CODEWITHSUNDEEP
javawicket
LDropl
LDropl

Reputation: 934

Show button if input text field is not empty in Wicket

There is input text field and submit button. I would like to show button text field not empty and otherwise button should be not visible.

            TextArea<String> textMessageField = new TextArea<>("textMessage", textMessageModel);
            Button submitBtn = new Button("saveReminderButton") {
                @Override
                protected void onConfigure() {
                    super.onConfigure();
                    String text = textMessageField.getModelObject();
                    setVisible(text != null && !text.isEmpty());
                }
            };

            textMessageField.add(new OnChangeAjaxBehavior() {
                @Override
                protected void onUpdate(AjaxRequestTarget target) {
                    target.add(submitBtn);
                }
            });
            submitBtn.setOutputMarkupId(true);

I'm trying to use setVisible method in onConfigure but it doesnt work. I tried to use instead setEnabled and it was working but I need the same functionality with hide/show button

Upvotes: 0

Views: 186

Answers (1)

martin-g
martin-g

Reputation: 17503

Since you make the button invisible you need to use submitBtn.setOutputMarkupPlaceholderTag(true); instead of submitBtn.setOutputMarkupId(true);

This is important because without setOutputMarkupPlaceholderTag(true) Wicket Wicket will render nothing for this component. With setOutputMarkupPlaceholderTag(true) it will render <htmlElement id="someId"></htmlElement>. This way Wicket Ajax could find it in the DOM and replace it with the HTML of the visible one.

Upvotes: 3

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