Expression binding to a sub-collection in a collection

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  • Patrick
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      1 year ago #38073

      Hi,

      we created a collection with some parameters (strings, integers, etc.). One of these parameters is also a collection itself, meaning a sub-collection of that collection. For a TabContainer, we’ve set the binding to the collection (green text in screenshot).

      But how to set a binding to the sub-collection that is inside such a collection (red text in screenshot)?

      The sub-collection should contain its own objects.

      regards

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      Jennifer Häfner
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        1 year ago #38076
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        Hi Patrick,

        For nested binding, you have to use a manual binding in the inner binding. So here are the steps:

        • For the outer binding (in your case, the tabs), you can use the data source feature to configure the source of your binding (e.g., business object or global variable)
        • For the inner binding (in your case, the list inside a tab), you have to use a manual binding:
        • Click on the list and search for ‘items’. Next to the property ‘itemsPath’, click on the binding icon and select ‘Manual’. Then, enter the binding in the form ‘Screenname>SubCollectionName’ (without any brackets, as this is a string value). Set the property ‘itemsTemplate’ to true
        • For the widgets inside the list items, you also have to use a manual binding: Click on the binding icon next to the property that you want to bind. Select ‘Manual’. Then, enter the binding in the form ‘{Screenname>SubCollectionPropertyName}’
        • If you are using a global variable as the data source, use ‘variableHolder’ instead of the screen name in the manual binding

        Let me know if you have any further questions.

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        Patrick
            Has successfully completed the online course Introduction
          1 year ago #38147
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          Hi Jennifer, now it works, thank you!

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