Using JavaFX and FXML I want to validate users' input when they hit submit. looking at the .fxml doc, you'll see that I have 2 input fields one for zip code and one for cityname. I am enforcing NumberTextField.java and CityNameTextField.java from the xml file, but how can I make sure they are not blank when user hit submit?
FXMLDocument.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import validatetextfieldsfxml.custom.*?>
<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children>
<Label layoutX="173.0" layoutY="89.0" text="ZipCode" />
<Label layoutX="173.0" layoutY="118.0" text="CityName" />
<NumberTextField fx:id="zipCodeTf" layoutX="257.0" layoutY="84.0" />
<CityNameTextField fx:id="cityNameTf" layoutX="257.0" layoutY="113.0" />
<Button fx:id="btn" layoutX="217.0" layoutY="162.0" mnemonicParsing="false" text="Submit" />
</children>
</Pane>
CityNameTextField.java
package validatetextfieldsfxml.custom;
import javafx.scene.control.TextField;
public class CityNameTextField extends TextField {
public CityNameTextField(){
this.setPromptText("Enter Your CityName");
}
@Override
public void replaceText(int i, int il, String string){
if(string.matches("[a-zA-Z]") || string.isEmpty()){
super.replaceText(il, il, string);
}
}
@Override
public void replaceSelection(String string) {
super.replaceSelection(string);
}
}
NumberTextField.java
package validatetextfieldsfxml.custom;
import javafx.scene.control.TextField;
public class NumberTextField extends TextField{
public NumberTextField(){
this.setPromptText("Enter Only numbers");
}
@Override
public void replaceText(int i, int il, String string){
if(string.matches("[0-9]") || string.isEmpty() ){
super.replaceText(i, il, string);
}
}
@Override
public void replaceSelection(String string){
super.replaceSelection(string);
}
}
In your controller's
initialize
method, just doYou can also do this directly in the FXML file with