object-repeat

Version Compatibility
object-repeat was introduced in version 4.21.0 of the JourneyApps Container.
Alpha Feature
object-repeat is currently in alpha status. There are some known issues:
Performance is slow, especially when used with OnlineDB.
Nesting object-repeat inside another object-repeat does not work as expected.
It is not possible to use an advanced query inside a nested object-table or object-list (e.g. sorting, or anything other than a direct has-many relationship on the object).
Issues that have been fixed:
The data inside the object-repeat does not always reload properly when changed (e.g. after a sync). This was fixed in version 4.27 of the JourneyApps Container.
Syntax
<object-repeat query="myquery" as="item">
    <card>
        <content>{item.message}</content>
    </card>
    <button label="Read" on-press="$:item.read = true" />
</object-repeat>
Attribute
Description
query
The collection to loop over.
(The same as, e.g., object-table)
A view variable of type query: or array:
as
variable name to be used for the repeating object
Scoping
object-repeat creates a new “virtual scope” used for nested components. This specifically includes the current object, under the name specified in the as attribute. This is relevant for:
1.Shorthand expressions.
2.Parameters passed to JS functions.
Nesting
Most components are allowed to be nested, with some specific exceptions:
columns/column
sidebar
Please note:
Nested object-repeat s are allowed, but do not currently function correctly.
More detailed example
<view>
  <var name="mytext" type="text" />
  <var name="myquery" type="query:item" />
  <object-repeat query="myquery" as="item">
    <card>
      <!-- View variables can be referenced in shorthand expressions,
      as well as `item`. -->
      <heading>{mytext}: {item.title}</heading>
      <content>{item.message}</content>
      <action on-press="myfunction(mytext, item)" />
    </card>
    <!-- `item` can be used in JS expressions. However, view variables need view. -->
    <button label="Read" on-press="$:myfunction(view.mytext, item)" />
  </object-repeat>
</view>
Performance notes
Due to its complexity, object-repeat does not offer the same performance and speed than object-list and object-table. Therefore, it is recommended to keep the number of objects in your collection < 20, and never more than around 50.
object-repeat is currently very slow when used with OnlineDB - the user will see items loading one by one. As a workaround, always use object-repeat with an array and not a query when using OnlineDB.

Attribute	Description
`query`	The collection to loop over. (The same as, e.g., `object-table`) A view variable of type `query:` or `array:`
`as`	variable name to be used for the repeating object

action

object-table

Last modified 1yr ago