Palette does not render arrows since Wicket 7.x.x

问题

See this minimal demo at GitHub: https://github.com/ErikVerheul/PaletteBugDemo.git

I expected that the code line palette.add(new DefaultTheme()); would do the trick. However, it did not.

When changing the Wicket version to 6.20.0 all works fine.

Did I miss something?

help appreciated, Erik

回答1:

Short answer: Remove your paragraph <p> and use a <div> instead of the <span> for the palette.

Long answer

The p paragraph cannot contain other block elements. In Wicket 6.x the palette uses a table to layout the "Available" und "Selected" options. In Wicket 7.x divs are used for that, since tables only should be used for tabular data and not for layouting. Neither tables nor divs are allowed in a paragraph though. I guess browsers are just a bit more forgiving when using tables at wrong places, hence you are seeing a somewhat correct result with version 6.x.

Another problem is that you are using a span tag for your palette. Again, the palette is inserting either a table or several div tags, but neither of these are valid in between the span tag.

So something like this should do it:

<form>
  <div class="mystyle">
    <div wicket:id="palette"></div>
  </div>
  ...
</form>

回答2:

Problem SOLVED. Thank you Martin! As a Wicket novice I used a version 6 example not knowing the changes in version 7. The working version is now on GitHub.

回答3:

It does work fine here: http://examples7-apachewicket.rhcloud.com/compref/wicket/bookmarkable/org.apache.wicket.examples.compref.PalettePage

Please check what is different in your app.

来源：https://stackoverflow.com/questions/33740642/palette-does-not-render-arrows-since-wicket-7-x-x