JavaFx: How to apply validation on two GridPanes nodes simultaneously?

问题

I'm creating an application using Javafx in which in which I'm creating two different GridPanes say GridPane A and GridPane B. In GridPane A I've TextFields and GridPane B I've TextFields, Checkboxes and DatePickers, all the nodes I'm creating at run time. Under both of the GridPanes A and B I've a button like this:

What I want is to disable the button until both the entries of both GridPane A and GridPane B. I'm able on achieve it but only on GridPane A like this

First by checking if all the TextFields of GridPane A are filled and not empty:

private static boolean isAllFilled(GridPane tableA){
     for(Node node : tableA.getChildren()){ // cycle through every component in the table (GridPane)
         if(node instanceof TextField){ // if it's a TextField
         // after removing the leading spaces, check if it's empty
             if(((TextField)node).getText().trim().isEmpty()){
                     return false; // if so, return false
             }
         }       
     }
     return true;
  }

Then validating the TableA (GridPane A) and adding listener:

private void validateTable(GridPane tableA, Button button) {

     for(Node node : tableA.getChildren()){ // cycle through every component in the table (GridPane)
        if(node instanceof TextField){ // if it's a TextField
          ((TextField)node).textProperty().addListener((obs, old, newV)->{ // add a change listener to every TextField
          // then check if the new value is not empty AND all other TextFields are not empty
            if(!newV.trim().isEmpty()&&isAllFilled(tableA)){ 
               button.setDisable(false); // then make the button active again
            }
            else{
                button.setDisable(true); // or else, make it disable until it achieves the required condition 
            }
        });
     }    
  }

  }

I want to apply validation simultaneously on both GridPane A and GridPane B, like right now my program is validating GridPane A entries and disabling/enabling the button but I want is to keep button disabled unless both GridPane A and GridPane B entries are filled.

回答1:

The same way you're checking if all TextFields are Filled in Table A, You can do the same for the second Table (Table B):

// cycle through every component in tableA
private static boolean isAllFilled(GridPane tableA, GridPane tableB){
    for(Node node : tableA.getChildren()){
        if(node instanceof TextField){
            if(((TextField)node).getText().trim().isEmpty()){
                    return false;
            }
        }       
    }

     // cycle through every component in tableB
    for(Node node : tableB.getChildren()){ 
        if(node instanceof TextField){
            if(((TextField)node).getText().trim().isEmpty()){
                    return false;
            }
        }       
    }

    return true; // if all are filled / not empty
}

Now with every change in any TextField either in TableA or TableB, it will check if all TextFields in both tables are Filled.

---

Then Add tableB to the validateTable method, like this:

private void validateTable(GridPane tableA, GridPane tableB, Button button){

    // add a change listener to every TextField in tableA
     for(Node node : tableA.getChildren()){ 
        if(node instanceof TextField){
          ((TextField)node).textProperty().addListener((obs, old, newV)->{ 
            if(!newV.trim().isEmpty()&&isAllFilled(tableA, tableB)){ 
               button.setDisable(false);
            }
            else{
                button.setDisable(true);
            }
         });
      }    
   }

   // add a change listener to every TextField in tableB
     for(Node node : tableB.getChildren()){ 
        if(node instanceof TextField){
          ((TextField)node).textProperty().addListener((obs, old, newV)->{ 
            if(!newV.trim().isEmpty()&&isAllFilled(tableA, tableB)){ 
               button.setDisable(false);
            }
            else{
                button.setDisable(true);
            }
         });
       }    
    }
}

来源：https://stackoverflow.com/questions/44294321/javafx-how-to-apply-validation-on-two-gridpanes-nodes-simultaneously