How to generate 'required' Attribute in GWT using UIBinder?

Question

Expected HTML

<input class="sth" type="input" required/>

How to generate this using UIBinder in GWT? I am using following and not generating the required attribute

<g:TextBox ui:field="username"/>

Answer 1

You cannot do it in UiBinder with standard TextBox widget. If this is a one-off situation, set it in code. If this is something that you use often, create your own widget by extending TextBox and adding:

public void setRequired(boolean isRequired) {
    if (isRequired) {
        getElement().setAttribute("required", "required");
    }
}

Then you can use it in UiBinder:

<w:MyTextBox ui:field="username" required="true"/>

where w links to your widgets folder.