[Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

Thanks for that. I also found a tutorial by Nathan Woodrow which 
explains how to do custom functions.

https://woostuff.wordpress.com/2015/05/21/accessing-composer-item-properties-via-custom-expressions-in-qgis/

On 5/08/21 12:51 am, Stefan Giese (WhereGroup) wrote:
>
> here is a function which does the job. It's a bit more generic, you 
> have to pass the layoutname and the itemID to get the text:
>
> /from qgis.core import *//
> //from qgis.gui import *//
> //
> //@qgsfunction(args='auto', group='Custom')//
> //def get_layout_textitem(layoutTitle, itemId, feature, parent)://
> //    """//
> //    Gets the text from a labelitem in the layout with the name 
> layoutTitle.//
> //    <h2>Example usage:</h2>//
> //    <ul>//
> //      <li>get_layout_textitem('Layout 1', 'text1') -> 'lorem 
> ipsum</li>//
> //    </ul>//
> //    """//
> //
> //    project = QgsProject.instance()//
> //    projectLayoutManager = project.layoutManager()//
> //    layout = projectLayoutManager.layoutByName(layoutTitle)//
> //
> //    fileNameLabel = layout.itemById(itemId)//
> //    fileNameText = fileNameLabel.text() //
> //    return fileNameText/
>
> //
>
> Am 04.08.2021 um 14:06 schrieb Patrick Dunford:
>> layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"
>>
>> project = QgsProject.instance()
>> projectLayoutManager = project.layoutManager()
>> layout = projectLayoutManager.layoutByName(layoutTitle)
>>
>> fileNameLabel = layout.itemById('Filename')
>> fileNameText = fileNameLabel.text() 
> -- 
> Mit freundlichen Grüßen
> Stefan Giese
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