
          "TABLET_PORTRAIT"
        }
      ),

[Line 122-153] Display selection content with rich text display fields

We then use rich text display fields to show the content for a selected house. When adapting this pattern to your use case, replace these display fields with your own content.

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      a!richTextDisplayField(
        value: "Details for " & local!selectedCard & " would appear here",
        showWhen: not(isNull(local!selectedCard)),
        align: "CENTER"
      ),
      a!richTextDisplayField(
        labelPosition: "COLLAPSED",
        value: {
          char(10),
          char(10),
          a!richTextIcon(
            icon: "arrow-left",
            link: a!dynamicLink(
              saveInto: a!save(local!selectedCard, null)
            ),
            linkStyle: "STANDALONE",
            color: "ACCENT"
          ),
          a!richTextItem(
            text: " Go back",
            link: a!dynamicLink(
              saveInto: a!save(local!selectedCard, null)
            ),
            linkStyle: "STANDALONE"
          )
        },
        showWhen: not(isNull(local!selectedCard)),
        align: "CENTER"
      )
    }
  )
}
Open in Github Built: Mon, Nov 15, 2021 (03:03:53 PM)

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