Offline Mobile Design Best Practices

Introduction

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When you enable an interface for offline use, you are changing the way the interface communicates with the server when accessed on Appian Mobile.

On desktop and mobile browsers, offline interfaces evaluate the same as any other interface. However, when accessed on Appian Mobile, offline interfaces do not communicate with the server, except during an offline data sync. This is true whether the user is online or offline.

Basically, offline interfaces are different from standard interfaces in the following ways:

• In Appian Mobile, offline interfaces only communicate with the server during an offline data sync.
• During this sync, anything stored in local variables at the top of the interface is cached to the user's device so that they can access it while offline.

Because of this, you need to design offline interfaces with certain principles and best practices in mind. This page outlines what to consider when designing offline interfaces.

Working with data

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Since offline interfaces only connect to the server during an offline data sync, you'll need to consider how you query data in an offline interface. The following sections outline some query best practices to use in your offline interfaces.

Query all data in a local variable at the top of the interface

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Guideline

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Query all data in local variables or rule inputs at the top of the interface so that they evaluate on the first load of the interface.

Importance

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During an offline data sync, all offline interfaces run through their initial evaluation. Only local variables defined at the top of the interface, before any components, are included in this initial evaluation. The data queried within these local variables is the only data available in an offline interface.

Attempting to query data elsewhere in the interface will result in an error on Appian Mobile, as offline interfaces cannot communicate with the server outside of an offline data sync.

Example: Querying data in a local variable at the top of an interface

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In this example, we query data in a local variable at the top of the interface so that we can use this data throughout the interface.

The rule!getAllCustomers() rule could be any number of methods used to get data such as a!queryRecordType() or an integration.

a!localVariables(
/* Query all data in a local variable at the top of the interface */
!  local!customers: rule!getAllCustomers(),
  local!selectedCustomer,
  ...
  {
    ...
    a!dropdownField(
      label: "Customers",
/* The offline interface knows what to use for choiceLabels and choiceValues because it was queried on the initial load of the interface during an offline data sync and downloaded to the user's device */
!      choiceLabels: local!customers[recordType!Customer.fields.name],
!      choiceValues: local!customers[recordType!Customer.fields.id],
      value: local!selectedCustomer,
      saveInto: local!selectedCustomer
    ),
    ...
  }
)Copy

{
  ...
/* The offline interface won't know what to use for choiceLabels and choiceValues because it didn't get the data when the interface was initially loaded during an offline data sync */
  a!dropdownField(
    label: "Customers",
!    choiceLabels: rule!getAllCustomers()[recordType!Customer.fields.name],
!    choiceValues: rule!getAllCustomers()[recordType!Customer.fields.id],
    value: local!selectedCustomer,
    saveInto: local!selectedCustomer
  ),
 
  ...
}Copy

Query data for child interfaces or rules at the top of the parent interface

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Guideline

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When using child interfaces or rules, query the data in a local variable at the top of the parent interface and pass it to the child using a rule input.

Importance

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During an offline data sync, only the data in the parent interface is downloaded to the user's device. If you try to query the data in the child interface or rule, it will cause an error on Appian Mobile.

Example

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In the following example, the data is queried in a local variable at the top of the parent interface. The variable is then used for the data parameter value for the child interface.

In the child interface, we use a rule input for the data parameter. This ensures that no querying happens in the child interface.

a!localVariables(
/* Query data in a local variable at the top of the parent interface */
!  local!dataForGrid: rule!getData(),
  {
    /*... other components ...*/
/* Pass in external data to child rules using rule inputs. */
    rule!childGridInterface(
!      gridData: local!dataForGrid
    )
    /*... other components ...*/
  }
)Copy

{
  a!gridField(
    label: "Read-Only Grid",
/* Use a rule input for the data */
!    data: ri!gridData,
    columns: {}
  )
}Copy

{
  /*... other components ...*/
  rule!childGridInterface(),
  /*... other components ...*/
}Copy

a!localVariables(
  local!dataForGrid: rule!getData(),
  {
    a!gridField(
      label: "Read-Only Grid",
/* Querying for the data in the child rule will result in an error */
      data: local!dataForGrid,
      columns: {}
    )
  }
)Copy

Only query the data you need

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Guideline

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Limit your queries to retrieve only the necessary data for your interface. You can do this by:

• Using filters to return specific data.
• Including only the required fields in your query.
• Using paging to limit the number of results.

Importance

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Offline interfaces must download data to a user's device, and the speed of this download depends on the device hardware and the amount of data being downloaded. Downloading too much data can slow down performance, particularly on less powerful mobile devices.

Example: Only query the data you need

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The following example only returns the id, name, email, and billing address for a customer, rather than returning all fields. It also uses paging and filtering to further filter the information.

a!localVariables(
  local!recentInpections: a!queryRecordType(
    recordType: recordType!Inspection,
/* This limits the query to the 4 fields we need */
    fields: {
      recordType!Inspection.fields.facilityName,
      recordType!Inspection.fields.rating,
      recordType!Inspection.fields.enforcementAction,
      recordType!Inspection.fields.inspectionDate
    },
/* This limits the query to only inspections from the last year */
    filters: a!queryFilter(
      field: recordType!Inspection.fields.inspectionDate,
      operator: ">",
      value: todatetime(today() - 365)
    ),
/* This limits the number of records returned to 5 */
    pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 5)
  ).data,
  {
    a!gridField(
      label: "Recent Inspections",
      data: local!recentInpections,
      columns: {
        a!gridColumn(
          label: "Facility Name",
          value: fv!row[recordType!Inspection.fields.facilityName]
        ),
        a!gridColumn(
          label: "Rating",
          value: fv!row[recordType!Inspection.fields.rating]
        ),
        a!gridColumn(
          label: "Enforcement Action",
          value: fv!row[recordType!Inspection.fields.enforcementAction]
        ),
        a!gridColumn(
          label: "Date",
          value: fv!row[recordType!Inspection.fields.inspectionDate]
        )
      }
    )
  }
)Copy

a!localVariables(
  local!recentInpections: a!queryRecordType(
/* This query will return all fields and the maximum amount of records */
    recordType: recordType!Inspection,
    pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 5000)
  ).data,
  {
    a!gridField(
      label: "Recent Inspections",
      data: local!recentInpections,
      columns: {
        a!gridColumn(
          label: "Facility Name",
          value: fv!row[recordType!Inspection.fields.facilityName]
        ),
        a!gridColumn(
          label: "Rating",
          value: fv!row[recordType!Inspection.fields.rating]
        ),
        a!gridColumn(
          label: "Enforcement Action",
          value: fv!row[recordType!Inspection.fields.enforcementAction]
        ),
        a!gridColumn(
          label: "Date",
          value: fv!row[recordType!Inspection.fields.inspectionDate]
        )
      }
    )
  }
)Copy

Working with charts and read-only grids

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For the data parameter, use a local variable that calls a!queryRecordType()

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Guideline

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When displaying a chart or read-only grid in an offline interface, don't reference a record type directly in the data parameter. Instead, query the record type in a local variable and reference the local variable in the grid.

Importance

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During an offline data sync, only data queried in local variables at the top of the interface is downloaded to the user's device. If a chart or grid references a record type directly in its data parameter, the query is moved to the component, preventing the data from being downloaded for offline use and causing the interface to error on Appian Mobile.

Example

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In the following example, we query the Inspection record type in a local variable, instead of referencing the record type in the data parameter of the grid.

a!localVariables(
/* This local variable queries the data for the grid */
  local!recentInpections: a!queryRecordType(
    recordType: recordType!Inspection,
    pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 5)
  ).data,
  {
    a!gridField(
      label: "Recent Inspections",
/* The data parameter references the local variable that queries the data for the grid */
      data: local!recentInpections,
      columns: {
        a!gridColumn(
          label: "Facility Name",
          value: fv!row[recordType!Inspection.fields.facilityName]
        ),
        a!gridColumn(
          label: "Rating",
          value: fv!row[recordType!Inspection.fields.rating]
        ),
        a!gridColumn(
          label: "Enforcement Action",
          value: fv!row[recordType!Inspection.fields.enforcementAction]
        ),
        a!gridColumn(
          label: "Date",
          value: fv!row[recordType!Inspection.fields.inspectionDate]
        )
      }
    )
  }
)Copy

a!gridField(
  label: "Recent Inspections",
/* Referencing a record type in the data parameter will cause the interface to error in Appian Mobile */
  data: recordType!Inspection,
  columns: {
    a!gridColumn(
      label: "Facility Name",
      value: fv!row[recordType!Inspection.fields.facilityName]
    ),
    a!gridColumn(
      label: "Rating",
      value: fv!row[recordType!Inspection.fields.rating]
    ),
    a!gridColumn(
      label: "Enforcement Action",
      value: fv!row[recordType!Inspection.fields.enforcementAction]
    ),
    a!gridColumn(
      label: "Date",
      value: fv!row[recordType!Inspection.fields.inspectionDate]
    )
  }
)Copy

Only use parameters that work in an offline interface

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Guideline

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For read-only grids and charts in offline interfaces, do not use the parameters listed in the following table:

Importance

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Grid header, record action, and load data async parameters don't work in offline grids and charts because they require you to reference a record type in the data parameter.

Refresh parameters don't work in offline read-only grids or charts because they trigger a server call. Since offline interfaces can only communicate with the server during an offline data sync, this would cause the interface to error on Appian Mobile.

Working with partially compatible functions

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Get the value for the function in a local variable at the top of the interface

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Guideline

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To use functions that are partially compatible with offline mobile, load them in a local variable at the top of the interface.

Importance

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Functions that are partially compatible with offline mobile require a server connection in order to evaluate. By loading these functions and components at the top of the page, they can run during the initial evaluation during an offline data sync. But they cannot run during a reevaluation while the user is offline.

If partially compatible functions are used outside of these variables, they will try to evaluate when the interface can't communicate with the server and will cause an error in Appian Mobile.

Example

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For example, even though loggedInUser() isn't supported for offline reevaluations, you can still use this function by saving the resulting value into a local variable at the top of the interface.

When the user performs an offline data sync, the interface will automatically load all offline interfaces in the background and get the value for loggedInUser(). When the user goes offline, it will use the value that was updated when they last refreshed.

If you tried to use loggedInUser() in the saveInto parameter, it would return an error on Appian Mobile since it cannot connect to the server to get the value.

a!localVariables(
/* In order to get the logged in user, we save it into a local variable at the top of the interface */
!  local!user: loggedInUser(),
  a!formLayout(
    buttons: a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: "Submit",
          style: "SOLID",
/* Then we save the local variable into the rule input */
!          saveInto: a!save(ri!user, local!user)
        )
      }
    )
  )
)Copy

a!formLayout(
  buttons: a!buttonLayout(
    primaryButtons: {
      a!buttonWidget(
        label: "Submit",
        style: "SOLID",
/* If we try to ask for the logged in user here, we can't connect to the server to get the value */
!        saveInto: a!save(ri!user, loggedInUser())
      )
    }
  )
)Copy

Set the refreshOnReferencedVarChange parameter to false

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Guideline

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When you use a local variable to store the value of partially compatible functions in offline interfaces, use a!refreshVariable() to set the value of refreshOnReferencedVarChange to false.

Importance

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By default, all local variables automatically refresh whenever a variable they reference is updated. If that refresh happens while the interface can't communicate with the server, it would cause the interface to error on Appian Mobile.

Example

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For example, imagine you have a list of users that you want to query. However, the username is in the format "firstname.lastname" and you would like to display it as "Firstname Lastname."

If you are designing the interface for offline use, you would want to store the list of users in a local variable at the top of the interface.

You can then store the prettified version of the names into another local variable. If you use a!refreshVariable() and set the value of refreshOnReferencedVarChange to false, you can ensure this variable is only evaluated when the interface is first loaded. If refreshOnReferencedVarChange is not set to false and local!users is updated in a saveInto somewhere else in the interface, local!usersForDisplay would automatically update and attempt to use the user() function offline, which would result in an error.

a!localVariables(
  local!selectedUser,
  local!users: getdistinctusers(cons!ALL_USERS_GROUP),
  local!usersForDisplay: a!refreshVariable(
    value: a!forEach(
      items: local!users,
      expression: user(fv!item, "firstName") & " " & user(fv!item, "lastName")
    ),
/* If this is not set to false and 'local!users' is updated somewhere else in the interface, 'local!usersForDisplay' would attempt to use the user() function offline to update, resulting in an error */
    refreshOnReferencedVarChange: false
  ),
  a!dropdownField(
    label: "User",
    placeholder: "--- Choose User ---",
    choiceLabels: local!usersForDisplay,
    choiceValues: local!users,
    value: local!selectedUser,
    saveInto: local!selectedUser
  )
)Copy

a!localVariables(
  local!selectedUser,
  local!users: getdistinctusers(cons!ALL_USERS_GROUP),
/* a!refreshVariable() isn't used here which means an error will result if local!users is updated somewhere else in the interface */
  local!usersForDisplay: a!forEach(
    items: local!users,
    expression: user(fv!item, "firstName") & " " & user(fv!item, "lastName")
  ),
  a!dropdownField(
    label: "User",
    placeholder: "--- Choose User ---",
    choiceLabels: local!usersForDisplay,
    choiceValues: local!users,
    value: local!selectedUser,
    saveInto: local!selectedUser
  )
)Copy

Working with partially compatible functions in child interfaces and expression rules

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It's common to nest child interfaces and expression rules within a parent interface. However, if these children use a partially compatible function, you need to get the value of the function in the parent interface.

For child expression rules, you can simply put the expression rule in a local variable at the top of the parent interface. However, this won't work for child interfaces since you should avoid loading interfaces in local variables. Instead, you will need to pass the value of the partially compatible function from the parent to the child interface.

For child expression rules, load the expression rule at the top of the parent interface

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Guideline

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In an offline interface, when you reference an expression rule that uses a partially compatible function, put the expression rule in a local variable at the top of the parent interface.

Importance

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Partially compatible functions can only be evaluated during an offline data sync, which evaluates only the parent interface. In order to use a partially compatible function in a child expression rule, you need to get the value for the expression rule during this data sync. If you try to use the expression rule elsewhere in the parent interface, the interface will error in Appian Mobile.

Example

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In the following example, we are using a partially compatible function, loggedInUser(), in an expression rule. We are calling the expression rule in a local variable at the top of the parent interface. This ensures that the value for the partially compatible function is saved during an offline data sync.

a!localVariables(
/* Call the expression rule in a local variable
at the top of the interface */
!  local!firstName: rule!childRule(),
  {
    a!richTextDisplayField(
      labelPosition: "COLLAPSED",
      value: a!richTextItem(
/* Reference the value of the expression rule 
using a local variable */
!        text: local!firstName
      )
    )
  }
)Copy

user(
  username: loggedInUser(),
  property: "firstName"
)Copy

{
  /*... other components ...*/
  a!richTextDisplayField(
    labelPosition: "COLLAPSED",
    value: {
/* Calling the expression rule elsewhere in 
the interface will result in an error */
      a!richTextItem(text: rule!childRule())
    }
  )
  /*... other components ...*/
}Copy

user(
  username: loggedInUser(),
  property: "firstName"
)Copy

For child interfaces, pass the value of partially compatible functions from the parent to the child interface

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Guideline

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In an offline interface, when you use child interface that contains partially compatible function, put the partially compatible function in a local variable at the top of the parent parent interface. Then pass the value of the function to the child interface using a rule input.

Importance

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Partially compatible functions can only be evaluated during an offline data sync, which evaluates only the parent interface. In order to use a partially compatible function in a child interface, you need to get the value for the function during this data sync. If you try to use a partially compatible function directly in the child interface, it will cause an error in Appian Mobile.

Example

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In the following example, we get the value of the partially compatible function in a local variable at the top of the parent interface. We then use that variable for the text parameter value in the child interface.

In the child interface, we use a rule input for the text parameter. This ensures that the value for the partially compatible function can be saved during an offline data sync.

a!localVariables(
!  local!firstName: user(
    username: loggedInUser(),
    property: "firstName"
  ),
  {
    /*... other components ...*/
    rule!childInterface(
/* Pass in partially compatible function 
to child interface using rule inputs */
!      firstName: local!firstName
    )
    /*... other components ...*/
  }
)Copy

{
  a!richTextDisplayField(
    labelPosition: "COLLAPSED",
    value: {
      a!richTextItem(
/* Use a rule input for the value that the 
partially compatible function returns */
!        text: ri!firstName
      )
    }
  )
}Copy

{
  /*... other components ...*/
  rule!childInterface(),
  /*... other components ...*/
}Copy

{
  a!richTextDisplayField(
    labelPosition: "COLLAPSED",
    value: {
      a!richTextItem(
/* Using the partially compatible function 
in the child rule will result in an error */
        text: user(
          username: loggedInUser(),
          property: "firstName"
        )
      )
    }
  )
}Copy

Avoiding incompatible capabilities

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Don't use incompatible functions and components

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Guideline

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Do not use incompatible functions or components in an offline interface. For more information about determining compatibility, see Determining function and component compatibility.

Importance

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While many functions and components work offline, there are some that won't due to their nature. Certain functions and interface components only work if they are connected to the server. Therefore, they cannot be used for offline interfaces.

Example

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In the following example, we use the dropdown component instead of the user picker component since the user picker isn't compatible with offline mobile.

a!localVariables(
  local!user,
/* Make sure to get all of your possible users using a local variable on the initial interface load */
!  local!allUsers: getdistinctusers(cons!ALL_USERS_GROUP),
  {
/* Instead of a picker, use a dropdown field to select users */
!    a!dropdownField(
      label: "Users",
      placeholder: "--- Select a user ---",
      choiceLabels: local!allUsers,
      choiceValues: local!allUsers,
      value: local!user,
      saveInto: local!user
    )
  }
)Copy

a!localVariables(
  local!user,
  {
/* A picker field won't work in an offline interface because it requires a connection to the server in order to get the list of users */
!    a!pickerFieldUsers(
      label: "User Picker",
      labelPosition: "ABOVE",
      value: local!user,
      saveInto: local!user
    )
  }
)Copy

Don't use plug-ins

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Guideline

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Do not use plug-ins in an offline interface. This includes function, smart service, and component plug-ins.

Importance

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Plug-ins are not compatible with offline interfaces and will cause the interface to error when accessed on Appian Mobile.

Working with documents

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You can download documents in offline interfaces. Whether you want to include an image for a stylized billboard or bring in reference documents specific to user tasks, you can include any document in offline interfaces that your users can download.

To download documents offline, simply save your document as a document data type or as a document or folder data type. Then, use a document download link to call the document using one of the following methods:

• Using a constant.
• Casting document IDs using a query.
• Casting document IDs using a local variable.

For all three methods, you'll need to do all your calling, querying, and casting in local variables at the top of the interface.

Downloading documents using constants or functions

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In some of your offline interfaces, you may want to include a document that won't regularly change. These could be an image to show in a billboard, a document with additional details and instructions, or any document that won't change from user to user.

There are two methods that you can use to download these kinds of documents:

• Using a constant
• Using the todocument() function

Download documents using a constant

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When building offline interfaces, using a constant is the easiest and recommended method for calling in a document that won't regularly change. Simply create a constant that calls your document and use it in a local variable at the top of your interface.

Example: Downloading documents offline using a constant

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a!localVariables(
  local!document: cons!myDocument,
  {
    a!imageField(
      images: {
        a!documentImage(
          document: local!document
        )
      }
    )
  }
)Copy

{
  a!imageField(
    images: {
      a!documentImage(
        document: cons!myDocument
      )
    }
  )
}Copy

Download documents using the todocument function

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If the document that you want to include in your offline interface is saved as a document ID of type integer, you need to cast it to a document type.

To cast the integer to a document within the interface, use the todocument() function within a local variable at the top of the interface. If you use it farther down in the expression, the interface will attempt to return the document while offline and will not be able to retrieve it.

Example: Casting document id to document type using todocument()

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a!localVariables(
  local!document: todocument(150),
  {
    a!imageField(
      images: {
        a!documentImage(
          document: local!document
        )
      }
    )
  }
)Copy

{
  a!imageField(
    images: {
      a!documentImage(
        document: 150
      )
    }
  )
}Copy

Downloading documents offline using a query

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In some of your offline interfaces, you may need to include documents that will change based on the user's needs. These could be reference images specific to an inspection or previously submitted photos for equipment comparison.

These documents are typically stored in a database and you can access them using a!queryRecordType().

Make sure that the document you want to include is stored as a document data type or as a document or folder data type. If your document is saved as any other data type, you must cast it to a document data type or a document or folder data type so that you can download it. You can do this within local variables at the top of your interface.

Working with CDTs

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More often than not, you'll want to use record types to work with data in your offline interfaces and expressions. However, if you are already using CDTs in your application, consider the following best practices for working with CDTs.

To write data using CDTs, create CDTs that include only the fields you are writing

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Guideline

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If you using CDTs to write data, create a CDT that only includes the fields that you are updating. Use this CDT to write only the updated fields to the data store.

Importance

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When you write a CDT to a database, all of the fields in the database get updated, whether you entered a value or not. This means that if you're trying to only update the first name in a database using a Customer CDT, if you don't set the values for all of the other fields, you could overwrite all of the other fields with null.

Example

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For example, imagine you have an offline interface that queries for the following fields at the top of the interface.

• Customer id
• Customer name
• Customer address

In the interface, you allow the user to update the customer's address, but no other fields. To write this information to the data store, you need to create a CDT with only the id and the address fields. If you were to write to the data store using the original CDT, when you write the new address, you would update all of the other fields to null.

Avoiding pending offline forms submission failures

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In some cases, offline forms for site actions and tasks that are in the Pending Forms list may fail to submit after users regain connectivity. The following sections outline guidelines to follow to avoid these issues.

Be careful when modifying CDTs

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If your offline interface uses a type constructor to reference or save data to a CDT, be cautious when making changes to the CDT structure.

Adding new fields is backward-compatible and will not cause issues with pending forms.

However, the following changes can break compatibility with older versions of the CDT. This may prevent pending forms from being submitted, requiring users to fill out the form again.

CDT changes to avoid:

• Deleting fields.
• Changing a field's name.
• Changing a fields data type.

To avoid submission failures:

• Only add fields to CDTs.
• If you need to delete or rename a field, or change a field's data type, create a new CDT instead of modifying an existing one.
• Avoid using type constructors in offline interfaces. Instead, use a map and save it to a rule input of the CDT type.

Don't make changes to process calendars when users are working offline

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If you're using a custom process calendar, avoid making changes to the calendar while users are filling out offline forms. It could cause pending form submission failures. Instead, schedule these changes during off-hours.

Make sure users have the correct folder permissions to upload files

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If offline users attempt to upload a file to a folder that they don't have permission to access, the form will fail to submit. The offline form cannot check that the user has permission to access the folder until the user is back online, so the user won't see an error when they complete the form.

To prevent this, make sure that all users have the necessary permission to upload documents to the target folder.

Providing a better user experience

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To allow users to submit forms automatically when their session has timed out, enable remember me

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If a user is offline for longer than the idle session timeout period and remember me is not enabled, pending forms will not be submitted until after the user manually signs in again. To allow pending forms to be submitted automatically when the user is back online, enable remember me.

Remember me is configured in the Admin Console. See Appian authentication or SAML authentication depending on the authentication that your environment uses.

Determining function and component compatibility

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Because offline-enabled interfaces don't communicate with the server the same way that other interfaces do, certain functions and components that rely on a connection to the server work differently in offline interface.

Functions and components can be either compatible, partially compatible, or incompatible with offline mobile.

• Compatible: Works anywhere in an offline mobile interface.
• Partially compatible: Works with offline mobile if it is loaded at the top of the interface in a local variable.
• Incompatible: Doesn't work in offline mobile because it requires a connection to the server.

There are two main ways to determine whether a function or component is compatible with offline mobile: the Appian All Functions table in the docs and Appian design guidance in an interface or expression rule.

Using the Appian Functions table to determine compatibility

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To find out if a function is compatible with offline mobile using the filters on the Appian All Functions table:

1. Go to the All Functions page.
2. Change the Any Compatibility dropdown list to Incompatible, Partially Compatible, or Incompatible.
3. For the next dropdown list, choose Offline Mobile.
4. To view the offline compatibility in the table, toggle on the Compatibility column.

Using design guidance to determine compatibility

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A design guidance recommendation will display if you try to use an incompatible or partially compatible function in:

• Offline-enabled interfaces.
• Interfaces or expression rules that are referenced in an offline-enabled interface.

If you see this design guidance:

• For incompatible functions or components, refactor your expression to remove them.
• For partially compatible functions, use them in a local variable at the top of the parent interface.

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