jsf - How to do the value binding in datatable when selection mode = multiple -

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I need explanation for the bond values ​​in the output text below P: Dialog. I am not clear from that and no other way.

In my sample: I have tried, if I select single or multiple check boxes, the value is tied, but when I click on the root check box, to select all the check boxes It is used for selection, but the values ​​are not stored at the back end 

   & Lt; P: column headerText = "id" & gt; & Lt; H: output text value = "# {car.id}" /> & Lt; / P: column & gt; & Lt; P: column header = "year" & gt; & Lt; H: output text value = "# {car.year}" /> & Lt; / P: column & gt; & Lt; P: column header = "brand" & gt; & Lt; H: output text value = "# {car.brand}" /> & Lt; / P: column & gt; & Lt; P: column header = 'color' & gt; & Lt; H: output text value = "# {car.color}" /> & Lt; / P: column & gt; & Lt; F: aspect names = "footer" & gt; & Lt; P: Command Button Process = "Checkbox DT" update = ": Form: Multicard" icon = "UI-icon-search" value = "see" incomplete = "PF ('multicardiol'). Show ()" /> & Lt ; / Ch: Aspect & gt; & Lt; / P: DataTable & gt; & Lt; P: Dialog header = "Selected cars" widgetVR = "multicardialog" modal = "true" show effect = "fade" hidden effect = "fade" size = "wrong" width = "200" & gt; & Lt; P: OutputPanel ID = "Multicart" style = "text-align: center;" & Gt; & Lt; Ui: Recurrence value = "# {dt SelectionView.selectedCars}" var = "car" & gt; & Lt; H: output text value = "# {car.id} - # {car.brand}" style = "display: block" /> & Lt; / Ui: Repeat & gt; & Lt; / P: outputPanel & gt; & Lt; / P: Dialog & gt;          
 
 
 You should update the checkbox DT because updates are used to determine the components ID (refresh with the values ​​updated from the server) if you If the checkboxes do not update, the selected cards do not even update  
 
 
 
 
 
 
 
 
 
 
 
  
 MultiCarDialog '). Show () "/>

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