如何在textarea的onkeyup上更改标签的文字?我试过这个但是没有用:
Form form;
TextArea ta;
MyLabel resultDiv;
/**
* Constructor that is invoked when page is invoked without a session.
*/
public HomePage(final PageParameters parameters) {
this.form = new Form("form");
this.ta = new TextArea("text");
this.resultDiv = new MyLabel("result");
this.ta.add( new AjaxEventBehavior( "onKeyUp" ) {
protected void onEvent( AjaxRequestTarget target ) {
System.out.println( "Ajax!" );
resultDiv.setText("Foobar");
resultDiv.renderComponent();
}
} );
form.add( ta );
form.add( resultDiv );
add( form );
}// const
public class MyLabel extends Label {
private String text = "original";
public String getText() { return text; }
public void setText( String text ) { this.text = text; }
public MyLabel( String id ) {
super( id );
this.setModel( new PropertyModel(this,"text") );
}
}
解决方案
leonidv 几乎就在那里。生成的代码是:
Form form;
TextArea ta;
Label resultDiv = new Label( "result", new PropertyModel(this,"labelText") ){
{ setOutputMarkupId( true ); }
};
private String labelText = "original";
/**
* Constructor that is invoked when page is invoked without a session.
*/
public HomePage(final PageParameters parameters) {
this.form = new Form("form");
this.ta = new TextArea("text");
this.ta.add( new AjaxEventBehavior( "onKeyUp" ) {
protected void onEvent( AjaxRequestTarget target ) {
System.out.println( "Ajax!" );
labelText = "Foobar"; // Doesn't even need get/set, which is great.
target.addComponent( resultDiv );
//resultDiv.renderComponent(); // WRONG!!
}
} );
form.add( ta );
form.add( resultDiv );
add( form );
}// const
最后一个问题是我对添加renderComponent()
的不良直觉 - 由于某种原因,保持标签不变。
顺便说一句,结果将很快用作JTexy lightweight markup language沙箱。
感谢您的帮助!
答案 0 :(得分:4)
如果要在AJAX事件之后更新组件,则必须执行以下两项操作:
setOutputMarkupId == true;
您必须将此组件添加到目标onEvent方法
this.resultDiv.setMarkupOutputId(true);
protected void onEvent( AjaxRequestTarget target ) {
System.out.println( "Ajax!" );
//resultDiv.setModel( );
resultDiv.setText("Foobar");
resultDiv.renderComponent();
target.add(resultDiv);
}
PS我不了解你代码的很多部分。
答案 1 :(得分:0)
而不是resultDiv.renderComponent(); 尝试resultDiv.modelChanged();