java - Validating User Input using JavaFX and FXML -
using javafx , fxml want validate users' input when hit submit. looking @ .fxml doc, you'll see have 2 input fields 1 zip code , 1 cityname. enforcing numbertextfield.java , citynametextfield.java xml file, how can make sure 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 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 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 controller's initialize method, do
btn.disableproperty().bind(zipcodetf.textproperty().isempty() .or(citynametf.textproperty().isempty())); you can directly in fxml file with
<button fx:id="btn" text="submit" disable="${ citynametf.text.empty || zipcodetf.text.empty }"/>
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