Question

I want to change the color of a g:label using java code on a onBlur event.
I am using eclipse, UIBinder.

This is what I have in mind although it doesn’t work.

In my StandardDocumentDownload.ui.xml file

<ui:style>     
   .testStyle {
   }
   .styleRequiredData
   {
        color:red;

    }
 </ui:style>

this is the event in my standardDocumentDownload.java file

@UiHandler("comboTitle")
void onComboTitleBlur(BlurEvent event) {
    int title = comboTitle.getSelectedIndex();

    if(title == 0)
    {
        labTitleReq.setText("Please enter a value");
        labTitle.addStyleName("styleRequiredData");
    }
    else
    {
        labTitleReq.setText("");
    }

}

How could I add the color red to the existing style of the label upon the firing of the event.

Kind regards

Answer 1

See here under Programmatic access to inline Styles

for you, it shoulbe be something like :

<ui:style type="com.yourapp.YourClass.MyStyle">     
    .testStyle {
    }
    .styleRequiredData
    {
        color:red;
    }
</ui:style>

public class YourClass extends Widget {
    interface MyStyle extends CssResource {
        String testStyle();
        String styleRequiredData();
    }

    @UiField MyStyle style;

    /* ... */

    @UiHandler("comboTitle")
    void onComboTitleBlur(BlurEvent event) {
        int title = comboTitle.getSelectedIndex();
        if(title == 0){
            labTitleReq.setText("Please enter a value");
            labTitle.getElement().addClassName(style.styleRequiredData);
        } else {
            labTitleReq.setText("");
        }
    }
}