Question

I am getting an error when I try to wrap a submit button with GWT:

Caused by: java.lang.AssertionError: Child cannot be null
    at com.google.gwt.dom.client.Node$.isOrHasChild$(Node.java:278)
    at com.google.gwt.user.client.ui.Button.wrap(Button.java:55)

HTML Code:

<div style="display:none">
    <form id="login_form" action="javascript:;">
        <input id="username" type="text">
        <input id="password" type="password">
        <button type="button" id="submit" name="submit" value="Submit">
    </form> 
</div>

Java Code (GWT):

loginButton = Button.wrap(Document.get().getElementById("submit"));

Is there any way to wrap a submit button?

Answer 1

It does not work because your form is not connected to the DOM-Tree. Remove display:none from the surrounding <div /> and it should work.