I defined local!valuelist from a!localVariables, however, it is not a list so i can't saveinto form such as local!valuelist.username,local!valuelist.password, how can i transfer the format of this local value?
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In addition, all you need to do to define your local variable as a list is utilize {} in it's definition. Here's an example of saving into index 2 of an empty local!valuelist variable:
a!localVariables( local!valuelist: {}, { a!richTextDisplayField( label: "List:", value: a!forEach( items: local!valuelist, expression: { a!richTextItem( text: concat("Item ",fv!index,": ",fv!item) ), char(13) } ) ), a!buttonArrayLayout( align: "START", buttons: { a!buttonWidget( label: "Save", value: "B", saveInto: a!save(local!valuelist[2],{username: save!value}) ) } ) } )