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Forcing components in CSSLayout to occupy there own space.

dharmendra prasad
9 years ago Jun 13, 2013 5:41am
Kim Leppänen
9 years ago Jun 13, 2013 6:17am

With Vaadin 7, if you set a component's visibility to false, then the component's information is not sent to the browser at all - it is just as if the component wouldn't exist in the layout at all.

I can quickly come up with two solutions. If you know the size of the component whose visibility you want to toggle, then you can use placeholder components - such as a Label. Put a label with the correct size in the place where you want the component. When you want to set a component as visible, then replace the label with the actual component.

The second option is to use css. Apply the css attribute "visibility: hidden" for the component you want to hide. Note that the component is not "truly" hidden. Let's say that it is a button. A user could still inspect the DOM tree and see the button in the code, change the visibility of the component on the client side (eg using developer tools or firebug) and then see and use the button as if it would be visible in the layout.

dharmendra prasad
9 years ago Jun 13, 2013 7:14am